closes bpo-13497: Fix `broken nice` configure test. (GH-12041)

Per POSIX, `nice(3)` requires `unistd.h` and `exit(3)` requires `stdlib.h`.

Fixing the test will prevent false positives with pedantic compilers like clang.
(cherry picked from commit 90c6facebd5666fec85f125ee2795b48b30319a4)

Co-authored-by: ngie-eign <1574099+ngie-eign@users.noreply.github.com>

diff --git a/configure.ac b/configure.ac
index 788c361ffeeb26814eac811ef55b9dfb619736ff..ad0f4d42b4b5817747707dd7d0343e939548d82d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -4890,6 +4890,8 @@ LIBS=$LIBS_no_readline
 AC_MSG_CHECKING(for broken nice())
 AC_CACHE_VAL(ac_cv_broken_nice, [
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <unistd.h>
 int main()
 {
        int val1 = nice(1);