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Athos Ribeiro
813d942bac
As described in autoconf-archive upstream [1], from where `build/ax_gcc_func_attribute.m4` is forked, the old unknown func attr detection method would throw a false negative anytime an unrelated warning was raised. This results in `ax_cv_have_func_attribute_target` being set to `no` whenever certain compiler Warning flags are switched on. Namely, having `-Wall` on, which is a default CFLAG for some linux distributions, will result in ``` warning: ‘bar’ declared ‘static’ but never defined [-Wunused-function] ``` when evaluating support for the `target` function attribute. With that configuration value set to `no`, the compiled php binaries will not support x86_64 v3 instructions such as avx2 and sse2, which should speed up specific tasks ran by PHP. This issue was originally reported in Ubuntu [2]. [1] http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commitdiff;h=df0894ad1a8195df67a52108b931e07d708cec9a [2] https://bugs.launchpad.net/ubuntu/+source/php8.1/+bug/1882279 Closes GH-8483.