Manage FreeType symbol visibility using platform specific FT_EXPORT

third_party/freetype/include/freetype-custom-config/ftoption.h

 /***************************************************************************/
 /*                                                                         */
 /*  ftoption.h                                                             */
 /*                                                                         */
 /*    User-selectable configuration macros (specification only).           */
 /*                                                                         */
 /*  Copyright 1996-2017 by                                                 */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
@@ skipping 291 matching lines @@
   /*         }                                                             */
   /*                                                                       */
   /*   You can provide your own implementation of FT_EXPORT and            */
   /*   FT_EXPORT_DEF here if you want.  If you leave them undefined, they  */
   /*   will be later automatically defined as `extern return_type' to      */
   /*   allow normal compilation.                                           */
   /*                                                                       */
   /*   Do not #undef these macros here since the build system might define */
   /*   them for certain configurations only.                               */
   /*                                                                       */
-/* #define FT_EXPORT(x)      extern x */
-/* #define FT_EXPORT_DEF(x)  x */
 
+#if defined(_WIN32)
+
+#if defined(FT2_BUILD_DLL)
+#if defined(FT2_BUILD_LIBRARY)
+#define FT_EXPORT(x)     __declspec(dllexport) x
+#define FT_EXPORT_DEF(x) __declspec(dllexport) x
+#else
+#define FT_EXPORT(x)     __declspec(dllimport) x
+#define FT_EXPORT_DEF(x) __declspec(dllimport) x
+#endif
+#endif
+
+#else
+#define FT_EXPORT(x)     __attribute__((visibility ("default"))) x
+#define FT_EXPORT_DEF(x) __attribute__((visibility ("default"))) x
+#endif
 
   /*************************************************************************/
   /*                                                                       */
   /* Glyph Postscript Names handling                                       */
   /*                                                                       */
   /*   By default, FreeType 2 is compiled with the `psnames' module.  This */
   /*   module is in charge of converting a glyph name string into a        */
   /*   Unicode value, or return a Macintosh standard glyph name for the    */
   /*   use with the TrueType `post' table.                                 */
   /*                                                                       */
@@ skipping 635 matching lines @@
 #error "Invalid CFF darkening parameters!"
 #endif
 
 FT_END_HEADER
 
 
 #endif /* FTOPTION_H_ */
 
 
 /* END */