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configure: Avoid exit() when checking for __sync_sub_and_fetch()

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Use of exit() requires a stdlib.h include. This check was failing for me
since the compiler defaulted to -Werror=implicit-function-declaration, so
__sync_sub_and_fetch() support was not dectected.

(cherry picked from commit 56e52a4212)
Backported-from: dbus!320
This commit is contained in:
Alex Richardson 2022-05-25 22:05:03 +00:00 • committed by Simon McVittie
parent 6625f220c4
commit 6d7ec5fc6d
1 changed files with 1 additions and 1 deletions
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2
configure.ac
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@ -613,7 +613,7 @@ AS_IF([test -n "$dbus_va_copy_func"],
AC_CACHE_CHECK([whether $CC knows __sync_sub_and_fetch()],
dbus_cv_sync_sub_and_fetch,
[AC_LINK_IFELSE([
AC_LANG_PROGRAM([[]], [[int a = 4; int b = __sync_sub_and_fetch(&a, 4); exit(b); ]])],
AC_LANG_PROGRAM([[]], [[int a = 4; int b = __sync_sub_and_fetch(&a, 4); return b; ]])],
[dbus_cv_sync_sub_and_fetch=yes],
[dbus_cv_sync_sub_and_fetch=no])
])