Arnaldo,
Thanks for the quick reply!
On Tue, Mar 25, 2008 at 01:41:03PM -0300, Arnaldo Carvalho de Melo wrote:
> > I have three object files: one is 'dwarves.o' from the pahole
> > distribution, compiled with 'gcc -g'. Another is 'foobar.o' from my
> > own embedded application, compiled with the same compiler, on the same
> > box [1]. The third object file is 'foobar.o' compiled with some
> > version of compiler (Metrowerks?) for the embedded platform that we use.
> >
> > If I use 'objdump -W' on all three files, I get heaps of information,
> > including the structure definitions and other stuff. Good.
>
> can you try with:
>
> # binutils
> readelf -w i build/pahole
>
> # elfutils
> eu-readelf -w i build/pahole
Yup. I get the same (or very similar) information.
> > The most puzzling thing is that two object files, compiled with the
> > same compiler on the same machine have different enough DWARF data
> > that one works with pahole and one doesn't.
> >
> > What can I do to follow through with this? Contact the elfutils
> > maintainers?
>
> Possibly, but can you make these two object files available somewhere?
> I'd like to take a look...
See the attached file. If you just compile it with 'gcc -g -c hello.c',
pahole works fine on the resulting object file. If at line 17 you change
'#if 0' to '#if 1', pahole will complain about the lack of CTF (sorry,
I didn't have time to pull your updates).
Cheers,
florin
--
Bruce Schneier expects the Spanish Inquisition.
http://geekz.co.uk/schneierfacts/fact/163
#include <stdio.h>
struct foo
{
int i;
char c;
float f;
};
struct bar
{
struct foo f;
char c;
int i;
};
#if 0
#pragma BSS(".do_not_init")
struct foo f;
#pragma BSS(DEFAULT_SECTION_BSS)
#endif
int main(void)
{
struct bar b;
printf("Hello, struct bar(%u)!\n", sizeof(b));
return 0;
}
Attachment:
pgpMh4FGn2jS1.pgp
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