94d6dd9057
Some functions like `stpncpy` are implemented in terms of `memset` but are not currently using `-fno-builtin-memset`. This is somewhat hidden by the fact that we use `-ffreestanding` globally and that `-ffreestanding` implies `-fno-builtin` for Clang. This patch also removes `-mllvm -combiner-global-alias-analysis` that is Clang specific and that does not bring substantial gains on modern processors. Also we keep `-mllvm --tail-merge-threshold=0` for aarch64 in CMakeLists.txt but we omit it in the Bazel config. This is because Bazel consumes the source files directly and so it can use PGO to take optimal decisions locally. Differential Revision: https://reviews.llvm.org/D125894
339 lines
12 KiB
CMake
339 lines
12 KiB
CMake
set(OBJECT_LIBRARY_TARGET_TYPE "OBJECT_LIBRARY")
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function(_get_common_compile_options output_var)
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set(compile_options ${LLVM_CXX_STD_default} ${LIBC_COMPILE_OPTIONS_DEFAULT} ${ARGN})
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if(NOT ${LIBC_TARGET_OS} STREQUAL "windows")
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set(compile_options ${compile_options} -fpie -ffreestanding -fno-builtin)
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endif()
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if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
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list(APPEND compile_options "-fno-exceptions")
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list(APPEND compile_options "-fno-unwind-tables")
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list(APPEND compile_options "-fno-asynchronous-unwind-tables")
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list(APPEND compile_options "-fno-rtti")
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elseif(MSVC)
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list(APPEND compile_options "/EHs-c-")
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list(APPEND compile_options "/GR-")
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endif()
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set(${output_var} ${compile_options} PARENT_SCOPE)
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endfunction()
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# Rule which is essentially a wrapper over add_library to compile a set of
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# sources to object files.
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# Usage:
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# add_object_library(
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# <target_name>
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# HDRS <list of header files>
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# SRCS <list of source files>
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# DEPENDS <list of dependencies>
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# COMPILE_OPTIONS <optional list of special compile options for this target>
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function(add_object_library target_name)
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cmake_parse_arguments(
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"ADD_OBJECT"
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"" # No optional arguments
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"CXX_STANDARD" # Single value arguments
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"SRCS;HDRS;COMPILE_OPTIONS;DEPENDS" # Multivalue arguments
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${ARGN}
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)
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if(NOT ADD_OBJECT_SRCS)
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message(FATAL_ERROR "'add_object_library' rule requires SRCS to be specified.")
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endif()
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get_fq_target_name(${target_name} fq_target_name)
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add_library(
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${fq_target_name}
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EXCLUDE_FROM_ALL
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OBJECT
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${ADD_OBJECT_SRCS}
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${ADD_OBJECT_HDRS}
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)
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target_include_directories(
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${fq_target_name}
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PRIVATE
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${LIBC_BUILD_DIR}/include
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${LIBC_SOURCE_DIR}
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${LIBC_BUILD_DIR}
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)
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_get_common_compile_options(compile_options ${ADD_OBJECT_COMPILE_OPTIONS})
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target_compile_options(${fq_target_name} PRIVATE ${compile_options})
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get_fq_deps_list(fq_deps_list ${ADD_OBJECT_DEPENDS})
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if(fq_deps_list)
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add_dependencies(${fq_target_name} ${fq_deps_list})
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endif()
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if(ADD_OBJECT_CXX_STANDARD)
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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CXX_STANDARD ${ADD_OBJECT_CXX_STANDARD}
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)
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endif()
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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"TARGET_TYPE" ${OBJECT_LIBRARY_TARGET_TYPE}
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"OBJECT_FILES" "$<TARGET_OBJECTS:${fq_target_name}>"
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"DEPS" "${fq_deps_list}"
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)
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endfunction(add_object_library)
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set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
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# A rule for entrypoint object targets.
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# Usage:
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# add_entrypoint_object(
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# <target_name>
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# [ALIAS|REDIRECTED] # Specified if the entrypoint is redirected or an alias.
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# [NAME] <the C name of the entrypoint if different from target_name>
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# SRCS <list of .cpp files>
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# HDRS <list of .h files>
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# DEPENDS <list of dependencies>
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# COMPILE_OPTIONS <optional list of special compile options for this target>
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# SPECIAL_OBJECTS <optional list of special object targets added by the rule `add_object`>
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# )
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function(add_entrypoint_object target_name)
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cmake_parse_arguments(
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"ADD_ENTRYPOINT_OBJ"
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"ALIAS;REDIRECTED" # Optional argument
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"NAME;CXX_STANDARD" # Single value arguments
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"SRCS;HDRS;DEPENDS;COMPILE_OPTIONS" # Multi value arguments
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${ARGN}
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)
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get_fq_target_name(${target_name} fq_target_name)
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set(entrypoint_name ${target_name})
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if(ADD_ENTRYPOINT_OBJ_NAME)
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set(entrypoint_name ${ADD_ENTRYPOINT_OBJ_NAME})
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endif()
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list(FIND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name} entrypoint_name_index)
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if(${entrypoint_name_index} EQUAL -1)
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add_custom_target(${fq_target_name})
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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"ENTRYPOINT_NAME" ${entrypoint_name}
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"TARGET_TYPE" ${ENTRYPOINT_OBJ_TARGET_TYPE}
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"OBJECT_FILE" ""
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"OBJECT_FILE_RAW" ""
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"DEPS" ""
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"SKIPPED" "YES"
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)
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message(STATUS "Skipping libc entrypoint ${fq_target_name}.")
