From: Mark Wielaard <mark@klomp.org>
Date: Sun, 6 Apr 2025 16:04:10 +0000 (+0200)
Subject: configure: Use AC_CHECK_HEADERS to detect stdatomic.h
X-Git-Tag: elfutils-0.193~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3b71249d4396f742d68e774313c2a2d9caf4d668;p=thirdparty%2Felfutils.git

configure: Use AC_CHECK_HEADERS to detect stdatomic.h

	* configure.ac: Use AC_CHECK_HEADERS instead of
	AC_COMPILE_IFELSE.

Suggested-by: Dmitry V. Levin <ldv@strace.io>
Signed-off-by: Mark Wielaard <mark@klomp.org>
---

diff --git a/configure.ac b/configure.ac
index 1679a17d..27488e3f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -228,11 +228,7 @@ AS_IF([test "x$ac_cv_tls" != xyes],
 
 dnl Although we test for C11 above that doesn't mean we have stdatomic.h
 dnl We need at least gcc 4.9+ for that.
-AC_CACHE_CHECK([whether gcc provides stdatomic.h], ac_cv_has_stdatomic,
-  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <stdatomic.h>]])],
-		     ac_cv_has_stdatomic=yes, ac_cv_has_stdatomic=no)])
-AS_IF([test "x$ac_cv_has_stdatomic" = "xno"],
-      [AC_MSG_ERROR([stdatomic.h required])])
+AC_CHECK_HEADERS([stdatomic.h], [], [AC_MSG_ERROR([stdatomic.h required])])
 
 dnl This test must come as early as possible after the compiler configuration
 dnl tests, because the choice of the file model can (in principle) affect