37dfc9e141
as it turns out, fetchcontent is calling external_project internally at some point which to avoid is why this function was started in the first place
34 lines
1.7 KiB
CMake
34 lines
1.7 KiB
CMake
# Build a CMake based external library as subdirectory.
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# The sources will be unpacked to ${CMAKE_BINARY_DIR}/_deps/${target}-src
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# The binaries will be built in ${CMAKE_BINARY_DIR}/_deps/${target}-build
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#
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function(ExternalCMakeProject target url hash basedir cmakedir cmakefile)
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# change settings locally
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set(BUILD_SHARED_LIBS OFF)
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set(CMAKE_POSITION_INDEPENDENT_CODE ON)
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get_filename_component(archive ${url} NAME)
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file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src)
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message(STATUS "Downloading ${url}")
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file(DOWNLOAD ${url} ${CMAKE_BINARY_DIR}/_deps/${archive} EXPECTED_HASH MD5=${hash} SHOW_PROGRESS)
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message(STATUS "Unpacking and configuring ${archive}")
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execute_process(COMMAND ${CMAKE_COMMAND} -E tar xzf ${CMAKE_BINARY_DIR}/_deps/${archive}
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src)
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file(GLOB TARGET_SOURCE "${CMAKE_BINARY_DIR}/_deps/src/${basedir}*")
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list(LENGTH TARGET_SOURCE _num)
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if(_num GREATER 1)
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message(FATAL_ERROR "Inconsistent ${target} library sources. "
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"Please delete ${CMAKE_BINARY_DIR}/_deps/src and re-run cmake")
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endif()
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file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/_deps/${target}-src)
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file(RENAME ${TARGET_SOURCE} ${CMAKE_BINARY_DIR}/_deps/${target}-src)
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if(NOT (cmakefile STREQUAL ""))
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file(COPY ${cmakefile} DESTINATION ${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/)
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get_filename_component(_cmakefile ${cmakefile} NAME)
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file(RENAME "${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/${_cmakefile}"
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"${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/CMakeLists.txt")
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endif()
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add_subdirectory("${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}"
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"${CMAKE_BINARY_DIR}/_deps/${target}-build")
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endfunction(ExternalCMakeProject)
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