llvm-project

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{
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  "printf": {
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    "LIBC_CONF_PRINTF_DISABLE_FLOAT": {
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      "value": false,
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      "doc": "Disable printing floating point values in printf and friends."
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    },
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    "LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {
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      "value": false,
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      "doc": "Disable index mode in the printf format string."
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    },
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    "LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {
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      "value": false,
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      "doc": "Disable handling of %n in printf format string."
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    },
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    "LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {
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      "value": false,
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      "doc": "Use large table for better printf long double performance."
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    },
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    "LIBC_CONF_PRINTF_DISABLE_FIXED_POINT": {
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      "value": false,
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      "doc": "Disable printing fixed point values in printf and friends."
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    }
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  },
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  "scanf": {
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    "LIBC_CONF_SCANF_DISABLE_FLOAT": {
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      "value": false,
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      "doc": "Disable parsing floating point values in scanf and friends."
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    },
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    "LIBC_CONF_SCANF_DISABLE_INDEX_MODE": {
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      "value": false,
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      "doc": "Disable index mode in the scanf format string."
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    }
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  },
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  "string": {
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    "LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
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      "value": false,
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      "doc": "Read more than a byte at a time to perform byte-string operations like strlen."
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    },
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    "LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
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      "value": false,
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      "doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."
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    }
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  },
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  "codegen": {
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    "LIBC_CONF_KEEP_FRAME_POINTER": {
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      "value": true,
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      "doc": "Keep frame pointer in functions for better debugging experience."
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    },
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    "LIBC_CONF_ENABLE_STRONG_STACK_PROTECTOR": {
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      "value": true,
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      "doc": "Enable -fstack-protector-strong to defend against stack smashing attack."
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    }
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  },
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  "pthread": {
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    "LIBC_CONF_TIMEOUT_ENSURE_MONOTONICITY": {
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      "value": true,
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      "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."
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    },
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    "LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT": {
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      "value": 100,
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      "doc": "Default number of spins before blocking if a mutex is in contention (default to 100)."
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    },
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    "LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT": {
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      "value": 100,
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      "doc": "Default number of spins before blocking if a rwlock is in contention (default to 100)."
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    }
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  },
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  "malloc": {
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    "LIBC_CONF_FREELIST_MALLOC_BUFFER_SIZE": {
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      "value": 1073741824,
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      "doc": "Default size for the constinit freelist buffer used for the freelist malloc implementation (default 1o 1GB)."
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    }
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  },
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  "math": {
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    "LIBC_CONF_MATH_OPTIMIZATIONS": {
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      "value": 0,
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      "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."
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    }
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  }
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}
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