Re: LOCAL_LABEL_PREFIX and dbxelf.h

[Geoff Keating <geoffk at cygnus dot com>]

> Date: Fri, 04 Feb 2000 17:12:12 +0100
> From: Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
> Cc: gcc-patches@gcc.gnu.org
> 
> At 08:00 04.02.00 , Geoff Keating wrote:
> 
> >It seems that dbxelf.h wants LOCAL_LABEL_PREFIX to be defined, and
> >defaults it to _empty_ if it is not.
> >
> >The symptom of this is that you can't declare anything named 'Letext'.
> >
> >Anyway, this fixes it.
> >
> >--
> >- Geoffrey Keating <geoffk@cygnus.com>
> >
> >===File ~geoffkc/patches/rs6000-dwarfeh-1-llp.patch=========
> >2000-02-01  Geoff Keating  <geoffk@cygnus.com>
> >
> >         * sysv4.h (LOCAL_LABEL_PREFIX): Define, for the use of dbxelf.h.
> 
> AFAI can see this is in no way related to dbxelf.h. It's used in final.c 
> and I can see a definition in svr3.h with a differing comment:
> 
> /* We want local labels to start with period if made with asm_fprintf.  */
> #undef LOCAL_LABEL_PREFIX
> #define LOCAL_LABEL_PREFIX "."
> 
> So what are you trying to fix here?

final uses it to implement the %L asm_fprintf macro.  The only use of
this by the ppc backend is caused by this line in config/dbxelf.h:

#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)			\
  asm_fprintf (FILE,							\
	       "\t.text\n\t.stabs \"\",%d,0,0,%LLetext\n%LLetext:\n", N_SO)

and the macro defaults to the empty string, so this comes out as

	.text
	.stabs "",%d,0,0,Letext
Letext:

which means that if you have a function or variable named 'Letext',
you'll get an assembler error.

-- 
- Geoffrey Keating <geoffk@cygnus.com>