135 lines · json
1{2 "errno": {3 "LIBC_CONF_ERRNO_MODE": {4 "value": "LIBC_ERRNO_MODE_DEFAULT",5 "doc": "The implementation used for errno, acceptable values are LIBC_ERRNO_MODE_DEFAULT, LIBC_ERRNO_MODE_UNDEFINED, LIBC_ERRNO_MODE_THREAD_LOCAL, LIBC_ERRNO_MODE_SHARED, LIBC_ERRNO_MODE_EXTERNAL, and LIBC_ERRNO_MODE_SYSTEM_INLINE."6 }7 },8 "threads": {9 "LIBC_CONF_THREAD_MODE": {10 "value": "LIBC_THREAD_MODE_PLATFORM",11 "doc": "The implementation used for Mutex, acceptable values are LIBC_THREAD_MODE_PLATFORM, LIBC_THREAD_MODE_SINGLE, and LIBC_THREAD_MODE_EXTERNAL."12 }13 },14 "printf": {15 "LIBC_CONF_PRINTF_DISABLE_FLOAT": {16 "value": false,17 "doc": "Disable printing floating point values in printf and friends."18 },19 "LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {20 "value": false,21 "doc": "Disable index mode in the printf format string."22 },23 "LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {24 "value": false,25 "doc": "Disable handling of %n in printf format string."26 },27 "LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {28 "value": false,29 "doc": "Use large table for better printf long double performance."30 },31 "LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_DYADIC_FLOAT": {32 "value": false,33 "doc": "Use dyadic float for faster and smaller but less accurate printf doubles."34 },35 "LIBC_CONF_PRINTF_FLOAT_TO_STR_NO_SPECIALIZE_LD": {36 "value": false,37 "doc": "Use the same mode for double and long double in printf."38 },39 "LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_FLOAT320": {40 "value": false,41 "doc": "Use an alternative printf float implementation based on 320-bit floats"42 },43 "LIBC_CONF_PRINTF_DISABLE_FIXED_POINT": {44 "value": false,45 "doc": "Disable printing fixed point values in printf and friends."46 },47 "LIBC_CONF_PRINTF_DISABLE_STRERROR": {48 "value": false,49 "doc": "Disable handling of %m to print strerror in printf and friends."50 },51 "LIBC_CONF_PRINTF_RUNTIME_DISPATCH": {52 "value": true,53 "doc": "Use dynamic dispatch for the output mechanism to reduce code size."54 }55 },56 "scanf": {57 "LIBC_CONF_SCANF_DISABLE_FLOAT": {58 "value": false,59 "doc": "Disable parsing floating point values in scanf and friends."60 },61 "LIBC_CONF_SCANF_DISABLE_INDEX_MODE": {62 "value": false,63 "doc": "Disable index mode in the scanf format string."64 }65 },66 "string": {67 "LIBC_CONF_STRING_UNSAFE_WIDE_READ": {68 "value": false,69 "doc": "Read more than a byte at a time to perform byte-string operations like strlen."70 },71 "LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {72 "value": false,73 "doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."74 }75 },76 "codegen": {77 "LIBC_CONF_KEEP_FRAME_POINTER": {78 "value": true,79 "doc": "Keep frame pointer in functions for better debugging experience."80 },81 "LIBC_CONF_ENABLE_STRONG_STACK_PROTECTOR": {82 "value": true,83 "doc": "Enable -fstack-protector-strong to defend against stack smashing attack."84 }85 },86 "pthread": {87 "LIBC_CONF_TIMEOUT_ENSURE_MONOTONICITY": {88 "value": true,89 "doc": "Automatically adjust timeout to CLOCK_MONOTONIC (default to true). POSIX API may require CLOCK_REALTIME, which can be unstable and leading to unexpected behavior. This option will convert the real-time timestamp to monotonic timestamp relative to the time of call."90 },91 "LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT": {92 "value": 100,93 "doc": "Default number of spins before blocking if a mutex is in contention (default to 100)."94 },95 "LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT": {96 "value": 100,97 "doc": "Default number of spins before blocking if a rwlock is in contention (default to 100)."98 }99 },100 "math": {101 "LIBC_CONF_MATH_OPTIMIZATIONS": {102 "value": 0,103 "doc": "Configures optimizations for math functions. Values accepted are LIBC_MATH_SKIP_ACCURATE_PASS, LIBC_MATH_SMALL_TABLES, LIBC_MATH_NO_ERRNO, LIBC_MATH_NO_EXCEPT, and LIBC_MATH_FAST."104 },105 "LIBC_CONF_FREXP_INF_NAN_EXPONENT": {106 "value": "",107 "doc": "The value written back to the second parameter when calling frexp/frexpf/frexpl` with `+/-Inf`/`NaN` is unspecified. Configure an explicit exp value for Inf/NaN inputs."108 }109 },110 "qsort": {111 "LIBC_CONF_QSORT_IMPL": {112 "value": "LIBC_QSORT_QUICK_SORT",113 "doc": "Configures sorting algorithm for qsort and qsort_r. Values accepted are LIBC_QSORT_QUICK_SORT, LIBC_QSORT_HEAP_SORT."114 }115 },116 "setjmp": {117 "LIBC_CONF_SETJMP_AARCH64_RESTORE_PLATFORM_REGISTER": {118 "value": true,119 "doc": "Make setjmp save the value of x18, and longjmp restore it. The AArch64 ABI delegates this register to platform ABIs, which can choose whether to make it caller-saved."120 }121 },122 "time": {123 "LIBC_CONF_TIME_64BIT": {124 "value": false,125 "doc": "Force the size of time_t to 64 bits, even on platforms where compatibility considerations would otherwise make it 32-bit."126 }127 },128 "general": {129 "LIBC_ADD_NULL_CHECKS": {130 "value": true,131 "doc": "Add nullptr checks in the library's implementations to some functions for which passing nullptr is undefined behavior."132 }133 }134}135