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RE: Preprocessing Assembly
- From: "Bruce Adams" <bruadams at tycoint dot com>
- To: <cygwin at cygwin dot com>,<crossgcc at sources dot redhat dot com>
- Date: Fri, 13 Sep 2002 14:51:01 +0100
- Subject: RE: Preprocessing Assembly
> -----Original Message-----
> From: Bruce Adams [mailto:email@example.com]
> Sent: Thursday, September 12, 2002 4:39 PM
> To: firstname.lastname@example.org; email@example.com
> Subject: RE: Preprocessing Assembly
> > -----Original Message-----
> > From: Dhananjay R. Deshpande [mailto:firstname.lastname@example.org]
> > Sent: Thursday, September 12, 2002 3:03 PM
> > To: Dhananjay R. Deshpande; Bruce Adams; email@example.com;
> > firstname.lastname@example.org
> > Subject: RE: Preprocessing Assembly
> > > > Is there a way to force gcc to preprocess assembly
> using a switch.
> > >
> > > Yes. Use "-x assembler-with-cop" switch.
> > Typo.. Use "-x assembler-with-cpp" switch.
> Ah ok. Missed that one when I RTFM. You don't need the
> space though. One teensy flaw.
> The prebuilt rtems compiler I'm using (being stuck unable to
> build my own for now) can't find cpp0. I copied that into
> C:\cygwin\opt\rtems\bin from
> C:\cygwin\opt\rtems\lib\gcc-lib\m68k-rtems\2.95.3 and it
> works. However, I now have syntax errors in my assembly but
> the line numbers refer to the preprocessed output rather than
> the original file. Closer inspection of my workaround to use
> gcc -E reveals something more insidious and slightly
> surprising. Gcc -E produces no output at all. This seems to
> go for both the cygwin native gcc and the rtems one. If I
> run cpp0.exe directly I get output. Neither cpp or gcc put
> anything on stdout. I know the preprocessor works (people
> would have noticed if it didn't!) so
> what am I Missing?
> Bruce A.
Okay. I have obtained part of the answer through RTFMing and
Apparently gcc -E doesn't work unless I also use -x assembly-with-cpp
or equally -x c++.
My initial syntax errors were caused by the line directives output by
the preprocessor. Gcc chokes itself. If I disable those using -Wp,-P
then I at least get syntax errors relating to our assembly code, though
the line numbers only make sense if use a two stage process and investigate
the intermediate file.
Another thing it seems to dislike is the use of 0x to signify hexadecimal in
constants. I was all set to change to the alternate notation of an H at the
end when the manual (www.delorie.com/gnu/docs/binutils/as_36.html)
told me this was legal. What else am I missing? :-)
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