231 lines
7.7 KiB
CMake
231 lines
7.7 KiB
CMake
###############################################################################
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if (__nc_optimisation)
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return()
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endif ()
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set (__nc_optimisation TRUE)
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###############################################################################
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include ("${CMAKE_CURRENT_LIST_DIR}/compile_flag.cmake")
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include ("${CMAKE_CURRENT_LIST_DIR}/link_flag.cmake")
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include ("${CMAKE_CURRENT_LIST_DIR}/canonical_host.cmake")
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###############################################################################
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option(LTO "enable link-time optimisation" OFF)
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##-----------------------------------------------------------------------------
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## Enable link-time optimisation.
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##
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## The INTERPROCEDURAL_OPTIMISATION flag is silently ignored for almost all
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## compilers. Fuck you too CMake. We have to make up for its deficiencies
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## ourselves.
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if (LTO)
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# Add the linker flags first otherwise the linker may not recognise the
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# object format
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append_link_flag("-fuse-linker-plugin")
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# HACK: we shouldn't use 'auto' as it will likely lead to oversubscription
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# but I'm sick of holding GCC's hand today.
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append_first_link_flag("-flto=auto" "-flto")
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# Enable LTO on the compilation side, but try very hard to avoid
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# situations where we may accidentally use regular/fat objects.
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#
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# GCC 12 will emit a warning about serial compilation of LTRANS jobs if an
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# explicit parameter is not passed. It must be an integer, auto, or
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# jobserver.
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# Clang will only accept 'full', 'thin', or no argument.
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#
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# HACK: we shouldn't use 'auto' as it will likely lead to oversubscription
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# but I'm sick of holding GCC's hand today.
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append_first_compile_flag("-flto=auto" "-flto")
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append_compile_flag("-fno-fat-lto-objects")
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append_compile_flag("-flto-jobs=0")
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# Try to squeeze out some more diagnostics via LTO
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append_compile_flag("-flto-odr-type-merging")
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# GCC: Attempt to use a more aggressive whole-program style of LTO
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# NOTE: It's unclear if this _actually_ buys us performance or if it just
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# slows down linking (by a substantial factor).
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#append_compile_flag("-flto-partition=none")
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# Throw in some optimisation flags that are LTO specific. We don't
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# particularly care about checking Debug/Release here because LTO is
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# pretty heavyweight anyway.
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append_compile_flag("-fdevirtualize-at-ltrans")
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# If we're using GCC we probably need to use gcc-{ar,nm,ranlib} so that
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# plugin support works. Ideally we'd actually do some compilation tests,
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# but... it's a royal PITA with CMake.
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
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set (CMAKE_AR "gcc-ar")
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set (CMAKE_NM "gcc-nm")
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set (CMAKE_RANLIB "gcc-ranlib")
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endif ()
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endif ()
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###############################################################################
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option(FRAMEPOINTER "retain the framepointer even if optimising" OFF)
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##-----------------------------------------------------------------------------
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if (FRAMEPOINTER)
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append_compile_flag("-fno-omit-frame-pointer")
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endif ()
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###############################################################################
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canonical_host()
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##-----------------------------------------------------------------------------
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if (${host_cpu} STREQUAL "x86_64")
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# Explicitly qualify the CPU as the minimum viable architecture, but tune
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# for common platforms. This might prevent some invalid instructions being
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# emitted.
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append_compile_flag(-march=x86-64)
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append_compile_flag(-mtune=generic)
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append_compile_flag(-msse)
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append_compile_flag(-msse2)
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append_compile_flag(-mssse3)
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append_compile_flag(-msse3)
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append_compile_flag(-mavx)
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append_compile_flag(-mno-avx2)
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# These instructions should always be available on reasonable platforms.
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# They're almost 20 years old at this point.
