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Date: Tue, 17 Mar 2009 02:48:36 +0000
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: under cygwin, zsh cannot run when built against ncurses9-5.7-13
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Peter A. Castro wrote:

> file d3.c:
> ----------------------------------------------------------------
> #include <math.h>
> 
> double my_pow( double d1, double d2 )
> {
>   double d;
>   d = pow(d1,d2);
>   return d;
> }
> ----------------------------------------------------------------
> 
> $ gcc -g -shared -o d3.dll d3.c -lm -lc
> $ objdump -x d3.dll

>         DLL Name: cygwin1.dll
>         vma:  Hint/Ord Member-Name Bound-To

>         412c     1285  pow
> 
>  00004014       00004070 00000000 00000000 0000416c 000040a4
> 
>         DLL Name: cygwin1.dll
>         vma:  Hint/Ord Member-Name Bound-To
>         412c     1285  pow

> Why is 'pow' being pulled in twice?  

  Dunno.  I can't reproduce it.  There must be some environment difference
between your system and mine.  You didn't specify whether you were using gcc3
or gcc4 for that example, so I tried them both, and neither reproduced:

$ cat d3.c
#include <math.h>

double my_pow( double d1, double d2 )
{
  double d;
  d = pow(d1,d2);
  return d;
}

$ gcc-3 -g -shared -o d3.dll d3.c -lm -lc
$ objdump -x d3.dll > with-3.txt
$ gcc-4 -g -shared -o d3.dll d3.c -lm -lc
$ objdump -x d3.dll > with-4.txt
$ diff -pu with-3.txt with-4.txt
--- with-3.txt  2009-03-17 02:34:40.468750000 +0000
+++ with-4.txt  2009-03-17 02:34:56.515625000 +0000
@@ -3,7 +3,7 @@ d3.dll:     file format pei-i386
 d3.dll
 architecture: i386, flags 0x0000013b:
 HAS_RELOC, EXEC_P, HAS_DEBUG, HAS_SYMS, HAS_LOCALS, D_PAGED
-start address 0x10001050
+start address 0x69b41120

  Note this change, it could be relevant.  GCC-4 passes the
'--enable-auto-image-base' option to the linker, which is supposed to help us
avoid fork errors in future.  Here are the import tables:


@@ -61,52 +61,53 @@ Entry d 00000000 00000000 Delay Import D
 Entry e 00000000 00000000 CLR Runtime Header
 Entry f 00000000 00000000 Reserved

-There is an import table in .idata at 0x10004000
+There is an import table in .idata at 0x69b46000

 The Import Tables (interpreted .idata section contents)
  vma:            Hint    Time      Forward  DLL       First
                  Table   Stamp     Chain    Name      Thunk
- 00004000      00004040 00000000 00000000 00004160 00004078
+ 00006000      00006040 00000000 00000000 0000617c 0000607c

        DLL Name: cygwin1.dll
        vma:  Hint/Ord Member-Name Bound-To
-       40ac      351  _impure_ptr
-       40bc      720  calloc
-       40c8      779  cygwin_detach_dll
-       40dc      781  cygwin_internal
-       40f0      802  dll_dllcrt0
-       4100      917  free
-       4108     1183  malloc
-       4114     1282  pow
-       411c     1392  realloc
+       60b4      351  _impure_ptr
+       60c4      720  calloc
+       60d0      779  cygwin_detach_dll
+       60e4      781  cygwin_internal
+       60f8      802  dll_dllcrt0
+       6108      917  free
+       6110     1183  malloc
+       611c     1282  pow
+       6124     1392  realloc

- 00004014      0000406c 00000000 00000000 00004170 000040a4
+ 00006014      0000606c 00000000 00000000 00006190 000060a8

        DLL Name: KERNEL32.dll
        vma:  Hint/Ord Member-Name Bound-To
-       4128      337  GetModuleHandleA
+       6130      337  GetModuleHandleA
+       6144      364  GetProcAddress

- 00004028      00000000 00000000 00000000 00000000 00000000
+ 00006028      00000000 00000000 00000000 00000000 00000000


  As you see, they have sane-looking differences in the VMAs, and neither of
them imports cygwin1.dll twice.

> Again, I'm not sure where to go next.

  Might be worth trying a fresh build of binutils from CVS.  I've just
completed a build of zsh and it exhibits the problem, so I'll see if I can
figure out what's gone wrong.

  BTW to avoid confusion can everyone in this thread please remember to take
care and specify explicit version number suffixes on any examples they show
using gcc!

    cheers,
      DaveK


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