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0f55045526
This patch pulls google/benchmark v1.4.1 into the LLVM tree so that any project could use it for benchmark generation. A dummy benchmark is added to `llvm/benchmarks/DummyYAML.cpp` to validate the correctness of the build process. The current version does not utilize LLVM LNT and LLVM CMake infrastructure, but that might be sufficient for most users. Two introduced CMake variables: * `LLVM_INCLUDE_BENCHMARKS` (`ON` by default) generates benchmark targets * `LLVM_BUILD_BENCHMARKS` (`OFF` by default) adds generated benchmark targets to the list of default LLVM targets (i.e. if `ON` benchmarks will be built upon standard build invocation, e.g. `ninja` or `make` with no specific targets) List of modifications: * `BENCHMARK_ENABLE_TESTING` is disabled * `BENCHMARK_ENABLE_EXCEPTIONS` is disabled * `BENCHMARK_ENABLE_INSTALL` is disabled * `BENCHMARK_ENABLE_GTEST_TESTS` is disabled * `BENCHMARK_DOWNLOAD_DEPENDENCIES` is disabled Original discussion can be found here: http://lists.llvm.org/pipermail/llvm-dev/2018-August/125023.html Reviewed by: dberris, lebedev.ri Subscribers: ilya-biryukov, ioeric, EricWF, lebedev.ri, srhines, dschuff, mgorny, krytarowski, fedor.sergeev, mgrang, jfb, llvm-commits Differential Revision: https://reviews.llvm.org/D50894 llvm-svn: 340809
75 lines
2.8 KiB
CMake
75 lines
2.8 KiB
CMake
# - Adds a compiler flag if it is supported by the compiler
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#
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# This function checks that the supplied compiler flag is supported and then
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# adds it to the corresponding compiler flags
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#
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# add_cxx_compiler_flag(<FLAG> [<VARIANT>])
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#
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# - Example
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#
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# include(AddCXXCompilerFlag)
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# add_cxx_compiler_flag(-Wall)
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# add_cxx_compiler_flag(-no-strict-aliasing RELEASE)
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# Requires CMake 2.6+
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if(__add_cxx_compiler_flag)
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return()
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endif()
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set(__add_cxx_compiler_flag INCLUDED)
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include(CheckCXXCompilerFlag)
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function(mangle_compiler_flag FLAG OUTPUT)
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string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
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string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
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string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
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string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
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set(${OUTPUT} "${SANITIZED_FLAG}" PARENT_SCOPE)
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endfunction(mangle_compiler_flag)
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function(add_cxx_compiler_flag FLAG)
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mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
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set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
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check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
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set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
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if(${MANGLED_FLAG})
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set(VARIANT ${ARGV1})
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if(ARGV1)
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string(TOUPPER "_${VARIANT}" VARIANT)
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endif()
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set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${BENCHMARK_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
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endif()
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endfunction()
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function(add_required_cxx_compiler_flag FLAG)
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mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
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set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
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check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
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set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
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if(${MANGLED_FLAG})
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set(VARIANT ${ARGV1})
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if(ARGV1)
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string(TOUPPER "_${VARIANT}" VARIANT)
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endif()
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set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}" PARENT_SCOPE)
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else()
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message(FATAL_ERROR "Required flag '${FLAG}' is not supported by the compiler")
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endif()
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endfunction()
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function(check_cxx_warning_flag FLAG)
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mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
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set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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# Add -Werror to ensure the compiler generates an error if the warning flag
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# doesn't exist.
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror ${FLAG}")
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check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
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set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
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endfunction()
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