6588413: Use -fvisibility=hidden for gcc compiles
Summary: Add option for gcc 4 and above, define JNIEXPORT and JNIIMPORT to visibility=default, add for jio_snprintf and others since -fvisibility=hidden overrides --version-script definitions.
Reviewed-by: kamg, never
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#if defined(__GNUC__) && (__GNUC__ >= 4)
#define JNIEXPORT __attribute__((visibility("default")))
#define JNIIMPORT __attribute__((visibility("default")))
#else
#define JNIEXPORT
#define JNIIMPORT
#endif
#define JNICALL
typedef int jint;
#ifdef _LP64
typedef long jlong;
#else
typedef long long jlong;
#endif
typedef signed char jbyte;