From:	Waldemar Schultz <schultz AT ma DOT tum DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Linker warning
Date:	Fri, 11 Aug 2000 18:56:07 +0200
Organization:	[posted via] Leibniz-Rechenzentrum, Muenchen (Germany)
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Hans-Bernhard Broeker schrieb:
> Please ave a look at 'gcc -S
> -fverbose-asm' output for both sourcefiles. Pay a particularly close
> look at any occurance of 'head' in the '.stab' (debug info)
> directives.
As the assembler input files bug.s and glob.s are identical produced with
bnu281 and bnu210 as well as using the as.exe210 in a 281 suite causes
the warning, it most probably is a bug in 'as.exe'. 
Unfortunetely my skills don't suffice to interprete any disassembly.
Perhaps anyone can dig into it. IMHO this could be a dangerous bug.

The new reduced formulation of the problem:
is it dangerous to use external global variable names,
that clash with global structure member names with bnu2.10 
when debugging is intended ?

reduced example:

cat bug.c =========
struct _d_t {
 unsigned drive;
 unsigned head;
};

extern int *head;

int main(void) {
 head=0;
 return 0;
}

cat glob.c ========
int *head;

gcc -g bug.c glob.c ======
ld.exe: Warning: type of symbol `_head' changed from 14 to 20 ...

-- 
 Gruss Waldemar Schultz.
 Technische Universität München, Zentrum Mathematik M1, D 80290 München
 Tel: +49 (0)89 2892 8226        FAX: +49 (0)89 2892 8228

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