2 #=============================================================================
3 # Copyright 2004-2011 Kitware, Inc.
5 # Distributed under the OSI-approved BSD License (the "License");
6 # see accompanying file Copyright.txt for details.
8 # This software is distributed WITHOUT ANY WARRANTY; without even the
9 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10 # See the License for more information.
11 #=============================================================================
12 # (To distribute this file outside of CMake, substitute the full
13 # License text for the above reference.)
15 # This file sets the basic flags for the C language in CMake.
16 # It also loads the available platform file for the system-compiler
18 # It also loads a system - compiler - processor (or target hardware)
19 # specific file, which is mainly useful for crosscompiling and embedded systems.
21 # some compilers use different extensions (e.g. sdcc uses .rel)
22 # so set the extension here first so it can be overridden by the compiler specific file
24 set(CMAKE_C_OUTPUT_EXTENSION .o)
26 set(CMAKE_C_OUTPUT_EXTENSION .obj)
31 # Load compiler-specific information.
32 if(CMAKE_C_COMPILER_ID)
33 include(Compiler/${CMAKE_C_COMPILER_ID}-C OPTIONAL)
37 get_filename_component(CMAKE_BASE_NAME ${CMAKE_C_COMPILER} NAME_WE)
38 if(CMAKE_COMPILER_IS_GNUCC)
39 set(CMAKE_BASE_NAME gcc)
43 # load a hardware specific file, mostly useful for embedded compilers
44 if(CMAKE_SYSTEM_PROCESSOR)
45 if(CMAKE_C_COMPILER_ID)
46 include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-C-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
48 if (NOT _INCLUDED_FILE)
49 include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
54 # load the system- and compiler specific files
55 if(CMAKE_C_COMPILER_ID)
56 include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-C
57 OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
59 if (NOT _INCLUDED_FILE)
60 include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}
61 OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
63 # We specify the compiler information in the system file for some
64 # platforms, but this language may not have been enabled when the file
65 # was first included. Include it again to get the language info.
66 # Remove this when all compiler info is removed from system files.
67 if (NOT _INCLUDED_FILE)
68 include(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
71 if(CMAKE_C_SIZEOF_DATA_PTR)
72 foreach(f ${CMAKE_C_ABI_FILES})
75 unset(CMAKE_C_ABI_FILES)
78 # This should be included before the _INIT variables are
79 # used to initialize the cache. Since the rule variables
80 # have if blocks on them, users can still define them here.
81 # But, it should still be after the platform file so changes can
82 # be made to those values.
84 if(CMAKE_USER_MAKE_RULES_OVERRIDE)
85 # Save the full path of the file so try_compile can use it.
86 include(${CMAKE_USER_MAKE_RULES_OVERRIDE} RESULT_VARIABLE _override)
87 set(CMAKE_USER_MAKE_RULES_OVERRIDE "${_override}")
90 if(CMAKE_USER_MAKE_RULES_OVERRIDE_C)
91 # Save the full path of the file so try_compile can use it.
92 include(${CMAKE_USER_MAKE_RULES_OVERRIDE_C} RESULT_VARIABLE _override)
93 set(CMAKE_USER_MAKE_RULES_OVERRIDE_C "${_override}")
97 # for most systems a module is the same as a shared library
98 # so unless the variable CMAKE_MODULE_EXISTS is set just
99 # copy the values from the LIBRARY variables
100 if(NOT CMAKE_MODULE_EXISTS)
101 set(CMAKE_SHARED_MODULE_C_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
102 set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
105 set(CMAKE_C_FLAGS_INIT "$ENV{CFLAGS} ${CMAKE_C_FLAGS_INIT}")
106 # avoid just having a space as the initial value for the cache
107 if(CMAKE_C_FLAGS_INIT STREQUAL " ")
108 set(CMAKE_C_FLAGS_INIT)
110 set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS_INIT}" CACHE STRING
111 "Flags used by the compiler during all build types.")
