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# - MACRO_OPTIONAL_ADD_SUBDIRECTORY() combines ADD_SUBDIRECTORY() with an OPTION()
# MACRO_OPTIONAL_ADD_SUBDIRECTORY( <dir> )
# If you use MACRO_OPTIONAL_ADD_SUBDIRECTORY() instead of ADD_SUBDIRECTORY(),
# this will have two effects
# 1 - CMake will not complain if the directory doesn't exist
# This makes sense if you want to distribute just one of the subdirs
# in a source package, e.g. just one of the subdirs in kdeextragear.
# 2 - If the directory exists, it will offer an option to skip the
# subdirectory.
# This is useful if you want to compile only a subset of all
# directories.
#
# If the CMake variable DISABLE_ALL_OPTIONAL_SUBDIRECTORIES is set to TRUE
# for the first CMake run on the project, all optional subdirectories will be disabled
# by default (but can of course be enabled via the respective options).
# E.g. the following will disable all optional subdirectories except the one named "kcalc":
# $ cmake -DDISABLE_ALL_OPTIONAL_SUBDIRECTORIES=TRUE -DBUILD_kcalc=TRUE <srcdir>
# Copyright (c) 2007, Alexander Neundorf, <neundorf@kde.org>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
MACRO (MACRO_OPTIONAL_ADD_SUBDIRECTORY _dir )
GET_FILENAME_COMPONENT(_fullPath ${_dir} ABSOLUTE)
IF(EXISTS ${_fullPath}/CMakeLists.txt)
IF(DISABLE_ALL_OPTIONAL_SUBDIRECTORIES)
SET(_DEFAULT_OPTION_VALUE FALSE)
ELSE(DISABLE_ALL_OPTIONAL_SUBDIRECTORIES)
SET(_DEFAULT_OPTION_VALUE TRUE)
ENDIF(DISABLE_ALL_OPTIONAL_SUBDIRECTORIES)
IF(DISABLE_ALL_OPTIONAL_SUBDIRS AND NOT DEFINED BUILD_${_dir})
SET(_DEFAULT_OPTION_VALUE FALSE)
ENDIF(DISABLE_ALL_OPTIONAL_SUBDIRS AND NOT DEFINED BUILD_${_dir})
OPTION(BUILD_${_dir} "Build directory ${_dir}" ${_DEFAULT_OPTION_VALUE})
IF(BUILD_${_dir})
ADD_SUBDIRECTORY(${_dir})
ENDIF(BUILD_${_dir})
ENDIF(EXISTS ${_fullPath}/CMakeLists.txt)
ENDMACRO (MACRO_OPTIONAL_ADD_SUBDIRECTORY)
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