c3-lang/libmd/src/local-link.h

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• Hash : 6b3f9f75
  Author :
  Date : 2021-01-02T16:26:38
  

  build: Provide wrapper functions instead of aliases in DLL built with MSVC On Windows we cannot use proper aliases, and using the /EXPORT linker flag is too cumbersome, as it does not work when static linking, and when dynamic linking it does not make the aliases visible within the DLL itself. Just use normal function wrapper in those cases, which are way more maintainable.

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• src/local-link.h

• /*
   * Copyright © 2015, 2019 Guillem Jover <guillem@hadrons.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
   * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef LIBMD_LOCAL_LINK_H
  #define LIBMD_LOCAL_LINK_H
  
  #define libmd_link_warning(symbol, msg) \
  	static const char libmd_emit_link_warning_##symbol[] \
  		__attribute__((__used__,__section__(".gnu.warning." #symbol))) = msg;
  
  /*
   * On Windows we cannot use proper aliases, and using the /EXPORT linker flag
   * is too cumbersome, as it does not work when static linking, and when
   * dynamic linking it does not make the aliases visible within the DLL itself.
   *
   * Instead we use normal function wrapper in those cases, which are way more
   * maintainable.
   */
  #ifndef _MSC_VER
  #define libmd_alias(alias, symbol) \
  	extern __typeof(symbol) alias __attribute__((__alias__(#symbol)))
  #endif
  
  #ifdef __ELF__
  #define libmd_symver_default(alias, symbol, version) \
  	__asm__(".symver " #symbol "," #alias "@@" #version)
  
  #define libmd_symver_variant(alias, symbol, version) \
  	__asm__(".symver " #symbol "," #alias "@" #version)
  #else
  #define libmd_symver_default(alias, symbol, version) \
  	extern __typeof(symbol) alias __attribute__((__alias__(#symbol)))
  
  #define libmd_symver_variant(alias, symbol, version)
  #endif
  
  #endif
  

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