CMake/Examples: Difference between revisions

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Please add examples as you find common procedures which are not explained here!
Please add examples as you find common procedures which are not explained here!


=Basics=
==Basics==


==Set a CMake variable==
===Set a CMake variable===
<source lang="cmake">
<source lang="cmake">
SET(VARIABLE VALUE)
SET(VARIABLE VALUE)
</source>
</source>


==View a CMake variable==
===View a CMake variable===
<source lang="cmake">
<source lang="cmake">
MESSAGE("CMAKE_BINARY_DIR: ${CMAKE_BINARY_DIR}")
MESSAGE("CMAKE_BINARY_DIR: ${CMAKE_BINARY_DIR}")
</source>
</source>


==View a system variable==
===View a system variable===
<source lang="cmake">
<source lang="cmake">
MESSAGE("$ENV{PATH}")
MESSAGE("$ENV{PATH}")
</source>
</source>


==Check operating system==
===Check operating system===
<source lang="cmake">
<source lang="cmake">
  IF(WIN32)
  IF(WIN32)
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</source>
</source>


==Check operating system==
===Check operating system===
<source lang="cmake">
<source lang="cmake">
IF(CMAKE_SYSTEM_NAME STREQUAL Linux)
IF(CMAKE_SYSTEM_NAME STREQUAL Linux)
</source>
</source>


=Outputs=
==Outputs==
==Message==
===Message===
<source lang="cmake">
<source lang="cmake">
MESSAGE("Hello world")
MESSAGE("Hello world")
</source>
</source>


==Error==
===Error===
<source lang="cmake">
<source lang="cmake">
MESSAGE(FATAL_ERROR "An error occured.")
MESSAGE(FATAL_ERROR "An error occured.")
</source>
</source>


=Logical Operators=
==Logical Operators==
These operators work exactly as you would expect.
These operators work exactly as you would expect.


==AND==
===AND===
if(A AND B)
if(A AND B)


==OR==
===OR===
if(A OR B)
if(A OR B)


==NOT==
===NOT===
if(NOT A)
if(NOT A)


==Compound==
===Compound===
if(NOT(A AND B))
if(NOT(A AND B))


=Finding Packages=
==Finding Packages==
Most of the time large packages will have their Find[PackageName].cmake file included in the cmake distribution. If that is the case, all you must do it:
Most of the time large packages will have their Find[PackageName].cmake file included in the cmake distribution. If that is the case, all you must do it:


FIND_PACKAGE(Eigen3)
FIND_PACKAGE(Eigen3)


==Checking if a package was found==
===Checking if a package was found===
Most of the time the [PackageName]_FOUND variable is defined. You can use it like this:
Most of the time the [PackageName]_FOUND variable is defined. You can use it like this:
FIND_PACKAGE(Eigen3)
FIND_PACKAGE(Eigen3)
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endif(EIGEN3_FOUND)
endif(EIGEN3_FOUND)


==Suppress warnings==
===Suppress warnings===
Sometimes you may want to optionally include a package. You can suppress the warning about the package not being found with:
Sometimes you may want to optionally include a package. You can suppress the warning about the package not being found with:
FIND_PACKAGE(Eigen3 QUIET)
FIND_PACKAGE(Eigen3 QUIET)


=Fix Mininum Version Error/Warning=
==Fix Mininum Version Error/Warning==
<source lang="cmake">
<source lang="cmake">
cmake_minimum_required(VERSION 2.6.0 FATAL_ERROR)
cmake_minimum_required(VERSION 2.6.0 FATAL_ERROR)
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=Look in the directory that the CMakeLists.txt file is for header and implementation files=
==Look in the directory that the CMakeLists.txt file is for header and implementation files==
<source lang="cmake">
<source lang="cmake">
INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})  
INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})  
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</source>
</source>


=Set Link Directories=
==Set Link Directories==
If a library you are using does not have a [LibraryName].cmake, you can do
If a library you are using does not have a [LibraryName].cmake, you can do
<source lang="cmake">
<source lang="cmake">
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If it does not, it can be set through the CMake GUI.
If it does not, it can be set through the CMake GUI.


