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PR preprocessor/84517 allow double-underscore macros after string literals

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gcc/testsuite:

	PR preprocessor/84517
	* g++.dg/cpp0x/udlit-macros.C: Expect a warning for ""__FILE__.

libcpp:

	PR preprocessor/84517
	* lex.c (is_macro_not_literal_suffix): New function.
	(lex_raw_string, lex_string): Use is_macro_not_literal_suffix to
	decide when to issue -Wliteral-suffix warnings.

From-SVN: r258069
This commit is contained in:
Jonathan Wakely 2018-02-28 15:27:17 +00:00 committed by Jonathan Wakely
parent c6db43fa35
commit b44f8ad8b2
4 changed files with 32 additions and 9 deletions
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5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2018-02-28 Jonathan Wakely <jwakely@redhat.com>
PR preprocessor/84517
* g++.dg/cpp0x/udlit-macros.C: Expect a warning for ""__FILE__.
2018-02-28 Eric Botcazou <ebotcazou@adacore.com>
* c-c++-common/dump-ada-spec-12.c: New test.

2
gcc/testsuite/g++.dg/cpp0x/udlit-macros.C
View File

@ -16,7 +16,7 @@ int operator""_ID(const char*, size_t) { return 0; }
int main()
{
long i64 = 123;
char buf[100];
char buf[] = "xxxxxx"__FILE__; // { dg-warning "invalid suffix on literal" }
sprintf(buf, "%"PRId64"abc", i64); // { dg-warning "invalid suffix on literal" }
return strcmp(buf, "123abc")
+ ""_zero

7
libcpp/ChangeLog
View File

@ -1,3 +1,10 @@
2018-02-28 Jonathan Wakely <jwakely@redhat.com>
PR preprocessor/84517
* lex.c (is_macro_not_literal_suffix): New function.
(lex_raw_string, lex_string): Use is_macro_not_literal_suffix to
decide when to issue -Wliteral-suffix warnings.
2018-02-16 Richard Biener <rguenther@suse.de>
PR bootstrap/82939

27
libcpp/lex.c
View File

@ -1630,6 +1630,21 @@ is_macro(cpp_reader *pfile, const uchar *base)
return !result ? false : (result->type == NT_MACRO);
}
/* Returns true if a literal suffix does not have the expected form
and is defined as a macro. */
static bool
is_macro_not_literal_suffix(cpp_reader *pfile, const uchar *base)
{
/* User-defined literals outside of namespace std must start with a single
underscore, so assume anything of that form really is a UDL suffix.
We don't need to worry about UDLs defined inside namespace std because
their names are reserved, so cannot be used as macro names in valid
programs. */
if (base[0] == '_' && base[1] != '_')
return false;
return is_macro (pfile, base);
}
/* Lexes a raw string. The stored string contains the spelling, including
double quotes, delimiter string, '(' and ')', any leading
@ -1900,10 +1915,8 @@ lex_raw_string (cpp_reader *pfile, cpp_token *token, const uchar *base,
{
/* If a string format macro, say from inttypes.h, is placed touching
a string literal it could be parsed as a C++11 user-defined string
literal thus breaking the program.
Try to identify macros with is_macro. A warning is issued.
The macro name should not start with '_' for this warning. */
if ((*cur != '_') && is_macro (pfile, cur))
literal thus breaking the program. */
if (is_macro_not_literal_suffix (pfile, cur))
{
/* Raise a warning, but do not consume subsequent tokens. */
if (CPP_OPTION (pfile, warn_literal_suffix) && !pfile->state.skipping)
@ -2031,10 +2044,8 @@ lex_string (cpp_reader *pfile, cpp_token *token, const uchar *base)
{
/* If a string format macro, say from inttypes.h, is placed touching
a string literal it could be parsed as a C++11 user-defined string
literal thus breaking the program.
Try to identify macros with is_macro. A warning is issued.
The macro name should not start with '_' for this warning. */
if ((*cur != '_') && is_macro (pfile, cur))
literal thus breaking the program. */
if (is_macro_not_literal_suffix (pfile, cur))
{
/* Raise a warning, but do not consume subsequent tokens. */
if (CPP_OPTION (pfile, warn_literal_suffix) && !pfile->state.skipping)