From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jon Thackray <jont@harlequin.co.uk>
To: gnu-win32@cygnus.com
Subject: Linking problems
Date: Mon, 07 Jul 1997 12:07:00 -0000
Message-id: <199707071626.RAA17731@zaphod.long.harlequin.co.uk>
References: <199707071404.PAA17360@zaphod.long.harlequin.co.uk>
X-SW-Source: 1997-07/msg00127.html

Jon Thackray writes:
 > 
 > I am still having problem using ld to produce working dlls. I have
 > converted the .lib files I wish to link against into .a files using
 > dlltool (and using nm to create the .def file). However, when I try to
 > link to produce another dll, I find the dll I get is missing its
 > .rdata, .idata and .reloc sections. It also doesn't seem to work very
 > well. I append the linker script and ld command line I used. Here's
 > what objdump thinks of the result, which was produced without error by
 > ld.

Further to this, I have changed the approach as I suspect I'm not
doing the right thing with the link command. I have removed the -r and
added -dy and -shared. After this, I got a load of undefined symbol
references for the __imp symbols. It appears that dlltool generates
these as ___imp, whereas the compiler generating my object files
generates these as __imp. This all works using link. Is there a
version of dlltool about that doesn't prepend this extra _ (it's being
done because it think that is the right thing to do on a 386,
according to the source of dlltool).

 > C:\dyl>objdump --headers threads.dll
 > 
 > threads.dll:     file format pei-i386
 > 
 > Sections:
 > Idx Name          Size      VMA       LMA       File off  Algn
 >   0 .text         00000200  00401000  000000fd  000002b8  2**2
 >                   CONTENTS, ALLOC, LOAD, RELOC, CODE
 >   1 .dyvar        00000200  00402000  00000004  000004b8  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 >   2 .dyfix        00000200  00403000  0000000b  000006b8  2**2
 >                   CONTENTS, ALLOC, LOAD, RELOC, DATA
 > 
 > And here's what I think objdump should have produced, or something
 > like it (this was produced by link).
 > 
 > C:\dyl>objdump --headers j:/releases\pentium-kan/install\x86-win32\bin\threads.dll
 > 
 > j:/releases\pentium-kan/install\x86-win32\bin\threads.dll:     file format pei-i386
 > 
 > Sections:
 > Idx Name          Size      VMA       LMA       File off  Algn
 >   0 .text         00000200  10001000  00000154  00000400  2**2
 >                   CONTENTS, ALLOC, LOAD, CODE
 >   1 .rdata        00000200  10002000  00000126  00000600  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 >   2 .idata        00000400  10003000  000002c8  00000800  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 >   3 .dyvar        00000200  10004000  00000004  00000c00  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 >   4 .dyfix        00000200  10005000  0000000b  00000e00  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 >   5 .reloc        00000200  10006000  00000074  00001000  2**2
 >                   CONTENTS, ALLOC, LOAD, DATA
 > 
 > Finally, here's the link command and script.
 > 
 > 
 > ld -T i386pe.scr -r -E -e _DylanDllEntry@12 -o threads.dll --traditional-format -L. -ldylan j:/releases/pentium-kan/build/x86-win32/threads/_glue.obj j:/releases/pentium-kan/build/x86-win32/threads/threads-library.obj j:/releases/pentium-kan/lib/pentium-run-time/dylan-support.obj
 > 
 > OUTPUT_FORMAT(pei-i386)
 > TARGET(pe-i386)
 > SECTIONS
 > {
 >   .text  __image_base__ + __section_alignment__  : 
 >   {
 >      *(.init)
 >     *(.text)
 >      ___CTOR_LIST__ = .; __CTOR_LIST__ = . ; 
 > 			LONG (-1); *(.ctors); *(.ctor); LONG (0); 
 >      ___DTOR_LIST__ = .; __DTOR_LIST__ = . ; 
 > 			LONG (-1); *(.dtors); *(.dtor);  LONG (0); 
 >      *(.fini)
 >     /* ??? Why is .gcc_exc here?  */
 >      *(.gcc_exc)
 >      etext = .;
 >     /* Grouped section support currently must be explicitly provided for
 > 	in the linker script.  */
 >     *(.text$)
 >   }
 >   .bss BLOCK(__section_alignment__)  :
 >   {
 >     __bss_start__ = . ;
 >     *(.bss)
 >     *(COMMON)
 >     __bss_end__ = . ;
 >   }
 >   .data BLOCK(__section_alignment__) : 
 >   {
 >     __data_start__ = . ; 
 >     *(.data)
 >     *(.data2)
 >     __data_end__ = . ; 
 >     /* Grouped section support currently must be explicitly provided for
 > 	in the linker script.  */
 >     *(.data$)
 >   }
 >   .rdata BLOCK(__section_alignment__) :
 >   {
 >     *(.rdata)
 >     /* Grouped section support currently must be explicitly provided for
 > 	in the linker script.  */
 >     *(.rdata$)
 >   }
 >   .edata BLOCK(__section_alignment__) :
 >   {
 >     *(.edata)
 >   }
 >   .dydat BLOCK(0x1000) :
 >   {
 >     *(.dydat$a)
 >     *(.dydat$m)
 >     *(.dydat$z)
 >   }
 >   .dyobj BLOCK(0x1000) :
 >   {
 >     *(.dyobj$a)
 >     *(.dyobj$m)
 >     *(.dyobj$z)
 >   }
 >   .dyvar BLOCK(0x1000) :
 >   {
 >     *(.dyvar$a)
 >     *(.dyvar$m)
 >     *(.dyvar$z)
 >   }
 >   .dyfix BLOCK(0x1000) :
 >   {
 >     *(.dyfix$a)
 >     *(.dyfix$m)
 >     *(.dyfix$z)
 >   }
 >   /DISCARD/ :
 >   {
 >     *(.debug$S)
 >     *(.debug$T)
 >     *(.debug$F)
 >     *(.drectve)
 >   }
 >   .idata BLOCK(__section_alignment__) :
 >   {
 >     /* This cannot currently be handled with grouped sections.
 > 	See pe.em:sort_sections.  */
 >     *(.idata$2)
 >     *(.idata$3)
 >     *(.idata$4)
 >     *(.idata$5)
 >     *(.idata$6)
 >     *(.idata$7)
 >   }
 >   .CRT BLOCK(__section_alignment__) :
 >   { 					
 >     /* Grouped sections are used to handle .CRT$foo.  */
 >     *(.CRT$)
 >   }
 >   .tls BLOCK(__section_alignment__) :
 >   { 					
 >     *(.tls$)
 >     ;
 >   }
 >   .rsrc BLOCK(__section_alignment__) :
 >   { 					
 >     /* Grouped sections are used to handle .rsrc$0[12].  */
 >     *(.rsrc$)
 >   }
 >   .endjunk BLOCK(__section_alignment__) :
 >   {
 >     /* end is deprecated, don't use it */
 >      end = .;
 >      __end__ = .;
 >   }
 >   .stab BLOCK(__section_alignment__)  (NOLOAD) : 
 >   {
 >     [ .stab ]
 >   }
 >   .stabstr BLOCK(__section_alignment__) (NOLOAD) :
 >   {
 >     [ .stabstr ]
 >   }
 >   .reloc BLOCK(__section_alignment__) :
 >   { 					
 >     *(.reloc)
 >   }
 > }
 > ------- end -------
 > -
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