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Improve configure tests for ffsl

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In particular:
- ffsl always returns int, not long, on FreeBSD, Linux, and OSX.
- Mute compiler warnings about rv being unused (and the potential for
   compilers optimizing out the call completely) by dumping the value
   with printf(3).

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
This commit is contained in:
Garrett Cooper 2012-12-02 17:57:28 -08:00 committed by Jason Evans
parent 6e6164ae15
commit 72c1e59fd2
1 changed files with 4 additions and 2 deletions
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6
configure.ac
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@ -928,7 +928,7 @@ AC_CACHE_CHECK([STATIC_PAGE_SHIFT],
#include <stdio.h>
]],
[[
long result;
int result;
FILE *f;
#ifdef _WIN32
@ -947,7 +947,7 @@ AC_CACHE_CHECK([STATIC_PAGE_SHIFT],
if (f == NULL) {
return 1;
}
fprintf(f, "%u\n", result);
fprintf(f, "%d\n", result);
fclose(f);
return 0;
@ -1092,11 +1092,13 @@ dnl Check for ffsl(3), and fail if not found. This function exists on all
dnl platforms that jemalloc currently has a chance of functioning on without
dnl modification.
JE_COMPILABLE([a program using ffsl], [
#include <stdio.h>
#include <strings.h>
#include <string.h>
], [
{
int rv = ffsl(0x08);
printf("%d\n", rv);
}
], [je_cv_function_ffsl])
if test "x${je_cv_function_ffsl}" != "xyes" ; then