компилировать стандартные программы на C (compile standard C programs)
Выходные файлы (Output files)
Object files or executable files or both are produced in
unspecified formats. If the pathname of an object file or
executable file to be created by c99 resolves to an existing
directory entry for a file that is not a regular file, it is
unspecified whether c99 shall attempt to create the file or shall
issue a diagnostic and exit with a non-zero exit status.