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return()
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endif()
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if(ADD_ENTRYPOINT_OBJ_ALIAS)
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# Alias targets help one add aliases to other entrypoint object targets.
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# One can use alias targets setup OS/machine independent entrypoint targets.
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list(LENGTH ADD_ENTRYPOINT_OBJ_DEPENDS deps_size)
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if(NOT (${deps_size} EQUAL "1"))
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message(FATAL_ERROR "An entrypoint alias should have exactly one dependency.")
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endif()
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list(GET ADD_ENTRYPOINT_OBJ_DEPENDS 0 dep_target)
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get_fq_dep_name(fq_dep_name ${dep_target})
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if(NOT TARGET ${fq_dep_name})
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message(WARNING "Aliasee ${fq_dep_name} for entrypoint alias ${target_name} missing; "
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"Target ${target_name} will be ignored.")
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return()
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endif()
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get_target_property(obj_type ${fq_dep_name} "TARGET_TYPE")
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if((NOT obj_type) OR (NOT (${obj_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE})))
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message(FATAL_ERROR "The aliasee of an entrypoint alias should be an entrypoint.")
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endif()
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add_custom_target(${fq_target_name})
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add_dependencies(${fq_target_name} ${fq_dep_name})
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get_target_property(object_file ${fq_dep_name} "OBJECT_FILE")
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get_target_property(object_file_raw ${fq_dep_name} "OBJECT_FILE_RAW")
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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"ENTRYPOINT_NAME" ${entrypoint_name}
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"TARGET_TYPE" ${ENTRYPOINT_OBJ_TARGET_TYPE}
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"IS_ALIAS" "YES"
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"OBJECT_FILE" ""
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"OBJECT_FILE_RAW" ""
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"DEPS" "${fq_dep_name}"
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)
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return()
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endif()
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if(NOT ADD_ENTRYPOINT_OBJ_SRCS)
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message(FATAL_ERROR "`add_entrypoint_object` rule requires SRCS to be specified.")
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endif()
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if(NOT ADD_ENTRYPOINT_OBJ_HDRS)
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message(FATAL_ERROR "`add_entrypoint_object` rule requires HDRS to be specified.")
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endif()
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_get_common_compile_options(common_compile_options ${ADD_ENTRYPOINT_OBJ_COMPILE_OPTIONS})
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set(internal_target_name ${fq_target_name}.__internal__)
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set(include_dirs ${LIBC_BUILD_DIR}/include ${LIBC_SOURCE_DIR} ${LIBC_BUILD_DIR})
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get_fq_deps_list(fq_deps_list ${ADD_ENTRYPOINT_OBJ_DEPENDS})
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set(full_deps_list ${fq_deps_list} libc.src.__support.common)
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add_library(
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${internal_target_name}
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# TODO: We don't need an object library for internal consumption.
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# A future change should switch this to a normal static library.
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EXCLUDE_FROM_ALL
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OBJECT
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${ADD_ENTRYPOINT_OBJ_SRCS}
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${ADD_ENTRYPOINT_OBJ_HDRS}
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)
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target_compile_options(${internal_target_name} BEFORE PRIVATE ${common_compile_options})
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target_include_directories(${internal_target_name} PRIVATE ${include_dirs})
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add_dependencies(${internal_target_name} ${full_deps_list})
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add_library(
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${fq_target_name}
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# We want an object library as the objects will eventually get packaged into
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# an archive (like libc.a).
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EXCLUDE_FROM_ALL
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OBJECT
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${ADD_ENTRYPOINT_OBJ_SRCS}
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${ADD_ENTRYPOINT_OBJ_HDRS}
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)
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target_compile_options(${fq_target_name} BEFORE PRIVATE ${common_compile_options} -DLLVM_LIBC_PUBLIC_PACKAGING)
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target_include_directories(${fq_target_name} PRIVATE ${include_dirs})
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add_dependencies(${fq_target_name} ${full_deps_list})
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if(ADD_ENTRYPOINT_OBJ_CXX_STANDARD)
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set_target_properties(
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${fq_target_name} ${internal_target_name}
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PROPERTIES
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CXX_STANDARD ${ADD_ENTRYPOINT_OBJ_CXX_STANDARD}
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)
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endif()
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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"ENTRYPOINT_NAME" ${entrypoint_name}
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"TARGET_TYPE" ${ENTRYPOINT_OBJ_TARGET_TYPE}
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"OBJECT_FILE" $<TARGET_OBJECTS:${fq_target_name}>
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# TODO: We don't need to list internal object files if the internal
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# target is a normal static library.
