ccls/cmake/DownloadAndExtractClang.cmake
2019-10-24 18:37:35 -07:00

130 lines
4.3 KiB
CMake

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