[antlr-interest] C runtime, VS2005 barfs at generated Initializers for double!!
Jim Idle
jimi at temporal-wave.com
Thu Nov 13 16:02:47 PST 2008
On Thu, 2008-11-13 at 15:28 -0800, Jim Idle wrote:
> On Wed, 2008-11-12 at 19:57 -0800, Vamsi Juvvi wrote:
> > Hi list/the-not-so-idle-idle:
> >
Just a thought here though - have you done something like turn off
extensions in your project? I don't have VS2005 loaded anymore so can't
try this easilly.
Jim
> > While preparing a small antlr presentation for my colleagues I
> > managed to generate code that VS 2005 simply refuses to compile.
> >
> > in my tree parser for a simple calculator example. I have
> >
> > atom returns [double val]
> > : (
> > a=DECIMAL_LITERAL
> > | a=HEX_LITERAL
> > | a=OCTAL_LITERAL
> > )
> > { val = parseInt($a.text);}
> >
> > | a=FLOATING_POINT_LITERAL
> > {val = parseDouble($a.text);}
> > ;
> >
> > The generated code for the atom method does this to initialize val
> >
> > double val = 0.0D;
> >
> > It does not compile unless I remove the D suffix on the 0.0. 0.0D is
> > not a legal double literal for Visual studio C/C++.
>
> Works fine with VS2008. Perhaps your best bet is to compile with
> the .Net C compiler.
>
> > Is there any way I can turn this automatic initialization off ? Or is
> > this a bug that'll need to be fixed in the C templates ? I can
> > workaround this using a struct to wrap my double but that would be
> > perverse.
>
> It is auto-intialized in the templates. However, I suspect that I
> probably changed it to use D for C++ or some other compiler. I will have
> to retest it all to change that.
>
> Jim
>
> >
> > thanks much for reading.
> >
> > -vamsi
> >
> > --
> > Between impulse and reaction lies man's greatest strength: The freedom
> > to create a choice, to create his universe, to choose - Victor Frankl
> > (adapted)
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>
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