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CMake Build: Tidy up when -msse2 is passed to gcc (#622)

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* Define CMAKE_ARM_COMPILER automatically (#469)

Makes use of CMAKE_SYSTEM_PROCESSOR to detect whether compilation is happening for an ARM architecture.

* Use the correct guard for specifying msse2 compiler flags.

Bruteforce and conversions were only checking against ANDROID which was not sufficient for ARM Linux builds.

* Remove redundant uses of the msse2 compiler flag.

* Globally set -msse2 for x86/amd64 gcc, Apple and Clang builds.

This is a change in behaviour. Prior to this commit, msse2 was only set for bruteforce and conversions.

msse and mfpmath=sse were already set globally prior to this change.
This commit is contained in:
Jeremy Kemp
2020-02-25 08:56:54 +00:00
committed by GitHub
parent e3bad1f90e
commit 996c353c0e
9 changed files with 6 additions and 55 deletions
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13
CMakeLists.txt
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@@ -122,17 +122,16 @@ include(CheckFunctionExists)
include(CheckIncludeFiles)
if(CMAKE_COMPILER_IS_GNUCC OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-narrowing")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing")
# -msse -mfpmath=sse to force gcc to use sse for float math,
# avoiding excess precision problems that cause tests like int2float
# to falsely fail. -ffloat-store also works, but WG suggested
# that sse would be better.
if(CMAKE_ARM_COMPILER OR ANDROID)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-narrowing")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-narrowing")
else(CMAKE_ARM_COMPILER OR ANDROID)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse -mfpmath=sse -Wno-narrowing")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse -mfpmath=sse -Wno-narrowing")
endif(CMAKE_ARM_COMPILER OR ANDROID)
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*" OR CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse -msse2 -mfpmath=sse")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse -msse2 -mfpmath=sse")
endif()
else()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D__SSE__")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /D__SSE__")