[Bug preprocessor/60744] New: poor location and error recovery

[Bug preprocessor/60744] New: poor location and error recovery

[manu at gcc dot gnu.org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60744

            Bug ID: 60744
           Summary: poor location and error recovery
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manu at gcc dot gnu.org

#define DEBUG(X) X

void foo(void)
{
    DEBUG((
              0);
}

test.c: In function ‘foo’:
test.c:7:0: error: unterminated argument list invoking macro "DEBUG"
 }
 ^
test.c:5:5: error: ‘DEBUG’ undeclared (first use in this function)
     DEBUG((
     ^
test.c:5:5: note: each undeclared identifier is reported only once for each
function it appears in
test.c:5:5: error: expected ‘;’ at end of input
test.c:5:5: error: expected declaration or statement at end of input


Problems:

1. The first error does not point to the point where the macro was invoked,
which is the key location. Clang gets this right.

2. All the other errors are useless. This should be a fatal error, since it
will gobble the rest of the input and produce meaningless cascades of errors.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60744

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-04-03
     Ever confirmed|0                           |1
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY617

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #13)
> Another option would be to add -stdÉ9 for darwin.

I would suggest that this is the Right Thing to do.

[Bug preprocessor/60744] poor location and error recovery for unterminated argument list invoking macro

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60744

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC's tokenizer does not eat the token for DEBUG and inserts it still.  maybe
eating it is the way to fix this.