1896ee3889
Currently the nan* functions use nullptr dereferencing to crash with SIGSEGV if the input is nullptr. Both `nan(nullptr)` and `nullptr` dereferencing are undefined behaviors according to the C standard. Employing `nullptr` dereference in the `nan` function implementation is ok if users only linked against the pre-built library, but it might be completely removed by the compilers' optimizations if it is built from source together with the users' code. See for instance: https://godbolt.org/z/fd8KcM9bx This PR uses volatile load to prevent the undefined behavior if libc is built without sanitizers, and leave the current undefined behavior if libc is built with sanitizers, so that the undefined behavior can be caught for users' codes.
263 lines
10 KiB
CMake
263 lines
10 KiB
CMake
function(_get_compile_options_from_flags output_var)
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set(compile_options "")
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if(LIBC_TARGET_ARCHITECTURE_IS_RISCV64 OR(LIBC_CPU_FEATURES MATCHES "FMA"))
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check_flag(ADD_FMA_FLAG ${FMA_OPT_FLAG} ${ARGN})
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endif()
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check_flag(ADD_ROUND_OPT_FLAG ${ROUND_OPT_FLAG} ${ARGN})
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check_flag(ADD_EXPLICIT_SIMD_OPT_FLAG ${EXPLICIT_SIMD_OPT_FLAG} ${ARGN})
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check_flag(ADD_MISC_MATH_BASIC_OPS_OPT_FLAG ${MISC_MATH_BASIC_OPS_OPT_FLAG} ${ARGN})
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if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
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if(ADD_FMA_FLAG)
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if(LIBC_TARGET_ARCHITECTURE_IS_X86)
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list(APPEND compile_options "-mavx2")
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list(APPEND compile_options "-mfma")
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elseif(LIBC_TARGET_ARCHITECTURE_IS_RISCV64)
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list(APPEND compile_options "-D__LIBC_RISCV_USE_FMA")
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endif()
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endif()
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if(ADD_ROUND_OPT_FLAG)
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if(LIBC_TARGET_ARCHITECTURE_IS_X86)
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# ROUND_OPT_FLAG is only enabled if SSE4.2 is detected, not just SSE4.1,
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# because there was code to check for SSE4.2 already, and few CPUs only
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# have SSE4.1.
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list(APPEND compile_options "-msse4.2")
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endif()
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if(LIBC_COMPILER_HAS_BUILTIN_CEIL_FLOOR_RINT_TRUNC)
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list(APPEND compile_options
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"-D__LIBC_USE_BUILTIN_CEIL_FLOOR_RINT_TRUNC")
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endif()
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if(LIBC_COMPILER_HAS_BUILTIN_ROUND)
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list(APPEND compile_options "-D__LIBC_USE_BUILTIN_ROUND")
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endif()
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if(LIBC_COMPILER_HAS_BUILTIN_ROUNDEVEN)
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list(APPEND compile_options "-D__LIBC_USE_BUILTIN_ROUNDEVEN")
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endif()
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endif()
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if(ADD_EXPLICIT_SIMD_OPT_FLAG)
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list(APPEND compile_options "-D__LIBC_EXPLICIT_SIMD_OPT")
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endif()
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if(ADD_MISC_MATH_BASIC_OPS_OPT_FLAG)
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list(APPEND compile_options "-D__LIBC_MISC_MATH_BASIC_OPS_OPT")
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if(LIBC_COMPILER_HAS_BUILTIN_FMAX_FMIN)
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list(APPEND compile_options "-D__LIBC_USE_BUILTIN_FMAX_FMIN")
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endif()
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if(LIBC_COMPILER_HAS_BUILTIN_FMAXF16_FMINF16)
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list(APPEND compile_options "-D__LIBC_USE_BUILTIN_FMAXF16_FMINF16")
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endif()
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if("FullFP16" IN_LIST LIBC_CPU_FEATURES AND
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CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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list(APPEND compile_options
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"SHELL:-Xclang -target-feature -Xclang +fullfp16")
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endif()
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endif()
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elseif(MSVC)
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if(ADD_FMA_FLAG)
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list(APPEND compile_options "/arch:AVX2")
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endif()
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if(ADD_EXPLICIT_SIMD_OPT_FLAG)
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list(APPEND compile_options "/D__LIBC_EXPLICIT_SIMD_OPT")
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endif()
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endif()
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set(${output_var} ${compile_options} PARENT_SCOPE)
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endfunction(_get_compile_options_from_flags)
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function(_get_compile_options_from_config output_var)
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set(config_options "")
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if(LIBC_CONF_QSORT_IMPL)
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list(APPEND config_options "-DLIBC_QSORT_IMPL=${LIBC_CONF_QSORT_IMPL}")
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endif()
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if(LIBC_TYPES_TIME_T_IS_32_BIT AND LLVM_LIBC_FULL_BUILD)
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list(APPEND config_options "-DLIBC_TYPES_TIME_T_IS_32_BIT")
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endif()
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if(LIBC_ADD_NULL_CHECKS)
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list(APPEND config_options "-DLIBC_ADD_NULL_CHECKS")
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endif()
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set(${output_var} ${config_options} PARENT_SCOPE)
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endfunction(_get_compile_options_from_config)
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function(_get_common_compile_options output_var flags)
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_get_compile_options_from_flags(compile_flags ${flags})
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_get_compile_options_from_config(config_flags)
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set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags} ${config_flags})
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if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
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list(APPEND compile_options "-fpie")
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if(LLVM_LIBC_FULL_BUILD)
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# Only add -ffreestanding flag in non-GPU full build mode.
