Cygwin tester? Was: [rfa] Add bfd-in-memory io vector

[Andrew Cagney]

Dave, Danny, thanks!

> From: "Danny Smith" 
> | 
> | From: "Danny Smith"
> | 
> | | 
> | | | > On Sat, May 01, 2004 at 02:10:31PM -0400, Andrew Cagney wrote:
> | | | > 
> | | | >>> The testing comment still applies though.
> | | | > 
> | | | > 
> | | | > Given DJ's comment, I think you should test this on cygwin before
> | | | > committing.  If you can't do this yourself, convince someone else
> | | | > to do so for you.  OK to commit once you've done this.
> | | | > 
> 
> Hi,
> 
> Although the patchset works fine (if I add the checks for HAVE_GET[GU]ID) 
> when building .exe files on pe targets, it fails when building dll's 
> (segfault in bfd/bfdio.c:bfd_bread when forwarding args to iovec->bread)  

I'll add this to the patch.

> With binutils built with CFLAGS="-g -O2", gcc-3.4.0, mingw32:
> 
> cat > foo.c
> int foo = 1;
> ^Z
> gcc -shared -ofoo.dll foo.c
> 
> raises the segfault in bfd_bread. 
> 
> Actually, the above testcase fails since your 21-April patch.
> 
> The problem occurs when pe-dll.c code calls bread with a NULL file, asking for zero bytes
> (see comment in cache.c:cache_bread). 
> 
> The problem can be avoided by doing the cache_bread FIXME in bfd_bread, ie:
> 
> *** bfdio.c.cagney Mon May 03 10:02:13 2004
> --- bfdio.c Tue May 04 11:26:40 2004
> *************** bfd_bread (void *ptr, bfd_size_type size
> *** 104,109 ****
> --- 104,113 ----
>   {
>     size_t nread;
>   
> +   /*  See FIXME in cache.c:cache_bread(). */
> +   if (size == 0)
> +     return 0;
> + 
>     nread = abfd->iovec->bread (abfd, ptr, size);
>     if (nread != (size_t) -1)
>       abfd->where += nread;

Outch, thanks.  I think I'll move the fixme as well as a separate patch.

> With above patch, simple dll build is okay. 
> But this looks a bit strange in  peicode.h:pe_ILF_build_a_bfd()
> 
> +  vars.bim = _bfd_in_memory (abfd, abfd->flags, vars.bim->buffer,
> +        vars.bim->size);

Oops, yes.

Andrew

> Should that be:
> 
> vars.bim = _bfd_in_memory (abfd, abfd->flags, bim.buffer, bim.size);
> 
> 
> Danny