722c066c59
The 32-bit Arm builds of libc define time_t to be `__INTPTR_TYPE__`,
i.e. a 32-bit integer. This is commented in the commit introducing it
(75398f28eb) as being for compatibility with glibc. But in the near
future not even every AArch32 build of glibc will have a 32-bit time_t:
Debian is planning that their next release (trixie) will have switched
to 64-bit. And non-Linux builds of this libc (e.g. baremetal) have no
reason to need glibc compatibility in the first place – and every reason
_not_ to want to start using a 32-bit time_t in 2024 or later.
So I've replaced the `#ifdef` in `llvm-libc-types/time_t.h` with two
versions of the header file, chosen in `CMakeLists.txt` via a new
configuration option. This involved adding an extra parameter to the
cmake `add_header` function to specify different names for the header
file in the source and destination directories.
257 lines
9.9 KiB
CMake
257 lines
9.9 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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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 ${LIBC_COMPILE_OPTIONS_DEFAULT} ${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_compile_options_from_flags(compile_flags ${flags})
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list(APPEND compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags}
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${flags} -fpie -ffreestanding -fno-exceptions -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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if(LLVM_LIBC_FULL_BUILD)
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list(APPEND compile_options "-DLIBC_FULL_BUILD")
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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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