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function(_get_compile_options_from_flags output_var)
set(compile_options "")
if(LIBC_TARGET_ARCHITECTURE_IS_RISCV64 OR(LIBC_CPU_FEATURES MATCHES "FMA"))
check_flag(ADD_FMA_FLAG ${FMA_OPT_FLAG} ${ARGN})
endif()
check_flag(ADD_ROUND_OPT_FLAG ${ROUND_OPT_FLAG} ${ARGN})
check_flag(ADD_EXPLICIT_SIMD_OPT_FLAG ${EXPLICIT_SIMD_OPT_FLAG} ${ARGN})
check_flag(ADD_MISC_MATH_BASIC_OPS_OPT_FLAG ${MISC_MATH_BASIC_OPS_OPT_FLAG} ${ARGN})
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
if(ADD_FMA_FLAG)
if(LIBC_TARGET_ARCHITECTURE_IS_X86)
list(APPEND compile_options "-mavx2")
list(APPEND compile_options "-mfma")
elseif(LIBC_TARGET_ARCHITECTURE_IS_RISCV64)
list(APPEND compile_options "-D__LIBC_RISCV_USE_FMA")
endif()
endif()
if(ADD_ROUND_OPT_FLAG)
if(LIBC_TARGET_ARCHITECTURE_IS_X86)
# ROUND_OPT_FLAG is only enabled if SSE4.2 is detected, not just SSE4.1,
# because there was code to check for SSE4.2 already, and few CPUs only
# have SSE4.1.
list(APPEND compile_options "-msse4.2")
endif()
if(LIBC_COMPILER_HAS_BUILTIN_CEIL_FLOOR_RINT_TRUNC)
list(APPEND compile_options
"-D__LIBC_USE_BUILTIN_CEIL_FLOOR_RINT_TRUNC")
endif()
if(LIBC_COMPILER_HAS_BUILTIN_ROUND)
list(APPEND compile_options "-D__LIBC_USE_BUILTIN_ROUND")
endif()
if(LIBC_COMPILER_HAS_BUILTIN_ROUNDEVEN)
list(APPEND compile_options "-D__LIBC_USE_BUILTIN_ROUNDEVEN")
endif()
endif()
if(ADD_EXPLICIT_SIMD_OPT_FLAG)
list(APPEND compile_options "-D__LIBC_EXPLICIT_SIMD_OPT")
endif()
if(ADD_MISC_MATH_BASIC_OPS_OPT_FLAG)
list(APPEND compile_options "-D__LIBC_MISC_MATH_BASIC_OPS_OPT")
endif()
elseif(MSVC)
if(ADD_FMA_FLAG)
list(APPEND compile_options "/arch:AVX2")
endif()
if(ADD_EXPLICIT_SIMD_OPT_FLAG)
list(APPEND compile_options "/D__LIBC_EXPLICIT_SIMD_OPT")
endif()
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction(_get_compile_options_from_flags)
function(_get_compile_options_from_config output_var)
set(config_options "")
if(LIBC_CONF_QSORT_IMPL)
list(APPEND config_options "-DLIBC_QSORT_IMPL=${LIBC_CONF_QSORT_IMPL}")
endif()
set(${output_var} ${config_options} PARENT_SCOPE)
endfunction(_get_compile_options_from_config)
function(_get_common_compile_options output_var flags)
_get_compile_options_from_flags(compile_flags ${flags})
_get_compile_options_from_config(config_flags)
set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags} ${config_flags})
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
list(APPEND compile_options "-fpie")
if(LLVM_LIBC_FULL_BUILD)
# Only add -ffreestanding flag in non-GPU full build mode.
if(NOT LIBC_TARGET_OS_IS_GPU)
list(APPEND compile_options "-ffreestanding")
endif()
list(APPEND compile_options "-DLIBC_FULL_BUILD")
# Manually disable standard include paths to prevent system headers from
# being included.
if(LIBC_CC_SUPPORTS_NOSTDLIBINC)
list(APPEND compile_options "-nostdlibinc")
elseif(COMPILER_RESOURCE_DIR)
# TODO: We should require COMPILER_RESOURCE_DIR to be set.
list(APPEND compile_options "-isystem${COMPILER_RESOURCE_DIR}/include")
list(APPEND compile_options "-nostdinc")
endif()
# TODO: We should set this unconditionally on Linux.
if(LIBC_TARGET_OS_IS_LINUX AND
(LIBC_CC_SUPPORTS_NOSTDLIBINC OR COMPILER_RESOURCE_DIR))
# We use -idirafter to avoid preempting libc's own headers in case the
# directory (e.g. /usr/include) contains other headers.
if(CMAKE_CROSSCOMPILING)
list(APPEND compile_options "-idirafter=${LIBC_KERNEL_HEADERS}")
else()
list(APPEND compile_options "-idirafter${LIBC_KERNEL_HEADERS}")
endif()
endif()
endif()
if(LIBC_COMPILER_HAS_FIXED_POINT)
list(APPEND compile_options "-ffixed-point")
endif()
if(NOT LIBC_TARGET_OS_IS_GPU)
list(APPEND compile_options "-fno-builtin")
endif()
list(APPEND compile_options "-fno-exceptions")
list(APPEND compile_options "-fno-lax-vector-conversions")
list(APPEND compile_options "-fno-unwind-tables")
list(APPEND compile_options "-fno-asynchronous-unwind-tables")
list(APPEND compile_options "-fno-rtti")
if (LIBC_CC_SUPPORTS_PATTERN_INIT)
list(APPEND compile_options "-ftrivial-auto-var-init=pattern")
endif()
if (LIBC_CONF_KEEP_FRAME_POINTER)
list(APPEND compile_options "-fno-omit-frame-pointer")
if (LIBC_TARGET_ARCHITECTURE_IS_X86)
list(APPEND compile_options "-mno-omit-leaf-frame-pointer")
endif()
endif()
if (LIBC_CONF_ENABLE_STACK_PROTECTOR)
list(APPEND compile_options "-fstack-protector-strong")
endif()
list(APPEND compile_options "-Wall")
list(APPEND compile_options "-Wextra")
