cmake HAVE_EXTERNAL_VISIBILITY examples

cmake HAVE_EXTERNAL_VISIBILITY examples

mmontag/chip-player-js libxmp/cmake/libxmp-checks.cmake :178

check_c_source_compiles("__attribute__((visibility(\"default\"),externally_visible)) int foo(void);
                             int foo (void) { return 0; }
                             int main(void) { return 0; }" HAVE_EXTERNAL_VISIBILITY)

mmontag/chip-player-js libxmp/cmake/libxmp-checks.cmake :194

list(APPEND LIBXMP_DEFINES -DHAVE_EXTERNAL_VISIBILITY)