diff --git a/msvc/projects/vc2015/test_threads/test_threads.cpp b/msvc/projects/vc2015/test_threads/test_threads.cpp
index c8cb7d66..a3d1a792 100644
--- a/msvc/projects/vc2015/test_threads/test_threads.cpp
+++ b/msvc/projects/vc2015/test_threads/test_threads.cpp
@@ -21,7 +21,7 @@ int test_threads()
   je_malloc_conf = "narenas:3";
   int narenas = 0;
   size_t sz = sizeof(narenas);
-  je_mallctl("opt.narenas", &narenas, &sz, NULL, 0);
+  je_mallctl("opt.narenas", (void *)&narenas, &sz, NULL, 0);
   if (narenas != 3) {
     printf("Error: unexpected number of arenas: %d\n", narenas);
     return 1;
@@ -33,7 +33,7 @@ int test_threads()
   je_malloc_stats_print(NULL, NULL, NULL);
   size_t allocated1;
   size_t sz1 = sizeof(allocated1);
-  je_mallctl("stats.active", &allocated1, &sz1, NULL, 0);
+  je_mallctl("stats.active", (void *)&allocated1, &sz1, NULL, 0);
   printf("\nPress Enter to start threads...\n");
   getchar();
   printf("Starting %d threads x %d x %d iterations...\n", numThreads, numIter1, numIter2);
@@ -78,7 +78,7 @@ int test_threads()
   }
   je_malloc_stats_print(NULL, NULL, NULL);
   size_t allocated2;
-  je_mallctl("stats.active", &allocated2, &sz1, NULL, 0);
+  je_mallctl("stats.active", (void *)&allocated2, &sz1, NULL, 0);
   size_t leaked = allocated2 - allocated1;
   printf("\nDone. Leaked: %zd bytes\n", leaked);
   bool failed = leaked > 65536; // in case C++ runtime allocated something (e.g. iostream locale or facet)
diff --git a/src/stats.c b/src/stats.c
index ca716d5e..689299fa 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -3,7 +3,7 @@
 
 #define	CTL_GET(n, v, t) do {						\
 	size_t sz = sizeof(t);						\
-	xmallctl(n, v, &sz, NULL, 0);					\
+	xmallctl(n, (void *)v, &sz, NULL, 0);				\
 } while (0)
 
 #define	CTL_M2_GET(n, i, v, t) do {					\
@@ -12,7 +12,7 @@
 	size_t sz = sizeof(t);						\
 	xmallctlnametomib(n, mib, &miblen);				\
 	mib[2] = (i);							\
-	xmallctlbymib(mib, miblen, v, &sz, NULL, 0);			\
+	xmallctlbymib(mib, miblen, (void *)v, &sz, NULL, 0);		\
 } while (0)
 
 #define	CTL_M2_M4_GET(n, i, j, v, t) do {				\
@@ -22,7 +22,7 @@
 	xmallctlnametomib(n, mib, &miblen);				\
 	mib[2] = (i);							\
 	mib[4] = (j);							\
-	xmallctlbymib(mib, miblen, v, &sz, NULL, 0);			\
+	xmallctlbymib(mib, miblen, (void *)v, &sz, NULL, 0);		\
 } while (0)
 
 /******************************************************************************/
@@ -368,45 +368,51 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
 		    "config.malloc_conf: \"%s\"\n", config_malloc_conf);
 
 #define	OPT_WRITE_BOOL(n)						\
-		if (je_mallctl("opt."#n, &bv, &bsz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&bv, &bsz, NULL, 0) ==	\
+		    0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			    "  opt."#n": %s\n", bv ? "true" : "false");	\
 		}
 #define	OPT_WRITE_BOOL_MUTABLE(n, m) {					\
 		bool bv2;						\
-		if (je_mallctl("opt."#n, &bv, &bsz, NULL, 0) == 0 &&	\
-		    je_mallctl(#m, &bv2, &bsz, NULL, 0) == 0) {		\
+		if (je_mallctl("opt."#n, (void *)&bv, &bsz, NULL, 0) ==	\
+		    0 && je_mallctl(#m, &bv2, &bsz, NULL, 0) == 0) {	\
 			malloc_cprintf(write_cb, cbopaque,		\
 			    "  opt."#n": %s ("#m": %s)\n", bv ? "true"	\
 			    : "false", bv2 ? "true" : "false");		\
 		}							\
 }
 #define	OPT_WRITE_UNSIGNED(n)						\
-		if (je_mallctl("opt."#n, &uv, &usz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&uv, &usz, NULL, 0) ==	\
+		    0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			"  opt."#n": %u\n", uv);			\
 		}
 #define	OPT_WRITE_SIZE_T(n)						\
-		if (je_mallctl("opt."#n, &sv, &ssz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&sv, &ssz, NULL, 0) ==	\
+		    0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			"  opt."#n": %zu\n", sv);			\
 		}
 #define	OPT_WRITE_SSIZE_T(n)						\
-		if (je_mallctl("opt."#n, &ssv, &sssz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&ssv, &sssz, NULL, 0)	\
+		    == 0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			    "  opt."#n": %zd\n", ssv);			\
 		}
 #define	OPT_WRITE_SSIZE_T_MUTABLE(n, m) {				\
 		ssize_t ssv2;						\
-		if (je_mallctl("opt."#n, &ssv, &sssz, NULL, 0) == 0 &&	\
-		    je_mallctl(#m, &ssv2, &sssz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&ssv, &sssz, NULL, 0)	\
+		    == 0 && je_mallctl(#m, &ssv2, &sssz, NULL, 0) ==	\
+		    0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			    "  opt."#n": %zd ("#m": %zd)\n",		\
 			    ssv, ssv2);					\
 		}							\
 }
 #define	OPT_WRITE_CHAR_P(n)						\
-		if (je_mallctl("opt."#n, &cpv, &cpsz, NULL, 0) == 0) {	\
+		if (je_mallctl("opt."#n, (void *)&cpv, &cpsz, NULL, 0)	\
+		    == 0) {						\
 			malloc_cprintf(write_cb, cbopaque,		\
 			    "  opt."#n": \"%s\"\n", cpv);		\
 		}
@@ -462,11 +468,13 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
 		malloc_cprintf(write_cb, cbopaque,
 		    "Unused dirty page decay time: %zd%s\n", ssv, (ssv < 0) ?
 		    " (no decay)" : "");
-		if (je_mallctl("arenas.tcache_max", &sv, &ssz, NULL, 0) == 0) {
+		if (je_mallctl("arenas.tcache_max", (void *)&sv, &ssz, NULL, 0)
+		    == 0) {
 			malloc_cprintf(write_cb, cbopaque,
 			    "Maximum thread-cached size class: %zu\n", sv);
 		}
-		if (je_mallctl("opt.prof", &bv, &bsz, NULL, 0) == 0 && bv) {
+		if (je_mallctl("opt.prof", (void *)&bv, &bsz, NULL, 0) == 0 &&
+		    bv) {
 			CTL_GET("prof.lg_sample", &sv, size_t);
 			malloc_cprintf(write_cb, cbopaque,
 			    "Average profile sample interval: %"FMTu64
@@ -509,8 +517,8 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
 				unsigned i, ninitialized;
 
 				isz = sizeof(bool) * narenas;
-				xmallctl("arenas.initialized", initialized,
-				    &isz, NULL, 0);
+				xmallctl("arenas.initialized",
+				    (void *)initialized, &isz, NULL, 0);
 				for (i = ninitialized = 0; i < narenas; i++) {
 					if (initialized[i])
 						ninitialized++;
@@ -538,8 +546,8 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
 				unsigned i;
 
 				isz = sizeof(bool) * narenas;
-				xmallctl("arenas.initialized", initialized,
-				    &isz, NULL, 0);
+				xmallctl("arenas.initialized",
+				    (void *)initialized, &isz, NULL, 0);
 
 				for (i = 0; i < narenas; i++) {
 					if (initialized[i]) {
diff --git a/src/tcache.c b/src/tcache.c
index 98c18a04..7f5b291c 100644
--- a/src/tcache.c
+++ b/src/tcache.c
@@ -502,10 +502,10 @@ tcache_boot(tsdn_t *tsdn)
 	unsigned i;
 
