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configure.ac: fix check for futex and eventfd

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We were using AC_LANG_PROGRAM to build a program to test for our ability
to call syscall (__NR_futex, ...);.  This macro adds "main () { ... }"
around the provided code segment automatically.  The provided code
segment provided its own main() function, however.

The result looked something like:

int main (void) {
  int main (void) {
    ...
  }
}

which worked on GCC, but not on clang.

Let's fix that.  Let's fix the same mistake copied over for eventfd()
detection while we're at it.
This commit is contained in:
Ryan Lortie 2014-06-20 14:43:26 -04:00
parent bef557e55d
commit 9362a1b2d9
1 changed files with 0 additions and 11 deletions
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11
configure.ac
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@ -2386,13 +2386,7 @@ AC_CACHE_CHECK(for futex(2) system call,
#include <sys/syscall.h>
#include <unistd.h>
],[
int
main (void)
{
/* it is not like this actually runs or anything... */
syscall (__NR_futex, NULL, FUTEX_WAKE, FUTEX_WAIT);
return 0;
}
])],glib_cv_futex=yes,glib_cv_futex=no))
if test x"$glib_cv_futex" = xyes; then
AC_DEFINE(HAVE_FUTEX, 1, [we have the futex(2) system call])
@ -2403,12 +2397,7 @@ AC_CACHE_CHECK(for eventfd(2) system call,
#include <sys/eventfd.h>
#include <unistd.h>
],[
int
main (void)
{
eventfd (0, EFD_CLOEXEC);
return 0;
}
])],glib_cv_eventfd=yes,glib_cv_eventfd=no))
if test x"$glib_cv_eventfd" = x"yes"; then
AC_DEFINE(HAVE_EVENTFD, 1, [we have the eventfd(2) system call])