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move download and extract code into function

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This commit is contained in:
Axel Kohlmeyer
2021-10-21 17:30:54 -04:00
parent d8db9dd3ac
commit 6e3fcce9e1
3 changed files with 40 additions and 57 deletions
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42
cmake/Modules/Packages/MSCG.cmake
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@ -12,47 +12,11 @@ if(DOWNLOAD_MSCG)
mark_as_advanced(MSCG_URL)
mark_as_advanced(MSCG_MD5)
# always compile a static lib but with position independent code
# make a copy of current settings for later use
set(OLD_SHARED_LIBS ${BUILD_SHARED_LIBS})
set(OLD_POSITION_INDEPENDENT_CODE ${CMAKE_POSITION_INDEPENDENT_CODE})
set(BUILD_SHARED_LIBS OFF)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
if(CMAKE_VERSION VERSION_LESS 3.14)
file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/_deps)
file(DOWNLOAD ${MSCG_URL} ${CMAKE_BINARY_DIR}/_deps/mscg.tar.gz EXPECTED_HASH MD5=${MSCG_MD5})
execute_process(COMMAND ${CMAKE_COMMAND} -E tar xzf ${CMAKE_BINARY_DIR}/_deps/mscg.tar.gz
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/_deps)
file(GLOB MSCG_SOURCE "${CMAKE_BINARY_DIR}/_deps/MSCG-release-*")
# sanity check. do not allow to have multiple downloaded and extracted versions of the source
list(LENGTH MSCG_SOURCE _num)
if(_num GREATER 1)
message(FATAL_ERROR "Inconsistent MSCG library sources. Please delete ${CMAKE_BINARY_DIR}/_deps and re-run cmake")
endif()
add_subdirectory(${MSCG_SOURCE}/src/CMake ${CMAKE_BINARY_DIR}/_deps/mscg-build)
else()
include(FetchContent)
FetchContent_Declare(mscg URL ${MSCG_URL} URL_HASH MD5=${MSCG_MD5} SOURCE_SUBDIR src/CMake)
FetchContent_MakeAvailable(mscg)
set(MSCG_SOURCE ${CMAKE_BINARY_DIR}/_deps/mscg-src)
endif()
# restore previous settings
if(OLD_POSITION_INDEPENDENT_CODE)
set(CMAKE_POSITON_INDEPENDENT_CODE ${OLD_POSITION_INDEPENDENT_CODE})
else()
unset(CMAKE_POSITION_INDEPENDENT_CODE)
endif()
if (OLD_SHARED_LIBS)
set(BUILD_SHARED_LIBS ${OLD_SHARED_LIBS})
else()
unset(BUILD_SHARED_LIBS)
endif()
include(ExternalCMakeProject)
ExternalCMakeProject(mscg ${MSCG_URL} ${MSCG_MD5} MSCG-release src/CMake)
# set include and link library
target_include_directories(lammps PRIVATE "${MSCG_SOURCE}/src")
target_include_directories(lammps PRIVATE "${CMAKE_BINARY_DIR}/_deps/mscg-src/src")
target_link_libraries(lammps PRIVATE mscg)
else()
find_package(MSCG)