 	/* If necessary, clamp opt_lg_tcache_max. */
-	if (opt_lg_tcache_max < 0 || (1U << opt_lg_tcache_max) < SMALL_MAXCLASS)
+	if (opt_lg_tcache_max < 0 || (ZU(1) << opt_lg_tcache_max) < SMALL_MAXCLASS)
 		tcache_maxclass = SMALL_MAXCLASS;
 	else
-		tcache_maxclass = (1U << opt_lg_tcache_max);
+		tcache_maxclass = (ZU(1) << opt_lg_tcache_max);
 
 	nhbins = size2index(tcache_maxclass) + 1;
 
diff --git a/src/util.c b/src/util.c
index a1c4a2a4..881a7fd1 100644
--- a/src/util.c
+++ b/src/util.c
@@ -200,7 +200,7 @@ malloc_strtoumax(const char *restrict nptr, char **restrict endptr, int base)
 		p++;
 	}
 	if (neg)
-		ret = -ret;
+		ret = (uintmax_t)(-((intmax_t)ret));
 
 	if (p == ns) {
 		/* No conversion performed. */
diff --git a/test/integration/MALLOCX_ARENA.c b/test/integration/MALLOCX_ARENA.c
index 30c203ae..910a096f 100644
--- a/test/integration/MALLOCX_ARENA.c
+++ b/test/integration/MALLOCX_ARENA.c
@@ -19,8 +19,8 @@ thd_start(void *arg)
 	size_t sz;
 
 	sz = sizeof(arena_ind);
-	assert_d_eq(mallctl("arenas.extend", &arena_ind, &sz, NULL, 0), 0,
-	    "Error in arenas.extend");
+	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz, NULL, 0),
+	    0, "Error in arenas.extend");
 
 	if (thread_ind % 4 != 3) {
 		size_t mib[3];
diff --git a/test/integration/allocated.c b/test/integration/allocated.c
index 3630e80c..6ce145b3 100644
--- a/test/integration/allocated.c
+++ b/test/integration/allocated.c
@@ -18,14 +18,14 @@ thd_start(void *arg)
 	size_t sz, usize;
 
 	sz = sizeof(a0);
-	if ((err = mallctl("thread.allocated", &a0, &sz, NULL, 0))) {
+	if ((err = mallctl("thread.allocated", (void *)&a0, &sz, NULL, 0))) {
 		if (err == ENOENT)
 			goto label_ENOENT;
 		test_fail("%s(): Error in mallctl(): %s", __func__,
 		    strerror(err));
 	}
 	sz = sizeof(ap0);
-	if ((err = mallctl("thread.allocatedp", &ap0, &sz, NULL, 0))) {
+	if ((err = mallctl("thread.allocatedp", (void *)&ap0, &sz, NULL, 0))) {
 		if (err == ENOENT)
 			goto label_ENOENT;
 		test_fail("%s(): Error in mallctl(): %s", __func__,
@@ -36,14 +36,15 @@ thd_start(void *arg)
 	    "storage");
 
 	sz = sizeof(d0);
-	if ((err = mallctl("thread.deallocated", &d0, &sz, NULL, 0))) {
+	if ((err = mallctl("thread.deallocated", (void *)&d0, &sz, NULL, 0))) {
 		if (err == ENOENT)
 			goto label_ENOENT;
 		test_fail("%s(): Error in mallctl(): %s", __func__,
 		    strerror(err));
 	}
 	sz = sizeof(dp0);
-	if ((err = mallctl("thread.deallocatedp", &dp0, &sz, NULL, 0))) {
+	if ((err = mallctl("thread.deallocatedp", (void *)&dp0, &sz, NULL,
+	    0))) {
 		if (err == ENOENT)
 			goto label_ENOENT;
 		test_fail("%s(): Error in mallctl(): %s", __func__,
@@ -57,9 +58,9 @@ thd_start(void *arg)
 	assert_ptr_not_null(p, "Unexpected malloc() error");
 
 	sz = sizeof(a1);
-	mallctl("thread.allocated", &a1, &sz, NULL, 0);
+	mallctl("thread.allocated", (void *)&a1, &sz, NULL, 0);
 	sz = sizeof(ap1);
-	mallctl("thread.allocatedp", &ap1, &sz, NULL, 0);
+	mallctl("thread.allocatedp", (void *)&ap1, &sz, NULL, 0);
 	assert_u64_eq(*ap1, a1,
 	    "Dereferenced \"thread.allocatedp\" value should equal "
 	    "\"thread.allocated\" value");
@@ -74,9 +75,9 @@ thd_start(void *arg)
 	free(p);
 
 	sz = sizeof(d1);
-	mallctl("thread.deallocated", &d1, &sz, NULL, 0);
+	mallctl("thread.deallocated", (void *)&d1, &sz, NULL, 0);
 	sz = sizeof(dp1);
-	mallctl("thread.deallocatedp", &dp1, &sz, NULL, 0);
+	mallctl("thread.deallocatedp", (void *)&dp1, &sz, NULL, 0);
 	assert_u64_eq(*dp1, d1,
 	    "Dereferenced \"thread.deallocatedp\" value should equal "
 	    "\"thread.deallocated\" value");
diff --git a/test/integration/extent.c b/test/integration/extent.c
index 8acdad82..2af20ce2 100644
--- a/test/integration/extent.c
+++ b/test/integration/extent.c
@@ -194,8 +194,8 @@ TEST_BEGIN(test_extent)
 	bool xallocx_success_a, xallocx_success_b, xallocx_success_c;
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.extend", &arena_ind, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 	flags = MALLOCX_ARENA(arena_ind) | MALLOCX_TCACHE_NONE;
 
 	/* Install custom extent hooks. */
@@ -205,8 +205,9 @@ TEST_BEGIN(test_extent)
 	hooks_mib[1] = (size_t)arena_ind;
 	old_size = sizeof(extent_hooks_t *);
 	new_size = sizeof(extent_hooks_t *);
-	assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, &old_hooks, &old_size,
-	    &new_hooks, new_size), 0, "Unexpected extent_hooks error");
+	assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
+	    &old_size, (void *)&new_hooks, new_size), 0,
+	    "Unexpected extent_hooks error");
 	orig_hooks = old_hooks;
 	assert_ptr_ne(old_hooks->alloc, extent_alloc, "Unexpected alloc error");
 	assert_ptr_ne(old_hooks->dalloc, extent_dalloc,
@@ -221,12 +222,12 @@ TEST_BEGIN(test_extent)
 
 	/* Get large size classes. */
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("arenas.lextent.0.size", &large0, &sz, NULL, 0), 0,
-	    "Unexpected arenas.lextent.0.size failure");
-	assert_d_eq(mallctl("arenas.lextent.1.size", &large1, &sz, NULL, 0), 0,
-	    "Unexpected arenas.lextent.1.size failure");
-	assert_d_eq(mallctl("arenas.lextent.2.size", &large2, &sz, NULL, 0), 0,
-	    "Unexpected arenas.lextent.2.size failure");
+	assert_d_eq(mallctl("arenas.lextent.0.size", (void *)&large0, &sz, NULL,
+	    0), 0, "Unexpected arenas.lextent.0.size failure");
+	assert_d_eq(mallctl("arenas.lextent.1.size", (void *)&large1, &sz, NULL,
+	    0), 0, "Unexpected arenas.lextent.1.size failure");
+	assert_d_eq(mallctl("arenas.lextent.2.size", (void *)&large2, &sz, NULL,
+	    0), 0, "Unexpected arenas.lextent.2.size failure");
 
 	/* Test dalloc/decommit/purge cascade. */
 	purge_miblen = sizeof(purge_mib)/sizeof(size_t);
@@ -287,9 +288,9 @@ TEST_BEGIN(test_extent)
 
 	/* Restore extent hooks. */
 	assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, NULL, NULL,
-	    &old_hooks, new_size), 0, "Unexpected extent_hooks error");
-	assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, &old_hooks, &old_size,
-	    NULL, 0), 0, "Unexpected extent_hooks error");
+	    (void *)&old_hooks, new_size), 0, "Unexpected extent_hooks error");
+	assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
+	    &old_size, NULL, 0), 0, "Unexpected extent_hooks error");
 	assert_ptr_eq(old_hooks, orig_hooks, "Unexpected hooks error");
 	assert_ptr_eq(old_hooks->alloc, orig_hooks->alloc,
 	    "Unexpected alloc error");
diff --git a/test/integration/mallocx.c b/test/integration/mallocx.c
index 9d623eb7..4fd290c0 100644
--- a/test/integration/mallocx.c
+++ b/test/integration/mallocx.c
@@ -11,7 +11,7 @@ get_nsizes_impl(const char *cmd)
 	size_t z;
 
 	z = sizeof(unsigned);
-	assert_d_eq(mallctl(cmd, &ret, &z, NULL, 0), 0,
+	assert_d_eq(mallctl(cmd, (void *)&ret, &z, NULL, 0), 0,
 	    "Unexpected mallctl(\"%s\", ...) failure", cmd);
 
 	return (ret);
@@ -37,7 +37,7 @@ get_size_impl(const char *cmd, size_t ind)
 	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
 	mib[2] = ind;
 	z = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &ret, &z, NULL, 0),
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&ret, &z, NULL, 0),
 	    0, "Unexpected mallctlbymib([\"%s\", %zu], ...) failure", cmd, ind);
 
 	return (ret);
diff --git a/test/integration/overflow.c b/test/integration/overflow.c
index 8dea1c95..3e1e15f9 100644
--- a/test/integration/overflow.c
+++ b/test/integration/overflow.c
@@ -8,8 +8,8 @@ TEST_BEGIN(test_overflow)
 	void *p;
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.nlextents", &nlextents, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("arenas.nlextents", (void *)&nlextents, &sz, NULL,
+	    0), 0, "Unexpected mallctl() error");
 
 	miblen = sizeof(mib) / sizeof(size_t);
 	assert_d_eq(mallctlnametomib("arenas.lextent.0.size", mib, &miblen), 0,
@@ -17,8 +17,8 @@ TEST_BEGIN(test_overflow)
 	mib[2] = nlextents - 1;
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &max_size_class, &sz, NULL, 0), 0,
-	    "Unexpected mallctlbymib() error");
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&max_size_class, &sz,
+	    NULL, 0), 0, "Unexpected mallctlbymib() error");
 
 	assert_ptr_null(malloc(max_size_class + 1),
 	    "Expected OOM due to over-sized allocation request");
diff --git a/test/integration/rallocx.c b/test/integration/rallocx.c
index 030fb479..dd89e8cb 100644
--- a/test/integration/rallocx.c
+++ b/test/integration/rallocx.c
@@ -7,7 +7,7 @@ get_nsizes_impl(const char *cmd)
 	size_t z;
 
