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

ngie-eign · benjaminp · commit 90c6facebd56 · 2019-02-25T21:34:24.000-08:00
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.
diff --git a/configure.ac b/configure.ac
@@ -4727,6 +4727,8 @@ 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);

Original file line number	Diff line number	Diff line change
`@@ -4727,6 +4727,8 @@ LIBS=$LIBS_no_readline`
`4727`	`4727`	`AC_MSG_CHECKING(for broken nice())`
`4728`	`4728`	`AC_CACHE_VAL(ac_cv_broken_nice, [`
`4729`	`4729`	`AC_RUN_IFELSE([AC_LANG_SOURCE([[`
	`4730`	`+#include <stdlib.h>`
	`4731`	`+#include <unistd.h>`
`4730`	`4732`	`int main()`
`4731`	`4733`	`{`
`4732`	`4734`	`int val1 = nice(1);`