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122 lines
4.7 KiB
CMake
122 lines
4.7 KiB
CMake
# Compiler
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if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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message (FATAL_ERROR "Compiler ${CMAKE_CXX_COMPILER_ID} is not supported")
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endif ()
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# Print details to output
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execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE COMPILER_SELF_IDENTIFICATION OUTPUT_STRIP_TRAILING_WHITESPACE)
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message (STATUS "Using compiler:\n${COMPILER_SELF_IDENTIFICATION}")
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# Require minimum compiler versions
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set (CLANG_MINIMUM_VERSION 16)
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set (XCODE_MINIMUM_VERSION 12.0)
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set (APPLE_CLANG_MINIMUM_VERSION 12.0.0)
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if (CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
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# (Experimental!) Specify "-DALLOW_APPLECLANG=ON" when running CMake configuration step, if you want to experiment with using it.
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if (NOT ALLOW_APPLECLANG AND NOT DEFINED ENV{ALLOW_APPLECLANG})
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message (FATAL_ERROR "Compilation with AppleClang is unsupported. Please use vanilla Clang, e.g. from Homebrew.")
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endif ()
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# For a mapping between XCode / AppleClang / vanilla Clang versions, see https://en.wikipedia.org/wiki/Xcode
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if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${APPLE_CLANG_MINIMUM_VERSION})
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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}).")
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endif ()
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else ()
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if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${CLANG_MINIMUM_VERSION})
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message (FATAL_ERROR "Compilation with Clang version ${CMAKE_CXX_COMPILER_VERSION} is unsupported, the minimum required version is ${CLANG_MINIMUM_VERSION}.")
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endif ()
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endif ()
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string (REGEX MATCHALL "[0-9]+" COMPILER_VERSION_LIST ${CMAKE_CXX_COMPILER_VERSION})
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list (GET COMPILER_VERSION_LIST 0 COMPILER_VERSION_MAJOR)
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# Linker
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option (LINKER_NAME "Linker name or full path")
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if (LINKER_NAME MATCHES "gold")
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message (FATAL_ERROR "Linking with gold is unsupported. Please use lld.")
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endif ()
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if (NOT LINKER_NAME)
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if (OS_LINUX AND NOT ARCH_S390X)
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find_program (LLD_PATH NAMES "ld.lld-${COMPILER_VERSION_MAJOR}" "ld.lld")
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elseif (OS_DARWIN)
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find_program (LLD_PATH NAMES "ld")
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endif ()
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if (LLD_PATH)
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if (OS_LINUX OR OS_DARWIN)
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# Clang driver simply allows full linker path.
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set (LINKER_NAME ${LLD_PATH})
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endif ()
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endif()
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endif()
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if (LINKER_NAME)
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find_program (LLD_PATH NAMES ${LINKER_NAME})
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if (NOT LLD_PATH)
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message (FATAL_ERROR "Using linker ${LINKER_NAME} but can't find its path.")
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endif ()
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set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --ld-path=${LLD_PATH}")
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endif ()
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if (LINKER_NAME)
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message(STATUS "Using linker: ${LINKER_NAME}")
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elseif (NOT ARCH_S390X AND NOT OS_FREEBSD)
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message (FATAL_ERROR "The only supported linker is LLVM's LLD, but we cannot find it.")
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else ()
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message(STATUS "Using linker: <default>")
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endif ()
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# Archiver
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find_program (LLVM_AR_PATH NAMES "llvm-ar-${COMPILER_VERSION_MAJOR}" "llvm-ar")
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if (LLVM_AR_PATH)
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set (CMAKE_AR "${LLVM_AR_PATH}")
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endif ()
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message(STATUS "Using archiver: ${CMAKE_AR}")
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# Ranlib
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find_program (LLVM_RANLIB_PATH NAMES "llvm-ranlib-${COMPILER_VERSION_MAJOR}" "llvm-ranlib")
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if (LLVM_RANLIB_PATH)
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set (CMAKE_RANLIB "${LLVM_RANLIB_PATH}")
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endif ()
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message(STATUS "Using ranlib: ${CMAKE_RANLIB}")
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# Install Name Tool
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find_program (LLVM_INSTALL_NAME_TOOL_PATH NAMES "llvm-install-name-tool-${COMPILER_VERSION_MAJOR}" "llvm-install-name-tool")
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if (LLVM_INSTALL_NAME_TOOL_PATH)
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set (CMAKE_INSTALL_NAME_TOOL "${LLVM_INSTALL_NAME_TOOL_PATH}")
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endif ()
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message(STATUS "Using install-name-tool: ${CMAKE_INSTALL_NAME_TOOL}")
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# Objcopy
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find_program (OBJCOPY_PATH NAMES "llvm-objcopy-${COMPILER_VERSION_MAJOR}" "llvm-objcopy" "objcopy")
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if (OBJCOPY_PATH)
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message (STATUS "Using objcopy: ${OBJCOPY_PATH}")
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else ()
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message (FATAL_ERROR "Cannot find objcopy.")
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endif ()
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# Strip
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find_program (STRIP_PATH NAMES "llvm-strip-${COMPILER_VERSION_MAJOR}" "llvm-strip" "strip")
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if (STRIP_PATH)
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message (STATUS "Using strip: ${STRIP_PATH}")
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else ()
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message (FATAL_ERROR "Cannot find strip.")
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endif ()
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if (OS_DARWIN AND NOT CMAKE_TOOLCHAIN_FILE)
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# utils/list-licenses/list-licenses.sh (which generates system table system.licenses) needs the GNU versions of find and grep. These are
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# 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
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# available.
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find_program(GFIND_PATH NAMES "gfind")
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if (NOT GFIND_PATH)
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message (FATAL_ERROR "GNU find not found. You can install it with 'brew install findutils'.")
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endif()
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find_program(GGREP_PATH NAMES "ggrep")
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if (NOT GGREP_PATH)
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message (FATAL_ERROR "GNU grep not found. You can install it with 'brew install grep'.")
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endif()
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endif ()
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