buildroot/package/bcusdk/0003-m4-ccforbuild.m4-include-stdlib.h-in-test-program.patch

From 1c78aa3541f730e9624504168fb0e1f413e5cbb8 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Fri, 2 Aug 2024 19:28:36 +0200
Subject: [PATCH] m4/ccforbuild.m4: include <stdlib.h> in test program

The GMP_PROG_CC_FOR_BUILD_WORKS and GMP_PROG_EXEEXT_FOR_BUILD macros
do various checks to verify if the host compiler works, but their test
programs lack the inclusion of <stdlib.h>, needed for exit(). This
causes a build failure with gcc 14.x:

conftest.c: In function 'main':
conftest.c:4:3: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
    4 |   exit(0);

which then causes the configure script to think that the host compiler
does not work:

configure: error: Specified CC_FOR_BUILD doesn't seem to work

so let's include <stdlib.h> to fix this issue.

Upstream: https://sourceforge.net/p/bcusdk/patches/4/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 m4/ccforbuild.m4 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/m4/ccforbuild.m4 b/m4/ccforbuild.m4
index a466cab..389deaa 100644
--- a/m4/ccforbuild.m4
+++ b/m4/ccforbuild.m4
@@ -66,6 +66,7 @@ AC_DEFUN([GMP_PROG_CC_FOR_BUILD_WORKS],
 # remove anything that might look like compiler output to our "||" expression
 rm -f conftest* a.out b.out a.exe a_out.exe
 cat >conftest.c <<EOF
+#include <stdlib.h>
 int
 main ()
 {
@@ -140,6 +141,7 @@ AC_DEFUN([GMP_PROG_EXEEXT_FOR_BUILD],
 AC_CACHE_CHECK([for build system executable suffix],
                gmp_cv_prog_exeext_for_build,
 [cat >conftest.c <<EOF
+#include <stdlib.h>
 int
 main ()
 {
-- 
2.45.2