CMakeCXXInformation.cmake 10 KB

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  1. #=============================================================================
  2. # Copyright 2004-2011 Kitware, Inc.
  3. #
  4. # Distributed under the OSI-approved BSD License (the "License");
  5. # see accompanying file Copyright.txt for details.
  6. #
  7. # This software is distributed WITHOUT ANY WARRANTY; without even the
  8. # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  9. # See the License for more information.
  10. #=============================================================================
  11. # (To distribute this file outside of CMake, substitute the full
  12. # License text for the above reference.)
  13. # This file sets the basic flags for the C++ language in CMake.
  14. # It also loads the available platform file for the system-compiler
  15. # if it exists.
  16. # It also loads a system - compiler - processor (or target hardware)
  17. # specific file, which is mainly useful for crosscompiling and embedded systems.
  18. include(CMakeLanguageInformation)
  19. # some compilers use different extensions (e.g. sdcc uses .rel)
  20. # so set the extension here first so it can be overridden by the compiler specific file
  21. if(UNIX)
  22. set(CMAKE_CXX_OUTPUT_EXTENSION .o)
  23. else()
  24. set(CMAKE_CXX_OUTPUT_EXTENSION .obj)
  25. endif()
  26. set(_INCLUDED_FILE 0)
  27. # Load compiler-specific information.
  28. if(CMAKE_CXX_COMPILER_ID)
  29. include(Compiler/${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL)
  30. endif()
  31. set(CMAKE_BASE_NAME)
  32. get_filename_component(CMAKE_BASE_NAME "${CMAKE_CXX_COMPILER}" NAME_WE)
  33. # since the gnu compiler has several names force g++
  34. if(CMAKE_COMPILER_IS_GNUCXX)
  35. set(CMAKE_BASE_NAME g++)
  36. endif()
  37. # load a hardware specific file, mostly useful for embedded compilers
  38. if(CMAKE_SYSTEM_PROCESSOR)
  39. if(CMAKE_CXX_COMPILER_ID)
  40. include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
  41. endif()
  42. if (NOT _INCLUDED_FILE)
  43. include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
  44. endif ()
  45. endif()
  46. # load the system- and compiler specific files
  47. if(CMAKE_CXX_COMPILER_ID)
  48. include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
  49. endif()
  50. if (NOT _INCLUDED_FILE)
  51. include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL
  52. RESULT_VARIABLE _INCLUDED_FILE)
  53. endif ()
  54. # load any compiler-wrapper specific information
  55. if (CMAKE_CXX_COMPILER_WRAPPER)
  56. __cmake_include_compiler_wrapper(CXX)
  57. endif ()
  58. # We specify the compiler information in the system file for some
  59. # platforms, but this language may not have been enabled when the file
  60. # was first included. Include it again to get the language info.
  61. # Remove this when all compiler info is removed from system files.
  62. if (NOT _INCLUDED_FILE)
  63. include(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
  64. endif ()
  65. if(CMAKE_CXX_SIZEOF_DATA_PTR)
  66. foreach(f ${CMAKE_CXX_ABI_FILES})
  67. include(${f})
  68. endforeach()
  69. unset(CMAKE_CXX_ABI_FILES)
  70. endif()
  71. # This should be included before the _INIT variables are
  72. # used to initialize the cache. Since the rule variables
  73. # have if blocks on them, users can still define them here.
  74. # But, it should still be after the platform file so changes can
  75. # be made to those values.
  76. if(CMAKE_USER_MAKE_RULES_OVERRIDE)
  77. # Save the full path of the file so try_compile can use it.
  78. include(${CMAKE_USER_MAKE_RULES_OVERRIDE} RESULT_VARIABLE _override)
  79. set(CMAKE_USER_MAKE_RULES_OVERRIDE "${_override}")
  80. endif()
  81. if(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX)
  82. # Save the full path of the file so try_compile can use it.
