Re: [PATCH] BUG preserve registers

[ebiederm@xmission.com (Eric W. Biederman)]

Linus Torvalds <torvalds@transmeta.com> writes:

> On Sat, 9 Feb 2002, Andrew Morton wrote:
> >
> > This is due to BUG() calls in inline functions in headers.  The biggest
> > culprit is dget(), in dcache.h.  This causes the full path of the header file
> > to be expanded into each and every compilation unit which includes
> > dcache.h.
> 
> Hmm. Which brings up another issue: can somebody come up with an idea of
> how to make the thing not use the whole pathname, but only the basename
> relative to the top-of-tree?
> 
> I doubt it is possible, but maybe there is some clever way to avoid it..
> 
> > I'm showing thirteen header files, for a total of 83k.  I'll do something
> > about this...
> 
> Ok, so even your gcc obviously is _not_ intelligent enough to throw away
> strings from inline functions that aren't used. Oh well.

One possibility is to do something like:

ud2
.word __LINE__
.long 1f
.section __FILE__
.linkonce discard
1: .asciz __FILE__
.previous

Which will put each filename string in it's own section and let the
linker merge the duplicates.  I don't know how to wrap all of this up
nicely in a inline asm statement but perhaps someone else can work
out the remaining details.  Ideally I would put a prefix on the name
of all of the sections for easy processing, but string concatenation
doesn't work in asm :(

Eric