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tools.cmake
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tools.cmake
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# Compiler
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set (COMPILER_GCC 1)
elseif (CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
set (COMPILER_CLANG 1) # Safe to treat AppleClang as a regular Clang, in general.
elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set (COMPILER_CLANG 1)
else ()
message (FATAL_ERROR "Compiler ${CMAKE_CXX_COMPILER_ID} is not supported")
endif ()
# Print details to output
execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE COMPILER_SELF_IDENTIFICATION OUTPUT_STRIP_TRAILING_WHITESPACE)
message (STATUS "Using compiler:\n${COMPILER_SELF_IDENTIFICATION}")
# Require minimum compiler versions
set (CLANG_MINIMUM_VERSION 15)
set (XCODE_MINIMUM_VERSION 12.0)
set (APPLE_CLANG_MINIMUM_VERSION 12.0.0)
set (GCC_MINIMUM_VERSION 11)
if (COMPILER_GCC)
message (FATAL_ERROR "Compilation with GCC is unsupported. Please use Clang instead.")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${GCC_MINIMUM_VERSION})
message (FATAL_ERROR "Compilation with GCC version ${CMAKE_CXX_COMPILER_VERSION} is unsupported, the minimum required version is ${GCC_MINIMUM_VERSION}.")
endif ()
elseif (COMPILER_CLANG)
if (CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
# (Experimental!) Specify "-DALLOW_APPLECLANG=ON" when running CMake configuration step, if you want to experiment with using it.
if (NOT ALLOW_APPLECLANG AND NOT DEFINED ENV{ALLOW_APPLECLANG})
message (FATAL_ERROR "Compilation with AppleClang is unsupported. Please use vanilla Clang, e.g. from Homebrew.")
endif ()
# For a mapping between XCode / AppleClang / vanilla Clang versions, see https://en.wikipedia.org/wiki/Xcode
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${APPLE_CLANG_MINIMUM_VERSION})
message (FATAL_ERROR "Compilation with AppleClang version ${CMAKE_CXX_COMPILER_VERSION} is unsupported, the minimum required version is ${APPLE_CLANG_MINIMUM_VERSION} (Xcode ${XCODE_MINIMUM_VERSION}).")
endif ()
else ()
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${CLANG_MINIMUM_VERSION})
message (FATAL_ERROR "Compilation with Clang version ${CMAKE_CXX_COMPILER_VERSION} is unsupported, the minimum required version is ${CLANG_MINIMUM_VERSION}.")
endif ()
endif ()
endif ()
# Linker
string (REGEX MATCHALL "[0-9]+" COMPILER_VERSION_LIST ${CMAKE_CXX_COMPILER_VERSION})
list (GET COMPILER_VERSION_LIST 0 COMPILER_VERSION_MAJOR)
# Example values: `lld-10`
option (LINKER_NAME "Linker name or full path")
if (LINKER_NAME MATCHES "gold")
message (FATAL_ERROR "Linking with gold is unsupported. Please use lld.")
endif ()
if (NOT LINKER_NAME)
if (COMPILER_GCC)
find_program (LLD_PATH NAMES "ld.lld")
elseif (COMPILER_CLANG)
if (OS_LINUX)
if (NOT ARCH_S390X) # s390x doesnt support lld
find_program (LLD_PATH NAMES "ld.lld-${COMPILER_VERSION_MAJOR}" "ld.lld")
endif ()
endif ()
endif ()
if (OS_LINUX)
if (LLD_PATH)
if (COMPILER_GCC)
# GCC driver requires one of supported linker names like "lld".
set (LINKER_NAME "lld")
else ()
# Clang driver simply allows full linker path.
set (LINKER_NAME ${LLD_PATH})
endif ()
endif ()
endif()
endif()
if (LINKER_NAME)
find_program (LLD_PATH NAMES ${LINKER_NAME})
if (NOT LLD_PATH)
message (FATAL_ERROR "Using linker ${LINKER_NAME} but can't find its path.")