 	z = sizeof(unsigned);
-	assert_d_eq(mallctl(cmd, &ret, &z, NULL, 0), 0,
+	assert_d_eq(mallctl(cmd, (void *)&ret, &z, NULL, 0), 0,
 	    "Unexpected mallctl(\"%s\", ...) failure", cmd);
 
 	return (ret);
@@ -33,7 +33,7 @@ get_size_impl(const char *cmd, size_t ind)
 	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
 	mib[2] = ind;
 	z = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &ret, &z, NULL, 0),
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&ret, &z, NULL, 0),
 	    0, "Unexpected mallctlbymib([\"%s\", %zu], ...) failure", cmd, ind);
 
 	return (ret);
diff --git a/test/integration/thread_arena.c b/test/integration/thread_arena.c
index 67be5351..7a35a635 100644
--- a/test/integration/thread_arena.c
+++ b/test/integration/thread_arena.c
@@ -16,8 +16,8 @@ thd_start(void *arg)
 	free(p);
 
 	size = sizeof(arena_ind);
-	if ((err = mallctl("thread.arena", &arena_ind, &size, &main_arena_ind,
-	    sizeof(main_arena_ind)))) {
+	if ((err = mallctl("thread.arena", (void *)&arena_ind, &size,
+	    (void *)&main_arena_ind, sizeof(main_arena_ind)))) {
 		char buf[BUFERROR_BUF];
 
 		buferror(err, buf, sizeof(buf));
@@ -25,7 +25,8 @@ thd_start(void *arg)
 	}
 
 	size = sizeof(arena_ind);
-	if ((err = mallctl("thread.arena", &arena_ind, &size, NULL, 0))) {
+	if ((err = mallctl("thread.arena", (void *)&arena_ind, &size, NULL,
+	    0))) {
 		char buf[BUFERROR_BUF];
 
 		buferror(err, buf, sizeof(buf));
@@ -50,7 +51,8 @@ TEST_BEGIN(test_thread_arena)
 	assert_ptr_not_null(p, "Error in malloc()");
 
 	size = sizeof(arena_ind);
-	if ((err = mallctl("thread.arena", &arena_ind, &size, NULL, 0))) {
+	if ((err = mallctl("thread.arena", (void *)&arena_ind, &size, NULL,
+	    0))) {
 		char buf[BUFERROR_BUF];
 
 		buferror(err, buf, sizeof(buf));
diff --git a/test/integration/thread_tcache_enabled.c b/test/integration/thread_tcache_enabled.c
index f4e89c68..2c2825e1 100644
--- a/test/integration/thread_tcache_enabled.c
+++ b/test/integration/thread_tcache_enabled.c
@@ -16,7 +16,8 @@ thd_start(void *arg)
 	bool e0, e1;
 
 	sz = sizeof(bool);
-	if ((err = mallctl("thread.tcache.enabled", &e0, &sz, NULL, 0))) {
+	if ((err = mallctl("thread.tcache.enabled", (void *)&e0, &sz, NULL,
+	    0))) {
 		if (err == ENOENT) {
 			assert_false(config_tcache,
 			    "ENOENT should only be returned if tcache is "
@@ -27,53 +28,53 @@ thd_start(void *arg)
 
 	if (e0) {
 		e1 = false;
-		assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz),
-		    0, "Unexpected mallctl() error");
+		assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+		    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 		assert_true(e0, "tcache should be enabled");
 	}
 
 	e1 = true;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_false(e0, "tcache should be disabled");
 
 	e1 = true;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_true(e0, "tcache should be enabled");
 
 	e1 = false;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_true(e0, "tcache should be enabled");
 
 	e1 = false;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_false(e0, "tcache should be disabled");
 
 	free(malloc(1));
 	e1 = true;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_false(e0, "tcache should be disabled");
 
 	free(malloc(1));
 	e1 = true;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_true(e0, "tcache should be enabled");
 
 	free(malloc(1));
 	e1 = false;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_true(e0, "tcache should be enabled");
 
 	free(malloc(1));
 	e1 = false;
-	assert_d_eq(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("thread.tcache.enabled", (void *)&e0, &sz,
+	    (void *)&e1, sz), 0, "Unexpected mallctl() error");
 	assert_false(e0, "tcache should be disabled");
 
 	free(malloc(1));
diff --git a/test/integration/xallocx.c b/test/integration/xallocx.c
index 4dcf08da..f6083728 100644
--- a/test/integration/xallocx.c
+++ b/test/integration/xallocx.c
@@ -16,8 +16,8 @@ arena_ind(void)
 
 	if (ind == 0) {
 		size_t sz = sizeof(ind);
-		assert_d_eq(mallctl("arenas.extend", &ind, &sz, NULL, 0), 0,
-		    "Unexpected mallctl failure creating arena");
+		assert_d_eq(mallctl("arenas.extend", (void *)&ind, &sz, NULL,
+		    0), 0, "Unexpected mallctl failure creating arena");
 	}
 
 	return (ind);
@@ -78,7 +78,7 @@ get_nsizes_impl(const char *cmd)
 	size_t z;
 
 	z = sizeof(unsigned);
-	assert_d_eq(mallctl(cmd, &ret, &z, NULL, 0), 0,
+	assert_d_eq(mallctl(cmd, (void *)&ret, &z, NULL, 0), 0,
 	    "Unexpected mallctl(\"%s\", ...) failure", cmd);
 
 	return (ret);
@@ -111,7 +111,7 @@ get_size_impl(const char *cmd, size_t ind)
 	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
 	mib[2] = ind;
 	z = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &ret, &z, NULL, 0),
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&ret, &z, NULL, 0),
 	    0, "Unexpected mallctlbymib([\"%s\", %zu], ...) failure", cmd, ind);
 
 	return (ret);
diff --git a/test/unit/arena_reset.c b/test/unit/arena_reset.c
index 61caf3c5..6c944b2e 100644
--- a/test/unit/arena_reset.c
+++ b/test/unit/arena_reset.c
@@ -11,7 +11,7 @@ get_nsizes_impl(const char *cmd)
 	size_t z;
 
 	z = sizeof(unsigned);
-	assert_d_eq(mallctl(cmd, &ret, &z, NULL, 0), 0,
+	assert_d_eq(mallctl(cmd, (void *)&ret, &z, NULL, 0), 0,
 	    "Unexpected mallctl(\"%s\", ...) failure", cmd);
 
 	return (ret);
@@ -44,7 +44,7 @@ get_size_impl(const char *cmd, size_t ind)
 	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
 	mib[2] = ind;
 	z = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &ret, &z, NULL, 0),
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&ret, &z, NULL, 0),
 	    0, "Unexpected mallctlbymib([\"%s\", %zu], ...) failure", cmd, ind);
 
 	return (ret);
@@ -90,8 +90,8 @@ TEST_BEGIN(test_arena_reset)
 	tsdn_t *tsdn;
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.extend", &arena_ind, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 
 	flags = MALLOCX_ARENA(arena_ind) | MALLOCX_TCACHE_NONE;
 
diff --git a/test/unit/decay.c b/test/unit/decay.c
index 058a58cb..7efecf0f 100644
--- a/test/unit/decay.c
+++ b/test/unit/decay.c
@@ -38,8 +38,8 @@ TEST_BEGIN(test_decay_ticks)
 	    "Unexpected failure getting decay ticker");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("arenas.lextent.0.size", &large0, &sz, NULL, 0), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("arenas.lextent.0.size", (void *)&large0, &sz, NULL,
+	    0), 0, "Unexpected mallctl failure");
 
 	/*
 	 * Test the standard APIs using a large size class, since we can't
@@ -170,8 +170,8 @@ TEST_BEGIN(test_decay_ticks)
 		tcache_sizes[1] = 1;
 
 		sz = sizeof(unsigned);
-		assert_d_eq(mallctl("tcache.create", &tcache_ind, &sz, NULL, 0),
-		    0, "Unexpected mallctl failure");
+		assert_d_eq(mallctl("tcache.create", (void *)&tcache_ind, &sz,
+		    NULL, 0), 0, "Unexpected mallctl failure");
 
 		for (i = 0; i < sizeof(tcache_sizes) / sizeof(size_t); i++) {
 			sz = tcache_sizes[i];
@@ -188,7 +188,7 @@ TEST_BEGIN(test_decay_ticks)
 			dallocx(p, MALLOCX_TCACHE(tcache_ind));
 			tick0 = ticker_read(decay_ticker);
 			assert_d_eq(mallctl("tcache.flush", NULL, NULL,
-			    &tcache_ind, sizeof(unsigned)), 0,
+			    (void *)&tcache_ind, sizeof(unsigned)), 0,
 			    "Unexpected mallctl failure");
 			tick1 = ticker_read(decay_ticker);
 			assert_u32_ne(tick1, tick0,
@@ -221,8 +221,8 @@ TEST_BEGIN(test_decay_ticker)
 		size_t tcache_max;
 
 		sz = sizeof(size_t);
-		assert_d_eq(mallctl("arenas.tcache_max", &tcache_max, &sz, NULL,
-		    0), 0, "Unexpected mallctl failure");
+		assert_d_eq(mallctl("arenas.tcache_max", (void *)&tcache_max,
+		    &sz, NULL, 0), 0, "Unexpected mallctl failure");
 		large = nallocx(tcache_max + 1, flags);
 	}  else {
 		sz = sizeof(size_t);
@@ -232,11 +232,11 @@ TEST_BEGIN(test_decay_ticker)
 
