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130 lines
4.3 KiB
CMake
130 lines
4.3 KiB
CMake
# Downloads and extracts the Clang archive for the current system from
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# https://releases.llvm.org
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#
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# Returns the extracted Clang archive directory in DOWNLOADED_CLANG_DIR
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#
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# Downloads 7-Zip to extract Clang if it isn't available in the PATH
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function(download_and_extract_clang CLANG_DOWNLOAD_LOCATION)
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set(CLANG_VERSION 7.0.0)
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set(CLANG_ARCHIVE_EXT .tar.xz)
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if(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
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# Default to Ubuntu 16.04
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set(CLANG_ARCHIVE_NAME
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clang+llvm-${CLANG_VERSION}-x86_64-linux-gnu-ubuntu-16.04)
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elseif(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
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set(CLANG_ARCHIVE_NAME clang+llvm-${CLANG_VERSION}-x86_64-apple-darwin)
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elseif(${CMAKE_SYSTEM_NAME} STREQUAL Windows)
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set(CLANG_ARCHIVE_NAME LLVM-${CLANG_VERSION}-win64)
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set(CLANG_ARCHIVE_EXT .exe)
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elseif(${CMAKE_SYSTEM_NAME} STREQUAL FreeBSD)
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set(CLANG_ARCHIVE_NAME clang+llvm-${CLANG_VERSION}-amd64-unknown-freebsd11)
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endif()
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set(CLANG_ARCHIVE_FULL_NAME ${CLANG_ARCHIVE_NAME}${CLANG_ARCHIVE_EXT})
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set(CLANG_ARCHIVE_FILE ${CLANG_DOWNLOAD_LOCATION}/${CLANG_ARCHIVE_FULL_NAME})
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set(CLANG_ARCHIVE_EXTRACT_DIR ${CLANG_DOWNLOAD_LOCATION}/${CLANG_ARCHIVE_NAME})
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set(CLANG_ARCHIVE_URL
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https://releases.llvm.org/${CLANG_VERSION}/${CLANG_ARCHIVE_FULL_NAME})
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set(CLANG_ARCHIVE_HASH_FILE
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${CMAKE_SOURCE_DIR}/clang_archive_hashes/${CLANG_ARCHIVE_FULL_NAME}.SHA256)
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# Exit if Clang is already downloaded and extracted
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set(CLANG_ROOT ${CLANG_ARCHIVE_EXTRACT_DIR})
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find_package(Clang ${CLANG_VERSION} QUIET)
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if(Clang_FOUND)
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message(STATUS "Clang already downloaded")
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set(DOWNLOADED_CLANG_DIR ${CLANG_ARCHIVE_EXTRACT_DIR} PARENT_SCOPE)
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return()
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endif()
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if(NOT CLANG_ARCHIVE_NAME)
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message(FATAL_ERROR "No Clang archive url specified for current platform \
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(${CMAKE_SYSTEM_NAME}). Please file an issue to get it added.")
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endif()
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if(NOT EXISTS ${CLANG_ARCHIVE_HASH_FILE})
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message(FATAL_ERROR "No SHA256 hash available for the current platform \
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(${CMAKE_SYSTEM_NAME}) + clang version (${CLANG_VERSION}) combination. Please \
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file an issue to get it added.")
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endif()
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# Download Clang archive
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message(STATUS "Downloading Clang ${CLANG_VERSION} (${CLANG_ARCHIVE_URL}) ...")
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file(DOWNLOAD ${CLANG_ARCHIVE_URL} ${CLANG_ARCHIVE_FILE}
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STATUS CLANG_ARCHIVE_DOWNLOAD_RESULT)
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# Abort if download failed
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list(GET ${CLANG_ARCHIVE_DOWNLOAD_RESULT} 0 ERROR_CODE)
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if(${ERROR_CODE})
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list(GET ${CLANG_ARCHIVE_DOWNLOAD_RESULT} 1 ERROR_STRING)
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message(FATAL_ERROR ${ERROR_STRING})
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endif()
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# Retrieve expected hash from file and strip newline
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file(READ ${CLANG_ARCHIVE_HASH_FILE} CLANG_ARCHIVE_EXPECTED_HASH)
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string(STRIP ${CLANG_ARCHIVE_EXPECTED_HASH} CLANG_ARCHIVE_EXPECTED_HASH)
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# Calculate actual hash
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file(SHA256 ${CLANG_ARCHIVE_FILE} CLANG_ARCHIVE_HASH)
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# Abort if hashes do not match
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if(NOT ${CLANG_ARCHIVE_EXPECTED_HASH} STREQUAL ${CLANG_ARCHIVE_HASH})
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message(FATAL_ERROR "SHA256 hash of downloaded Clang does not match \
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expected hash. Remove the build directory and try running CMake again. If this \
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keeps happening, file an issue to report the problem.")
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endif()
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if(${CLANG_ARCHIVE_EXT} STREQUAL .exe)
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# Download and extract 7-zip if not found in PATH
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find_program(7ZIP_EXECUTABLE 7z)
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if(NOT 7ZIP_EXECUTABLE)
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message(STATUS "7-Zip not found in PATH")
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include(DownloadAndExtract7zip)
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download_and_extract_7zip(${CLANG_DOWNLOAD_LOCATION})
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find_program(7ZIP_EXECUTABLE
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NAMES 7z
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NO_DEFAULT_PATH
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PATHS ${DOWNLOADED_7ZIP_DIR}
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)
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else()
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message(STATUS "7-Zip found in PATH")
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endif()
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message(STATUS "Extracting downloaded Clang with 7-Zip ...")
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# Avoid running the Clang installer by extracting the exe with 7-Zip
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execute_process(
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COMMAND ${7ZIP_EXECUTABLE} x
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-o${CLANG_ARCHIVE_EXTRACT_DIR}
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-xr!$PLUGINSDIR ${CLANG_ARCHIVE_FILE}
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WORKING_DIRECTORY ${CLANG_DOWNLOAD_LOCATION}
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OUTPUT_QUIET
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)
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elseif(${CLANG_ARCHIVE_EXT} STREQUAL .tar.xz)
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message(STATUS "Extracting downloaded Clang with CMake built-in tar ...")
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# CMake has builtin support for tar via the -E flag
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execute_process(
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COMMAND ${CMAKE_COMMAND} -E tar -xf ${CLANG_ARCHIVE_FILE}
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# Specify working directory to allow running cmake from
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# everywhere
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# (example: cmake -H"$HOME/cquery" -B"$home/cquery/build")
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WORKING_DIRECTORY ${CLANG_DOWNLOAD_LOCATION}
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OUTPUT_QUIET
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)
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endif()
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set(DOWNLOADED_CLANG_DIR ${CLANG_ARCHIVE_EXTRACT_DIR} PARENT_SCOPE)
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endfunction()
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