From 76d340ac07ad50937aa1ecbfdf0475b010a5700a Mon Sep 17 00:00:00 2001 From: aaw Date: Fri, 27 Apr 2012 14:29:32 +0000 Subject: 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 , 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 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@186909 138bc75d-0d04-0410-961f-82ee72b054a4 --- libcpp/include/cpplib.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'libcpp/include/cpplib.h') diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h index bf59d016231..9dbc477b61e 100644 --- a/libcpp/include/cpplib.h +++ b/libcpp/include/cpplib.h @@ -427,6 +427,10 @@ struct cpp_options /* Nonzero for C++ 2011 Standard user-defnied literals. */ unsigned char user_literals; + /* Nonzero means warn when a string or character literal is followed by a + ud-suffix which does not beging with an underscore. */ + unsigned char warn_literal_suffix; + /* Holds the name of the target (execution) character set. */ const char *narrow_charset; @@ -906,7 +910,8 @@ enum { CPP_W_CXX_OPERATOR_NAMES, CPP_W_NORMALIZE, CPP_W_INVALID_PCH, - CPP_W_WARNING_DIRECTIVE + CPP_W_WARNING_DIRECTIVE, + CPP_W_LITERAL_SUFFIX }; /* Output a diagnostic of some kind. */ -- cgit v1.2.3