1The ground truth of standards 2============================= 3 4Like any modern libc, LLVM libc also supports a wide number of standards and 5extensions. To avoid developing headers, wrappers and sources in a disjointed 6fashion, LLVM libc employs ground truth files. These files live under the 7``spec`` directory and list ground truth corresponding the ISO C standard, the 8POSIX extension standard, etc. For example, the path to the ground truth file 9for the ISO C standard is ``spec/stdc.td``. Tools like the header generator 10(described in the header generation document), docs generator, etc. use the 11ground truth files to generate headers, docs etc. 12