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From 8e4fdc1c2794e861cd026864607fa6b04c5237cb Mon Sep 17 00:00:00 2001
From: Eli Schwartz <eschwartz93@gmail.com>
Date: Tue, 21 May 2024 16:10:45 -0400
Subject: [PATCH] fix incompatible check for libc compat
It relied on implicit function declarations, which are banned starting
in c99. Result: the check always failed.
See: https://wiki.gentoo.org/wiki/Modern_C_porting#How_do_I_reproduce_these_bugs.3F
Bug: https://bugs.gentoo.org/900296
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
---
m4/check-libc-compat.m4 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/m4/check-libc-compat.m4 b/m4/check-libc-compat.m4
index a806cbe..3bb859a 100644
--- a/m4/check-libc-compat.m4
+++ b/m4/check-libc-compat.m4
@@ -1,6 +1,6 @@
AC_DEFUN([CHECK_PROGNAME], [
AC_CACHE_CHECK([if libc defines __progname], ac_cv_libc_defines___progname, [
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
[[ extern char *__progname; printf("%s", __progname); ]])],
[ ac_cv_libc_defines___progname="yes" ],
[ ac_cv_libc_defines___progname="no"
--
2.44.1
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