http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52538
--- Comment #3 from Ollie Wild <aaw at gcc dot gnu.org> 2012-04-27 14:29:39 UTC --- Author: aaw Date: Fri Apr 27 14:29:32 2012 New Revision: 186909 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186909 Log: Add new option, -Wliteral-suffix. This option, which is enabled by default, causes the preprocessor to warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore. According to [lex.ext]p10, this is ill-formed. Also modifies the preprocessor to treat such ill-formed suffixes as separate preprocessing tokens. This is consistent with the Clang front end (see http://llvm.org/viewvc/llvm-project?view=rev&revision=152287), and enables backwards compatibility with code that uses formatting macros from <inttypes.h>, as in the following code block: int main() { int64_t i64 = 123; printf("My int64: %"PRId64"\n", i64); } Google ref b/6377711. 2012-04-27 Ollie Wild <a...@google.com> PR c++/52538 * gcc/c-family/c-common.c: Add CPP_W_LITERAL_SUFFIX mapping. * gcc/c-family/c-opts.c (c_common_handle_option): Handle OPT_Wliteral_suffix. * gcc/c-family/c.opt: Add Wliteral-suffix. * gcc/doc/invoke.texi (Wliteral-suffix): Document new option. * gcc/testsuite/g++.dg/cpp0x/Wliteral-suffix.c: New test. * libcpp/include/cpplib.h (struct cpp_options): Add new field, warn_literal_suffix. (CPP_W_LITERAL_SUFFIX): New enum. * libcpp/init.c (cpp_create_reader): Default initialization of warn_literal_suffix. * libcpp/lex.c (lex_raw_string): Treat user-defined literals which don't begin with '_' as separate tokens and produce a warning. (lex_string): Ditto. Added: trunk/gcc/testsuite/g++.dg/cpp0x/Wliteral-suffix.C Modified: trunk/gcc/ChangeLog trunk/gcc/c-family/ChangeLog trunk/gcc/c-family/c-common.c trunk/gcc/c-family/c-opts.c trunk/gcc/c-family/c.opt trunk/gcc/doc/invoke.texi trunk/gcc/testsuite/ChangeLog trunk/libcpp/ChangeLog trunk/libcpp/include/cpplib.h trunk/libcpp/init.c trunk/libcpp/lex.c
