From 8e4fdc1c2794e861cd026864607fa6b04c5237cb Mon Sep 17 00:00:00 2001 From: Eli Schwartz 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 --- 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 ]], [[ extern char *__progname; printf("%s", __progname); ]])], [ ac_cv_libc_defines___progname="yes" ], [ ac_cv_libc_defines___progname="no" -- 2.44.1