 	assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
 	    "Unexpected mallctl failure");
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(uint64_t)), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
+	    sizeof(uint64_t)), 0, "Unexpected mallctl failure");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.npurge", &npurge0, &sz, NULL, 0),
-	    config_stats ? 0 : ENOENT, "Unexpected mallctl result");
+	assert_d_eq(mallctl("stats.arenas.0.npurge", (void *)&npurge0, &sz,
+	    NULL, 0), config_stats ? 0 : ENOENT, "Unexpected mallctl result");
 
 	for (i = 0; i < NPS; i++) {
 		ps[i] = mallocx(large, flags);
@@ -276,11 +276,11 @@ TEST_BEGIN(test_decay_ticker)
 			assert_ptr_not_null(p, "Unexpected mallocx() failure");
 			dallocx(p, flags);
 		}
-		assert_d_eq(mallctl("epoch", NULL, NULL, &epoch,
+		assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
 		    sizeof(uint64_t)), 0, "Unexpected mallctl failure");
 		sz = sizeof(uint64_t);
-		assert_d_eq(mallctl("stats.arenas.0.npurge", &npurge1, &sz,
-		    NULL, 0), config_stats ? 0 : ENOENT,
+		assert_d_eq(mallctl("stats.arenas.0.npurge", (void *)&npurge1,
+		    &sz, NULL, 0), config_stats ? 0 : ENOENT,
 		    "Unexpected mallctl result");
 
 		nstime_update(&time);
@@ -304,16 +304,16 @@ TEST_BEGIN(test_decay_nonmonotonic)
 	unsigned i, nupdates0;
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("arenas.lextent.0.size", &large0, &sz, NULL, 0), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("arenas.lextent.0.size", (void *)&large0, &sz, NULL,
+	    0), 0, "Unexpected mallctl failure");
 
 	assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
 	    "Unexpected mallctl failure");
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(uint64_t)), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
+	    sizeof(uint64_t)), 0, "Unexpected mallctl failure");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.npurge", &npurge0, &sz, NULL, 0),
-	    config_stats ? 0 : ENOENT, "Unexpected mallctl result");
+	assert_d_eq(mallctl("stats.arenas.0.npurge", (void *)&npurge0, &sz,
+	    NULL, 0), config_stats ? 0 : ENOENT, "Unexpected mallctl result");
 
 	nupdates_mock = 0;
 	nstime_init(&time_mock, 0);
@@ -339,11 +339,11 @@ TEST_BEGIN(test_decay_nonmonotonic)
 		    "Expected nstime_update() to be called");
 	}
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(uint64_t)), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
+	    sizeof(uint64_t)), 0, "Unexpected mallctl failure");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.npurge", &npurge1, &sz, NULL, 0),
-	    config_stats ? 0 : ENOENT, "Unexpected mallctl result");
+	assert_d_eq(mallctl("stats.arenas.0.npurge", (void *)&npurge1, &sz,
+	    NULL, 0), config_stats ? 0 : ENOENT, "Unexpected mallctl result");
 
 	if (config_stats)
 		assert_u64_eq(npurge0, npurge1, "Unexpected purging occurred");
diff --git a/test/unit/extent_quantize.c b/test/unit/extent_quantize.c
index d8928da0..43fa3604 100644
--- a/test/unit/extent_quantize.c
+++ b/test/unit/extent_quantize.c
@@ -13,7 +13,7 @@ TEST_BEGIN(test_small_extent_size)
 	 */
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.nbins", &nbins, &sz, NULL, 0), 0,
+	assert_d_eq(mallctl("arenas.nbins", (void *)&nbins, &sz, NULL, 0), 0,
 	    "Unexpected mallctl failure");
 
 	assert_d_eq(mallctlnametomib("arenas.bin.0.slab_size", mib, &miblen), 0,
@@ -21,8 +21,8 @@ TEST_BEGIN(test_small_extent_size)
 	for (i = 0; i < nbins; i++) {
 		mib[2] = i;
 		sz = sizeof(size_t);
-		assert_d_eq(mallctlbymib(mib, miblen, &extent_size, &sz, NULL,
-		    0), 0, "Unexpected mallctlbymib failure");
+		assert_d_eq(mallctlbymib(mib, miblen, (void *)&extent_size, &sz,
+		    NULL, 0), 0, "Unexpected mallctlbymib failure");
 		assert_zu_eq(extent_size,
 		    extent_size_quantize_floor(extent_size),
 		    "Small extent quantization should be a no-op "
@@ -49,12 +49,12 @@ TEST_BEGIN(test_large_extent_size)
 	 */
 
 	sz = sizeof(bool);
-	assert_d_eq(mallctl("config.cache_oblivious", &cache_oblivious, &sz,
-	    NULL, 0), 0, "Unexpected mallctl failure");
+	assert_d_eq(mallctl("config.cache_oblivious", (void *)&cache_oblivious,
+	    &sz, NULL, 0), 0, "Unexpected mallctl failure");
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.nlextents", &nlextents, &sz, NULL, 0), 0,
-	    "Unexpected mallctl failure");
+	assert_d_eq(mallctl("arenas.nlextents", (void *)&nlextents, &sz, NULL,
+	    0), 0, "Unexpected mallctl failure");
 
 	assert_d_eq(mallctlnametomib("arenas.lextent.0.size", mib, &miblen), 0,
 	    "Unexpected mallctlnametomib failure");
@@ -63,8 +63,8 @@ TEST_BEGIN(test_large_extent_size)
 
 		mib[2] = i;
 		sz = sizeof(size_t);
-		assert_d_eq(mallctlbymib(mib, miblen, &lextent_size, &sz, NULL,
-		    0), 0, "Unexpected mallctlbymib failure");
+		assert_d_eq(mallctlbymib(mib, miblen, (void *)&lextent_size,
+		    &sz, NULL, 0), 0, "Unexpected mallctlbymib failure");
 		extent_size = cache_oblivious ? lextent_size + PAGE :
 		    lextent_size;
 		floor = extent_size_quantize_floor(extent_size);
diff --git a/test/unit/mallctl.c b/test/unit/mallctl.c
index 0e979a11..5073c7b1 100644
--- a/test/unit/mallctl.c
+++ b/test/unit/mallctl.c
@@ -12,16 +12,18 @@ TEST_BEGIN(test_mallctl_errors)
 	    EPERM, "mallctl() should return EPERM on attempt to write "
 	    "read-only value");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)-1),
-	    EINVAL, "mallctl() should return EINVAL for input size mismatch");
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)+1),
-	    EINVAL, "mallctl() should return EINVAL for input size mismatch");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
+	    sizeof(epoch)-1), EINVAL,
+	    "mallctl() should return EINVAL for input size mismatch");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch,
+	    sizeof(epoch)+1), EINVAL,
+	    "mallctl() should return EINVAL for input size mismatch");
 
 	sz = sizeof(epoch)-1;
-	assert_d_eq(mallctl("epoch", &epoch, &sz, NULL, 0), EINVAL,
+	assert_d_eq(mallctl("epoch", (void *)&epoch, &sz, NULL, 0), EINVAL,
 	    "mallctl() should return EINVAL for output size mismatch");
 	sz = sizeof(epoch)+1;
-	assert_d_eq(mallctl("epoch", &epoch, &sz, NULL, 0), EINVAL,
+	assert_d_eq(mallctl("epoch", (void *)&epoch, &sz, NULL, 0), EINVAL,
 	    "mallctl() should return EINVAL for output size mismatch");
 }
 TEST_END
@@ -56,18 +58,20 @@ TEST_BEGIN(test_mallctlbymib_errors)
 	assert_d_eq(mallctlnametomib("epoch", mib, &miblen), 0,
 	    "Unexpected mallctlnametomib() failure");
 
-	assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &epoch,
+	assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, (void *)&epoch,
 	    sizeof(epoch)-1), EINVAL,
 	    "mallctlbymib() should return EINVAL for input size mismatch");
-	assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &epoch,
+	assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, (void *)&epoch,
 	    sizeof(epoch)+1), EINVAL,
 	    "mallctlbymib() should return EINVAL for input size mismatch");
 
 	sz = sizeof(epoch)-1;
-	assert_d_eq(mallctlbymib(mib, miblen, &epoch, &sz, NULL, 0), EINVAL,
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&epoch, &sz, NULL, 0),
+	    EINVAL,
 	    "mallctlbymib() should return EINVAL for output size mismatch");
 	sz = sizeof(epoch)+1;
-	assert_d_eq(mallctlbymib(mib, miblen, &epoch, &sz, NULL, 0), EINVAL,
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&epoch, &sz, NULL, 0),
+	    EINVAL,
 	    "mallctlbymib() should return EINVAL for output size mismatch");
 }
 TEST_END
@@ -83,18 +87,19 @@ TEST_BEGIN(test_mallctl_read_write)
 	assert_zu_eq(sz, sizeof(old_epoch), "Unexpected output size");
 
 	/* Read. */
-	assert_d_eq(mallctl("epoch", &old_epoch, &sz, NULL, 0), 0,
+	assert_d_eq(mallctl("epoch", (void *)&old_epoch, &sz, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
 	assert_zu_eq(sz, sizeof(old_epoch), "Unexpected output size");
 
 	/* Write. */
-	assert_d_eq(mallctl("epoch", NULL, NULL, &new_epoch, sizeof(new_epoch)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&new_epoch,
+	    sizeof(new_epoch)), 0, "Unexpected mallctl() failure");
 	assert_zu_eq(sz, sizeof(old_epoch), "Unexpected output size");
 
