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