=Set Include Directories=
==Set Include Directories==
This command adds a path to the include directories, you do NOT have to do the 'export' style ``keep everything that is here and add this one'' syntax.
This command adds a path to the include directories, you do NOT have to do the 'export' style ``keep everything that is here and add this one'' syntax.
<source lang="cmake">
<source lang="cmake">
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</source>
</source>


=View the directories that are set=
==View the directories that are set==
<source lang="cmake">
<source lang="cmake">
get_property(inc_dirs DIRECTORY PROPERTY INCLUDE_DIRECTORIES)
get_property(inc_dirs DIRECTORY PROPERTY INCLUDE_DIRECTORIES)
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</source>
</source>


=Automate configure and generate=
==Automate configure and generate==
Note 'cmake' instead of 'ccmake' (ccmake is curses cmake (curses is the terminal gui))
Note 'cmake' instead of 'ccmake' (ccmake is curses cmake (curses is the terminal gui))
<source lang="cmake">
<source lang="cmake">
Line 123: Line 123:
</source>
</source>


=Compiler options=
==Compiler options==
==Set a cmake flag==
===Set a cmake flag===
<source lang="cmake">
<source lang="cmake">
ccmake ../../src/boost -DCMAKE_IS_EXPERIMENTAL=YES_I_KNOW
ccmake ../../src/boost -DCMAKE_IS_EXPERIMENTAL=YES_I_KNOW
</source>
</source>


==Set a cpp flag==
===Set a cpp flag===
<source lang="cmake">
<source lang="cmake">
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__WXGTK__")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__WXGTK__")
</source>
</source>


==Force g++==
===Force g++===
Ocassionally you will come across files with the extension .c that actually contain c++ code. CMake treats the file based on its extension. If you want to override this behavior (in this case, compile .c files with your c++ compiler), do the following:
Ocassionally you will come across files with the extension .c that actually contain c++ code. CMake treats the file based on its extension. If you want to override this behavior (in this case, compile .c files with your c++ compiler), do the following:


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</source>
</source>


==Per-target==
===Per-target===
<source lang="cmake">
<source lang="cmake">
set_target_properties(myexe_target
set_target_properties(myexe_target
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</source>
</source>


=Set the default build type=
==Set the default build type==
<source lang="cmake">
<source lang="cmake">
SET(CMAKE_BUILD_TYPE Debug CACHE STRING "default to debug" FORCE)
SET(CMAKE_BUILD_TYPE Debug CACHE STRING "default to debug" FORCE)
</source>
</source>


=Custom variable=
==Custom variable==


Here is a list of supported variable types: http://www.cmake.org/cmake/help/cmake2.6docs.html#command:set
Here is a list of supported variable types: http://www.cmake.org/cmake/help/cmake2.6docs.html#command:set


==String==
===String===
<source lang="cmake">
<source lang="cmake">
SET(BUILD_PARAVIEW_PLUGIN ON CACHE STRING "Build Paraview plugin?" FORCE)
SET(BUILD_PARAVIEW_PLUGIN ON CACHE STRING "Build Paraview plugin?" FORCE)
</source>
</source>
==Bool==
===Bool===
<source lang="cmake">
<source lang="cmake">
SET(DAI_WITH_BP ON CACHE BOOL "Belief Propagation" FORCE)
SET(DAI_WITH_BP ON CACHE BOOL "Belief Propagation" FORCE)
</source>
</source>


===Comparison===
====Comparison====
<source lang="cmake">
<source lang="cmake">
if(DAI_WITH_BP EQUALS ON)
if(DAI_WITH_BP EQUALS ON)
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</source>
</source>


=Linking to specific libraries=
==Linking to specific libraries==
==ITK==
===ITK===
Add the path to your environment:
Add the path to your environment:
<source lang="text">
<source lang="text">
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</source>
</source>


==VXL==
===VXL===
Add the path to your environment:
Add the path to your environment:
<source lang="text">
<source lang="text">
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</source>
</source>


==VTK==
===VTK===
Add the path to your environment:
Add the path to your environment:
<source lang="text">
<source lang="text">
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</source>
</source>


==Boost==
===Boost===


Add to the environment:
Add to the environment:
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</source>
</source>


==OpenCV==
===OpenCV===


Add to the environment:
Add to the environment:
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</source>
</source>


==Get Help Using a Library==
===Get Help Using a Library===
<source lang="cmake">
<source lang="cmake">
cmake --help-module FindBoost
cmake --help-module FindBoost
</source>
</source>


==Add new libraries to CMake==
===Add new libraries to CMake===
<source lang="cmake">
<source lang="cmake">
/usr/share/cmake/Modules/FindOpenGL.cmake|
/usr/share/cmake/Modules/FindOpenGL.cmake|
</source>
</source>


=Dependency Graph=
==Dependency Graph==
<source lang="cmake">
<source lang="cmake">
ccmake ../src/Program/ --graphviz=test.graph  
ccmake ../src/Program/ --graphviz=test.graph  
Line 273: Line 273:
</source>
</source>


