[Bug c++/56411] New: [4.8 regression] Wrong preprocessor output with -std=c++11

[Bug c++/56411] New: [4.8 regression] Wrong preprocessor output with -std=c++11

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56411

             Bug #: 56411
           Summary: [4.8 regression] Wrong preprocessor output with
                    -std=c++11
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ppluzhnikov@google.com


This is a continuation of PR 52538.

Broke somewhere between r195930(ok) and r196104(broken).

cat t.cc

#define FOO(str) sizeof(""str"")
#define BAR(str) sizeof("" str "")

int main()
{
  unsigned long a = FOO("abc");
  unsigned long b = BAR("abc");
}



g++ -E  /tmp/t.cc  | grep sizeof
  unsigned long a = sizeof("""abc""");
  unsigned long b = sizeof("" "abc" "");

g++ -E -std=c++11 /tmp/t.cc  | grep sizeof
  unsigned long a = sizeof(""str"");         <<<< WHAT?
  unsigned long b = sizeof("" "abc" "");

[Bug c++/56411] [4.8 regression] Wrong preprocessor output with -std=c++11

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56411

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-20 19:26:40 UTC ---
See PR55582.  The assumption that you can avoid putting there a space is simply
broken.

[Bug c++/56411] [4.8 regression] Wrong preprocessor output with -std=c++11

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56411

Paul Pluzhnikov <ppluzhnikov at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #2 from Paul Pluzhnikov <ppluzhnikov at google dot com> 2013-02-20 19:32:02 UTC ---
So 'str' is the problem because it begins with 's', and changing it to e.g.
xstr fixes the problem.

Oh, well.

[Bug c++/56411] [4.8 regression] Wrong preprocessor output with -std=c++11

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56411

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-20 19:34:21 UTC ---
Well, if you are already changing the code, just put there space instead.
While right now _ and s are the only characters allowed to start a user defined
literal, I'm pretty sure in the future more will come.