Re[3]: Cygwin tester? Was: [rfa] Add bfd-in-memory io vector

[Danny Smith <dannysmith@clear.net.nz>]

----- Original Message ----- 
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)  

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;

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);


Should that be:

vars.bim = _bfd_in_memory (abfd, abfd->flags, bim.buffer, bim.size);


Danny