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# SPDX-License-Identifier: Apache-2.0
#
# Copyright (c) 2022, Nordic Semiconductor ASA
# Copyright (c) 2023, Intel Corporation
# FindGnuLd module for locating GNU ld (linker from binutils).
#
# The module defines the following variables:
#
# 'GNULD_LINKER'
# Path to GNU ld linker
# Set to 'GNULD_LINKER-NOTFOUND' if ld was not found.
#
# 'GnuLd_FOUND', 'GNULD_FOUND'
# True if GNU ld was found.
#
# 'GNULD_VERSION_STRING'
# The version of GNU ld.
#
# 'GNULD_LINKER_IS_BFD'
# True if linker is ld.bfd (or compatible)
#
# Note that this will use CROSS_COMPILE, if defined,
# as a prefix to the linker executable.
include(FindPackageHandleStandardArgs)
# GNULD_LINKER exists on repeated builds or defined manually...
if(EXISTS "${GNULD_LINKER}")
if(NOT DEFINED GNULD_LINKER_IS_BFD)
# ... issue warning if GNULD_LINKER_IS_BFD is not already set.
message(
WARNING
"GNULD_LINKER specified directly in cache, but GNULD_LINKER_IS_BFD is not "
"defined. Assuming GNULD_LINKER_IS_BFD as OFF, please set GNULD_LINKER_IS_BFD "
"to correct value in cache to silence this warning"
)
set(GNULD_LINKER_IS_BFD OFF)
endif()
# Since GNULD_LINKER already exists, there is no need to find it again (below).
return()
endif()
# See if the compiler has a preferred linker
execute_process(COMMAND ${CMAKE_C_COMPILER} --print-prog-name=ld.bfd
OUTPUT_VARIABLE GNULD_LINKER
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(EXISTS "${GNULD_LINKER}")
set(GNULD_LINKER_IS_BFD ON CACHE BOOL "Linker BFD compatibility (compiler reported)" FORCE)
else()
# Need to clear it or else find_program() won't replace the value.
set(GNULD_LINKER)
if(DEFINED TOOLCHAIN_HOME)
# Search for linker under TOOLCHAIN_HOME if it is defined
# to limit which linker to use, or else we would be using
# host tools.
set(LD_SEARCH_PATH PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
endif()
find_program(GNULD_LINKER ${CROSS_COMPILE}ld.bfd ${LD_SEARCH_PATH})
if(GNULD_LINKER)
set(GNULD_LINKER_IS_BFD ON CACHE BOOL "Linker BFD compatibility (inferred from binary)" FORCE)
else()
find_program(GNULD_LINKER ${CROSS_COMPILE}ld ${LD_SEARCH_PATH})
set(GNULD_LINKER_IS_BFD OFF CACHE BOOL "Linker BFD compatibility (inferred from binary)" FORCE)
endif()
endif()
if(GNULD_LINKER)
# Parse the 'ld.bfd --version' output to find the installed version.
execute_process(
COMMAND
${GNULD_LINKER} --version
OUTPUT_VARIABLE gnuld_version_output
ERROR_VARIABLE gnuld_error_output
RESULT_VARIABLE gnuld_status
)
if(${gnuld_status} EQUAL 0)
# Extract GNU ld version. Different distros have their
# own version scheme so we need to account for that.
# Examples:
# - "GNU ld (GNU Binutils for Ubuntu) 2.34"
# - "GNU ld (Zephyr SDK 0.15.2) 2.38"
# - "GNU ld (Gentoo 2.39 p5) 2.39.0"
string(REGEX MATCH
"GNU ld \\(.+\\) ([0-9]+[.][0-9]+[.]?[0-9]*).*"
out_var ${gnuld_version_output})
set(GNULD_VERSION_STRING ${CMAKE_MATCH_1} CACHE STRING "GNU ld version" FORCE)
endif()
endif()
find_package_handle_standard_args(GnuLd
REQUIRED_VARS GNULD_LINKER
VERSION_VAR GNULD_VERSION_STRING
)