CMake Variables 【转载|linux】

 

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CMake Useful Variables

CMake uses and defines many variables, which can be used in CMakeLists.txt files.

NOTE: As of CMake 2.6.0 many of these variables have been officially documented in TXT and HTML files released with CMake. You may still see some useful variables here that haven't yet been documented in the official documentation, although the number of these diminishes with every release. This page, in either case, is more of a distilled list of some of the more important variables. The official documentation is home of the authoritative guide to all CMake variables, commands, and properties.

Contents

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Locations

CMAKE_BINARY_DIR  if you are building in-source, this is the same as CMAKE_SOURCE_DIR, otherwise this is the top level directory of your build tree CMAKE_COMMAND  this is the complete path of the cmake which runs currently (e.g. /usr/local/bin/cmake) CMAKE_CURRENT_BINARY_DIR  if you are building in-source, this is the same as CMAKE_CURRENT_SOURCE_DIR, otherwise this is the directory where the compiled or generated files from the current CMakeLists.txt will go to CMAKE_CURRENT_LIST_FILE  this is the full path to the listfile currently being processed. CMAKE_CURRENT_LIST_DIR  (since 2.8.3) this is the directory of the listfile currently being processed. CMAKE_CURRENT_LIST_LINE  this is linenumber where the variable is used.

CMakeLists.txt contains the PROJECT() command CMAKE_CURRENT_SOURCE_DIR  this is the directory where the currently processed CMakeLists.txt is located in CMAKE_FILES_DIRECTORY  the directory within the current binary directory that contains all the CMake generated files. Typically evaluates to "/CMakeFiles". Note the leading slash for the directory. Typically used with the current binary directory, i.e. ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY} CMAKE_MODULE_PATH  tell CMake to search first in directories listed in CMAKE_MODULE_PATH when you use FIND_PACKAGE() or INCLUDE()
SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/MyCMakeScripts)
FIND_PACKAGE(HelloWorld) CMAKE_ROOT  this is the CMake installation directory CMAKE_SOURCE_DIR  this is the directory, from which cmake was started, i.e. the top level source directory EXECUTABLE_OUTPUT_PATH  set this variable to specify a common place where CMake should put all executable files (instead of CMAKE_CURRENT_BINARY_DIR)
SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin) LIBRARY_OUTPUT_PATH  set this variable to specify a common place where CMake should put all libraries (instead of CMAKE_CURRENT_BINARY_DIR)
SET(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib) PROJECT_NAME  the name of the project set by PROJECT() command. CMAKE_PROJECT_NAME  the name of the first project set by the PROJECT() command, i.e. the top level project. PROJECT_BINARY_DIR  contains the full path to the top level directory of your build tree PROJECT_SOURCE_DIR  contains the full path to the root of your project source directory, i.e. to the nearest directory where CMakeLists.txt contains the PROJECT() command

Environment Variables

These are environment variables which effect cmake behaviour. CMAKE_INCLUDE_PATH  This is used when searching for include files e.g. using the FIND_PATH() command. If you have headers in non-standard locations, it may be useful to set this variable to this directory (e.g. /sw/include on Mac OS X). If you need several directories, separate them by the platform specific separators (e.g. ":" on UNIX) CMAKE_LIBRARY_PATH  This is used when searching for libraries e.g. using the FIND_LIBRARY() command. If you have libraries in non-standard locations, it may be useful to set this variable to this directory (e.g. /sw/lib on Mac OS X). If you need several directories, separate them by the platform specific separators (e.g. ":" on UNIX) CMAKE_PREFIX_PATH  (since CMake 2.6.0) This is used when searching for include files, binaries, or libraries using either the FIND_PACKAGE(), FIND_PATH(), FIND_PROGRAM(), or FIND_LIBRARY() commands. For each path in the CMAKE_PREFIX_PATH list, CMake will check "PATH/include" and "PATH" when FIND_PATH() is called, "PATH/bin" and "PATH" when FIND_PROGRAM() is called, and "PATH/lib" and "PATH" when FIND_LIBRARY() is called. See the documentation for FIND_PACKAGE(), FIND_LIBRARY(), FIND_PATH(), and FIND_PROGRAM() for more details. CMAKE_INSTALL_ALWAYS  If set during installation CMake will install all files whether they have changed or not. The default when this is not set is to install only files that have changed since the previous installation. In both cases all files are reported to indicate CMake knows they are up to date in the installed location. $ENV{name}  This is not an environment variable , but this is how you can access environment variables from cmake files. It returns the content of the environment variable with the given name (e.g. $ENV{PROGRAMFILES}) DESTDIR  If this environment variable is set it will be prefixed to CMAKE_INSTALL_PREFIX in places where it is used to access files during installation. This allows the files to be installed in an intermediate directory tree without changing the final installation path name. Since the value of CMAKE_INSTALL_PREFIX may be included in installed files it is important to use DESTDIR rather than changing CMAKE_INSTALL_PREFIX when it is necessary to install to a intermediate staging directory.

