Move FMT_GCC_VISIBILITY_HIDDEN to format.h

include/fmt/core.h

@@ -247,12 +247,6 @@
 #  define FMT_API
 #endif
 
-#if FMT_GCC_VERSION
-#  define FMT_GCC_VISIBILITY_HIDDEN __attribute__((visibility("hidden")))
-#else
-#  define FMT_GCC_VISIBILITY_HIDDEN
-#endif
-
 // libc++ supports string_view in pre-c++17.
 #if (FMT_HAS_INCLUDE(<string_view>) &&                       \
      (__cplusplus > 201402L || defined(_LIBCPP_VERSION))) || \

include/fmt/format.h

@@ -43,6 +43,12 @@
 
 #include "core.h"
 
+#if FMT_GCC_VERSION
+#  define FMT_GCC_VISIBILITY_HIDDEN __attribute__((visibility("hidden")))
+#else
+#  define FMT_GCC_VISIBILITY_HIDDEN
+#endif
+
 #ifdef __INTEL_COMPILER
 #  define FMT_ICC_VERSION __INTEL_COMPILER
 #elif defined(__ICL)