{
"errno": {
"LIBC_CONF_ERRNO_MODE": {
"value": "LIBC_ERRNO_MODE_DEFAULT",
"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."
}
},
"printf": {
"LIBC_CONF_PRINTF_DISABLE_FLOAT": {
"value": false,
"doc": "Disable printing floating point values in printf and friends."
},
"LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {
"value": false,
"doc": "Disable index mode in the printf format string."
},
"LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {
"value": false,
"doc": "Disable handling of %n in printf format string."
},
"LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {
"value": false,
"doc": "Use large table for better printf long double performance."
},
"LIBC_CONF_PRINTF_DISABLE_FIXED_POINT": {
"value": false,
"doc": "Disable printing fixed point values in printf and friends."
}
},
"scanf": {
"LIBC_CONF_SCANF_DISABLE_FLOAT": {
"value": false,
"doc": "Disable parsing floating point values in scanf and friends."
},
"LIBC_CONF_SCANF_DISABLE_INDEX_MODE": {
"value": false,
"doc": "Disable index mode in the scanf format string."
}
},
"string": {
"LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
"value": false,
"doc": "Read more than a byte at a time to perform byte-string operations like strlen."
},
"LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
"value": false,
"doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."
}
},
"codegen": {
"LIBC_CONF_KEEP_FRAME_POINTER": {
"value": true,
"doc": "Keep frame pointer in functions for better debugging experience."
},
"LIBC_CONF_ENABLE_STRONG_STACK_PROTECTOR": {
"value": true,
"doc": "Enable -fstack-protector-strong to defend against stack smashing attack."
}
},
"pthread": {
"LIBC_CONF_TIMEOUT_ENSURE_MONOTONICITY": {
"value": true,
"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."
},
"LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT": {
"value": 100,
"doc": "Default number of spins before blocking if a mutex is in contention (default to 100)."
},
"LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT": {
"value": 100,
"doc": "Default number of spins before blocking if a rwlock is in contention (default to 100)."
}
},
"math": {
"LIBC_CONF_MATH_OPTIMIZATIONS": {
"value": 0,
"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."
}
},
"qsort": {
"LIBC_CONF_QSORT_IMPL": {
"value": "LIBC_QSORT_QUICK_SORT",
"doc": "Configures sorting algorithm for qsort and qsort_r. Values accepted are LIBC_QSORT_QUICK_SORT, LIBC_QSORT_HEAP_SORT."
}
},
"setjmp": {
"LIBC_CONF_SETJMP_AARCH64_RESTORE_PLATFORM_REGISTER": {
"value": true,
"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."
}
},
"time": {
"LIBC_CONF_TIME_64BIT": {
"value": false,
"doc": "Force the size of time_t to 64 bits, even on platforms where compatibility considerations would otherwise make it 32-bit."
}
},
"general": {
"LIBC_ADD_NULL_CHECKS": {
"value": true,
"doc": "Add nullptr checks in the library's implementations to some functions for which passing nullptr is undefined behavior."
}
}
}
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