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* m4: sync autoconf-archive (ax_*) macros with upstreamSam James2022-11-031-6/+27
| | | | | | | | - Update the various ax_* macros (which originate from autoconf-archive) - Switch from acx_pthread.m4 -> ax_pthread.m4 Fixes: https://github.com/mm2/Little-CMS/issues/339 Signed-off-by: Sam James <sam@gentoo.org>
* Only check for visibility attributes that we are using.Thomas Weber2017-10-211-2/+0
| | | | Clang on OSX does not support visibility "protected".
* Revert "revert "-fvisibility=hidden""Thomas Weber2017-10-211-0/+223
| | | | | | | This reverts commit 4ce2fee79c35465b9f182a2e55b7b703a5e60594. Further work on the ax_gcc_func_attribute.m4 will allow this to work on OSX.
* revert "-fvisibility=hidden"Marti Maria2017-10-061-223/+0
| | | | It does not work on OSX
* Check availibility of 'visibility' function attribute in compilerThomas Weber2017-02-021-0/+223
Supported by at least GCC and Clang