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https://github.com/swig/swig/pull/2483
From 784dfc917e99429bdbb70fb9dd80c16dfeb73659 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 12 Jan 2023 17:49:40 +0100
Subject: [PATCH] CCache: Do not rely on C89-only features in configure.ac
Add missing #include directives to obtain additional function
prototypes. This avoids altering the result of this test with C99
compilers which do not support implicit function declarations.
--- a/CCache/configure.ac
+++ b/CCache/configure.ac
@@ -63,6 +63,9 @@ AC_CACHE_CHECK([for C99 vsnprintf],ccache_cv_HAVE_C99_VSNPRINTF,[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
void foo(const char *format, ...) {
va_list ap;
int len;
@@ -77,7 +80,7 @@ void foo(const char *format, ...) {
exit(0);
}
-main() { foo("hello"); }
+int main(void) { foo("hello"); }
]])],[ccache_cv_HAVE_C99_VSNPRINTF=yes],[ccache_cv_HAVE_C99_VSNPRINTF=no],[ccache_cv_HAVE_C99_VSNPRINTF=cross])])
if test x"$ccache_cv_HAVE_C99_VSNPRINTF" = x"yes"; then
AC_DEFINE(HAVE_C99_VSNPRINTF, 1, [ ])
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