From 99fd890fa601b81ff99e5e0f1977fe309f56b90e Mon Sep 17 00:00:00 2001

From: Florian Weimer <fweimer@redhat.com>

Date: Wed, 30 Nov 2022 00:48:49 +0100

Subject: [PATCH] configure: Fix snprintf check for strict(er) C99 compilers

 (#187)

C99 removed support for implicit function declarations. The test calls

the undeclared exit function, so it may fail incorrectly with C99

compilers. Return from main instead to report the test result.

---

 configure.ac | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac

index 56fb1dd44..e115da3ab 100644

--- a/configure.ac

+++ b/configure.ac

@@ -595,7 +595,7 @@ if test "x$ac_cv_func_snprintf" = xyes; then

 	AC_RUN_IFELSE(

 		[AC_LANG_SOURCE([[

 #include <stdio.h>

-int main(void){char b[5];snprintf(b,5,"123456789");exit(b[4]!='\0');}

+int main(void){char b[5];snprintf(b,5,"123456789");return b[4]!='\0';}

 		]])],

 		[AC_MSG_RESULT(yes)],

 		[

-- 

2.33.6