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LRN authored
Accurate G_HAVE_GNUC_VISIBILITY is needed to correctly define G_GNUC_INTERNAL later on. Autotools did that, meson currently doesn't and opts to just set G_HAVE_GNUC_VISIBILITY to 1 for all compilers except MSVC. This leads to MinGW GCC having G_HAVE_GNUC_VISIBILITY=1, which results in G_GNUC_INTERNAL being defined to __attribute__((visibility("hidden"))), which is not supported. Because cc.compiles() does not support override_options or anything like that, we just feed it '-Werror' as-is, since MSVC is known as not supporting visibility attributes anyway. https://bugzilla.gnome.org/show_bug.cgi?id=794636
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