This trivial/obvious patch was committed without review as svn revision 240783. The patch fixes a compile-time error that recently surfaced with big-endian Power architecture builds.
libcpp/ChangeLog: 2016-10-04 Kelvin Nilsen <kel...@gcc.gnu.org> PR target/77847 * lex.c (search_line_fast): Add a FALLTHROUGH comment to correct compiler error in the version of this function that is conditionally compiled when GCC_VERSION >= 4005 and both __ALTIVEC__ and __BIG_ENDIAN__ symbols are defined. Index: libcpp/lex.c =================================================================== --- libcpp/lex.c (revision 240755) +++ libcpp/lex.c (working copy) @@ -733,6 +733,7 @@ if (l != 0) break; s += sizeof(unsigned long); + /* FALLTHROUGH */ case 2: l = u.l[i++]; if (l != 0)