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List:       pcc-list
Subject:    Re: [Pcc] compiler error: stmtfree: usdnodes 1
From:       Iain Hibbert <plunky () ogmig ! net>
Date:       2015-09-01 19:59:08
Message-ID: alpine.NEB.2.11.1509012052080.1765 () galant ! ogmig ! net
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On Tue, 1 Sep 2015, Rich Felker wrote:

> On Tue, Sep 01, 2015 at 06:26:28PM +0200, Anders Magnusson wrote:
> > Den 2015-09-01 kl. 12:33, skrev Iain Hibbert:
> > >>The node free checking after a statement failed because one node
> > >>was allocated to "int", and yacc fetches it before the free check to
> > >>see if it is followed by else.
> > >and perhaps not so interesting, but the similar construct
> > >
> > >void foo(int a)
> > >{
> > >	if (a == 0)
> > >		;
> > >
> > >	1;
> > >}
> > >
> > >does still fail with the same error ..
> > >
> > Yep, I know.  Fortunately that type of statement makes no sense, so
> > I have left it for now.
> > I'll fix it in the future.
> 
> It could easily arise via the preprocessor, e.g. for:
> 
> 	if (a == 0);
> 		MACRO1();
> 	MACRO2();
> 
> where MACRO1 is defined to nothing at all for some configurations and
> MACRO2 is something that returns 1 on failure and is defined to
> always-fail on some configurations.

Indeed, that example originated more or less like that in GNU diff. A 
macro was used to remove a function call where not necessary for some 
systems

iain
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