include/freetype/config/public-macros.h

/****************************************************************************
 *
 * config/public-macros.h
 *
 *   Define a set of compiler macros used in public FreeType headers.
 *
 * Copyright (C) 2020 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used,
 * modified, and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 *
 */

/* The definitions in this file are used by the public FreeType headers,
 * and thus should be considered part of the public API.
 *
 * Other compiler-specific macro definitions that are not exposed by the
 * FreeType API should go into include/freetype/internal/compiler-macros.h
 * instead.
 */
#ifndef FREETYPE_CONFIG_PUBLIC_MACROS_H_
#define FREETYPE_CONFIG_PUBLIC_MACROS_H_

/* FT_BEGIN_HEADER and FT_END_HEADER might have already been defined by
 * <freetype/config/ftheader.h>, but we don't want to include this header
 * here, so redefine the macros here only when needed. Their definition is
 * very stable, so keeping them in sync with the ones in the header should
 * not be a maintenance issue.
 */
#ifndef FT_BEGIN_HEADER
#  ifdef __cplusplus
#    define FT_BEGIN_HEADER extern "C" {
#  else
#    define FT_BEGIN_HEADER  /* nothing */
#  endif
#endif  /* FT_END_HEADER */

#ifndef FT_END_HEADER
#  ifdef __cplusplus
#    define FT_END_HEADER  }
#  else
#    define FT_END_HEADER  /* nothing */
#  endif
#endif  /* FT_END_HEADER */

FT_BEGIN_HEADER

/* Mark a function declaration as public. This ensures it will be properly
 * exported to client code. Place this before a function declaration.
 *
 * NOTE: This macro should be considered an internal implementation detail, and
 * not part of the FreeType API. It is only defined here because it is needed
 * by FT_EXPORT()
 */
#if defined(_WIN32)
#  if defined(FT2_BUILD_LIBRARY) && defined( DLL_EXPORT )
#    define FT_PUBLIC_FUNCTION_ATTRIBUTE  __declspec( dllexport )
#  elif defined( DLL_IMPORT )
#    define FT_PUBLIC_FUNCTION_ATTRIBUTE  __declspec( dllimport )
#  endif
#elif (defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)
#  define FT_PUBLIC_FUNCTION_ATTRIBUTE  __attribute__((visibility("default")))
#elif defined(__SUNPRO_C) && __SUNPRO_C >= 0x550
#  define FT_PUBLIC_FUNCTION_ATTRIBUTE __global
#endif

#ifndef FT_PUBLIC_FUNCTION_ATTRIBUTE
#  define FT_PUBLIC_FUNCTION_ATTRIBUTE  /* nothing */
#endif

/* Define a public FreeType API function. This ensures it is properly exported
 * or imported at build time. The macro parameter is the function's return type
 * as in:
 *
 *     FT_EXPORT( FT_Bool )  FT_Object_Method( FT_Object obj, ... );
 *
 */
#ifdef __cplusplus
#define FT_EXPORT( x )  FT_PUBLIC_FUNCTION_ATTRIBUTE extern "C" x
#else
#define FT_EXPORT( x )  FT_PUBLIC_FUNCTION_ATTRIBUTE extern x
#endif

FT_END_HEADER

#endif  /* FREETYPE_CONFIG_PUBLIC_MACROS_H_ */