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Re: problem with groff's pic.y grammar

From: Werner LEMBERG
Subject: Re: problem with groff's pic.y grammar
Date: Fri, 18 Apr 2003 14:41:20 +0200 (CEST)

> I installed this fix. [...]

Hmm, I took the sources of bison-1.875 and applied your patch, but now
I get the following compilation error:

  y.tab.c: In function `int yyparse()':
  y.tab.c:4156: parse error before `goto'

The relevant code snippet:

  | yyerrlab1 -- error raised explicitly by an action.  |

    /* Suppress GCC warning that yyerrlab1 is unused when no action
       invokes YYERROR.  */
  #if defined (__GNUC_MINOR__) && 2093 <= (__GNUC__ * 1000 + __GNUC_MINOR__)
    __attribute__ ((__unused__))

    goto yyerrlab2;

I'm using g++ 2.95.3 -- gcc.info writes about the `unused' attribute:

    This attribute, attached to a function, means that the function is
    meant to be possibly unused.  GNU CC will not produce a warning
    for this function.  GNU C++ does not currently support this
    attribute as definitions without parameters are valid in C++.

It seems that you have to do this:

  #if defined (__GNUC_MINOR__) \
      && 2093 <= (__GNUC__ * 1000 + __GNUC_MINOR__) \
      && !defined (__cplusplus)
    __attribute__ ((__unused__))


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