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if(NOT LIBC_TARGET_OS_IS_GPU)
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list(APPEND compile_options "-ffreestanding")
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endif()
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list(APPEND compile_options "-DLIBC_FULL_BUILD")
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# Manually disable standard include paths to prevent system headers from
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# being included.
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if(LIBC_CC_SUPPORTS_NOSTDLIBINC)
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list(APPEND compile_options "-nostdlibinc")
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elseif(COMPILER_RESOURCE_DIR)
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# TODO: We should require COMPILER_RESOURCE_DIR to be set.
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list(APPEND compile_options "-isystem${COMPILER_RESOURCE_DIR}/include")
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list(APPEND compile_options "-nostdinc")
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endif()
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# TODO: We should set this unconditionally on Linux.
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if(LIBC_TARGET_OS_IS_LINUX AND
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(LIBC_CC_SUPPORTS_NOSTDLIBINC OR COMPILER_RESOURCE_DIR))
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# We use -idirafter to avoid preempting libc's own headers in case the
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# directory (e.g. /usr/include) contains other headers.
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if(CMAKE_CROSSCOMPILING)
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list(APPEND compile_options "-idirafter=${LIBC_KERNEL_HEADERS}")
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else()
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list(APPEND compile_options "-idirafter${LIBC_KERNEL_HEADERS}")
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endif()
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endif()
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endif()
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if(LIBC_COMPILER_HAS_FIXED_POINT)
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list(APPEND compile_options "-ffixed-point")
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endif()
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if(NOT LIBC_TARGET_OS_IS_GPU)
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list(APPEND compile_options "-fno-builtin")
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endif()
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list(APPEND compile_options "-fno-exceptions")
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list(APPEND compile_options "-fno-lax-vector-conversions")
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list(APPEND compile_options "-fno-unwind-tables")
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list(APPEND compile_options "-fno-asynchronous-unwind-tables")
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list(APPEND compile_options "-fno-rtti")
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if (LIBC_CC_SUPPORTS_PATTERN_INIT)
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list(APPEND compile_options "-ftrivial-auto-var-init=pattern")
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endif()
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if (LIBC_CONF_KEEP_FRAME_POINTER)
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list(APPEND compile_options "-fno-omit-frame-pointer")
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if (LIBC_TARGET_ARCHITECTURE_IS_X86)
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list(APPEND compile_options "-mno-omit-leaf-frame-pointer")
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endif()
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endif()
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if (LIBC_CONF_ENABLE_STACK_PROTECTOR)
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list(APPEND compile_options "-fstack-protector-strong")
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endif()
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list(APPEND compile_options "-Wall")
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list(APPEND compile_options "-Wextra")
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# -DLIBC_WNO_ERROR=ON if you can't build cleanly with -Werror.