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#append_compile_flag(-msse)
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#append_compile_flag(-msse2)
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# append_compile_flag(-mssse3)
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# append_compile_flag(-msahf)
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elseif (${host_cpu} STREQUAL "i686")
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append_compile_flag(-march=prescott)
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append_compile_flag(-mtune=generic)
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append_compile_flag(-mcmov)
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append_compile_flag(-mfpmath=sse)
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else ()
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message (WARNING "Unknown architecture. Not attempting performance options")
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endif ()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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else()
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# unsafe maths
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# append_compile_flag(-funsafe-math-optimizations)
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# append_compile_flag(-ffast-math)
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# append_compile_flag(-fno-finite-math-only)
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# vectorisation
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append_compile_flag(-ftree-vectorize)
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append_compile_flag(-fvectorize)
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append_compile_flag(-fslp-vectorize)
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# loop hosting/distribution
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append_compile_flag(-floop-nest-optimize)
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append_compile_flag(-ftree-loop-distribution)
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append_compile_flag(-ftree-loop-distribute-patterns)
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append_compile_flag(-ftree-loop-im)
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append_compile_flag(-ftree-loop-if-convert-stores)
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append_compile_flag(-fivopts)
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append_compile_flag(-funsafe-loop-optimizations)
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append_compile_flag(-floop-interchange)
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append_compile_flag(-fpredictive-commoning)
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append_compile_flag(-funswitch-loops)
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# GCC 8.2 encounters an ICE in LTO linking with ipa-pta enabled
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append_compile_flag (-fipa-pta)
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# safety removal for performance
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append_compile_flag(-fno-stack-protector)
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endif()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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else ()
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append_compile_flag(-fdevirtualize)
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append_compile_flag(-fdevirtualize-speculatively)
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check_link_flag(TEST_GC_SECTIONS, "-Wl,--gc-sections")
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if (TEST_LD_GC_SECTIONS)
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append_compile_flag(-fdata-sections)
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append_compile_flag(-ffunction-sections)
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append_link_flag("-Wl,--gc-sections")
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endif ()
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endif ()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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set (_DEFAULT_RUNTIME_DEBUGGING ON)
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else()
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set (_DEFAULT_RUNTIME_DEBUGGING OFF)
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endif()
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#message(FATAL_ERROR "RUNTIME DEBUGGING ${_DEFAULT_RUNTIME_DEBUGGING}")
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option(
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RUNTIME_DEBUGGING
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"enable debugging features that impact runtime and ABI"
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${_DEFAULT_RUNTIME_DEBUGGING}
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)
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if (RUNTIME_DEBUGGING)
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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else()
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message(FATAL_ERROR "RUNTIME_DEBUGGING is only supported under a DEBUG build")
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endif()
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endif ()
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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add_definitions(-DENABLE_DEBUGGING)
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if (RUNTIME_DEBUGGING)
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if ("${STDLIB}" STREQUAL "libstdc++")
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add_definitions(-D_GLIBCXX_DEBUG)
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endif()
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endif()
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# Don't make any commits that use -O0 by default. Instead, either add an
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# argument that allows one to choose, or temporarily switch the lines
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# below locally. -O0 is just too slow for computationally heavy projects.
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#append_compile_flag(-Og)
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append_compile_flag(-O0)
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append_compile_flag(-Werror)
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# stack protection tends to cause segfaults in the generated binary
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# occuring in the standard library under msys2 and related compilers.
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#
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# it's easily shown by simply creating a local std::string. rather than
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# get to the root cause we just disable the protection under windows.
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if (NOT WIN32)
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append_compile_flag(-fstack-protector)
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endif()
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else ()
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append_compile_flag(-O2)
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append_compile_flag(-fno-rtti)
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add_definitions(-DNO_RTTI)
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add_definitions(-DNDEBUG)
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endif ()
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###############################################################################
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append_compile_flag(-g)
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# gcc#: -ggdb tends to trigger an ICE in 'trunc_int_for_mode' under GCC with
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# libcruft-util's coord code. It's not strictly necessary so disable it for
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# now.
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#append_compile_flag(-ggdb)
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