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CMake: Use improved optimization flags on MSVC

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While not having a noticeable effect on CPU-bound applications, this
change gives an about 30-50% increase in performance for games using
the GPU.
This commit is contained in:
Yuri Kunde Schlesner 2014-12-21 05:18:12 -02:00
parent c107249103
commit ed8f32f03e
1 changed files with 19 additions and 0 deletions
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19
CMakeLists.txt
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@ -11,6 +11,25 @@ else()
add_definitions(/D_CRT_SECURE_NO_WARNINGS)
# set up output paths for executable binaries (.exe-files, and .dll-files on DLL-capable platforms)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
# Tweak optimization settings
# As far as I can tell, there's no way to override the CMake defaults while leaving user
# changes intact, so we'll just clobber everything and say sorry.
message(STATUS "Cache compiler flags ignored, please edit CMakeFiles.txt to change the flags.")
# /MD - Multi-threaded runtime
# /Ox - Full optimization
# /Oi - Use intrinsic functions
# /Oy- - Don't omit frame pointer
# /GR- - Disable RTTI
# /GS- - No stack buffer overflow checks
# /EHsc - C++-only exception handling semantics
set(optimization_flags "/MD /Ox /Oi /Oy- /DNDEBUG /GR- /GS- /EHsc")
# /Zi - Output debugging information
# /Zo - enahnced debug info for optimized builds
set(CMAKE_C_FLAGS_RELEASE "${optimization_flags} /Zi" CACHE STRING "" FORCE)
set(CMAKE_CXX_FLAGS_RELEASE "${optimization_flags} /Zi" CACHE STRING "" FORCE)
set(CMAKE_C_FLAGS_RELWITHDEBINFO "${optimization_flags} /Zi /Zo" CACHE STRING "" FORCE)
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${optimization_flags} /Zi /Zo" CACHE STRING "" FORCE)
endif()
add_definitions(-DSINGLETHREADED)