endif ()
if (COMPILER_CLANG)
# This a temporary quirk to emit .debug_aranges with ThinLTO, can be removed after upgrade to clang-16
set (LLD_WRAPPER "${CMAKE_CURRENT_BINARY_DIR}/ld.lld")
configure_file ("${CMAKE_CURRENT_SOURCE_DIR}/cmake/ld.lld.in" "${LLD_WRAPPER}" @ONLY)
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --ld-path=${LLD_WRAPPER}")
else ()
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=${LINKER_NAME}")
endif ()
endif ()
if (LINKER_NAME)
message(STATUS "Using linker: ${LINKER_NAME}")
else()
message(STATUS "Using linker: <default>")
endif()
# Archiver
if (COMPILER_GCC)
find_program (LLVM_AR_PATH NAMES "llvm-ar" "llvm-ar-15" "llvm-ar-14" "llvm-ar-13" "llvm-ar-12")
else ()
find_program (LLVM_AR_PATH NAMES "llvm-ar-${COMPILER_VERSION_MAJOR}" "llvm-ar")
endif ()
if (LLVM_AR_PATH)
set (CMAKE_AR "${LLVM_AR_PATH}")
endif ()
message(STATUS "Using archiver: ${CMAKE_AR}")
# Ranlib
if (COMPILER_GCC)
find_program (LLVM_RANLIB_PATH NAMES "llvm-ranlib" "llvm-ranlib-15" "llvm-ranlib-14" "llvm-ranlib-13" "llvm-ranlib-12")
else ()
find_program (LLVM_RANLIB_PATH NAMES "llvm-ranlib-${COMPILER_VERSION_MAJOR}" "llvm-ranlib")
endif ()
if (LLVM_RANLIB_PATH)
set (CMAKE_RANLIB "${LLVM_RANLIB_PATH}")
endif ()
message(STATUS "Using ranlib: ${CMAKE_RANLIB}")
# Install Name Tool
if (COMPILER_GCC)
find_program (LLVM_INSTALL_NAME_TOOL_PATH NAMES "llvm-install-name-tool" "llvm-install-name-tool-15" "llvm-install-name-tool-14" "llvm-install-name-tool-13" "llvm-install-name-tool-12")
else ()
find_program (LLVM_INSTALL_NAME_TOOL_PATH NAMES "llvm-install-name-tool-${COMPILER_VERSION_MAJOR}" "llvm-install-name-tool")
endif ()
if (LLVM_INSTALL_NAME_TOOL_PATH)
set (CMAKE_INSTALL_NAME_TOOL "${LLVM_INSTALL_NAME_TOOL_PATH}")
endif ()
message(STATUS "Using install-name-tool: ${CMAKE_INSTALL_NAME_TOOL}")
# Objcopy
if (COMPILER_GCC)
find_program (OBJCOPY_PATH NAMES "llvm-objcopy" "llvm-objcopy-15" "llvm-objcopy-14" "llvm-objcopy-13" "llvm-objcopy-12" "objcopy")
else ()
find_program (OBJCOPY_PATH NAMES "llvm-objcopy-${COMPILER_VERSION_MAJOR}" "llvm-objcopy" "objcopy")
endif ()
if (OBJCOPY_PATH)
message (STATUS "Using objcopy: ${OBJCOPY_PATH}")
else ()
message (FATAL_ERROR "Cannot find objcopy.")
endif ()
# Strip
if (COMPILER_GCC)
find_program (STRIP_PATH NAMES "llvm-strip" "llvm-strip-15" "llvm-strip-14" "llvm-strip-13" "llvm-strip-12" "strip")
else ()
find_program (STRIP_PATH NAMES "llvm-strip-${COMPILER_VERSION_MAJOR}" "llvm-strip" "strip")
endif ()
if (STRIP_PATH)
message (STATUS "Using strip: ${STRIP_PATH}")
else ()
message (FATAL_ERROR "Cannot find strip.")
endif ()
if (OS_DARWIN AND NOT CMAKE_TOOLCHAIN_FILE)
# utils/list-licenses/list-licenses.sh (which generates system table system.licenses) needs the GNU versions of find and grep. These are
# not available out-of-the-box on Mac. As a special case, Darwin builds in CI are cross-compiled from x86 Linux where the GNU userland is
# available.
find_program(GFIND_PATH NAMES "gfind")
if (NOT GFIND_PATH)
message (FATAL_ERROR "GNU find not found. You can install it with 'brew install findutils'.")
endif()
find_program(GGREP_PATH NAMES "ggrep")
if (NOT GGREP_PATH)
message (FATAL_ERROR "GNU grep not found. You can install it with 'brew install grep'.")
endif()
endif ()