1# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
2# file Copyright.txt or https://cmake.org/licensing for details.
3
4
5# This file is included by CMakeFindEclipseCDT4.cmake and CMakeFindCodeBlocks.cmake
6
7# The Eclipse and the CodeBlocks generators need to know the standard include path
8# so that they can find the headers at runtime and parsing etc. works better
9# This is done here by actually running gcc with the options so it prints its
10# system include directories, which are parsed then and stored in the cache.
11macro(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _resultIncludeDirs _resultDefines)
12  set(${_resultIncludeDirs})
13  set(_gccOutput)
14  file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n" )
15
16  if (${_lang} STREQUAL "c++")
17    set(_compilerExecutable "${CMAKE_CXX_COMPILER}")
18    set(_arg1 "${CMAKE_CXX_COMPILER_ARG1}")
19
20    if (CMAKE_CXX_FLAGS MATCHES "(-stdlib=[^ ]+)")
21      set(_stdlib "${CMAKE_MATCH_1}")
22    endif ()
23    if (CMAKE_CXX_FLAGS MATCHES "(-std=[^ ]+)")
24      set(_stdver "${CMAKE_MATCH_1}")
25    endif ()
26  else ()
27    set(_compilerExecutable "${CMAKE_C_COMPILER}")
28    set(_arg1 "${CMAKE_C_COMPILER_ARG1}")
29  endif ()
30  separate_arguments(_arg1 NATIVE_COMMAND "${_arg1}")
31  execute_process(COMMAND ${_compilerExecutable} ${_arg1} ${_stdver} ${_stdlib} -v -E -x ${_lang} -dD dummy
32                  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles
33                  ERROR_VARIABLE _gccOutput
34                  OUTPUT_VARIABLE _gccStdout )
35  file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy")
36
37  # First find the system include dirs:
38  if( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+ *\n) *End of (search) list" )
39
40    # split the output into lines and then remove leading and trailing spaces from each of them:
41    string(REGEX MATCHALL "[^\n]+\n" _includeLines "${CMAKE_MATCH_1}")
42    foreach(nextLine ${_includeLines})
43      # on OSX, gcc says things like this:  "/System/Library/Frameworks (framework directory)", strip the last part
44      string(REGEX REPLACE "\\(framework directory\\)" "" nextLineNoFramework "${nextLine}")
45      # strip spaces at the beginning and the end
46      string(STRIP "${nextLineNoFramework}" _includePath)
47      list(APPEND ${_resultIncludeDirs} "${_includePath}")
48    endforeach()
49
50  endif()
51
52
53  # now find the builtin macros:
54  string(REGEX MATCHALL "#define[^\n]+\n" _defineLines "${_gccStdout}")
55# A few example lines which the regexp below has to match properly:
56#  #define   MAX(a,b) ((a) > (b) ? (a) : (b))
57#  #define __fastcall __attribute__((__fastcall__))
58#  #define   FOO (23)
59#  #define __UINTMAX_TYPE__ long long unsigned int
60#  #define __UINTMAX_TYPE__ long long unsigned int
61#  #define __i386__  1
62
63  foreach(nextLine ${_defineLines})
64    string(REGEX MATCH "^#define +([A-Za-z_][A-Za-z0-9_]*)(\\([^\\)]+\\))? +(.+) *$" _dummy "${nextLine}")
65    set(_name "${CMAKE_MATCH_1}${CMAKE_MATCH_2}")
66    string(STRIP "${CMAKE_MATCH_3}" _value)
67    #message(STATUS "m1: -${CMAKE_MATCH_1}- m2: -${CMAKE_MATCH_2}- m3: -${CMAKE_MATCH_3}-")
68
69    list(APPEND ${_resultDefines} "${_name}")
70    if ("${_value}" STREQUAL "")
71      list(APPEND ${_resultDefines} " ")
72    else()
73      list(APPEND ${_resultDefines} "${_value}")
74    endif()
75  endforeach()
76
77endmacro()
78
79# Save the current LC_ALL, LC_MESSAGES, and LANG environment variables and set them
80# to "C" that way GCC's "search starts here" text is in English and we can grok it.
81set(_orig_lc_all      $ENV{LC_ALL})
82set(_orig_lc_messages $ENV{LC_MESSAGES})
83set(_orig_lang        $ENV{LANG})
84
85set(ENV{LC_ALL}      C)
86set(ENV{LC_MESSAGES} C)
87set(ENV{LANG}        C)
88
89# Now check for C, works for gcc and Intel compiler at least
90if (NOT CMAKE_EXTRA_GENERATOR_C_SYSTEM_INCLUDE_DIRS)
91  if (CMAKE_C_COMPILER_ID MATCHES GNU  OR  CMAKE_C_COMPILER_ID MATCHES "Intel"  OR  CMAKE_C_COMPILER_ID MATCHES Clang)
92    _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c _dirs _defines)
93    set(CMAKE_EXTRA_GENERATOR_C_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "C compiler system include directories")
94    set(CMAKE_EXTRA_GENERATOR_C_SYSTEM_DEFINED_MACROS "${_defines}" CACHE INTERNAL "C compiler system defined macros")
95  elseif ("${CMAKE_C_COMPILER_ID}" MATCHES MSVC)
96    set(CMAKE_EXTRA_GENERATOR_C_SYSTEM_INCLUDE_DIRS "$ENV{INCLUDE}" CACHE INTERNAL "C compiler system include directories")
97  endif ()
98endif ()
99
100# And now the same for C++
101if (NOT CMAKE_EXTRA_GENERATOR_CXX_SYSTEM_INCLUDE_DIRS)
102  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU  OR  "${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel"  OR  "${CMAKE_CXX_COMPILER_ID}" MATCHES Clang)
103    _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c++ _dirs _defines)
104    set(CMAKE_EXTRA_GENERATOR_CXX_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "CXX compiler system include directories")
105    set(CMAKE_EXTRA_GENERATOR_CXX_SYSTEM_DEFINED_MACROS "${_defines}" CACHE INTERNAL "CXX compiler system defined macros")
106  elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES MSVC)
107    set(CMAKE_EXTRA_GENERATOR_CXX_SYSTEM_INCLUDE_DIRS "$ENV{INCLUDE}" CACHE INTERNAL "CXX compiler system include directories")
108  endif ()
109endif ()
110
111# Restore original LC_ALL, LC_MESSAGES, and LANG
112set(ENV{LC_ALL}      ${_orig_lc_all})
113set(ENV{LC_MESSAGES} ${_orig_lc_messages})
114set(ENV{LANG}        ${_orig_lang})
115