From: Ming Chen 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])])