74 lines
3.0 KiB
CMake
74 lines
3.0 KiB
CMake
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#.rst:
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# ECMOptionalAddSubdirectory
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# --------------------------
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#
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# Make subdirectories optional.
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#
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# ::
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#
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# ecm_optional_add_subdirectory(<dir>)
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#
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# This behaves like add_subdirectory(), except that it does not complain if the
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# directory does not exist. Additionally, if the directory does exist, it
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# creates an option to allow the user to skip it. The option will be named
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# BUILD_<dir>.
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#
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# This is useful for "meta-projects" that combine several mostly-independent
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# sub-projects.
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#
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# If the CMake variable DISABLE_ALL_OPTIONAL_SUBDIRECTORIES is set to TRUE for
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# the first CMake run on the project, all optional subdirectories will be
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# disabled by default (but can of course be enabled via the respective options).
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# For example, the following will disable all optional subdirectories except the
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# one named "foo":
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#
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# .. code-block:: sh
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#
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# cmake -DDISABLE_ALL_OPTIONAL_SUBDIRECTORIES=TRUE -DBUILD_foo=TRUE myproject
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#
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# Since pre-1.0.0.
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#=============================================================================
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# Copyright 2007 Alexander Neundorf <neundorf@kde.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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function(ECM_OPTIONAL_ADD_SUBDIRECTORY _dir)
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get_filename_component(_fullPath ${_dir} ABSOLUTE)
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if(EXISTS ${_fullPath}/CMakeLists.txt)
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if(DISABLE_ALL_OPTIONAL_SUBDIRECTORIES)
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set(_DEFAULT_OPTION_VALUE FALSE)
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else()
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set(_DEFAULT_OPTION_VALUE TRUE)
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endif()
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if(DISABLE_ALL_OPTIONAL_SUBDIRS AND NOT DEFINED BUILD_${_dir})
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set(_DEFAULT_OPTION_VALUE FALSE)
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endif()
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option(BUILD_${_dir} "Build directory ${_dir}" ${_DEFAULT_OPTION_VALUE})
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if(BUILD_${_dir})
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add_subdirectory(${_dir})
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endif()
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endif()
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endfunction()
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