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## Copyright 2009-2020 Intel Corporation
## SPDX-License-Identifier: Apache-2.0
MACRO(_SET_IF_EMPTY VAR VALUE)
IF(NOT ${VAR})
SET(${VAR} "${VALUE}")
ENDIF()
ENDMACRO()
_SET_IF_EMPTY(FLAGS_SSE2 "-msse2")
_SET_IF_EMPTY(FLAGS_SSE42 "-msse4.2")
_SET_IF_EMPTY(FLAGS_AVX "-mavx")
_SET_IF_EMPTY(FLAGS_AVX2 "-mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2")
_SET_IF_EMPTY(FLAGS_AVX512KNL "-mavx512f -mavx512pf -mavx512er -mavx512cd -mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2")
_SET_IF_EMPTY(FLAGS_AVX512SKX "-mavx512f -mavx512dq -mavx512cd -mavx512bw -mavx512vl -mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2 -mprefer-vector-width=256")
OPTION(EMBREE_IGNORE_CMAKE_CXX_FLAGS "When enabled Embree ignores default CMAKE_CXX_FLAGS." ON)
IF (EMBREE_IGNORE_CMAKE_CXX_FLAGS)
SET(CMAKE_CXX_FLAGS "")
ENDIF()
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall") # enables most warnings
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wformat -Wformat-security") # enables string format vulnerability warnings
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-class-memaccess") # disables clearing an object of type ‘XXX’ with no trivial copy-assignment; use assignment or value-initialization instead
# these prevent compile to optimize away security checks
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-overflow") # assume that signed overflow occurs
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-delete-null-pointer-checks") # keep all checks for NULL pointers
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fwrapv") # this option instructs the compiler to assume that signed arithmetic overflow warps around.
IF (NOT APPLE)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIE") # enables support for more secure position independent execution
ENDIF()
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC") # generate position independent code suitable for shared libraries
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC") # generate position independent code suitable for shared libraries
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11") # enables C++11 features
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden") # makes all symbols hidden by default
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden") # makes all inline symbols hidden by default
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing") # disables strict aliasing rules
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-tree-vectorize") # disable auto vectorizer
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_FORTIFY_SOURCE=2") # perform extra security checks for some standard library calls
IF (EMBREE_STACK_PROTECTOR)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector") # protects against return address overrides
ENDIF()
MACRO(DISABLE_STACK_PROTECTOR_FOR_FILE file)
IF (EMBREE_STACK_PROTECTOR)
SET_SOURCE_FILES_PROPERTIES(${file} PROPERTIES COMPILE_FLAGS "-fno-stack-protector")
ENDIF()
ENDMACRO()
SET(CMAKE_CXX_FLAGS_DEBUG "")
SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g") # generate debug information
SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DDEBUG") # enable assertions
SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DTBB_USE_DEBUG") # configure TBB in debug mode
SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O3") # enable full optimizations
SET(CMAKE_CXX_FLAGS_RELEASE "")
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DNDEBUG") # disable assertions
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3") # enable full optimizations
SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "")
SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g") # generate debug information
SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -DNDEBUG") # disable assertions
SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3") # enable full optimizations
IF (APPLE)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mmacosx-version-min=10.7") # makes sure code runs on older MacOSX versions
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++") # link against libc++ which supports C++11 features
ELSE(APPLE)
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined") # issues link error for undefined symbols in shared library
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -z noexecstack") # we do not need an executable stack
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -z relro -z now") # re-arranges data sections to increase security
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -z noexecstack") # we do not need an executable stack
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -z relro -z now") # re-arranges data sections to increase security
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pie") # enables position independent execution for executable
ENDIF(APPLE)
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