Make versioned shared library suffix configurable

This allows for different patterns for file names:
- lib.so.version for e.g. Linux
- lib.version.dylib for OSX (which is much more common than
lib.dylib.version)
- lib.dll for Windows (no version at all).

Makefile.in

@@ -47,6 +47,7 @@ cfgoutputs_out := @cfgoutputs_out@
 enable_autogen := @enable_autogen@
 enable_experimental := @enable_experimental@
 DSO_LDFLAGS = @DSO_LDFLAGS@
+SOREV = @SOREV@
 
 ifeq (macho, $(ABI))
 TEST_LIBRARY_PATH := DYLD_FALLBACK_LIBRARY_PATH=$(objroot)lib
@@ -72,9 +73,11 @@ ifeq (macho, $(ABI))
 CSRCS += $(srcroot)src/zone.c
 endif
 STATIC_LIBS := $(objroot)lib/$(LIBJEMALLOC).$(A)
-DSOS := $(objroot)lib/$(LIBJEMALLOC).$(SO).$(REV) \
-	$(objroot)lib/$(LIBJEMALLOC).$(SO) \
-	$(objroot)lib/$(LIBJEMALLOC)_pic.$(A)
+DSOS := $(objroot)lib/$(LIBJEMALLOC)_pic.$(A) \
+	$(objroot)lib/$(LIBJEMALLOC).$(SOREV)
+ifneq ($(SOREV),$(SO))
+DSOS += $(objroot)lib/$(LIBJEMALLOC).$(SO)
+endif
 MAN3 := $(objroot)doc/jemalloc$(install_suffix).3
 DOCS_XML := $(objroot)doc/jemalloc$(install_suffix).xml
 DOCS_HTML := $(DOCS_XML:$(objroot)%.xml=$(srcroot)%.html)
@@ -127,11 +130,13 @@ $(objroot)src/%.pic.$(O): $(srcroot)src/%.c
 	$(CC) $(CFLAGS) -fPIC -DPIC -c $(CPPFLAGS) -o $@ $<
 	@$(CC) -MM $(CPPFLAGS) -MT $@ -o $(@:%.$(O)=%.d) $<
 
-%.$(SO) : %.$(SO).$(REV)
+ifneq ($(SOREV),$(SO))
+%.$(SO) : %.$(SOREV)
 	@mkdir -p $(@D)
 	ln -sf $(<F) $@
+endif
 
-$(objroot)lib/$(LIBJEMALLOC).$(SO).$(REV) : $(CSRCS:$(srcroot)%.c=$(objroot)%.pic.$(O))
+$(objroot)lib/$(LIBJEMALLOC).$(SOREV) : $(CSRCS:$(srcroot)%.c=$(objroot)%.pic.$(O))
 	@mkdir -p $(@D)
 	$(CC) $(DSO_LDFLAGS) $(call RPATH,$(RPATH_EXTRA)) -o $@ $+ $(LDFLAGS) $(LIBS)
 
@@ -175,8 +180,10 @@ done
 
 install_lib_shared: $(DSOS)
 	install -d $(LIBDIR)
-	install -m 755 $(objroot)lib/$(LIBJEMALLOC).$(SO).$(REV) $(LIBDIR)
-	ln -sf $(LIBJEMALLOC).$(SO).$(REV) $(LIBDIR)/$(LIBJEMALLOC).$(SO)
+	install -m 755 $(objroot)lib/$(LIBJEMALLOC).$(SOREV) $(LIBDIR)
+ifneq ($(SOREV),$(SO))
+	ln -sf $(LIBJEMALLOC).$(SOREV) $(LIBDIR)/$(LIBJEMALLOC).$(SO)
+endif
 
 install_lib_static: $(DSOS) $(STATIC_LIBS)
 	install -d $(LIBDIR)

bin/jemalloc.sh.in

@@ -4,6 +4,6 @@ prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 
-@LD_PRELOAD_VAR@=${libdir}/libjemalloc.@so@.@rev@
+@LD_PRELOAD_VAR@=${libdir}/libjemalloc.@SOREV@
 export @LD_PRELOAD_VAR@
 exec "$@"

configure.ac

@@ -201,6 +201,7 @@ exe=
 lib="lib"
 DSO_LDFLAGS='-shared -Wl,-soname,$(@F)'
 RPATH='-Wl,-rpath,$(1)'
+SOREV='$(SO).$(REV)'
 
 dnl Heap profiling uses the log(3) function.
 LIBS="$LIBS -lm"
@@ -223,6 +224,7 @@ case "${host}" in
 	so="dylib"
 	force_tls="0"
 	DSO_LDFLAGS='-shared -Wl,-dylib_install_name,$(@F)'
+	SOREV='$(REV).$(SO)'
 	;;
   *-*-freebsd*)
 	CFLAGS="$CFLAGS"
@@ -284,6 +286,7 @@ AC_SUBST([a])
 AC_SUBST([exe])
 AC_SUBST([lib])
 AC_SUBST([DSO_LDFLAGS])
+AC_SUBST([SOREV])
 
 JE_COMPILABLE([__attribute__ syntax],
               [static __attribute__((unused)) void foo(void){}],