libs/fluidsynth_lite/cmake_admin/CheckDIRSymbolExists.cmake

   1 # - Check if the DIR symbol exists like in AC_HEADER_DIRENT.\r
   2 # CHECK_DIRSYMBOL_EXISTS(FILES VARIABLE)\r
   3 #\r
   4 #  FILES    - include files to check\r
   5 #  VARIABLE - variable to return result\r
   6 #\r
   7 # This module is a small but important variation on CheckSymbolExists.cmake.\r
   8 # The symbol always searched for is DIR, and the test programme follows\r
   9 # the AC_HEADER_DIRENT test programme rather than the CheckSymbolExists.cmake\r
  10 # test programme which always fails since DIR tends to be typedef'd\r
  11 # rather than #define'd.\r
  12 # \r
  13 # The following variables may be set before calling this macro to\r
  14 # modify the way the check is run:\r
  15 #\r
  16 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags\r
  17 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)\r
  18 #  CMAKE_REQUIRED_INCLUDES = list of include directories\r
  19 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link\r
  20 \r
  21 MACRO(CHECK_DIRSYMBOL_EXISTS FILES VARIABLE)\r
  22   IF(NOT DEFINED ${VARIABLE})\r
  23     SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")\r
  24     SET(MACRO_CHECK_DIRSYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})\r
  25     IF(CMAKE_REQUIRED_LIBRARIES)\r
  26       SET(CHECK_DIRSYMBOL_EXISTS_LIBS \r
  27         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")\r
  28     ELSE(CMAKE_REQUIRED_LIBRARIES)\r
  29       SET(CHECK_DIRSYMBOL_EXISTS_LIBS)\r
  30     ENDIF(CMAKE_REQUIRED_LIBRARIES)\r
  31     IF(CMAKE_REQUIRED_INCLUDES)\r
  32       SET(CMAKE_DIRSYMBOL_EXISTS_INCLUDES\r
  33         "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")\r
  34     ELSE(CMAKE_REQUIRED_INCLUDES)\r
  35       SET(CMAKE_DIRSYMBOL_EXISTS_INCLUDES)\r
  36     ENDIF(CMAKE_REQUIRED_INCLUDES)\r
  37     FOREACH(FILE ${FILES})\r
  38       SET(CMAKE_CONFIGURABLE_FILE_CONTENT\r
  39         "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")\r
  40     ENDFOREACH(FILE)\r
  41     SET(CMAKE_CONFIGURABLE_FILE_CONTENT\r
  42       "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nint main()\n{if ((DIR *) 0) return 0;}\n")\r
  43 \r
  44     CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"\r
  45       "${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c" @ONLY)\r
  46 \r
  47     MESSAGE(STATUS "Looking for DIR in ${FILES}")\r
  48     TRY_COMPILE(${VARIABLE}\r
  49       ${CMAKE_BINARY_DIR}\r
  50       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c\r
  51       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}\r
  52       CMAKE_FLAGS \r
  53       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_DIRSYMBOL_EXISTS_FLAGS}\r
  54       "${CHECK_DIRSYMBOL_EXISTS_LIBS}"\r
  55       "${CMAKE_DIRSYMBOL_EXISTS_INCLUDES}"\r
  56       OUTPUT_VARIABLE OUTPUT)\r
  57     IF(${VARIABLE})\r
  58       MESSAGE(STATUS "Looking for DIR in ${FILES} - found")\r
  59       SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol DIR")\r
  60       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log \r
  61         "Determining if the DIR symbol is defined as in AC_HEADER_DIRENT "\r
  62         "passed with the following output:\n"\r
  63         "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c:\n"\r
  64         "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")\r
  65     ELSE(${VARIABLE})\r
  66       MESSAGE(STATUS "Looking for DIR in ${FILES} - not found.")\r
  67       SET(${VARIABLE} "" CACHE INTERNAL "Have symbol DIR")\r
  68       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log \r
  69         "Determining if the DIR symbol is defined as in AC_HEADER_DIRENT "\r
  70         "failed with the following output:\n"\r
  71         "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c:\n"\r
  72         "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")\r
  73     ENDIF(${VARIABLE})\r
  74   ENDIF(NOT DEFINED ${VARIABLE})\r
  75 ENDMACRO(CHECK_DIRSYMBOL_EXISTS)\r