how to see cpp(C preprocessor) output for a file?

[Chan Kim]

Wow that would be very helpful.
Thank you!
Chan

> -----Original Message-----
> From: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
> Sent: Tuesday, December 14, 2021 9:23 PM
> To: ckim at etri.re.kr; u-boot at lists.denx.de
> Subject: Re: how to see cpp(C preprocessor) output for a file?
> 
> On 14/12/2021 09.23, ckim at etri.re.kr wrote:
> > Hello,
> >
> > Is there any way I can see the cpp output of a file (for example
> > arch/arm/lib/vsprintf.c) after the build? (in the Makefile option for
> > example)
> 
> make foo/bar/baz.i
> 
> for any foo/bar/baz.c file which normally produces foo/bar/baz.o.
> 
> If you have a arch/bla/xyz.S file, you can similarly do
> 
> make arch/bla/xyz.s
> 
> to run the preprocessor on the .S code. And if you want to see the
> assembly generated from a .c file,
> 
> make foo/bar/baz.s
> 
> also works.
> 
> Rasmus