  83. include(${CMAKE_USER_MAKE_RULES_OVERRIDE_CXX} RESULT_VARIABLE _override)
  84. set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX "${_override}")
  85. endif()
  86. # Create a set of shared library variable specific to C++
  87. # For 90% of the systems, these are the same flags as the C versions
  88. # so if these are not set just copy the flags from the c version
  89. if(NOT CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS)
  90. set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
  91. endif()
  92. if(NOT CMAKE_CXX_COMPILE_OPTIONS_PIC)
  93. set(CMAKE_CXX_COMPILE_OPTIONS_PIC ${CMAKE_C_COMPILE_OPTIONS_PIC})
  94. endif()
  95. if(NOT CMAKE_CXX_COMPILE_OPTIONS_PIE)
  96. set(CMAKE_CXX_COMPILE_OPTIONS_PIE ${CMAKE_C_COMPILE_OPTIONS_PIE})
  97. endif()
  98. if(NOT CMAKE_CXX_COMPILE_OPTIONS_DLL)
  99. set(CMAKE_CXX_COMPILE_OPTIONS_DLL ${CMAKE_C_COMPILE_OPTIONS_DLL})
  100. endif()
  101. if(NOT CMAKE_SHARED_LIBRARY_CXX_FLAGS)
  102. set(CMAKE_SHARED_LIBRARY_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
  103. endif()
  104. if(NOT DEFINED CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
  105. set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS})
  106. endif()
  107. if(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG)
  108. set(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG})
  109. endif()
  110. if(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP)
  111. set(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP})
  112. endif()
  113. if(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG)
  114. set(CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG})
  115. endif()
  116. if(NOT DEFINED CMAKE_EXE_EXPORTS_CXX_FLAG)
  117. set(CMAKE_EXE_EXPORTS_CXX_FLAG ${CMAKE_EXE_EXPORTS_C_FLAG})
  118. endif()
  119. if(NOT DEFINED CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG)
  120. set(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_SONAME_C_FLAG})
  121. endif()
  122. if(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG)
  123. set(CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG})
  124. endif()
  125. if(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG_SEP)
  126. set(CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP})
  127. endif()
  128. if(NOT CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG)
  129. set(CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG})
  130. endif()
  131. if(NOT DEFINED CMAKE_SHARED_LIBRARY_LINK_CXX_WITH_RUNTIME_PATH)
  132. set(CMAKE_SHARED_LIBRARY_LINK_CXX_WITH_RUNTIME_PATH ${CMAKE_SHARED_LIBRARY_LINK_C_WITH_RUNTIME_PATH})
  133. endif()
  134. if(NOT CMAKE_INCLUDE_FLAG_CXX)
  135. set(CMAKE_INCLUDE_FLAG_CXX ${CMAKE_INCLUDE_FLAG_C})
  136. endif()
  137. if(NOT CMAKE_INCLUDE_FLAG_SEP_CXX)
  138. set(CMAKE_INCLUDE_FLAG_SEP_CXX ${CMAKE_INCLUDE_FLAG_SEP_C})
  139. endif()
  140. # for most systems a module is the same as a shared library
  141. # so unless the variable CMAKE_MODULE_EXISTS is set just
  142. # copy the values from the LIBRARY variables
  143. if(NOT CMAKE_MODULE_EXISTS)
  144. set(CMAKE_SHARED_MODULE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CXX_FLAGS})
  145. set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS})
  146. endif()
  147. # repeat for modules
  148. if(NOT CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS)
  149. set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS ${CMAKE_SHARED_MODULE_CREATE_C_FLAGS})
  150. endif()
  151. if(NOT CMAKE_SHARED_MODULE_CXX_FLAGS)
  152. set(CMAKE_SHARED_MODULE_CXX_FLAGS ${CMAKE_SHARED_MODULE_C_FLAGS})
  153. endif()
  154. # Initialize CXX link type selection flags from C versions.
  155. foreach(type SHARED_LIBRARY SHARED_MODULE EXE)
  156. if(NOT CMAKE_${type}_LINK_STATIC_CXX_FLAGS)
  157. set(CMAKE_${type}_LINK_STATIC_CXX_FLAGS
  158. ${CMAKE_${type}_LINK_STATIC_C_FLAGS})
  159. endif()
  160. if(NOT CMAKE_${type}_LINK_DYNAMIC_CXX_FLAGS)
  161. set(CMAKE_${type}_LINK_DYNAMIC_CXX_FLAGS
  162. ${CMAKE_${type}_LINK_DYNAMIC_C_FLAGS})
  163. endif()
  164. endforeach()
  165. # add the flags to the cache based
  166. # on the initial values computed in the platform/*.cmake files
  167. # use _INIT variables so that this only happens the first time
  168. # and you can set these flags in the cmake cache
  169. set(CMAKE_CXX_FLAGS_INIT "$ENV{CXXFLAGS} ${CMAKE_CXX_FLAGS_INIT}")
  170. # avoid just having a space as the initial value for the cache
  171. if(CMAKE_CXX_FLAGS_INIT STREQUAL " ")
  172. set(CMAKE_CXX_FLAGS_INIT)
  173. endif()
  174. set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_INIT}" CACHE STRING
  175. "Flags used by the compiler during all build types.")
