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#.rst:
# ECMOptionalAddSubdirectory
# --------------------------
#
# Make subdirectories optional.
#
# ::
#
# ecm_optional_add_subdirectory(<dir>)
#
# This behaves like add_subdirectory(), except that it does not complain if the
# directory does not exist. Additionally, if the directory does exist, it
# creates an option to allow the user to skip it. The option will be named
# BUILD_<dir>.
#
# This is useful for "meta-projects" that combine several mostly-independent
# sub-projects.
#
# 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).
# For example, the following will disable all optional subdirectories except the
# one named "foo":
#
# .. code-block:: sh
#
# cmake -DDISABLE_ALL_OPTIONAL_SUBDIRECTORIES=TRUE -DBUILD_foo=TRUE myproject
#
# Since pre-1.0.0.
#=============================================================================
# SPDX-FileCopyrightText: 2007 Alexander Neundorf <neundorf@kde.org>
#
# SPDX-License-Identifier: BSD-3-Clause
function(ECM_OPTIONAL_ADD_SUBDIRECTORY _dir)
get_filename_component(_fullPath ${_dir} ABSOLUTE)
if(EXISTS ${_fullPath}/CMakeLists.txt)
if(DISABLE_ALL_OPTIONAL_SUBDIRECTORIES)
set(_DEFAULT_OPTION_VALUE FALSE)
else()
set(_DEFAULT_OPTION_VALUE TRUE)
endif()
if(DISABLE_ALL_OPTIONAL_SUBDIRS AND NOT DEFINED BUILD_${_dir})
set(_DEFAULT_OPTION_VALUE FALSE)
endif()
option(BUILD_${_dir} "Build directory ${_dir}" ${_DEFAULT_OPTION_VALUE})
if(BUILD_${_dir})
add_subdirectory(${_dir})
endif()
endif()
endfunction()
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