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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# Do NOT include this module directly into any of your code. It is used by
# the try_compile() implementation to work around a specific issue with
# conflicting flags when building for Apple platforms.
if(NOT APPLE)
return()
endif()
cmake_policy(PUSH)
cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
function(__cmake_internal_workaround_headerpad_flag_conflict _LANG)
# Until we can avoid hard-coding -Wl,-headerpad_max_install_names in the
# linker flags, we need to remove it here for cases where we know it will
# conflict with other flags, generate a warning and be ignored.
set(regex "(^| )(-fembed-bitcode(-marker|=(all|bitcode|marker))?|-bundle_bitcode)($| )")
set(remove_headerpad NO)
# Check arbitrary flags that the user or project has set. These compiler
# flags get added to the linker command line.
if("${CMAKE_${_LANG}_FLAGS}" MATCHES "${regex}")
set(remove_headerpad YES)
endif()
if(NOT remove_headerpad)
get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
if(is_multi_config)
# Only one of these config-specific variables will be set by try_compile()
# and the rest will be unset, but we can't easily tell which one is set.
# No harm to just add them all here, empty ones won't add flags to check.
foreach(config IN LISTS CMAKE_CONFIGURATION_TYPES)
if("${CMAKE_${_LANG}_FLAGS_${config}}" MATCHES "${regex}")
set(remove_headerpad YES)
break()
endif()
endforeach()
else()
if("${CMAKE_${_LANG}_FLAGS_${CMAKE_BUILD_TYPE}}" MATCHES "${regex}")
set(remove_headerpad YES)
endif()
endif()
endif()
# The try_compile() command passes compiler flags to check in a way that
# results in them being added to add_definitions(). Those don't end up on
# the linker command line, so we don't need to check them here.
if(remove_headerpad)
foreach(flag IN ITEMS
CMAKE_${_LANG}_LINK_FLAGS
CMAKE_SHARED_LIBRARY_CREATE_${_LANG}_FLAGS
CMAKE_SHARED_MODULE_CREATE_${_LANG}_FLAGS)
string(REPLACE "-Wl,-headerpad_max_install_names" "" ${flag} "${${flag}}")
set(${flag} "${${flag}}" PARENT_SCOPE)
endforeach()
endif()
endfunction()
get_property(__enabled_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
foreach(__lang IN LISTS __enabled_languages)
__cmake_internal_workaround_headerpad_flag_conflict(${__lang})
endforeach()
unset(__lang)
unset(__enabled_languages)
cmake_policy(POP)