System & Compiler Information

CMAKE_MAJOR_VERSION  major version number for CMake, e.g. the "2" in CMake 2.4.3 CMAKE_MINOR_VERSION  minor version number for CMake, e.g. the "4" in CMake 2.4.3 CMAKE_PATCH_VERSION  patch version number for CMake, e.g. the "3" in CMake 2.4.3 CMAKE_TWEAK_VERSION  tweak version number for CMake, e.g. the "1" in CMake X.X.X.1. Releases use tweak < 20000000 and development versions use the date format CCYYMMDD for the tweak level. CMAKE_VERSION  The version number combined, eg. 2.8.4.20110222-ged5ba for a Nightly build. or 2.8.4 for a Release build. CMAKE_SYSTEM  the complete system name, e.g. "Linux-2.4.22", "FreeBSD-5.4-RELEASE" or "Windows 5.1" CMAKE_SYSTEM_NAME  the short system name, e.g. "Linux", "FreeBSD" or "Windows" CMAKE_SYSTEM_VERSION  only the version part of CMAKE_SYSTEM CMAKE_SYSTEM_PROCESSOR  the processor name (e.g. "Intel(R) Pentium(R) M processor 2.00GHz") CMAKE_GENERATOR  the generator specified on the commandline. UNIX  is TRUE on all UNIX-like OS's, including Apple OS X and CygWin WIN32  is TRUE on Windows, including CygWin APPLE  is TRUE on Apple systems. Note this does not imply the system is Mac OS X, only that __APPLE__ is #defined in C/C++ header files. Obtain more specific system information via CMAKE_SYSTEM_VERSION, i.e. IF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin"), then it's Mac OS X. MINGW  is TRUE when using the MinGW compiler in Windows MSYS  is TRUE when using the MSYS developer environment in Windows CYGWIN  is TRUE on Windows when using the CygWin version of cmake BORLAND  is TRUE on Windows when using a Borland compiler WATCOM  is TRUE on Windows when using the Open Watcom compiler MSVC, MSVC_IDE, MSVC60, MSVC70, MSVC71, MSVC80, CMAKE_COMPILER_2005, MSVC90, MSVC10 (Visual Studio 2010)  Microsoft compiler CMAKE_COMPILER_IS_GNUCC  is TRUE if the compiler is a variant of gcc CMAKE_COMPILER_IS_GNUCXX  is TRUE if the compiler is a variant of g++

Various Options

CMAKE_SKIP_RULE_DEPENDENCY  set this to true if you don't want to rebuild the object files if the rules have changed, but not the actual source files or headers (e.g. if you changed the some compiler switches) CMAKE_SKIP_INSTALL_ALL_DEPENDENCY  since CMake 2.1 the install rule depends on all, i.e. everything will be built before installing. If you don't like this, set this one to true. CMAKE_SKIP_RPATH  If set, runtime paths are not added when using shared libraries. Default it is set to OFF. CMAKE_INCLUDE_CURRENT_DIR  automatically add CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR to the include directories in every processed CMakeLists.txt. It behaves as if you had used INCLUDE_DIRECTORIES in every CMakeLists.txt file or your project. The added directory paths are relative to the being-processed CMakeLists.txt, which is different in each directory. (See for more details). CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE  order the include directories so that directories which are in the source or build tree always come before directories outside the project. CMAKE_VERBOSE_MAKEFILE  set this to true if you are using makefiles and want to see the full compile and link commands instead of only the shortened ones CMAKE_SUPPRESS_REGENERATION  this will cause CMake to not put in the rules that re-run CMake. This might be useful if you want to use the generated build files on another machine. CMAKE_COLOR_MAKEFILE  create Makefiles with colored output (defaults to on) CMAKE_SKIP_PREPROCESSED_SOURCE_RULES  (since 2.4.4) if set to TRUE, the generated Makefiles will not contain rules for creating preprocessed files (foo.i) CMAKE_SKIP_ASSEMBLY_SOURCE_RULES  (since 2.4.4) if set to TRUE, the generated Makefiles will not contain rules for creating compiled, but not yet assembled files (foo.s) CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS  (redundant since 2.6.0) set this to true if you don't want to have to bother having your IF() ELSE() and ENDIF() conditions match. In other words so you can do this:

