http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57850
--- Comment #4 from Andrey Ponomarenko <aponomarenko at rosalab dot ru> --- It's also used for maintaining binary compatibility of glibc: http://sourceware.org/glibc/wiki/Testing/ABI_checker and by the API Sanity Checker tool for generating unit tests for C/C++ libraries: http://ispras.linuxbase.org/index.php/API_Sanity_Checker