113 if(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
114 # default build type is none
115 if(NOT CMAKE_NO_BUILD_TYPE)
116 set (CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE_INIT} CACHE STRING
117 "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.")
119 set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG_INIT}" CACHE STRING
120 "Flags used by the compiler during debug builds.")
121 set (CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL_INIT}" CACHE STRING
122 "Flags used by the compiler during release minsize builds.")
123 set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE_INIT}" CACHE STRING
124 "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
125 set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
126 "Flags used by the compiler during Release with Debug Info builds.")
129 if(CMAKE_C_STANDARD_LIBRARIES_INIT)
130 set(CMAKE_C_STANDARD_LIBRARIES "${CMAKE_C_STANDARD_LIBRARIES_INIT}"
131 CACHE STRING "Libraries linked by defalut with all C applications.")
132 mark_as_advanced(CMAKE_C_STANDARD_LIBRARIES)
135 include(CMakeCommonLanguageInclude)
137 # now define the following rule variables
139 # CMAKE_C_CREATE_SHARED_LIBRARY
140 # CMAKE_C_CREATE_SHARED_MODULE
141 # CMAKE_C_COMPILE_OBJECT
142 # CMAKE_C_LINK_EXECUTABLE
144 # variables supplied by the generator at use time
146 # <TARGET_BASE> the target without the suffix
153 # C compiler information
155 # <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS>
156 # <CMAKE_SHARED_MODULE_CREATE_C_FLAGS>
157 # <CMAKE_C_LINK_FLAGS>
159 # Static library tools
164 # create a C shared library
165 if(NOT CMAKE_C_CREATE_SHARED_LIBRARY)
166 set(CMAKE_C_CREATE_SHARED_LIBRARY
167 "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
170 # create a C shared module just copy the shared library rule
171 if(NOT CMAKE_C_CREATE_SHARED_MODULE)
172 set(CMAKE_C_CREATE_SHARED_MODULE ${CMAKE_C_CREATE_SHARED_LIBRARY})
175 # Create a static archive incrementally for large object file counts.
176 # If CMAKE_C_CREATE_STATIC_LIBRARY is set it will override these.
177 if(NOT DEFINED CMAKE_C_ARCHIVE_CREATE)
178 set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> cr <TARGET> <LINK_FLAGS> <OBJECTS>")
180 if(NOT DEFINED CMAKE_C_ARCHIVE_APPEND)
181 set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> r <TARGET> <LINK_FLAGS> <OBJECTS>")
183 if(NOT DEFINED CMAKE_C_ARCHIVE_FINISH)
184 set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> <TARGET>")
187 # compile a C file into an object file
188 if(NOT CMAKE_C_COMPILE_OBJECT)
189 set(CMAKE_C_COMPILE_OBJECT
190 "<CMAKE_C_COMPILER> <DEFINES> <FLAGS> -o <OBJECT> -c <SOURCE>")
193 if(NOT CMAKE_C_LINK_EXECUTABLE)
194 set(CMAKE_C_LINK_EXECUTABLE
195 "<CMAKE_C_COMPILER> <FLAGS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
198 if(NOT CMAKE_EXECUTABLE_RUNTIME_C_FLAG)
199 set(CMAKE_EXECUTABLE_RUNTIME_C_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG})
202 if(NOT CMAKE_EXECUTABLE_RUNTIME_C_FLAG_SEP)
203 set(CMAKE_EXECUTABLE_RUNTIME_C_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP})
206 if(NOT CMAKE_EXECUTABLE_RPATH_LINK_C_FLAG)
207 set(CMAKE_EXECUTABLE_RPATH_LINK_C_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG})
213 CMAKE_C_FLAGS_MINSIZEREL
214 CMAKE_C_FLAGS_RELEASE
215 CMAKE_C_FLAGS_RELWITHDEBINFO
217 set(CMAKE_C_INFORMATION_LOADED 1)