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if(NOT LIBC_WNO_ERROR)
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list(APPEND compile_options "-Werror")
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endif()
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list(APPEND compile_options "-Wconversion")
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list(APPEND compile_options "-Wno-sign-conversion")
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list(APPEND compile_options "-Wimplicit-fallthrough")
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list(APPEND compile_options "-Wwrite-strings")
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list(APPEND compile_options "-Wextra-semi")
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if(NOT CMAKE_COMPILER_IS_GNUCXX)
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list(APPEND compile_options "-Wnewline-eof")
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list(APPEND compile_options "-Wnonportable-system-include-path")
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list(APPEND compile_options "-Wstrict-prototypes")
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list(APPEND compile_options "-Wthread-safety")
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list(APPEND compile_options "-Wglobal-constructors")
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endif()
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if(LIBC_CONF_MATH_OPTIMIZATIONS)
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list(APPEND compile_options "-DLIBC_MATH=${LIBC_CONF_MATH_OPTIMIZATIONS}")
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endif()
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elseif(MSVC)
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list(APPEND compile_options "/EHs-c-")
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list(APPEND compile_options "/GR-")
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endif()
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if (LIBC_TARGET_OS_IS_GPU)
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list(APPEND compile_options "-nogpulib")
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list(APPEND compile_options "-fvisibility=hidden")
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list(APPEND compile_options "-fconvergent-functions")
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list(APPEND compile_options "-flto")
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list(APPEND compile_options "-Wno-multi-gpu")
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if(LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
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list(APPEND compile_options "-Wno-unknown-cuda-version")
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list(APPEND compile_options "--cuda-feature=+ptx63")
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if(LIBC_CUDA_ROOT)
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list(APPEND compile_options "--cuda-path=${LIBC_CUDA_ROOT}")
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endif()
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elseif(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU)
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list(APPEND compile_options "SHELL:-Xclang -mcode-object-version=none")
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endif()
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endif()
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set(${output_var} ${compile_options} PARENT_SCOPE)
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endfunction()
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function(_get_common_test_compile_options output_var c_test flags)
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_get_compile_options_from_flags(compile_flags ${flags})
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set(compile_options
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${LIBC_COMPILE_OPTIONS_DEFAULT}
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${LIBC_TEST_COMPILE_OPTIONS_DEFAULT}
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${compile_flags})
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if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
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list(APPEND compile_options "-fpie")
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if(LLVM_LIBC_FULL_BUILD)
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list(APPEND compile_options "-DLIBC_FULL_BUILD")
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# Only add -ffreestanding flag in full build mode.
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list(APPEND compile_options "-ffreestanding")
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list(APPEND compile_options "-fno-exceptions")
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list(APPEND compile_options "-fno-unwind-tables")
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list(APPEND compile_options "-fno-asynchronous-unwind-tables")
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if(NOT ${c_test})
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list(APPEND compile_options "-fno-rtti")
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endif()
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endif()
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if(LIBC_COMPILER_HAS_FIXED_POINT)
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list(APPEND compile_options "-ffixed-point")
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endif()
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# list(APPEND compile_options "-Wall")
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# list(APPEND compile_options "-Wextra")
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# -DLIBC_WNO_ERROR=ON if you can't build cleanly with -Werror.
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if(NOT LIBC_WNO_ERROR)
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# list(APPEND compile_options "-Werror")
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endif()
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# list(APPEND compile_options "-Wconversion")
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# list(APPEND compile_options "-Wno-sign-conversion")
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# list(APPEND compile_options "-Wimplicit-fallthrough")
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# list(APPEND compile_options "-Wwrite-strings")
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# list(APPEND compile_options "-Wextra-semi")
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# if(NOT CMAKE_COMPILER_IS_GNUCXX)
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# list(APPEND compile_options "-Wnewline-eof")
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# list(APPEND compile_options "-Wnonportable-system-include-path")
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# list(APPEND compile_options "-Wstrict-prototypes")
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# list(APPEND compile_options "-Wthread-safety")
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# list(APPEND compile_options "-Wglobal-constructors")
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# endif()
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endif()
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set(${output_var} ${compile_options} PARENT_SCOPE)
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endfunction()
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function(_get_hermetic_test_compile_options output_var flags)
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_get_common_test_compile_options(compile_options "" "${flags}")
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list(APPEND compile_options "-fpie")
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list(APPEND compile_options "-ffreestanding")
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list(APPEND compile_options "-fno-exceptions")
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list(APPEND compile_options "-fno-rtti")
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# The GPU build requires overriding the default CMake triple and architecture.
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if(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU)
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list(APPEND compile_options
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-Wno-multi-gpu -nogpulib -mcpu=${LIBC_GPU_TARGET_ARCHITECTURE} -flto
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-mcode-object-version=${LIBC_GPU_CODE_OBJECT_VERSION})
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elseif(LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
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list(APPEND compile_options
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"SHELL:-mllvm -nvptx-emit-init-fini-kernel=false"
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-Wno-multi-gpu --cuda-path=${LIBC_CUDA_ROOT}
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-nogpulib -march=${LIBC_GPU_TARGET_ARCHITECTURE} -fno-use-cxa-atexit)
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endif()
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set(${output_var} ${compile_options} PARENT_SCOPE)
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endfunction()
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