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"OBJECT_FILE_RAW" $<TARGET_OBJECTS:${internal_target_name}>
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"DEPS" "${fq_deps_list}"
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)
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if(LLVM_LIBC_ENABLE_LINTING)
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if(NOT LLVM_LIBC_CLANG_TIDY)
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message(FATAL_ERROR "Something is wrong! LLVM_LIBC_ENABLE_LINTING is "
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"ON but LLVM_LIBC_CLANG_TIDY is not set.")
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endif()
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# We only want a second invocation of clang-tidy to run
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# restrict-system-libc-headers if the compiler-resource-dir was set in
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# order to prevent false-positives due to a mismatch between the host
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# compiler and the compiled clang-tidy.
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if(COMPILER_RESOURCE_DIR)
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# We run restrict-system-libc-headers with --system-headers to prevent
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# transitive inclusion through compler provided headers.
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set(restrict_system_headers_check_invocation
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COMMAND ${LLVM_LIBC_CLANG_TIDY} --system-headers
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--checks="-*,llvmlibc-restrict-system-libc-headers"
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# We explicitly set the resource dir here to match the
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# resource dir of the host compiler.
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"--extra-arg=-resource-dir=${COMPILER_RESOURCE_DIR}"
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--quiet
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-p ${PROJECT_BINARY_DIR}
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${ADD_ENTRYPOINT_OBJ_SRCS}
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)
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else()
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set(restrict_system_headers_check_invocation
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COMMAND ${CMAKE_COMMAND} -E echo "Header file check skipped")
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endif()
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set(lint_timestamp "${CMAKE_CURRENT_BINARY_DIR}/.${target_name}.__lint_timestamp__")
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add_custom_command(
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OUTPUT ${lint_timestamp}
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# --quiet is used to surpress warning statistics from clang-tidy like:
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# Suppressed X warnings (X in non-user code).
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# There seems to be a bug in clang-tidy where by even with --quiet some
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# messages from clang's own diagnostics engine leak through:
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# X warnings generated.
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# Until this is fixed upstream, we use -fno-caret-diagnostics to surpress
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# these.
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COMMAND ${LLVM_LIBC_CLANG_TIDY}
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"--extra-arg=-fno-caret-diagnostics" --quiet
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# Path to directory containing compile_commands.json
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-p ${PROJECT_BINARY_DIR}
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${ADD_ENTRYPOINT_OBJ_SRCS}
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# See above: this might be a second invocation of clang-tidy depending on
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# the conditions above.
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${restrict_system_headers_check_invocation}
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# We have two options for running commands, add_custom_command and
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# add_custom_target. We don't want to run the linter unless source files
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# have changed. add_custom_target explicitly runs everytime therefore we
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# use add_custom_command. This function requires an output file and since
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# linting doesn't produce a file, we create a dummy file using a
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# crossplatform touch.
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COMMAND "${CMAKE_COMMAND}" -E touch ${lint_timestamp}
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COMMENT "Linting... ${target_name}"
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DEPENDS clang-tidy ${internal_target_name} ${ADD_ENTRYPOINT_OBJ_SRCS}
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WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
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)
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endif()
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endfunction(add_entrypoint_object)
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set(ENTRYPOINT_EXT_TARGET_TYPE "ENTRYPOINT_EXT")
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# A rule for external entrypoint targets.
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# Usage:
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# add_entrypoint_external(
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# <target_name>
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# DEPENDS <list of dependencies>
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# )
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function(add_entrypoint_external target_name)
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cmake_parse_arguments(
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"ADD_ENTRYPOINT_EXT"
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"" # No optional arguments
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"" # No single value arguments
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"DEPENDS" # Multi value arguments
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${ARGN}
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)
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get_fq_target_name(${target_name} fq_target_name)
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set(entrypoint_name ${target_name})
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add_custom_target(${fq_target_name})
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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"ENTRYPOINT_NAME" ${entrypoint_name}
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"TARGET_TYPE" ${ENTRYPOINT_EXT_TARGET_TYPE}
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"DEPS" "${ADD_ENTRYPOINT_EXT_DEPENDS}"
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)
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endfunction(add_entrypoint_external)
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# Rule build a redirector object file.
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function(add_redirector_object target_name)
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cmake_parse_arguments(
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"REDIRECTOR_OBJECT"
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"" # No optional arguments
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"SRC" # The cpp file in which the redirector is defined.
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"" # No multivalue arguments
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${ARGN}
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)
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if(NOT REDIRECTOR_OBJECT_SRC)
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message(FATAL_ERROR "'add_redirector_object' rule requires SRC option listing one source file.")
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endif()
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add_library(
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${target_name}
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EXCLUDE_FROM_ALL
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OBJECT
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${REDIRECTOR_OBJECT_SRC}
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)
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target_compile_options(
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${target_name}
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BEFORE PRIVATE -fPIC ${LIBC_COMPILE_OPTIONS_DEFAULT}
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)
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endfunction(add_redirector_object)
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