[Bug ld/30359] Create Resource-Only DLL

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30359

--- Comment #5 from Nick Clifton <nickc at redhat dot com> ---
(In reply to Pali Rohár from comment #4)

> > These markers are used by the execution startup code to help find the two
> > tables.
> 
> I see... But in this case there is nothing in .text section, just those
> markers. Does not linker script language support conditions to put markers
> only when at least one of those input sections is non-empty?

Sadly, no.

But of course it is possible to create a copy of the linker script that does
not contain these directives and then use that when creating the dll.  I think
that this could also solve the other problem...

> But still this --only-section does not remove .idata completelly. There is
> still reference to (now removed) import table and objdump prints warning
> about it. Visible also in readpe.

Except - when I tried to create a simple test to verify this I ran into a
problem.  The dll linked OK with my test linker script:

  $ i686-w64-mingw32-ld -dll --subsystem windows -e 0 -s test-rsrc.o -o
test-rsrc.dll -T test-rsrc.ld

and it only has the .rsrc section:

  $ i686-w64-mingw32-objdump -h test-rsrc.2.dll

  test-rsrc.dll:     file format pei-i386

  Sections:
  Idx Name          Size      VMA       LMA       File off  Algn
    0 .rsrc         000000b8  00000000  00000000  00000200  2**2

but, when I checked it with objdump, it complains about the .rsrc section being
corrupt:

  $ i686-w64-mingw32-objdump -p test-rsrc.2.dll

  test-rsrc.2.dll:     file format pei-i386
  [...]
  The .rsrc Resource Directory section:
  000  Type Table: Char: 0, Time: 00000000, Ver: 0/0, Num Names: 0, IDs: 1
  010   Entry: ID: 0x000010, Value: 0x80000018
  018    Name Table: Char: 0, Time: 00000000, Ver: 0/0, Num Names: 0, IDs: 1
  028     Entry: ID: 0x000001, Value: 0x80000030
  030      Language Table: Char: 0, Time: 00000000, Ver: 0/0, Num Names: 0,
IDs: 1
  040       Entry: ID: 0x000409, Value: 0x000048
  048        Leaf: Addr: 0x000058, Size: 0x00005c, Codepage: 0
  Corrupt .rsrc section detected!

I think that this might be due to missing padding at the end of the section,
but I am not sure.  Given that you are a windows expert, perhaps you can find
out more ?

The linker script that I am using looks like this:

  $ cat  test-rsrc.ld
  /* Copyright (C) 2014-2021 Free Software Foundation, Inc.
     Copying and distribution of this script, with or without modification,
     are permitted in any medium without royalty provided the copyright
     notice and this notice are preserved.  */
  OUTPUT_FORMAT(pei-i386)
  SECTIONS
  {
    .rsrc __image_base__ : SUBALIGN(4)
    {
      KEEP (*(.rsrc))
      KEEP (*(.rsrc$*))
    }

    /DISCARD/ : { *(*) }
  }

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