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For versions of GCC which support it (≥ 4), define G_MODULE_EXPORT as __attribute__((visibility("default"))). This is normally a no-op, unless compiling with -fvisibility=hidden, in which case it marks a symbol to be publicly exported from the library, which is what G_MODULE_EXPORT is for. Previously G_MODULE_EXPORT has only worked on Windows. The compatibility check for whether the compiler supports __attribute__((visibility)) is based on the __GNUC__ define, and is similar to the check done in configure.ac for defining G_GNUC_INTERNAL. Signed-off-by: Philip Withnall <withnall@endlessm.com> https://bugzilla.gnome.org/show_bug.cgi?id=778287