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Re: Problem with nm in binutils-2.25-2 on x86


On 10/8/2015 5:35 AM, JonY wrote:
On 10/7/2015 17:57, JonY wrote:
On 10/6/2015 21:12, Ken Brown wrote:
This is a followup to
https://www.cygwin.com/ml/cygwin/2015-10/msg00059.html .

I tried to build icu using gcc-5 and binutils-2.25-2 on x86.  The build
appeared to hang when cygport was stripping executables.  I traced the
problem to a call to 'nm -l' in src_postinst.cygpart.  This produced
errors like the following when called on some of the DLLs:

$ nm -l cygicui18n56.dll
6270c458 b .bssBFD: Dwarf Error: Could not find abbrev number 1151.
6270c594 b .bssBFD: Dwarf Error: Could not find abbrev number 1151.
6270c0cc b .bssBFD: Dwarf Error: Could not find abbrev number 1151.
...

This particular DLL can be found at

   http://sanibeltranquility.com/cygwin/cygicui18n56.dll.xz


Hi Ken,

Are you able to reproduce a test case? Seems to require some complexity
to trigger it.

Actually, it turns out to be quite easy to trigger it. I just tested random programs that were sitting around, and here's the smallest one I found that exhibited the problem:

$ cat getcwd.c
#include <limits.h>
#include <unistd.h>

int
main ()
{
  char buf[PATH_MAX];
  getcwd (buf, PATH_MAX);
}

$ gcc getcwd.c

$ nm -l a.exe
00406000 b .bssBFD: Dwarf Error: Could not find abbrev number 120.
00406018 b .bssBFD: Dwarf Error: Could not find abbrev number 120.
[...]
00406040 b _u.25303BFD: Dwarf Error: Could not find abbrev number 120.
00401000 T _WinMainCRTStartup /usr/src/debug/cygwin-2.2.1-1/winsup/cygwin/crt0.c:23
004070b8 i fthunkBFD: Dwarf Error: Could not find abbrev number 120.
00407074 i hnameBFD: Dwarf Error: Could not find abbrev number 120.

Ken

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