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From: Ming Chen <ming.chen1986@gmail.com>
Date: Mon, 2 Mar 2020 09:40:36 +0800
Subject: ax_gcc_func_attribute: Revise the detection of unknown attributes
GCC outputs a warning when Wstrict-prototypes is on, in such case the
attribute detection always fails even if the attribute is actually
supported. This change checks for the "-Wattributes" warning in
conftest.err instead of the existence of the file.
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/php8.1/+bug/1882279
Forwarded: https://github.com/php/php-src/pull/8483
Origin: http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commitdiff;h=df0894ad1a8195df67a52108b931e07d708cec9a
Last-Update: 2022-05-02
---
build/ax_gcc_func_attribute.m4 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/build/ax_gcc_func_attribute.m4 b/build/ax_gcc_func_attribute.m4
index 79f3eef..4633093 100644
--- a/build/ax_gcc_func_attribute.m4
+++ b/build/ax_gcc_func_attribute.m4
@@ -227,7 +227,7 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
dnl GCC doesn't exit with an error if an unknown attribute is
dnl provided but only outputs a warning, so accept the attribute
dnl only if no warning were issued.
- [AS_IF([test -s conftest.err],
+ [AS_IF([grep -- -Wattributes conftest.err],
[AS_VAR_SET([ac_var], [no])],
[AS_VAR_SET([ac_var], [yes])])],
[AS_VAR_SET([ac_var], [no])])
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