 	/* Read+write. */
-	assert_d_eq(mallctl("epoch", &old_epoch, &sz, &new_epoch,
-	    sizeof(new_epoch)), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", (void *)&old_epoch, &sz,
+	    (void *)&new_epoch, sizeof(new_epoch)), 0,
+	    "Unexpected mallctl() failure");
 	assert_zu_eq(sz, sizeof(old_epoch), "Unexpected output size");
 }
 TEST_END
@@ -120,8 +125,8 @@ TEST_BEGIN(test_mallctl_config)
 #define	TEST_MALLCTL_CONFIG(config, t) do {				\
 	t oldval;							\
 	size_t sz = sizeof(oldval);					\
-	assert_d_eq(mallctl("config."#config, &oldval, &sz, NULL, 0),	\
-	    0, "Unexpected mallctl() failure");				\
+	assert_d_eq(mallctl("config."#config, (void *)&oldval, &sz,	\
+	    NULL, 0), 0, "Unexpected mallctl() failure");		\
 	assert_b_eq(oldval, config_##config, "Incorrect config value");	\
 	assert_zu_eq(sz, sizeof(oldval), "Unexpected output size");	\
 } while (0)
@@ -153,7 +158,8 @@ TEST_BEGIN(test_mallctl_opt)
 	t oldval;							\
 	size_t sz = sizeof(oldval);					\
 	int expected = config_##config ? 0 : ENOENT;			\
-	int result = mallctl("opt."#opt, &oldval, &sz, NULL, 0);	\
+	int result = mallctl("opt."#opt, (void *)&oldval, &sz, NULL,	\
+	    0);								\
 	assert_d_eq(result, expected,					\
 	    "Unexpected mallctl() result for opt."#opt);		\
 	assert_zu_eq(sz, sizeof(oldval), "Unexpected output size");	\
@@ -191,7 +197,7 @@ TEST_BEGIN(test_manpage_example)
 	size_t len, miblen;
 
 	len = sizeof(nbins);
-	assert_d_eq(mallctl("arenas.nbins", &nbins, &len, NULL, 0), 0,
+	assert_d_eq(mallctl("arenas.nbins", (void *)&nbins, &len, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
 
 	miblen = 4;
@@ -202,8 +208,8 @@ TEST_BEGIN(test_manpage_example)
 
 		mib[2] = i;
 		len = sizeof(bin_size);
-		assert_d_eq(mallctlbymib(mib, miblen, &bin_size, &len, NULL, 0),
-		    0, "Unexpected mallctlbymib() failure");
+		assert_d_eq(mallctlbymib(mib, miblen, (void *)&bin_size, &len,
+		    NULL, 0), 0, "Unexpected mallctlbymib() failure");
 		/* Do something with bin_size... */
 	}
 }
@@ -252,25 +258,25 @@ TEST_BEGIN(test_tcache)
 	/* Create tcaches. */
 	for (i = 0; i < NTCACHES; i++) {
 		sz = sizeof(unsigned);
-		assert_d_eq(mallctl("tcache.create", &tis[i], &sz, NULL, 0), 0,
-		    "Unexpected mallctl() failure, i=%u", i);
+		assert_d_eq(mallctl("tcache.create", (void *)&tis[i], &sz, NULL,
+		    0), 0, "Unexpected mallctl() failure, i=%u", i);
 	}
 
 	/* Exercise tcache ID recycling. */
 	for (i = 0; i < NTCACHES; i++) {
-		assert_d_eq(mallctl("tcache.destroy", NULL, NULL, &tis[i],
-		    sizeof(unsigned)), 0, "Unexpected mallctl() failure, i=%u",
-		    i);
+		assert_d_eq(mallctl("tcache.destroy", NULL, NULL,
+		    (void *)&tis[i], sizeof(unsigned)), 0,
+		    "Unexpected mallctl() failure, i=%u", i);
 	}
 	for (i = 0; i < NTCACHES; i++) {
 		sz = sizeof(unsigned);
-		assert_d_eq(mallctl("tcache.create", &tis[i], &sz, NULL, 0), 0,
-		    "Unexpected mallctl() failure, i=%u", i);
+		assert_d_eq(mallctl("tcache.create", (void *)&tis[i], &sz, NULL,
+		    0), 0, "Unexpected mallctl() failure, i=%u", i);
 	}
 
 	/* Flush empty tcaches. */
 	for (i = 0; i < NTCACHES; i++) {
-		assert_d_eq(mallctl("tcache.flush", NULL, NULL, &tis[i],
+		assert_d_eq(mallctl("tcache.flush", NULL, NULL, (void *)&tis[i],
 		    sizeof(unsigned)), 0, "Unexpected mallctl() failure, i=%u",
 		    i);
 	}
@@ -315,16 +321,16 @@ TEST_BEGIN(test_tcache)
 
 	/* Flush some non-empty tcaches. */
 	for (i = 0; i < NTCACHES/2; i++) {
-		assert_d_eq(mallctl("tcache.flush", NULL, NULL, &tis[i],
+		assert_d_eq(mallctl("tcache.flush", NULL, NULL, (void *)&tis[i],
 		    sizeof(unsigned)), 0, "Unexpected mallctl() failure, i=%u",
 		    i);
 	}
 
 	/* Destroy tcaches. */
 	for (i = 0; i < NTCACHES; i++) {
-		assert_d_eq(mallctl("tcache.destroy", NULL, NULL, &tis[i],
-		    sizeof(unsigned)), 0, "Unexpected mallctl() failure, i=%u",
-		    i);
+		assert_d_eq(mallctl("tcache.destroy", NULL, NULL,
+		    (void *)&tis[i], sizeof(unsigned)), 0,
+		    "Unexpected mallctl() failure, i=%u", i);
 	}
 }
 TEST_END
@@ -334,15 +340,17 @@ TEST_BEGIN(test_thread_arena)
 	unsigned arena_old, arena_new, narenas;
 	size_t sz = sizeof(unsigned);
 
-	assert_d_eq(mallctl("arenas.narenas", &narenas, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 	assert_u_eq(narenas, opt_narenas, "Number of arenas incorrect");
 	arena_new = narenas - 1;
-	assert_d_eq(mallctl("thread.arena", &arena_old, &sz, &arena_new,
-	    sizeof(unsigned)), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", (void *)&arena_old, &sz,
+	    (void *)&arena_new, sizeof(unsigned)), 0,
+	    "Unexpected mallctl() failure");
 	arena_new = 0;
-	assert_d_eq(mallctl("thread.arena", &arena_old, &sz, &arena_new,
-	    sizeof(unsigned)), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", (void *)&arena_old, &sz,
+	    (void *)&arena_new, sizeof(unsigned)), 0,
+	    "Unexpected mallctl() failure");
 }
 TEST_END
 
@@ -351,25 +359,25 @@ TEST_BEGIN(test_arena_i_decay_time)
 	ssize_t decay_time, orig_decay_time, prev_decay_time;
 	size_t sz = sizeof(ssize_t);
 
-	assert_d_eq(mallctl("arena.0.decay_time", &orig_decay_time, &sz,
+	assert_d_eq(mallctl("arena.0.decay_time", (void *)&orig_decay_time, &sz,
 	    NULL, 0), 0, "Unexpected mallctl() failure");
 
 	decay_time = -2;
 	assert_d_eq(mallctl("arena.0.decay_time", NULL, NULL,
-	    &decay_time, sizeof(ssize_t)), EFAULT,
+	    (void *)&decay_time, sizeof(ssize_t)), EFAULT,
 	    "Unexpected mallctl() success");
 
 	decay_time = 0x7fffffff;
 	assert_d_eq(mallctl("arena.0.decay_time", NULL, NULL,
-	    &decay_time, sizeof(ssize_t)), 0,
+	    (void *)&decay_time, sizeof(ssize_t)), 0,
 	    "Unexpected mallctl() failure");
 
 	for (prev_decay_time = decay_time, decay_time = -1;
 	    decay_time < 20; prev_decay_time = decay_time, decay_time++) {
 		ssize_t old_decay_time;
 
-		assert_d_eq(mallctl("arena.0.decay_time", &old_decay_time,
-		    &sz, &decay_time, sizeof(ssize_t)), 0,
+		assert_d_eq(mallctl("arena.0.decay_time", (void *)&old_decay_time,
+		    &sz, (void *)&decay_time, sizeof(ssize_t)), 0,
 		    "Unexpected mallctl() failure");
 		assert_zd_eq(old_decay_time, prev_decay_time,
 		    "Unexpected old arena.0.decay_time");
@@ -387,8 +395,8 @@ TEST_BEGIN(test_arena_i_purge)
 	assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
 
-	assert_d_eq(mallctl("arenas.narenas", &narenas, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 	assert_d_eq(mallctlnametomib("arena.0.purge", mib, &miblen), 0,
 	    "Unexpected mallctlnametomib() failure");
 	mib[1] = narenas;
@@ -407,8 +415,8 @@ TEST_BEGIN(test_arena_i_decay)
 	assert_d_eq(mallctl("arena.0.decay", NULL, NULL, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
 
