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# Build a CMake based external library as subdirectory.
# The sources will be unpacked to ${CMAKE_BINARY_DIR}/_deps/${target}-src
# The binaries will be built in ${CMAKE_BINARY_DIR}/_deps/${target}-build
#
function(ExternalCMakeProject target url hash basedir cmakedir cmakefile)
# change settings locally
set(BUILD_SHARED_LIBS OFF)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
get_filename_component(archive ${url} NAME)
file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src)
if(EXISTS ${CMAKE_BINARY_DIR}/_deps/${archive})
file(MD5 ${CMAKE_BINARY_DIR}/_deps/${archive} DL_MD5)
endif()
if(NOT "${DL_MD5}" STREQUAL "${hash}")
message(STATUS "Downloading ${url}")
file(DOWNLOAD ${url} ${CMAKE_BINARY_DIR}/_deps/${archive} STATUS DL_STATUS SHOW_PROGRESS)
file(MD5 ${CMAKE_BINARY_DIR}/_deps/${archive} DL_MD5)
if((NOT DL_STATUS EQUAL 0) OR (NOT "${DL_MD5}" STREQUAL "${hash}"))
set(${target}_URL ${url})
GetFallbackURL(${target}_URL fallback)
message(WARNING "Download from primary URL ${url} failed\nTrying fallback URL ${fallback}")
file(DOWNLOAD ${fallback} ${CMAKE_BINARY_DIR}/_deps/${archive} EXPECTED_HASH MD5=${hash} SHOW_PROGRESS)
endif()
else()
message(STATUS "Using already downloaded archive ${CMAKE_BINARY_DIR}/_deps/${archive}")
endif()
message(STATUS "Unpacking and configuring ${archive}")
execute_process(COMMAND ${CMAKE_COMMAND} -E tar xzf ${CMAKE_BINARY_DIR}/_deps/${archive}
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src)
file(GLOB TARGET_SOURCE "${CMAKE_BINARY_DIR}/_deps/src/${basedir}*")
list(LENGTH TARGET_SOURCE _num)
if(_num GREATER 1)
message(FATAL_ERROR "Inconsistent ${target} library sources. "
"Please delete ${CMAKE_BINARY_DIR}/_deps/src and re-run cmake")
endif()
file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/_deps/${target}-src)
file(RENAME ${TARGET_SOURCE} ${CMAKE_BINARY_DIR}/_deps/${target}-src)
if(NOT (cmakefile STREQUAL ""))
file(COPY ${cmakefile} DESTINATION ${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/)
get_filename_component(_cmakefile ${cmakefile} NAME)
file(RENAME "${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/${_cmakefile}"
"${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}/CMakeLists.txt")
endif()
add_subdirectory("${CMAKE_BINARY_DIR}/_deps/${target}-src/${cmakedir}"
"${CMAKE_BINARY_DIR}/_deps/${target}-build" EXCLUDE_FROM_ALL)
endfunction(ExternalCMakeProject)
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