thodg/libgit2/cmake/Modules/CheckPrototypeDefinition.cmake

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• Hash : 1a9cc182
  Author :
  Date : 2018-08-17T15:56:30
  

  util: make the qsort_r check work on macOS This performs a compile-check by using CMake support, to differentiate the GNU version from the BSD version of qsort_r. Module taken from 4f252abea5f1d17c60f6ff115c9c44cc0b6f1df6, which I've checked against CMake 2.8.11.

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• cmake/Modules/CheckPrototypeDefinition.cmake

• # - Check if the protoype we expect is correct.
  # check_prototype_definition(FUNCTION PROTOTYPE RETURN HEADER VARIABLE)
  #  FUNCTION - The name of the function (used to check if prototype exists)
  #  PROTOTYPE- The prototype to check.
  #  RETURN - The return value of the function.
  #  HEADER - The header files required.
  #  VARIABLE - The variable to store the result.
  # Example:
  #  check_prototype_definition(getpwent_r
  #   "struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"
  #   "NULL"
  #   "unistd.h;pwd.h"
  #   SOLARIS_GETPWENT_R)
  # The following variables may be set before calling this macro to
  # modify the way the check is run:
  #
  #  CMAKE_REQUIRED_FLAGS = string of compile command line flags
  #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
  #  CMAKE_REQUIRED_INCLUDES = list of include directories
  #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
  
  #=============================================================================
  # Copyright 2005-2009 Kitware, Inc.
  # Copyright 2010-2011 Andreas Schneider <asn@cryptomilk.org>
  #
  # Distributed under the OSI-approved BSD License (the "License");
  # see accompanying file Copyright.txt for details.
  #
  # This software is distributed WITHOUT ANY WARRANTY; without even the
  # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  # See the License for more information.
  #=============================================================================
  # (To distribute this file outside of CMake, substitute the full
  #  License text for the above reference.)
  #
  
  get_filename_component(__check_proto_def_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
  
  function(CHECK_PROTOTYPE_DEFINITION _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
  
    if ("${_VARIABLE}" MATCHES "^${_VARIABLE}$")
      set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
  
      set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
      if (CMAKE_REQUIRED_LIBRARIES)
        set(CHECK_PROTOTYPE_DEFINITION_LIBS
          "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
      else(CMAKE_REQUIRED_LIBRARIES)
        set(CHECK_PROTOTYPE_DEFINITION_LIBS)
      endif(CMAKE_REQUIRED_LIBRARIES)
      if (CMAKE_REQUIRED_INCLUDES)
        set(CMAKE_SYMBOL_EXISTS_INCLUDES
          "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
      else(CMAKE_REQUIRED_INCLUDES)
        set(CMAKE_SYMBOL_EXISTS_INCLUDES)
      endif(CMAKE_REQUIRED_INCLUDES)
  
      foreach(_FILE ${_HEADER})
        set(CHECK_PROTOTYPE_DEFINITION_HEADER
          "${CHECK_PROTOTYPE_DEFINITION_HEADER}#include <${_FILE}>\n")
      endforeach(_FILE)
  
      set(CHECK_PROTOTYPE_DEFINITION_SYMBOL ${_FUNCTION})
      set(CHECK_PROTOTYPE_DEFINITION_PROTO ${_PROTOTYPE})
      set(CHECK_PROTOTYPE_DEFINITION_RETURN ${_RETURN})
  
      configure_file("${__check_proto_def_dir}/CheckPrototypeDefinition.c.in"
        "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c" @ONLY)
  
      file(READ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c _SOURCE)
  
      try_compile(${_VARIABLE}
        ${CMAKE_BINARY_DIR}
        ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c
        COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
        CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
        "${CHECK_PROTOTYPE_DEFINITION_LIBS}"
        "${CMAKE_SYMBOL_EXISTS_INCLUDES}"
        OUTPUT_VARIABLE OUTPUT)
  
      if (${_VARIABLE})
        set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
        message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - True")
        file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
          "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} passed with the following output:\n"
          "${OUTPUT}\n\n")
      else (${_VARIABLE})
        message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - False")
        set(${_VARIABLE} 0 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
        file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
          "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} failed with the following output:\n"
          "${OUTPUT}\n\n${_SOURCE}\n\n")
      endif (${_VARIABLE})
    endif("${_VARIABLE}" MATCHES "^${_VARIABLE}$")
  
  endfunction(CHECK_PROTOTYPE_DEFINITION)
  

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