[Bug c++/101168] New: gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[Bug c++/101168] New: gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[tuliom at ascii dot art.br]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

            Bug ID: 101168
           Summary: gnu++14 complains about altivec types defined with
                    using keyword in the same file with preprocessor
                    macros
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tuliom at ascii dot art.br
  Target Milestone: ---

Step to reproduce the error:

$ cat issue.cc 
#include <altivec.h>
using vdbl =  __vector double;

#define BREAK 1
$ g++ -std=gnu++14 -c issue.cc 
issue.cc:4:15: error: expected type-specifier before numeric constant
    4 | #define BREAK 1
      |               ^
issue.cc:4:9: note: in expansion of macro ‘BREAK’
    4 | #define BREAK 1
      |         ^~~~~

The error does not reproduce when using -std=c++14.

[Bug preprocessor/101168] gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[guojiufu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

Jiu Fu Guo <guojiufu at gcc dot gnu.org> changed:

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

--- Comment #1 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
This issue seems can also be reproduced at at10.0(gcc6.4.1).

[Bug preprocessor/101168] gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jiu Fu Guo <guojiufu@gcc.gnu.org>:

https://gcc.gnu.org/g:067fe66c8ba9b16feacf66fce9ae668091e42821

commit r13-220-g067fe66c8ba9b16feacf66fce9ae668091e42821
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Mon May 9 17:48:00 2022 +0800

    rs6000: avoid peeking eof after __vector

    There is a rare corner case: where vector is followed only by one
    valid identifer and the ";" which is near the end of the file.

    Like the case in PR101168:
    using vdbl =  __vector double;
    #define BREAK 1

    For this case, "vector double" is followed by CPP_SEMICOLON and then
    EOF.  There is no more tokens need to check for this case.

            PR preprocessor/101168

    gcc/ChangeLog:

            * config/rs6000/rs6000-c.cc (rs6000_macro_to_expand):
            Avoid empty identifier.

    gcc/testsuite/ChangeLog:

            * g++.target/powerpc/pr101168.C: New test.

[Bug preprocessor/101168] gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[guojiufu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

Jiu Fu Guo <guojiufu at gcc dot gnu.org> changed:

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

--- Comment #3 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
Fixed in trunk.

[Bug preprocessor/101168] gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |13.0

[Bug preprocessor/101168] gnu++14 complains about altivec types defined with using keyword in the same file with preprocessor macros

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I noticed s390 has the similar issue, see PR 95782 .