  176. if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
  177. set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG_INIT}" CACHE STRING
  178. "Flags used by the compiler during debug builds.")
  179. set (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL_INIT}" CACHE STRING
  180. "Flags used by the compiler during release builds for minimum size.")
  181. set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE_INIT}" CACHE STRING
  182. "Flags used by the compiler during release builds.")
  183. set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
  184. "Flags used by the compiler during release builds with debug info.")
  185. endif()
  186. if(CMAKE_CXX_STANDARD_LIBRARIES_INIT)
  187. set(CMAKE_CXX_STANDARD_LIBRARIES "${CMAKE_CXX_STANDARD_LIBRARIES_INIT}"
  188. CACHE STRING "Libraries linked by default with all C++ applications.")
  189. mark_as_advanced(CMAKE_CXX_STANDARD_LIBRARIES)
  190. endif()
  191. include(CMakeCommonLanguageInclude)
  192. # now define the following rules:
  193. # CMAKE_CXX_CREATE_SHARED_LIBRARY
  194. # CMAKE_CXX_CREATE_SHARED_MODULE
  195. # CMAKE_CXX_COMPILE_OBJECT
  196. # CMAKE_CXX_LINK_EXECUTABLE
  197. # variables supplied by the generator at use time
  198. # <TARGET>
  199. # <TARGET_BASE> the target without the suffix
  200. # <OBJECTS>
  201. # <OBJECT>
  202. # <LINK_LIBRARIES>
  203. # <FLAGS>
  204. # <LINK_FLAGS>
  205. # CXX compiler information
  206. # <CMAKE_CXX_COMPILER>
  207. # <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS>
  208. # <CMAKE_CXX_SHARED_MODULE_CREATE_FLAGS>
  209. # <CMAKE_CXX_LINK_FLAGS>
  210. # Static library tools
  211. # <CMAKE_AR>
  212. # <CMAKE_RANLIB>
  213. # create a shared C++ library
  214. if(NOT CMAKE_CXX_CREATE_SHARED_LIBRARY)
  215. set(CMAKE_CXX_CREATE_SHARED_LIBRARY
  216. "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
  217. endif()
  218. # create a c++ shared module copy the shared library rule by default
  219. if(NOT CMAKE_CXX_CREATE_SHARED_MODULE)
  220. set(CMAKE_CXX_CREATE_SHARED_MODULE ${CMAKE_CXX_CREATE_SHARED_LIBRARY})
  221. endif()
  222. # Create a static archive incrementally for large object file counts.
  223. # If CMAKE_CXX_CREATE_STATIC_LIBRARY is set it will override these.
  224. if(NOT DEFINED CMAKE_CXX_ARCHIVE_CREATE)
  225. set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> qc <TARGET> <LINK_FLAGS> <OBJECTS>")
  226. endif()
  227. if(NOT DEFINED CMAKE_CXX_ARCHIVE_APPEND)
  228. set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> q <TARGET> <LINK_FLAGS> <OBJECTS>")
  229. endif()
  230. if(NOT DEFINED CMAKE_CXX_ARCHIVE_FINISH)
  231. set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> <TARGET>")
  232. endif()
  233. # compile a C++ file into an object file
  234. if(NOT CMAKE_CXX_COMPILE_OBJECT)
  235. set(CMAKE_CXX_COMPILE_OBJECT
  236. "<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")
  237. endif()
  238. if(NOT CMAKE_CXX_LINK_EXECUTABLE)
  239. set(CMAKE_CXX_LINK_EXECUTABLE
  240. "<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
  241. endif()
  242. mark_as_advanced(
  243. CMAKE_VERBOSE_MAKEFILE
  244. CMAKE_CXX_FLAGS
  245. CMAKE_CXX_FLAGS_RELEASE
  246. CMAKE_CXX_FLAGS_RELWITHDEBINFO
  247. CMAKE_CXX_FLAGS_MINSIZEREL
  248. CMAKE_CXX_FLAGS_DEBUG)
  249. set(CMAKE_CXX_INFORMATION_LOADED 1)