=CTest=
==CTest==
==Run a specific test by number==
===Run a specific test by number===
e.g. Test 622
e.g. Test 622
<source lang="cmake">
<source lang="cmake">
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</source>
</source>


==Run a range of tests==
===Run a range of tests===
e.g. Test 622 to 625
e.g. Test 622 to 625
<source lang="cmake">
<source lang="cmake">
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</source>
</source>


==Run a test by name==
===Run a test by name===
<source lang="cmake">
<source lang="cmake">
ctest -R "itkTransformPoint*"|
ctest -R "itkTransformPoint*"|
</source>
</source>


=Link to a library=
==Link to a library==
<source lang="cmake">
<source lang="cmake">
ADD_EXECUTABLE(ColoredLines ColoredLines.cpp)
ADD_EXECUTABLE(ColoredLines ColoredLines.cpp)
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=Create a library=
==Create a library==
<source lang="cmake">
<source lang="cmake">
add_library(MatlabLibrary ./MatlabDll/LidarK.cpp)
add_library(MatlabLibrary ./MatlabDll/LidarK.cpp)
</source>
</source>

Revision as of 17:03, 2 May 2011

Welcome to the CMake Wiki Examples! These short snippets which show you how to perform many common CMake procedures. Please see [1] for the verbose documentation.

Please add examples as you find common procedures which are not explained here!

Basics

Set a CMake variable

<source lang="cmake"> SET(VARIABLE VALUE) </source>

View a CMake variable

<source lang="cmake"> MESSAGE("CMAKE_BINARY_DIR: ${CMAKE_BINARY_DIR}") </source>

View a system variable

<source lang="cmake"> MESSAGE("$ENV{PATH}") </source>

Check operating system

<source lang="cmake">

IF(WIN32)
  ...do something...
ELSE(WIN32)
  ...do something else...
ENDIF(WIN32)

</source>

Check operating system

<source lang="cmake"> IF(CMAKE_SYSTEM_NAME STREQUAL Linux) </source>

Outputs

Message

<source lang="cmake"> MESSAGE("Hello world") </source>

Error

<source lang="cmake"> MESSAGE(FATAL_ERROR "An error occured.") </source>

Logical Operators

These operators work exactly as you would expect.

AND

if(A AND B)

OR

if(A OR B)

NOT

if(NOT A)

Compound

if(NOT(A AND B))

Finding Packages

Most of the time large packages will have their Find[PackageName].cmake file included in the cmake distribution. If that is the case, all you must do it:

FIND_PACKAGE(Eigen3)

Checking if a package was found

Most of the time the [PackageName]_FOUND variable is defined. You can use it like this: FIND_PACKAGE(Eigen3) if(EIGEN3_FOUND)

... do something ...

endif(EIGEN3_FOUND)

Suppress warnings

Sometimes you may want to optionally include a package. You can suppress the warning about the package not being found with: FIND_PACKAGE(Eigen3 QUIET)

Fix Mininum Version Error/Warning

<source lang="cmake"> cmake_minimum_required(VERSION 2.6.0 FATAL_ERROR) </source>


Look in the directory that the CMakeLists.txt file is for header and implementation files

<source lang="cmake"> INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}) </source>

or

<source lang="cmake"> INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}) </source>

Set Link Directories

If a library you are using does not have a [LibraryName].cmake, you can do <source lang="cmake"> find_library(OPENSSL_LIB ssl $ENV{OPENSSL_LIB_PATH}) </source> This will check the environment for a variable named OPENSSL_LIB_PATH. If it exists, you can then use <source lang="cmake"> target_link_libraries(mytarget ${OPENSSL_LIB}) </source>

If it does not, it can be set through the CMake GUI.

Set Include Directories

This command adds a path to the include directories, you do NOT have to do the 'export' style ``keep everything that is here and add this one syntax. <source lang="cmake"> INCLUDE_DIRECTORIES(/some/directory) </source>

View the directories that are set

<source lang="cmake"> get_property(inc_dirs DIRECTORY PROPERTY INCLUDE_DIRECTORIES) message("inc_dirs = ${inc_dirs}") </source>

Automate configure and generate

Note 'cmake' instead of 'ccmake' (ccmake is curses cmake (curses is the terminal gui)) <source lang="cmake"> cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=/usr/mylocation ../ </source>

Compiler options

Set a cmake flag

<source lang="cmake"> ccmake ../../src/boost -DCMAKE_IS_EXPERIMENTAL=YES_I_KNOW </source>

Set a cpp flag

<source lang="cmake"> SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__WXGTK__") </source>