-	assert_d_eq(mallctl("arenas.narenas", &narenas, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 	assert_d_eq(mallctlnametomib("arena.0.decay", mib, &miblen), 0,
 	    "Unexpected mallctlnametomib() failure");
 	mib[1] = narenas;
@@ -429,31 +437,35 @@ TEST_BEGIN(test_arena_i_dss)
 	    "Unexpected mallctlnametomib() error");
 
 	dss_prec_new = "disabled";
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_old, &sz, &dss_prec_new,
-	    sizeof(dss_prec_new)), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_old, &sz,
+	    (void *)&dss_prec_new, sizeof(dss_prec_new)), 0,
+	    "Unexpected mallctl() failure");
 	assert_str_ne(dss_prec_old, "primary",
 	    "Unexpected default for dss precedence");
 
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_new, &sz, &dss_prec_old,
-	    sizeof(dss_prec_old)), 0, "Unexpected mallctl() failure");
-
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_old, &sz, NULL, 0), 0,
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_new, &sz,
+	    (void *)&dss_prec_old, sizeof(dss_prec_old)), 0,
 	    "Unexpected mallctl() failure");
+
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_old, &sz, NULL,
+	    0), 0, "Unexpected mallctl() failure");
 	assert_str_ne(dss_prec_old, "primary",
 	    "Unexpected value for dss precedence");
 
 	mib[1] = narenas_total_get();
 	dss_prec_new = "disabled";
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_old, &sz, &dss_prec_new,
-	    sizeof(dss_prec_new)), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_old, &sz,
+	    (void *)&dss_prec_new, sizeof(dss_prec_new)), 0,
+	    "Unexpected mallctl() failure");
 	assert_str_ne(dss_prec_old, "primary",
 	    "Unexpected default for dss precedence");
 
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_new, &sz, &dss_prec_old,
-	    sizeof(dss_prec_new)), 0, "Unexpected mallctl() failure");
-
-	assert_d_eq(mallctlbymib(mib, miblen, &dss_prec_old, &sz, NULL, 0), 0,
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_new, &sz,
+	    (void *)&dss_prec_old, sizeof(dss_prec_new)), 0,
 	    "Unexpected mallctl() failure");
+
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&dss_prec_old, &sz, NULL,
+	    0), 0, "Unexpected mallctl() failure");
 	assert_str_ne(dss_prec_old, "primary",
 	    "Unexpected value for dss precedence");
 }
@@ -464,14 +476,14 @@ TEST_BEGIN(test_arenas_initialized)
 	unsigned narenas;
 	size_t sz = sizeof(narenas);
 
-	assert_d_eq(mallctl("arenas.narenas", &narenas, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas, &sz, NULL, 0),
+	    0, "Unexpected mallctl() failure");
 	{
 		VARIABLE_ARRAY(bool, initialized, narenas);
 
 		sz = narenas * sizeof(bool);
-		assert_d_eq(mallctl("arenas.initialized", initialized, &sz,
-		    NULL, 0), 0, "Unexpected mallctl() failure");
+		assert_d_eq(mallctl("arenas.initialized", (void *)initialized,
+		    &sz, NULL, 0), 0, "Unexpected mallctl() failure");
 	}
 }
 TEST_END
@@ -481,26 +493,26 @@ TEST_BEGIN(test_arenas_decay_time)
 	ssize_t decay_time, orig_decay_time, prev_decay_time;
 	size_t sz = sizeof(ssize_t);
 
-	assert_d_eq(mallctl("arenas.decay_time", &orig_decay_time, &sz,
+	assert_d_eq(mallctl("arenas.decay_time", (void *)&orig_decay_time, &sz,
 	    NULL, 0), 0, "Unexpected mallctl() failure");
 
 	decay_time = -2;
 	assert_d_eq(mallctl("arenas.decay_time", NULL, NULL,
-	    &decay_time, sizeof(ssize_t)), EFAULT,
+	    (void *)&decay_time, sizeof(ssize_t)), EFAULT,
 	    "Unexpected mallctl() success");
 
 	decay_time = 0x7fffffff;
 	assert_d_eq(mallctl("arenas.decay_time", NULL, NULL,
-	    &decay_time, sizeof(ssize_t)), 0,
+	    (void *)&decay_time, sizeof(ssize_t)), 0,
 	    "Expected mallctl() failure");
 
 	for (prev_decay_time = decay_time, decay_time = -1;
 	    decay_time < 20; prev_decay_time = decay_time, decay_time++) {
 		ssize_t old_decay_time;
 
-		assert_d_eq(mallctl("arenas.decay_time", &old_decay_time,
-		    &sz, &decay_time, sizeof(ssize_t)), 0,
-		    "Unexpected mallctl() failure");
+		assert_d_eq(mallctl("arenas.decay_time",
+		    (void *)&old_decay_time, &sz, (void *)&decay_time,
+		    sizeof(ssize_t)), 0, "Unexpected mallctl() failure");
 		assert_zd_eq(old_decay_time, prev_decay_time,
 		    "Unexpected old arenas.decay_time");
 	}
@@ -513,8 +525,8 @@ TEST_BEGIN(test_arenas_constants)
 #define	TEST_ARENAS_CONSTANT(t, name, expected) do {			\
 	t name;								\
 	size_t sz = sizeof(t);						\
-	assert_d_eq(mallctl("arenas."#name, &name, &sz, NULL, 0), 0,	\
-	    "Unexpected mallctl() failure");				\
+	assert_d_eq(mallctl("arenas."#name, (void *)&name, &sz, NULL,	\
+	    0), 0, "Unexpected mallctl() failure");			\
 	assert_zu_eq(name, expected, "Incorrect "#name" size");		\
 } while (0)
 
@@ -533,8 +545,8 @@ TEST_BEGIN(test_arenas_bin_constants)
 #define	TEST_ARENAS_BIN_CONSTANT(t, name, expected) do {		\
 	t name;								\
 	size_t sz = sizeof(t);						\
-	assert_d_eq(mallctl("arenas.bin.0."#name, &name, &sz, NULL, 0),	\
-	    0, "Unexpected mallctl() failure");				\
+	assert_d_eq(mallctl("arenas.bin.0."#name, (void *)&name, &sz,	\
+	    NULL, 0), 0, "Unexpected mallctl() failure");		\
 	assert_zu_eq(name, expected, "Incorrect "#name" size");		\
 } while (0)
 
@@ -553,8 +565,8 @@ TEST_BEGIN(test_arenas_lextent_constants)
 #define	TEST_ARENAS_LEXTENT_CONSTANT(t, name, expected) do {		\
 	t name;								\
 	size_t sz = sizeof(t);						\
-	assert_d_eq(mallctl("arenas.lextent.0."#name, &name, &sz, NULL,	\
-	    0), 0, "Unexpected mallctl() failure");			\
+	assert_d_eq(mallctl("arenas.lextent.0."#name, (void *)&name,	\
+	    &sz, NULL, 0), 0, "Unexpected mallctl() failure");		\
 	assert_zu_eq(name, expected, "Incorrect "#name" size");		\
 } while (0)
 
@@ -569,12 +581,12 @@ TEST_BEGIN(test_arenas_extend)
 	unsigned narenas_before, arena, narenas_after;
 	size_t sz = sizeof(unsigned);
 
-	assert_d_eq(mallctl("arenas.narenas", &narenas_before, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
-	assert_d_eq(mallctl("arenas.extend", &arena, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
-	assert_d_eq(mallctl("arenas.narenas", &narenas_after, &sz, NULL, 0), 0,
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas_before, &sz,
+	    NULL, 0), 0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.extend", (void *)&arena, &sz, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.narenas", (void *)&narenas_after, &sz, NULL,
+	    0), 0, "Unexpected mallctl() failure");
 
 	assert_u_eq(narenas_before+1, narenas_after,
 	    "Unexpected number of arenas before versus after extension");
@@ -588,8 +600,8 @@ TEST_BEGIN(test_stats_arenas)
 #define	TEST_STATS_ARENAS(t, name) do {					\
 	t name;								\
 	size_t sz = sizeof(t);						\
-	assert_d_eq(mallctl("stats.arenas.0."#name, &name, &sz, NULL,	\
-	    0), 0, "Unexpected mallctl() failure");			\
+	assert_d_eq(mallctl("stats.arenas.0."#name, (void *)&name, &sz,	\
+	    NULL, 0), 0, "Unexpected mallctl() failure");		\
 } while (0)
 
 	TEST_STATS_ARENAS(unsigned, nthreads);
diff --git a/test/unit/prof_accum.c b/test/unit/prof_accum.c
index fd229e0f..d941b5bc 100644
--- a/test/unit/prof_accum.c
+++ b/test/unit/prof_accum.c
@@ -68,8 +68,9 @@ TEST_BEGIN(test_idump)
 	test_skip_if(!config_prof);
 
 	active = true;
-	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
-	    0, "Unexpected mallctl failure while activating profiling");
+	assert_d_eq(mallctl("prof.active", NULL, NULL, (void *)&active,
+	    sizeof(active)), 0,
+	    "Unexpected mallctl failure while activating profiling");
 
 	prof_dump_open = prof_dump_open_intercept;
 
diff --git a/test/unit/prof_active.c b/test/unit/prof_active.c
index 81490957..d00943a4 100644
--- a/test/unit/prof_active.c
+++ b/test/unit/prof_active.c
@@ -12,7 +12,7 @@ mallctl_bool_get(const char *name, bool expected, const char *func, int line)
 	size_t sz;
 
 	sz = sizeof(old);
-	assert_d_eq(mallctl(name, &old, &sz, NULL, 0), 0,
+	assert_d_eq(mallctl(name, (void *)&old, &sz, NULL, 0), 0,
 	    "%s():%d: Unexpected mallctl failure reading %s", func, line, name);
 	assert_b_eq(old, expected, "%s():%d: Unexpected %s value", func, line,
 	    name);
@@ -26,7 +26,8 @@ mallctl_bool_set(const char *name, bool old_expected, bool val_new,
 	size_t sz;
 
 	sz = sizeof(old);
-	assert_d_eq(mallctl(name, &old, &sz, &val_new, sizeof(val_new)), 0,
+	assert_d_eq(mallctl(name, (void *)&old, &sz, (void *)&val_new,
+	    sizeof(val_new)), 0,
 	    "%s():%d: Unexpected mallctl failure reading/writing %s", func,
 	    line, name);
 	assert_b_eq(old, old_expected, "%s():%d: Unexpected %s value", func,
diff --git a/test/unit/prof_gdump.c b/test/unit/prof_gdump.c
index ca93f300..cb99acdf 100644
--- a/test/unit/prof_gdump.c
+++ b/test/unit/prof_gdump.c
@@ -28,8 +28,9 @@ TEST_BEGIN(test_gdump)
 	test_skip_if(!config_prof);
 
 	active = true;
-	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
-	    0, "Unexpected mallctl failure while activating profiling");
+	assert_d_eq(mallctl("prof.active", NULL, NULL, (void *)&active,
+	    sizeof(active)), 0,
+	    "Unexpected mallctl failure while activating profiling");
 
 	prof_dump_open = prof_dump_open_intercept;
 
