https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99534
Bug ID: 99534
Summary: bogus UDL diagnostic for header-name followed by macro
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: richard-gccbugzilla at metafoo dot co.uk
Target Milestone: ---
Testcase:
#define M
#include "foo.h"M
#include <foo.h>M
This produces two warnings
warning: invalid suffix on literal; C++11 requires a space between literal and
string macro [-Wliteral-suffix]
At least the second diagnostic appears to be incorrect: <foo.h> is not a string
literal and lexically can't have a UDL suffix applied.
The first diagnostic might also be incorrect (the header-name production for
double-quoted strings also can't have a UDL suffix), but the max munch rule
appears to require that we lex a string-literal rather than a header-name here!
I think that's probably a wording bug, and the lexer should prefer to produce a
header-name token whenever possible. (I'm taking that part to WG21 CWG; Clang
also diagnoses this, but EDG does not.)
