73 lines
2.2 KiB
CMake
73 lines
2.2 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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#
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# Copyright (c) 2022, Nordic Semiconductor ASA
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# Copyright (c) 2023, Intel Corporation
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# FindGnuLd module for locating LLVM lld linker.
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#
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# The module defines the following variables:
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#
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# 'LLVMLLD_LINKER'
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# Path to LLVM lld linker
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# Set to 'LLVMLLD_LINKER-NOTFOUND' if ld was not found.
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#
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# 'LlvmLld_FOUND', 'LLVMLLD_FOUND'
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# True if LLVM lld was found.
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#
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# 'LLVMLLD_VERSION_STRING'
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# The version of LLVM lld.
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include(FindPackageHandleStandardArgs)
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# See if the compiler has a preferred linker
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execute_process(COMMAND ${CMAKE_C_COMPILER} --print-prog-name=ld.lld
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OUTPUT_VARIABLE LLVMLLD_LINKER
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(NOT EXISTS "${LLVMLLD_LINKER}")
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# Need to clear it or else find_program() won't replace the value.
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set(LLVMLLD_LINKER)
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if(DEFINED TOOLCHAIN_HOME)
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# Search for linker under TOOLCHAIN_HOME if it is defined
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# to limit which linker to use, or else we would be using
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# host tools.
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set(LLD_SEARCH_PATH PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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endif()
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# Note that, although there is lld, it cannot be used directly
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# as it would complain about it not being a generic linker,
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# and asks you to use ld.lld instead. So do not search for lld.
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find_program(LLVMLLD_LINKER ld.lld ${LLD_SEARCH_PATH})
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endif()
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if(LLVMLLD_LINKER)
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# Parse the 'ld.lld --version' output to find the installed version.
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execute_process(
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COMMAND
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${LLVMLLD_LINKER} --version
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OUTPUT_VARIABLE llvmlld_version_output
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ERROR_VARIABLE llvmlld_error_output
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RESULT_VARIABLE llvmlld_status
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)
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set(LLVMLLD_VERSION_STRING)
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if(${llvmlld_status} EQUAL 0)
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# Extract GNU ld version. Different distros have their
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# own version scheme so we need to account for that.
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# Examples:
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# - "GNU ld (GNU Binutils for Ubuntu) 2.34"
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# - "GNU ld (Zephyr SDK 0.15.2) 2.38"
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# - "GNU ld (Gentoo 2.39 p5) 2.39.0"
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string(REGEX MATCH
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"LLD ([0-9]+[.][0-9]+[.]?[0-9]*).*"
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out_var ${llvmlld_version_output})
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set(LLVMLLD_VERSION_STRING ${CMAKE_MATCH_1})
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endif()
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endif()
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find_package_handle_standard_args(LlvmLld
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REQUIRED_VARS LLVMLLD_LINKER
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VERSION_VAR LLVMLLD_VERSION_STRING
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)
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