Force g++

Ocassionally you will come across files with the extension .c that actually contain c++ code. CMake treats the file based on its extension. If you want to override this behavior (in this case, compile .c files with your c++ compiler), do the following:

<source lang="cmake"> set(MySources main.c anotherFile.c) add_executable(SpinRecognize ${MySource}) set_source_files_properties(${MySources} PROPERTIES LANGUAGE CXX) </source>

Per-target

<source lang="cmake"> set_target_properties(myexe_target

                               PROPERTIES COMPILE_FLAGS "-Wall") 

</source>

Set the default build type

<source lang="cmake"> SET(CMAKE_BUILD_TYPE Debug CACHE STRING "default to debug" FORCE) </source>

Custom variable

Here is a list of supported variable types: http://www.cmake.org/cmake/help/cmake2.6docs.html#command:set

String

<source lang="cmake"> SET(BUILD_PARAVIEW_PLUGIN ON CACHE STRING "Build Paraview plugin?" FORCE) </source>

Bool

<source lang="cmake"> SET(DAI_WITH_BP ON CACHE BOOL "Belief Propagation" FORCE) </source>

Comparison

<source lang="cmake"> if(DAI_WITH_BP EQUALS ON)

#do something

endif(DAI_WITH_BP EQUALS ON) </source>

This is equivalent to

<source lang="cmake"> if(DAI_WITH_BP)

#do something

endif(DAI_WITH_BP) </source>

Linking to specific libraries

ITK

Add the path to your environment: <source lang="text"> export ITK_DIR=/home/doriad/bin/ITK </source>

Then in the CMakeLists.txt use: <source lang="cmake"> FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(CastImageFilter CastImageFilter.cxx) TARGET_LINK_LIBRARIES(CastImageFilter vtkHybrid ITKIO ITKBasicFilters ITKCommon ) </source>

VXL

Add the path to your environment: <source lang="text"> export VXLBIN="/home/doriad/bin/vxl" </source>

Then in the CMakeLists.txt use: <source lang="cmake"> FIND_PACKAGE(VXL REQUIRED) INCLUDE(${VXL_CMAKE_DIR}/UseVXL.cmake) </source>

VTK

Add the path to your environment: <source lang="text"> export VTK_DIR="/home/doriad/bin/VTK" </source>

Then in the CMakeLists.txt use: <source lang="cmake"> FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE}) </source>

Boost

Add to the environment: <source lang="text"> export BOOST_ROOT="/home/doriad/src/boost" export BOOST_LIBRARYDIR="/home/doriad/bin/boost/lib" #maybe don't have to set this one? Verify. </source>

Then in the CMakeLists.txt use: <source lang="cmake"> SET(Boost_USE_MULTITHREAD ON) #set a flag FIND_PACKAGE(Boost 1.34.1 COMPONENTS date_time filesystem) INCLUDE_DIRECTORIES(${INCLUDE_DIRECTORIES} ${Boost_INCLUDE_DIRS}) LINK_DIRECTORIES(${LINK_DIRECTORIES} ${Boost_LIBRARY_DIRS}) </source>

OpenCV

Add to the environment: <source lang="text"> export OpenCV_DIR=/home/doriad/bin/OpenCV </source>

Then in the CMakeLists.txt use: <source lang="cmake"> FIND_PACKAGE(OpenCV REQUIRED ) INCLUDE_DIRECTORIES( ${OPENCV_INCLUDE_DIR} )

ADD_EXECUTABLE(Scalar Scalar.cxx) TARGET_LINK_LIBRARIES(Scalar ${OpenCV_LIBS}) </source>

Get Help Using a Library

<source lang="cmake"> cmake --help-module FindBoost </source>

Add new libraries to CMake

<source lang="cmake"> /usr/share/cmake/Modules/FindOpenGL.cmake| </source>

Dependency Graph

<source lang="cmake"> ccmake ../src/Program/ --graphviz=test.graph dotty test.graph </source>

CTest

Run a specific test by number

e.g. Test 622 <source lang="cmake"> ctest -I 622,622 </source>

Run a range of tests

e.g. Test 622 to 625 <source lang="cmake"> ctest -I 622,625 </source>

Run a test by name

<source lang="cmake"> ctest -R "itkTransformPoint*"| </source>

Link to a library

<source lang="cmake"> ADD_EXECUTABLE(ColoredLines ColoredLines.cpp) TARGET_LINK_LIBRARIES(ColoredLines vtkHybrid) </source>


Create a library

<source lang="cmake"> add_library(MatlabLibrary ./MatlabDll/LidarK.cpp) </source>