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Date:	Fri, 15 Apr 2005 08:46:56 PDT7
From:	"Gregory W. Smith" <gsmith@well.com >
Reply-To:	scoug-programming@scoug.com
To:	scoug-programming@scoug.com
Subject:	SCOUG-Programming: Progress--Step 3

Content Type: text/plain

> "So because LEX and YACC output a C intermediate, the
> untimate compiler can only process C constructs? I guess that
> the g77 and g95 parts of GCC are figments of my
> imagination-even though they manage to compile my old
> dusty deck FORTRAN programs. I guess that I must also
> assume that the Ada and the Java front ends to GCC are also
> incapable of compiling real Ada and Java code."
>
> Greg,
>
> Does an apple look like an orange to you? LEX & YACC, the
> original subjects raised, produce output that goes to a C
> compiler. That implies that the "compiled" source is C even if
> the "inputed" language is not. What happens if the inputed
> language allows expressions, builtin functions, and data types
> not "native" to C?

Lynn,

I am calling for a referee. As I understand it, the input to
LEX is a GRAMMAR. The C output of LEX, when combined with YACC
produces a PARSER. (Referee--correct me here if I am wrong.)

So you are saying that it is impossible to produce a PARSER
for PL/I in a language such as C.

--
Gregory W. Smith (WD9GAY) gsmith@well.com

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