IF(FOO)
   SET(BAR bar.cc)
ELSE()
   SET(BAR bar2.cc)
ENDIF()

Compilers and Tools

BUILD_SHARED_LIBS  if this is set to ON, then all libraries are built as shared libraries by default.
SET(BUILD_SHARED_LIBS ON) CMAKE_AR  tool for creating libraries. See also CMAKE_RANLIB, as "ar" and "ranlib" are typically used together. CMAKE_BUILD_TYPE  A variable which controls the type of build when using a single-configuration generator like the Makefile generator. CMake will create by default the following variables when using a single-configuration generator:

• None (CMAKE_C_FLAGS or CMAKE_CXX_FLAGS used)
• Debug (CMAKE_C_FLAGS_DEBUG or CMAKE_CXX_FLAGS_DEBUG)
• Release (CMAKE_C_FLAGS_RELEASE or CMAKE_CXX_FLAGS_RELEASE)
• RelWithDebInfo (CMAKE_C_FLAGS_RELWITHDEBINFO or CMAKE_CXX_FLAGS_RELWITHDEBINFO
• MinSizeRel (CMAKE_C_FLAGS_MINSIZEREL or CMAKE_CXX_FLAGS_MINSIZEREL)

You can use these default compilation flags (or modify them) by setting the CMAKE_BUILD_TYPE variable at configuration time from within the "ccmake" GUI. Note! The default values for these flags change with different compilers. If CMake does not know your compiler, the contents will be empty.

If you are using the Makefile generator, you can create your own build type like this:
SET(CMAKE_BUILD_TYPE distribution)
SET(CMAKE_CXX_FLAGS_DISTRIBUTION "-O3")
SET(CMAKE_C_FLAGS_DISTRIBUTION "-O3")

Note that CMAKE_BUILD_TYPE is not initialized with a readable value at configuration time. This is because the user is free to select a build type at build time. Use CMAKE_CFG_INTDIR if you need a variable that evaluates to the correct build time directory. CMAKE_CONFIGURATION_TYPES  When using a multi-configuration generator, such as the one for Visual Studio, this variable contains a list of the available configurations. CMAKE_C_COMPILER  the compiler used for C files. Normally it is detected and set during the CMake run, but you can override it at configuration time. Note! It can not be changed after the first cmake or ccmake run. Although the gui allows to enter an alternative, it will be ignored in the next 'configure' run. Use for example:
CC=gcc-3.3 CXX=g++-3.3 cmake
to set the compiler. (You can also set CMAKE_C_COMPILER_INIT, before any PROJECT() or ENABLE_LANGUAGE() command.) Any other way (like writing make CC=gcc-3.3 CXX=g++-3.3) will not work. When using distcc or similar tools, you need to write:
CC="distcc gcc-3.3" CXX="distcc g++-3.3" cmake
However, this will empty all your CMAKE_..._FLAGS_... above. CMAKE_C_FLAGS  the compiler flags for compiling C sources. Note you can also specify switches with ADD_DEFINITIONS(). CMAKE_C_FLAGS_DEBUG  compiler flags for compiling a debug build from C sources. CMAKE_C_FLAGS_RELEASE  compiler flags for compiling a release build from C sources. CMAKE_C_FLAGS_RELWITHDEBINFO  compiler flags for compiling a release build with debug flags from C sources. CMAKE_C_OUTPUT_EXTENSION  what C object files end in. Typically .o or .obj. CMAKE_CFG_INTDIR  meta-variable! Please note that this is an important variable, since on multi-configuration generators it will be generated into dynamically switched content based on the configuration that the user currently selected within the generated build environment. Indicates the name of the current configuration (~ directory) for the project. May be used for any purpose which needs per-configuration-dynamic switching of strings, not just OutputDir configuration. For multi-configuration generators (e.g. MSVC) the resulting strings are typically some of "Debug", "Release", "RelWithDebInfo", or "MinSizeRel". For other compiler generators (single-configuration ones) it is typically ".", as they don't use MSVC-style configuration directories. CMAKE_CXX_COMPILER  the compiler used for C++ files. Normally it is detected and set during the CMake run, but you can override it at configuration time. Note! It can not be changed after the first cmake or ccmake run. See CMAKE_C_COMPILER above. CMAKE_CXX_FLAGS  the compiler flags for compiling C++ sources. Note you can also specify switches with ADD_DEFINITIONS(). CMAKE_CXX_FLAGS_DEBUG  compiler flags for compiling a debug build from C++ sources. CMAKE_CXX_FLAGS_RELEASE  compiler flags for compiling a release build from C++ sources. CMAKE_CXX_FLAGS_RELWITHDEBINFO  compiler flags for compiling a release build with debug flags from C++ sources. CMAKE_RANLIB  tool for creating libraries. See also CMAKE_AR, as "ar" and "ranlib" are typically used together. CMAKE_SHARED_LINKER_FLAGS  additional compiler flags for building shared libraries, e.g.:

set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined")
On Unix systems, this will make linker report any unresolved symbols from object files (which is quite typical when you compile many targets in CMake projects, but do not bother with linking target dependencies in proper order).

Prefixes, Suffixes (Postfixes), and Extensions

CMAKE_C_IGNORE_EXTENSIONS  CMAKE_C_OUTPUT_EXTENSION  what C object files end in. Typically .o or .obj. CMAKE_C_SOURCE_FILE_EXTENSIONS  CMAKE_CXX_IGNORE_EXTENSIONS  CMAKE_CXX_OUTPUT_EXTENSION  what C++ object files end in. Typically .o or .obj. CMAKE_CXX_SOURCE_FILE_EXTENSIONS  CMAKE_EXECUTABLE_SUFFIX  CMAKE_FIND_LIBRARY_PREFIXES  CMAKE_FIND_LIBRARY_SUFFIXES  CMAKE_IMPORT_LIBRARY_PREFIX  Windows-specific. Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_IMPORT_LIBRARY_SUFFIX  Windows-specific. Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_LINK_LIBRARY_SUFFIX  Windows-specific. CMAKE_RC_OUTPUT_EXTENSION  Windows-specific. CMAKE_RC_SOURCE_FILE_EXTENSIONS  Windows-specific. CMAKE_SHARED_LIBRARY_PREFIX  Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_SHARED_LIBRARY_SUFFIX  Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_SHARED_MODULE_PREFIX  CMAKE_SHARED_MODULE_SUFFIX  CMAKE_STATIC_LIBRARY_PREFIX  Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_STATIC_LIBRARY_SUFFIX  Appears to be read-only. Use SET_TARGET_PROPERTIES. CMAKE_DEBUG_POSTFIX  Add a custom "postfix" to static and shared libraries when in Debug build. Example: mylib_d.lib. CMAKE_RELEASE_POSTFIX  CMAKE__POSTFIX 

Build rules

Build rules are defined in CMakeCInformation.cmake and CMakeCXXInformation.cmake.

Rules for C++ sources: CMAKE_CXX_CREATE_SHARED_LIBRARY CMAKE_CXX_CREATE_SHARED_MODULE CMAKE_CXX_CREATE_STATIC_LIBRARY CMAKE_CXX_COMPILE_OBJECT CMAKE_CXX_LINK_EXECUTABLE

and the equivalents for C sources: CMAKE_C_CREATE_SHARED_LIBRARY CMAKE_C_CREATE_SHARED_MODULE CMAKE_C_CREATE_STATIC_LIBRARY CMAKE_C_COMPILE_OBJECT CMAKE_C_LINK_EXECUTABLE

You can override the variables manually, e.g. replacing some flags in the linker command, but you can't change the value of the variables in sharp braces. Usually you don't have to change these rules, only in rare cases. You should only do this if you know what you are doing and there is no other way.

Expansion Rules

From examining the source code the following style names exist: ASSEMBLY_SOURCE FLAGS LANGUAGE_COMPILE_FLAGS LINK_FLAGS LINK_LIBRARIES OBJECT OBJECTS OBJECTS_QUOTED OBJECT_DIR PREPROCESSED_SOURCE SOURCE TARGET TARGET_BASE TARGET_IMPLIB TARGET_INSTALLNAME_DIR TARGET_PDB TARGET_QUOTED TARGET_SONAME TARGET_VERSION_MAJOR TARGET_VERSION_MINOR