forked from OSchip/llvm-project
139 lines
4.6 KiB
CMake
139 lines
4.6 KiB
CMake
# In general, a flag is a string provided for supported functions under the
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# multi-valued option `FLAGS`. It should be one of the following forms:
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# FLAG_NAME
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# FLAG_NAME__NO
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# FLAG_NAME__ONLY
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# A target will inherit all the flags of its upstream dependency.
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#
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# When we create a target `TARGET_NAME` with a flag using (add_header_library,
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# add_object_library, ...), its behavior will depend on the flag form as follow:
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# - FLAG_NAME: The following 2 targets will be generated:
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# `TARGET_NAME` that has `FLAG_NAME` in its `FLAGS` property.
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# `TARGET_NAME.__NO_FLAG_NAME` that depends on `DEP.__NO_FLAG_NAME` if
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# `TARGET_NAME` depends on `DEP` and `DEP` has `FLAG_NAME` in its `FLAGS`
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# property.
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# - FLAG_NAME__ONLY: Only generate 1 target `TARGET_NAME` that has `FLAG_NAME`
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# in its `FLAGS` property.
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# - FLAG_NAME__NO: Only generate 1 target `TARGET_NAME` that depends on
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# `DEP.__NO_FLAG_NAME` if `DEP` is in its DEPENDS list and `DEP` has `FLAG_NAME`
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# in its `FLAGS` property.
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#
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# To show all the targets generated, pass SHOW_INTERMEDIATE_OBJECTS=ON to cmake.
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# To show all the targets' dependency and flags, pass
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# SHOW_INTERMEDIATE_OBJECTS=DEPS to cmake.
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#
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# To completely disable a flag FLAG_NAME expansion, set the variable
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# SKIP_FLAG_EXPANSION_FLAG_NAME=TRUE in this file.
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function(extract_flag_modifier input_flag output_flag modifier)
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if(${input_flag} MATCHES "__NO$")
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string(REGEX REPLACE "__NO$" "" flag "${input_flag}")
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set(${output_flag} ${flag} PARENT_SCOPE)
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set(${modifier} "NO" PARENT_SCOPE)
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elseif(${input_flag} MATCHES "__ONLY$")
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string(REGEX REPLACE "__ONLY$" "" flag "${input_flag}")
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set(${output_flag} ${flag} PARENT_SCOPE)
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set(${modifier} "ONLY" PARENT_SCOPE)
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else()
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set(${output_flag} ${input_flag} PARENT_SCOPE)
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set(${modifier} "" PARENT_SCOPE)
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endif()
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endfunction(extract_flag_modifier)
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function(remove_duplicated_flags input_flags output_flags)
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set(out_flags "")
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foreach(input_flag IN LISTS input_flags)
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if(NOT input_flag)
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continue()
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endif()
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extract_flag_modifier(${input_flag} flag modifier)
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# Check if the flag is skipped.
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if(${SKIP_FLAG_EXPANSION_${flag}})
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if("${SHOW_INTERMEDIATE_OBJECTS}" STREQUAL "DEPS")
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message(STATUS " Flag ${flag} is ignored.")
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endif()
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continue()
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endif()
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set(found FALSE)
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foreach(out_flag IN LISTS out_flags)
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extract_flag_modifier(${out_flag} o_flag o_modifier)
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if("${flag}" STREQUAL "${o_flag}")
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set(found TRUE)
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break()
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endif()
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endforeach()
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if(NOT found)
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list(APPEND out_flags ${input_flag})
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endif()
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endforeach()
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set(${output_flags} "${out_flags}" PARENT_SCOPE)
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endfunction(remove_duplicated_flags)
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# Collect flags from dependency list. To see which flags come with each
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# dependence, pass `SHOW_INTERMEDIATE_OBJECTS=DEPS` to cmake.
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function(get_flags_from_dep_list output_list)
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set(flag_list "")
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foreach(dep IN LISTS ARGN)
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if(NOT dep)
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continue()
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endif()
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get_fq_dep_name(fq_dep_name ${dep})
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if(NOT TARGET ${fq_dep_name})
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continue()
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endif()
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get_target_property(flags ${fq_dep_name} "FLAGS")
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if(flags AND "${SHOW_INTERMEDIATE_OBJECTS}" STREQUAL "DEPS")
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message(STATUS " FLAGS from dependency ${fq_dep_name} are ${flags}")
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endif()
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foreach(flag IN LISTS flags)
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if(flag)
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list(APPEND flag_list ${flag})
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endif()
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endforeach()
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endforeach(dep)
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list(REMOVE_DUPLICATES flag_list)
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set(${output_list} ${flag_list} PARENT_SCOPE)
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endfunction(get_flags_from_dep_list)
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# Given a `flag` without modifier, scan through the list of dependency, append
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# `.__NO_flag` to any target that has `flag` in its FLAGS property.
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function(get_fq_dep_list_without_flag output_list flag)
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set(fq_dep_no_flag_list "")
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foreach(dep IN LISTS ARGN)
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get_fq_dep_name(fq_dep_name ${dep})
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if(TARGET ${fq_dep_name})
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get_target_property(dep_flags ${fq_dep_name} "FLAGS")
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# Only target with `flag` has `.__NO_flag` target, `flag__NO` and
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# `flag__ONLY` do not.
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if(${flag} IN_LIST dep_flags)
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list(APPEND fq_dep_no_flag_list "${fq_dep_name}.__NO_${flag}")
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else()
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list(APPEND fq_dep_no_flag_list ${fq_dep_name})
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endif()
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else()
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list(APPEND fq_dep_no_flag_list ${fq_dep_name})
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endif()
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endforeach(dep)
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set(${output_list} ${fq_dep_no_flag_list} PARENT_SCOPE)
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endfunction(get_fq_dep_list_without_flag)
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# Special flags
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set(FMA_OPT_FLAG "FMA_OPT")
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# Skip FMA_OPT flag for targets that don't support fma.
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if(NOT(LIBC_TARGET_ARCHITECTURE_IS_X86 AND (LIBC_CPU_FEATURES MATCHES "FMA")))
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set(SKIP_FLAG_EXPANSION_FMA_OPT TRUE)
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endif()
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