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0033399: Configuration - Research into opportunities to increase performance

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Implement CMake profiles to modify compiler and linker flags
This commit is contained in:
dpasukhi 2023-11-30 10:29:11 +00:00
parent a6e425d0a6
commit 7036facf10
2 changed files with 39 additions and 3 deletions
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4
CMakeLists.txt
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@ -39,6 +39,10 @@ endmacro()
set (USE_MMGR_TYPE "NATIVE" CACHE STRING "Select using memory manager tool.")
set_property(CACHE USE_MMGR_TYPE PROPERTY STRINGS "NATIVE" "FLEXIBLE" "TBB" "JEMALLOC")
# set profile for C++ compiler and linker
set (BUILD_OPT_PROFILE "Default" CACHE STRING "Select profile for compiler and linker.")
set_property(CACHE BUILD_OPT_PROFILE PROPERTY STRINGS "Default" "Production")
# include variable description
OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/vardescr")

38
adm/cmake/occt_defs_flags.cmake
View File

@ -44,9 +44,25 @@ elseif (MSVC)
endif()
if (MSVC)
# string pooling (GF), function-level linking (Gy)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GF /Gy")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /GF /Gy")
if ("${BUILD_OPT_PROFILE}" STREQUAL "Production")
# string pooling (GF), function-level linking (Gy)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GF /Gy")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /GF /Gy")
# Favor fast code (Ot), Omit frame pointers (Oy)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Ot /Oy")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Ot /Oy")
# Whole Program Optimisation (GL), Enable intrinsic functions (Oi)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL /Oi")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /GL /Oi")
# Link-Time Code Generation(LTCG) is requared for Whole Program Optimisation(GL)
set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
set(CMAKE_MODULE_LINKER_FLAGS_RELEASE "${CMAKE_MODULE_LINKER_FLAGS_RELEASE} /LTCG")
endif()
if (BUILD_FORCE_RelWithDebInfo)
# generate debug info (Zi), inline expansion level (Ob1)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi /Ob1")
@ -118,6 +134,22 @@ if (MSVC)
endif()
elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]"))
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
if ("${BUILD_OPT_PROFILE}" STREQUAL "Production")
# /Ot (favor speed over size) is similar to -O2 or -O3 in GCC/Clang.
# /Oy (omit frame pointers) is similar to -fomit-frame-pointer in GCC/Clang.
# /GL (whole program optimization) is similar to -flto (Link Time Optimization) in GCC/Clang.
# /GF (eliminate duplicate strings) doesn't have a direct equivalent in GCC/Clang, but the compilers do string pooling automatically.
# /Gy (enable function-level linking) is similar to -ffunction-sections in GCC/Clang.
# /fp:precise (improve floating-point consistency) is similar to -ffloat-store in GCC, but there isn't a perfect equivalent in Clang.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -fomit-frame-pointer -flto -ffunction-sections -ffloat-store")
# Link-Time Code Generation(LTCG) is requared for Whole Program Optimisation(GL)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -flto")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -flto")
set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} -flto")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -flto")
endif()
if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wshorten-64-to-32")
endif()