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| author | Ollie Wild <aaw@google.com> | 2012-04-27 14:29:32 +0000 |
|---|---|---|
| committer | Ollie Wild <aaw@gcc.gnu.org> | 2012-04-27 14:29:32 +0000 |
| commit | 7f5f5f98c5c21e263884362a248e5891e98ac6bc (patch) | |
| tree | 4fb8c09994e5867bbbb9d8cd9a507399b19ac47e /libcpp/init.c | |
| parent | 11ec770e46f664966c53b6af90a2849c1eb4dbd1 (diff) | |
| download | gcc-7f5f5f98c5c21e263884362a248e5891e98ac6bc.tar.gz | |
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 <aaw@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.
From-SVN: r186909
Diffstat (limited to 'libcpp/init.c')
| -rw-r--r-- | libcpp/init.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libcpp/init.c b/libcpp/init.c index 5fa82ca9c3e..3262184c9c5 100644 --- a/libcpp/init.c +++ b/libcpp/init.c @@ -175,6 +175,7 @@ cpp_create_reader (enum c_lang lang, hash_table *table, CPP_OPTION (pfile, warn_variadic_macros) = 1; CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1; CPP_OPTION (pfile, warn_normalize) = normalized_C; + CPP_OPTION (pfile, warn_literal_suffix) = 1; /* Default CPP arithmetic to something sensible for the host for the benefit of dumb users like fix-header. */ |