linux-kernel - [PATCH] kmod: configure.ac: In _Noreturn check, include <stdlib.h> for exit

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Date:   Sat, 17 Dec 2022 17:52:34 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     linux-modules@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] kmod: configure.ac: In _Noreturn check, include <stdlib.h>
 for exit

Otherwise, an implicit functiona declaration is used, causing
a C99 compatibility issue.

Signed-off-by: Florian Weimer <fweimer@...hat.com>

---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 6989e93..12e0518 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,7 +68,8 @@ AC_COMPILE_IFELSE(
 
 AC_MSG_CHECKING([whether _Noreturn is supported])
 AC_COMPILE_IFELSE(
-	[AC_LANG_SOURCE([[_Noreturn int foo(void) { exit(0); }]])],
+	[AC_LANG_SOURCE([[#include <stdlib.h>
+	_Noreturn int foo(void) { exit(0); }]])],
         [AC_DEFINE([HAVE_NORETURN], [1], [Define if _Noreturn is available])
 	 AC_MSG_RESULT([yes])],
 	[AC_MSG_RESULT([no])])

base-commit: 6c5f2f13689e6a4668f87171752d7818bed4b602