myx-cmake/MyxCMake/functions/MyxCMakeRemoveFlag.cmake

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2021-12-08 11:32:04 +00:00
# https://stackoverflow.com/a/49216539
#
# Removes the specified compile flag from the specified target.
# _target - The target to remove the compile flag from
# _flag - The compile flag to remove
#
# Pre: apply_global_cxx_flags_to_all_targets() must be invoked.
#
# cmake-lint: disable=C0103
macro(myx_cmake_remove_flag_from_target _target _flag)
get_target_property(_target_cxx_flags ${_target} COMPILE_OPTIONS)
if(_target_cxx_flags)
list(REMOVE_ITEM _target_cxx_flags ${_flag})
set_target_properties(${_target} PROPERTIES COMPILE_OPTIONS "${_target_cxx_flags}")
endif()
endmacro()
#
# Removes the specified compiler flag from the specified file.
# _target - The target that _file belongs to
# _file - The file to remove the compiler flag from
# _flag - The compiler flag to remove.
#
# Pre: apply_global_cxx_flags_to_all_targets() must be invoked.
#
# cmake-lint: disable=C0103
macro(myx_cmake_remove_flag_from_file _target _file _flag)
get_target_property(_target_sources ${_target} SOURCES)
# Check if a sync is required, in which case we'll force a rewrite of the cache variables.
if(_flag_sync_required)
unset(_cached_${_target}_cxx_flags CACHE)
unset(_cached_${_target}_${_file}_cxx_flags CACHE)
endif()
get_target_property(_${_target}_cxx_flags ${_target} COMPILE_OPTIONS)
# On first entry, cache the target compile flags and apply them to each source file
# in the target.
if(NOT _cached_${_target}_cxx_flags)
# Obtain and cache the target compiler options, then clear them.
get_target_property(_target_cxx_flags ${_target} COMPILE_OPTIONS)
set(_cached_${_target}_cxx_flags "${_target_cxx_flags}" CACHE INTERNAL "")
set_target_properties(${_target} PROPERTIES COMPILE_OPTIONS "")
# Apply the target compile flags to each source file.
foreach(_source_file ${_target_sources})
# Check for pre-existing flags set by set_source_files_properties().
get_source_file_property(_source_file_cxx_flags ${_source_file} COMPILE_FLAGS)
if(_source_file_cxx_flags)
separate_arguments(_source_file_cxx_flags UNIX_COMMAND ${_source_file_cxx_flags})
list(APPEND _source_file_cxx_flags "${_target_cxx_flags}")
else()
set(_source_file_cxx_flags "${_target_cxx_flags}")
endif()
# Apply the compile flags to the current source file.
string(REPLACE ";" " " _source_file_cxx_flags_string "${_source_file_cxx_flags}")
set_source_files_properties(${_source_file} PROPERTIES COMPILE_FLAGS "${_source_file_cxx_flags_string}")
endforeach()
endif()
list(FIND _target_sources ${_file} _file_found_at)
if(_file_found_at GREATER -1)
if(NOT _cached_${_target}_${_file}_cxx_flags)
# Cache the compile flags for the specified file.
# This is the list that we'll be removing flags from.
get_source_file_property(_source_file_cxx_flags ${_file} COMPILE_FLAGS)
separate_arguments(_source_file_cxx_flags UNIX_COMMAND ${_source_file_cxx_flags})
set(_cached_${_target}_${_file}_cxx_flags ${_source_file_cxx_flags} CACHE INTERNAL "")
endif()
# Remove the specified flag, then re-apply the rest.
list(REMOVE_ITEM _cached_${_target}_${_file}_cxx_flags ${_flag})
string(REPLACE ";" " " _cached_${_target}_${_file}_cxx_flags_string
"${_cached_${_target}_${_file}_cxx_flags}")
set_source_files_properties(${_file} PROPERTIES COMPILE_FLAGS
"${_cached_${_target}_${_file}_cxx_flags_string}")
endif()
endmacro()