I can't find any documentation for what JNIEXPORT and friends actually do.
People including myself have been cargo-culting JNIEXPORT and JNICALL for
decades.
Why aren't they in the JNI spec?
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It's fishy that the attribute externally_visible (which seems very
interesting!) is ARM specific.
#ifdef ARM
#define JNIEXPORT
__attribute__((externally_visible,visibility("default")))
#define JNIIMPORT
__attribute__((externally_visible,visibility("default")))
#else
#define JNIEXPORT __attribute__((visibility("default")))
#define JNIIMPORT __attribute__((visibility("default")))
#endif
