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Fix clobbering of default CMAKE_CXX_FLAGS_RELEASE
BENCHMARK_ENABLE_LTO=true was completely replacing CMAKE_CXX_FLAGS_RELEASE; meaning neither CMake's release defaults nor user customizations were being applied.
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@ -39,10 +39,10 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
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# Link time optimisation
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if (BENCHMARK_ENABLE_LTO)
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set(CMAKE_CXX_FLAGS_RELEASE "/GL")
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set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "/LTCG")
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set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "/LTCG")
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set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/LTCG")
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set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL")
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set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
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set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
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set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
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endif()
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else()
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# Try and enable C++11. Don't use C++14 because it doesn't work in some
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