# -DLIBC_WNO_ERROR=ON if you can't build cleanly with -Werror.
if(NOT LIBC_WNO_ERROR)
list(APPEND compile_options "-Werror")
endif()
list(APPEND compile_options "-Wconversion")
list(APPEND compile_options "-Wno-sign-conversion")
list(APPEND compile_options "-Wimplicit-fallthrough")
list(APPEND compile_options "-Wwrite-strings")
list(APPEND compile_options "-Wextra-semi")
if(NOT CMAKE_COMPILER_IS_GNUCXX)
list(APPEND compile_options "-Wnewline-eof")
list(APPEND compile_options "-Wnonportable-system-include-path")
list(APPEND compile_options "-Wstrict-prototypes")
list(APPEND compile_options "-Wthread-safety")
list(APPEND compile_options "-Wglobal-constructors")
endif()
if(LIBC_CONF_MATH_OPTIMIZATIONS)
list(APPEND compile_options "-DLIBC_MATH=${LIBC_CONF_MATH_OPTIMIZATIONS}")
endif()
elseif(MSVC)
list(APPEND compile_options "/EHs-c-")
list(APPEND compile_options "/GR-")
endif()
if (LIBC_TARGET_OS_IS_GPU)
list(APPEND compile_options "-nogpulib")
list(APPEND compile_options "-fvisibility=hidden")
list(APPEND compile_options "-fconvergent-functions")
list(APPEND compile_options "-flto")
list(APPEND compile_options "-Wno-multi-gpu")
if(LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
list(APPEND compile_options "-Wno-unknown-cuda-version")
list(APPEND compile_options "--cuda-feature=+ptx63")
if(LIBC_CUDA_ROOT)
list(APPEND compile_options "--cuda-path=${LIBC_CUDA_ROOT}")
endif()
elseif(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU)
list(APPEND compile_options "SHELL:-Xclang -mcode-object-version=none")
endif()
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction()
function(_get_common_test_compile_options output_var c_test flags)
_get_compile_options_from_flags(compile_flags ${flags})
set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags})
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
list(APPEND compile_options "-fpie")
if(LLVM_LIBC_FULL_BUILD)
list(APPEND compile_options "-DLIBC_FULL_BUILD")
# Only add -ffreestanding flag in full build mode.
list(APPEND compile_options "-ffreestanding")
list(APPEND compile_options "-fno-exceptions")
list(APPEND compile_options "-fno-unwind-tables")
list(APPEND compile_options "-fno-asynchronous-unwind-tables")
if(NOT ${c_test})
list(APPEND compile_options "-fno-rtti")
endif()
endif()
if(LIBC_COMPILER_HAS_FIXED_POINT)
list(APPEND compile_options "-ffixed-point")
endif()
# list(APPEND compile_options "-Wall")
# list(APPEND compile_options "-Wextra")
# -DLIBC_WNO_ERROR=ON if you can't build cleanly with -Werror.
if(NOT LIBC_WNO_ERROR)
# list(APPEND compile_options "-Werror")
endif()
# list(APPEND compile_options "-Wconversion")
# list(APPEND compile_options "-Wno-sign-conversion")
# list(APPEND compile_options "-Wimplicit-fallthrough")
# list(APPEND compile_options "-Wwrite-strings")
# list(APPEND compile_options "-Wextra-semi")
# if(NOT CMAKE_COMPILER_IS_GNUCXX)
# list(APPEND compile_options "-Wnewline-eof")
# list(APPEND compile_options "-Wnonportable-system-include-path")
# list(APPEND compile_options "-Wstrict-prototypes")
# list(APPEND compile_options "-Wthread-safety")
# list(APPEND compile_options "-Wglobal-constructors")
# endif()
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction()
function(_get_hermetic_test_compile_options output_var flags)
_get_compile_options_from_flags(compile_flags ${flags})
list(APPEND compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags}
${flags} -fpie -ffreestanding -fno-exceptions -fno-rtti)
# The GPU build requires overriding the default CMake triple and architecture.
if(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU)
list(APPEND compile_options
-Wno-multi-gpu -nogpulib -mcpu=${LIBC_GPU_TARGET_ARCHITECTURE} -flto
-mcode-object-version=${LIBC_GPU_CODE_OBJECT_VERSION})
elseif(LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
list(APPEND compile_options
"SHELL:-mllvm -nvptx-emit-init-fini-kernel=false"
-Wno-multi-gpu --cuda-path=${LIBC_CUDA_ROOT}
-nogpulib -march=${LIBC_GPU_TARGET_ARCHITECTURE} -fno-use-cxa-atexit)
endif()
if(LLVM_LIBC_FULL_BUILD)
list(APPEND compile_options "-DLIBC_FULL_BUILD")
endif()
set(${output_var} ${compile_options} PARENT_SCOPE)
endfunction()
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