@@ -45,8 +46,8 @@ TEST_BEGIN(test_gdump)
 
 	gdump = false;
 	sz = sizeof(gdump_old);
-	assert_d_eq(mallctl("prof.gdump", &gdump_old, &sz, &gdump,
-	    sizeof(gdump)), 0,
+	assert_d_eq(mallctl("prof.gdump", (void *)&gdump_old, &sz,
+	    (void *)&gdump, sizeof(gdump)), 0,
 	    "Unexpected mallctl failure while disabling prof.gdump");
 	assert(gdump_old);
 	did_prof_dump_open = false;
@@ -56,8 +57,8 @@ TEST_BEGIN(test_gdump)
 
 	gdump = true;
 	sz = sizeof(gdump_old);
-	assert_d_eq(mallctl("prof.gdump", &gdump_old, &sz, &gdump,
-	    sizeof(gdump)), 0,
+	assert_d_eq(mallctl("prof.gdump", (void *)&gdump_old, &sz,
+	    (void *)&gdump, sizeof(gdump)), 0,
 	    "Unexpected mallctl failure while enabling prof.gdump");
 	assert(!gdump_old);
 	did_prof_dump_open = false;
diff --git a/test/unit/prof_idump.c b/test/unit/prof_idump.c
index 2b0639d8..c293350f 100644
--- a/test/unit/prof_idump.c
+++ b/test/unit/prof_idump.c
@@ -36,8 +36,9 @@ TEST_BEGIN(test_idump)
 	test_skip_if(!config_prof);
 
 	active = true;
-	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
-	    0, "Unexpected mallctl failure while activating profiling");
+	assert_d_eq(mallctl("prof.active", NULL, NULL, (void *)&active,
+	    sizeof(active)), 0,
+	    "Unexpected mallctl failure while activating profiling");
 
 	prof_dump_open = prof_dump_open_intercept;
 
diff --git a/test/unit/prof_reset.c b/test/unit/prof_reset.c
index 5ae45fd2..59d70796 100644
--- a/test/unit/prof_reset.c
+++ b/test/unit/prof_reset.c
@@ -20,8 +20,8 @@ static void
 set_prof_active(bool active)
 {
 
-	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
-	    0, "Unexpected mallctl failure");
+	assert_d_eq(mallctl("prof.active", NULL, NULL, (void *)&active,
+	    sizeof(active)), 0, "Unexpected mallctl failure");
 }
 
 static size_t
@@ -30,7 +30,8 @@ get_lg_prof_sample(void)
 	size_t lg_prof_sample;
 	size_t sz = sizeof(size_t);
 
-	assert_d_eq(mallctl("prof.lg_sample", &lg_prof_sample, &sz, NULL, 0), 0,
+	assert_d_eq(mallctl("prof.lg_sample", (void *)&lg_prof_sample, &sz,
+	    NULL, 0), 0,
 	    "Unexpected mallctl failure while reading profiling sample rate");
 	return (lg_prof_sample);
 }
@@ -39,7 +40,7 @@ static void
 do_prof_reset(size_t lg_prof_sample)
 {
 	assert_d_eq(mallctl("prof.reset", NULL, NULL,
-	    &lg_prof_sample, sizeof(size_t)), 0,
+	    (void *)&lg_prof_sample, sizeof(size_t)), 0,
 	    "Unexpected mallctl failure while resetting profile data");
 	assert_zu_eq(lg_prof_sample, get_lg_prof_sample(),
 	    "Expected profile sample rate change");
@@ -54,8 +55,8 @@ TEST_BEGIN(test_prof_reset_basic)
 	test_skip_if(!config_prof);
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("opt.lg_prof_sample", &lg_prof_sample_orig, &sz,
-	    NULL, 0), 0,
+	assert_d_eq(mallctl("opt.lg_prof_sample", (void *)&lg_prof_sample_orig,
+	    &sz, NULL, 0), 0,
 	    "Unexpected mallctl failure while reading profiling sample rate");
 	assert_zu_eq(lg_prof_sample_orig, 0,
 	    "Unexpected profiling sample rate");
diff --git a/test/unit/prof_thread_name.c b/test/unit/prof_thread_name.c
index f501158d..9ec54977 100644
--- a/test/unit/prof_thread_name.c
+++ b/test/unit/prof_thread_name.c
@@ -12,8 +12,9 @@ mallctl_thread_name_get_impl(const char *thread_name_expected, const char *func,
 	size_t sz;
 
 	sz = sizeof(thread_name_old);
-	assert_d_eq(mallctl("thread.prof.name", &thread_name_old, &sz, NULL, 0),
-	    0, "%s():%d: Unexpected mallctl failure reading thread.prof.name",
+	assert_d_eq(mallctl("thread.prof.name", (void *)&thread_name_old, &sz,
+	    NULL, 0), 0,
+	    "%s():%d: Unexpected mallctl failure reading thread.prof.name",
 	    func, line);
 	assert_str_eq(thread_name_old, thread_name_expected,
 	    "%s():%d: Unexpected thread.prof.name value", func, line);
@@ -26,8 +27,8 @@ mallctl_thread_name_set_impl(const char *thread_name, const char *func,
     int line)
 {
 
-	assert_d_eq(mallctl("thread.prof.name", NULL, NULL, &thread_name,
-	    sizeof(thread_name)), 0,
+	assert_d_eq(mallctl("thread.prof.name", NULL, NULL,
+	    (void *)&thread_name, sizeof(thread_name)), 0,
 	    "%s():%d: Unexpected mallctl failure reading thread.prof.name",
 	    func, line);
 	mallctl_thread_name_get_impl(thread_name, func, line);
@@ -46,15 +47,15 @@ TEST_BEGIN(test_prof_thread_name_validation)
 
 	/* NULL input shouldn't be allowed. */
 	thread_name = NULL;
-	assert_d_eq(mallctl("thread.prof.name", NULL, NULL, &thread_name,
-	    sizeof(thread_name)), EFAULT,
+	assert_d_eq(mallctl("thread.prof.name", NULL, NULL,
+	    (void *)&thread_name, sizeof(thread_name)), EFAULT,
 	    "Unexpected mallctl result writing \"%s\" to thread.prof.name",
 	    thread_name);
 
 	/* '\n' shouldn't be allowed. */
 	thread_name = "hi\nthere";
-	assert_d_eq(mallctl("thread.prof.name", NULL, NULL, &thread_name,
-	    sizeof(thread_name)), EFAULT,
+	assert_d_eq(mallctl("thread.prof.name", NULL, NULL,
+	    (void *)&thread_name, sizeof(thread_name)), EFAULT,
 	    "Unexpected mallctl result writing \"%s\" to thread.prof.name",
 	    thread_name);
 
@@ -64,8 +65,9 @@ TEST_BEGIN(test_prof_thread_name_validation)
 		size_t sz;
 
 		sz = sizeof(thread_name_old);
-		assert_d_eq(mallctl("thread.prof.name", &thread_name_old, &sz,
-		    &thread_name, sizeof(thread_name)), EPERM,
+		assert_d_eq(mallctl("thread.prof.name",
+		    (void *)&thread_name_old, &sz, (void *)&thread_name,
+		    sizeof(thread_name)), EPERM,
 		    "Unexpected mallctl result writing \"%s\" to "
 		    "thread.prof.name", thread_name);
 	}
diff --git a/test/unit/size_classes.c b/test/unit/size_classes.c
index f5a5873d..d4875549 100644
--- a/test/unit/size_classes.c
+++ b/test/unit/size_classes.c
@@ -8,8 +8,8 @@ get_max_size_class(void)
 	size_t sz, miblen, max_size_class;
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.nlextents", &nlextents, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() error");
+	assert_d_eq(mallctl("arenas.nlextents", (void *)&nlextents, &sz, NULL,
+	    0), 0, "Unexpected mallctl() error");
 
 	miblen = sizeof(mib) / sizeof(size_t);
 	assert_d_eq(mallctlnametomib("arenas.lextent.0.size", mib, &miblen), 0,
@@ -17,8 +17,8 @@ get_max_size_class(void)
 	mib[2] = nlextents - 1;
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctlbymib(mib, miblen, &max_size_class, &sz, NULL, 0), 0,
-	    "Unexpected mallctlbymib() error");
+	assert_d_eq(mallctlbymib(mib, miblen, (void *)&max_size_class, &sz,
+	    NULL, 0), 0, "Unexpected mallctlbymib() error");
 
