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From:	Thomas8675309 AT yahoo DOT com (Tom)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Newbie Allegro problems
Date:	20 Nov 2003 07:08:54 -0800
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Eli Zaretskii wrote:

> keri****@hotmail.com wrote:
 
> > I am trying to teach myself sprite usage by looking at the example
> > file exsprite.c but I cannot even get the file to compile as it came
> > with Allegro.  GPP gives me the following errors:
> > 
> > C:\DJGPP\allegro\examples>gpp exsprite.c -o exsprite.exe -lalleg
> > exsprite.c: In function `int main(int, char**)':
> > exsprite.c:100: error: invalid conversion from `void*' to `const RGB*'
> 
> Since exsprite.c has a `.c' extension, it's probably a C program, not
> a C++ program.  So why did you use gpp to compile it?  Please try
> using gcc instead, and see if that helps.

This demonstrates a difference between gxx and gpp that I was not
previously aware of.  gxx, like gcc, uses the file's extension to
decide whether to use the C compiler or C++ compiler.  In contrast,
gpp apparently ignores the file's extension and compiles it using the
C++ compiler.

Both gxx and gpp automatically link in the C++ standard library, while
gcc does not.  And, as I think Eli recently pointed out, gpp interacts
better with Windows XP than gxx does.

Are there other differences in expected behavior between gpp and gxx?

Best regards,

Tom

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