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find_package(Git QUIET)
if(${GIT_FOUND} AND EXISTS ${CMAKE_SOURCE_DIR}/.git)
execute_process(
COMMAND ${GIT_EXECUTABLE} --git-dir=.git describe --all
RESULT_VARIABLE NOT_A_GIT_REPO
OUTPUT_QUIET ERROR_QUIET
WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
else()
set(NOT_A_GIT_REPO "NotAGitRepo")
endif()
function(nrn_submodule_file_not_found name_for_message)
if(NOT_A_GIT_REPO)
message(
FATAL_ERROR
"To build NEURON from source you either need to clone the NEURON Git repository or "
"download a source code archive that includes Git submodules, such as the "
"full-src-package-X.Y.Z.tar.gz file in a NEURON release on GitHub (${name_for_message} "
"could not be found).")
endif()
endfunction(nrn_submodule_file_not_found)
# initialize submodule with given path
function(nrn_initialize_submodule path)
if(NOT ${GIT_FOUND})
message(
FATAL_ERROR "git not found and ${path} sub-module not cloned (use git clone --recursive)")
endif()
message(STATUS "Sub-module : missing ${path} : running git submodule update --init")
execute_process(
COMMAND ${GIT_EXECUTABLE} submodule update --init -- ${path}
WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
RESULT_VARIABLE ret)
if(NOT ret EQUAL 0)
message(FATAL_ERROR "git submodule init failed")
endif()
endfunction()
# check for external project and initialize submodule if it is missing
function(nrn_add_external_project name)
find_path(
${name}_PATH
NAMES CMakeLists.txt
PATHS "${THIRD_PARTY_DIRECTORY}/${name}"
NO_DEFAULT_PATH)
if(NOT EXISTS ${${name}_PATH})
nrn_submodule_file_not_found("${THIRD_PARTY_DIRECTORY}/${name}")
nrn_initialize_submodule("${THIRD_PARTY_DIRECTORY}/${name}")
else()
message(STATUS "Sub-project : using ${name} from from ${THIRD_PARTY_DIRECTORY}/${name}")
endif()
# if second argument is passed and if it's OFF then skip add_subdirectory
if(${ARGC} GREATER 1)
if(${ARGV2})
add_subdirectory("${THIRD_PARTY_DIRECTORY}/${name}")
endif()
else()
add_subdirectory("${THIRD_PARTY_DIRECTORY}/${name}")
endif()
endfunction()
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