 	return (max_size_class);
 }
diff --git a/test/unit/stats.c b/test/unit/stats.c
index ed0d3fe9..a99a88f0 100644
--- a/test/unit/stats.c
+++ b/test/unit/stats.c
@@ -6,14 +6,14 @@ TEST_BEGIN(test_stats_summary)
 	int expected = config_stats ? 0 : ENOENT;
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.allocated", &allocated, &sz, NULL, 0),
+	assert_d_eq(mallctl("stats.allocated", (void *)&allocated, &sz, NULL,
+	    0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.active", (void *)&active, &sz, NULL, 0),
 	    expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.active", &active, &sz, NULL, 0), expected,
-	    "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.resident", &resident, &sz, NULL, 0),
+	assert_d_eq(mallctl("stats.resident", (void *)&resident, &sz, NULL, 0),
+	    expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.mapped", (void *)&mapped, &sz, NULL, 0),
 	    expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.mapped", &mapped, &sz, NULL, 0), expected,
-	    "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_zu_le(allocated, active,
@@ -38,19 +38,21 @@ TEST_BEGIN(test_stats_large)
 	p = mallocx(SMALL_MAXCLASS+1, 0);
 	assert_ptr_not_null(p, "Unexpected mallocx() failure");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.large.allocated", &allocated, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.allocated",
+	    (void *)&allocated, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.large.nmalloc", &nmalloc, &sz, NULL,
-	    0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.large.ndalloc", &ndalloc, &sz, NULL,
-	    0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.large.nrequests", &nrequests, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.nmalloc", (void *)&nmalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.ndalloc", (void *)&ndalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.nrequests",
+	    (void *)&nrequests, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_zu_gt(allocated, 0,
@@ -76,8 +78,8 @@ TEST_BEGIN(test_stats_arenas_summary)
 	uint64_t npurge, nmadvise, purged;
 
 	arena = 0;
-	assert_d_eq(mallctl("thread.arena", NULL, NULL, &arena, sizeof(arena)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", NULL, NULL, (void *)&arena,
+	    sizeof(arena)), 0, "Unexpected mallctl() failure");
 
 	little = mallocx(SMALL_MAXCLASS, 0);
 	assert_ptr_not_null(little, "Unexpected mallocx() failure");
@@ -92,19 +94,19 @@ TEST_BEGIN(test_stats_arenas_summary)
 	assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
 	    "Unexpected mallctl() failure");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.mapped", &mapped, &sz, NULL, 0),
-	    expected, "Unexepected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.mapped", (void *)&mapped, &sz, NULL,
+	    0), expected, "Unexepected mallctl() result");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.npurge", &npurge, &sz, NULL, 0),
-	    expected, "Unexepected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.nmadvise", &nmadvise, &sz, NULL, 0),
-	    expected, "Unexepected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.purged", &purged, &sz, NULL, 0),
-	    expected, "Unexepected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.npurge", (void *)&npurge, &sz, NULL,
+	    0), expected, "Unexepected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.nmadvise", (void *)&nmadvise, &sz,
+	    NULL, 0), expected, "Unexepected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.purged", (void *)&purged, &sz, NULL,
+	    0), expected, "Unexepected mallctl() result");
 
 	if (config_stats) {
 		assert_u64_gt(npurge, 0,
@@ -142,8 +144,8 @@ TEST_BEGIN(test_stats_arenas_small)
 	no_lazy_lock(); /* Lazy locking would dodge tcache testing. */
 
 	arena = 0;
-	assert_d_eq(mallctl("thread.arena", NULL, NULL, &arena, sizeof(arena)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", NULL, NULL, (void *)&arena,
+	    sizeof(arena)), 0, "Unexpected mallctl() failure");
 
 	p = mallocx(SMALL_MAXCLASS, 0);
 	assert_ptr_not_null(p, "Unexpected mallocx() failure");
@@ -151,19 +153,21 @@ TEST_BEGIN(test_stats_arenas_small)
 	assert_d_eq(mallctl("thread.tcache.flush", NULL, NULL, NULL, 0),
 	    config_tcache ? 0 : ENOENT, "Unexpected mallctl() result");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.small.allocated", &allocated, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.small.allocated",
+	    (void *)&allocated, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.small.nmalloc", &nmalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.small.ndalloc", &ndalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.small.nrequests", &nrequests, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.small.nmalloc", (void *)&nmalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.small.ndalloc", (void *)&ndalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.small.nrequests",
+	    (void *)&nrequests, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_zu_gt(allocated, 0,
@@ -189,23 +193,24 @@ TEST_BEGIN(test_stats_arenas_large)
 	int expected = config_stats ? 0 : ENOENT;
 
 	arena = 0;
-	assert_d_eq(mallctl("thread.arena", NULL, NULL, &arena, sizeof(arena)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", NULL, NULL, (void *)&arena,
+	    sizeof(arena)), 0, "Unexpected mallctl() failure");
 
 	p = mallocx((1U << LG_LARGE_MINCLASS), 0);
 	assert_ptr_not_null(p, "Unexpected mallocx() failure");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.large.allocated", &allocated, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.allocated",
+	    (void *)&allocated, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.large.nmalloc", &nmalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.large.ndalloc", &ndalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.nmalloc", (void *)&nmalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.large.ndalloc", (void *)&ndalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_zu_gt(allocated, 0,
@@ -230,8 +235,8 @@ TEST_BEGIN(test_stats_arenas_bins)
 	int expected = config_stats ? 0 : ENOENT;
 
 	arena = 0;
-	assert_d_eq(mallctl("thread.arena", NULL, NULL, &arena, sizeof(arena)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", NULL, NULL, (void *)&arena,
+	    sizeof(arena)), 0, "Unexpected mallctl() failure");
 
 	p = mallocx(arena_bin_info[0].reg_size, 0);
 	assert_ptr_not_null(p, "Unexpected mallocx() failure");
@@ -239,35 +244,36 @@ TEST_BEGIN(test_stats_arenas_bins)
 	assert_d_eq(mallctl("thread.tcache.flush", NULL, NULL, NULL, 0),
 	    config_tcache ? 0 : ENOENT, "Unexpected mallctl() result");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nmalloc", &nmalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.ndalloc", &ndalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nrequests", &nrequests, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nmalloc", (void *)&nmalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.ndalloc", (void *)&ndalloc,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nrequests",
+	    (void *)&nrequests, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.curregs", &curregs, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.curregs", (void *)&curregs,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
 
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nfills", &nfills, &sz,
-	    NULL, 0), config_tcache ? expected : ENOENT,
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nfills", (void *)&nfills,
+	    &sz, NULL, 0), config_tcache ? expected : ENOENT,
 	    "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nflushes", &nflushes, &sz,
-	    NULL, 0), config_tcache ? expected : ENOENT,
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nflushes", (void *)&nflushes,
+	    &sz, NULL, 0), config_tcache ? expected : ENOENT,
 	    "Unexpected mallctl() result");
 
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nslabs", &nslabs, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.nreslabs", &nreslabs, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nslabs", (void *)&nslabs,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.nreslabs", (void *)&nreslabs,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("stats.arenas.0.bins.0.curslabs", &curslabs, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.bins.0.curslabs", (void *)&curslabs,
+	    &sz, NULL, 0), expected, "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_u64_gt(nmalloc, 0,
@@ -303,27 +309,30 @@ TEST_BEGIN(test_stats_arenas_lextents)
 	int expected = config_stats ? 0 : ENOENT;
 
 	arena = 0;
-	assert_d_eq(mallctl("thread.arena", NULL, NULL, &arena, sizeof(arena)),
-	    0, "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("thread.arena", NULL, NULL, (void *)&arena,
+	    sizeof(arena)), 0, "Unexpected mallctl() failure");
 
 	sz = sizeof(size_t);
-	assert_d_eq(mallctl("arenas.lextent.0.size", &hsize, &sz, NULL, 0), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("arenas.lextent.0.size", (void *)&hsize, &sz, NULL,
+	    0), 0, "Unexpected mallctl() failure");
 
 	p = mallocx(hsize, 0);
 	assert_ptr_not_null(p, "Unexpected mallocx() failure");
 
-	assert_d_eq(mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch)), 0,
-	    "Unexpected mallctl() failure");
+	assert_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
+	    0, "Unexpected mallctl() failure");
 
 	sz = sizeof(uint64_t);
-	assert_d_eq(mallctl("stats.arenas.0.lextents.0.nmalloc", &nmalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
-	assert_d_eq(mallctl("stats.arenas.0.lextents.0.ndalloc", &ndalloc, &sz,
-	    NULL, 0), expected, "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.lextents.0.nmalloc",
+	    (void *)&nmalloc, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
+	assert_d_eq(mallctl("stats.arenas.0.lextents.0.ndalloc",
+	    (void *)&ndalloc, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 	sz = sizeof(size_t);
 	assert_d_eq(mallctl("stats.arenas.0.lextents.0.curlextents",
-	    &curlextents, &sz, NULL, 0), expected, "Unexpected mallctl() result");
+	    (void *)&curlextents, &sz, NULL, 0), expected,
+	    "Unexpected mallctl() result");
 
 	if (config_stats) {
 		assert_u64_gt(nmalloc, 0,