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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
# This module is shared by multiple linkers; use include blocker.
include_guard()
block(SCOPE_FOR POLICIES)
cmake_policy(SET CMP0140 NEW)
function(__linker_gnu lang)
# define flags for linker depfile generation
set(CMAKE_${lang}_LINKER_DEPFILE_FLAGS "LINKER:--dependency-file=<DEP_FILE>")
set(CMAKE_${lang}_LINKER_DEPFILE_FORMAT gcc)
if(NOT CMAKE_EXECUTABLE_FORMAT STREQUAL "ELF")
# Only ELF binary format supports this capability
set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE)
endif()
if(NOT DEFINED CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED)
## Ensure ninja tool is recent enough...
if(CMAKE_GENERATOR MATCHES "^Ninja")
# Ninja 1.10 or upper is required
execute_process(COMMAND "${CMAKE_MAKE_PROGRAM}" --version
OUTPUT_VARIABLE _ninja_version
ERROR_VARIABLE _ninja_version)
if (_ninja_version MATCHES "[0-9]+(\\.[0-9]+)*")
set (_ninja_version "${CMAKE_MATCH_0}")
endif()
if (_ninja_version VERSION_LESS "1.10")
set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE)
endif()
endif()
if (NOT DEFINED CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED)
## check if this feature is supported by the linker
if (CMAKE_${lang}_COMPILER_LINKER AND CMAKE_${lang}_COMPILER_LINKER_ID MATCHES "GNU|LLD")
execute_process(COMMAND "${CMAKE_${lang}_COMPILER_LINKER}" --help
OUTPUT_VARIABLE _linker_capabilities
ERROR_VARIABLE _linker_capabilities)
if(_linker_capabilities MATCHES "--dependency-file")
set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED TRUE)
else()
set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE)
endif()
else()
set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE)
endif()
endif()
endif()
if (CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED)
set(CMAKE_${lang}_LINK_DEPENDS_USE_LINKER TRUE)
else()
set(CMAKE_${lang}_LINK_DEPENDS_USE_LINKER FALSE)
endif()
# Due to GNU binutils ld bug when LTO is enabled (see GNU bug
# `30568 <https://sourceware.org/bugzilla/show_bug.cgi?id=30568>`_),
# deactivate this feature if the version is less than 2.41.
if (CMAKE_${lang}_COMPILER_LINKER_ID
AND CMAKE_${lang}_COMPILER_LINKER_ID STREQUAL "GNU"
AND CMAKE_${lang}_COMPILER_LINKER_VERSION VERSION_LESS "2.41")
set(CMAKE_${lang}_LINK_DEPENDS_USE_LINKER FALSE)
endif()
# Linker warning as error
set(CMAKE_${lang}_LINK_OPTIONS_WARNING_AS_ERROR "LINKER:--fatal-warnings")
return(PROPAGATE CMAKE_${lang}_LINKER_DEPFILE_FLAGS
CMAKE_${lang}_LINKER_DEPFILE_FORMAT
CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED
CMAKE_${lang}_LINK_DEPENDS_USE_LINKER
CMAKE_${lang}_LINK_OPTIONS_WARNING_AS_ERROR)
endfunction()
endblock()
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