Any special reason for specifying -lm and -lc when building d3.dll?
Without them, pow is mentioned only once in the objdump output. However
on 1.5 pow is mentioned only once, even if -lm and -lc
are specified.
The exact same problem as with zsh, I also run into with fltk's
fluid.exe (from current 1.3 svn) on cygwin 1.7 and gcc 3.4.4.
fltk btw does not link to curses libraries.
Teun
Peter A. Castro schreef:
On Sun, 15 Mar 2009, Dave Korn wrote:
Hi Dave!
Peter A. Castro wrote:
Using the Dependency Walker tool that Chuck pointed out (thanks
Chuck!)
No problem, Basil!
"Basil!" I love it! (you know I was just kidding! :-)
Could this really be a linker problem?
If it's not a linker problem, it has to be a faulty import library.
I can't
think of any other option that would explain how that import table got
munged
like that. I'll see if I can reproduce it.
I've been extracting modules from the import libs and dumping
import/export symbols from the two libncurses DLLs, but I can't seem to
find anything that looks wrong.
However... this I find strange:
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
...
There is an import table in .idata at 0x10004000
The Import Tables (interpreted .idata section contents)
vma: Hint Time Forward DLL First
Table Stamp Chain Name Thunk
00004000 00004050 00000000 00000000 0000416c 00004084
DLL Name: cygwin1.dll
vma: Hint/Ord Member-Name Bound-To
40b8 351 _impure_ptr
40c8 720 calloc
40d4 779 cygwin_detach_dll
40e8 781 cygwin_internal
40fc 802 dll_dllcrt0
410c 917 free
4114 1186 malloc
4120 1395 realloc
412c 1285 pow
00004014 00004070 00000000 00000000 0000416c 000040a4
DLL Name: cygwin1.dll
vma: Hint/Ord Member-Name Bound-To
412c 1285 pow
00004028 0000407c 00000000 00000000 0000417c 000040b0
DLL Name: KERNEL32.dll
vma: Hint/Ord Member-Name Bound-To
4134 337 GetModuleHandleA
0000403c 00000000 00000000 00000000 00000000 00000000
...
Why is 'pow' being pulled in twice? Maybe it's really the math lib stuff
that's tickling the linker? This is kinda looking more like some linker
bug. Again, I'm not sure where to go next. It's been a while since I
dug into gcc...
cheers,
DaveK
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