Re: helpful hints to build dlls in Win32 using cygwin (gnu)

["Philippe GIACINTI" <giac at dalim dot de>]

Fergus Henderson writes:

>Padmakar Vishnubhatt <padmakar@eng.sun.com> writes:
>
>>I did exactly as u recommended in your hints - and yet I get the
>>following error when I run the linker (ld).  Am I missing something in
>>the cygwin distribution?
>>
>>/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libccrt0.o)(.text+0x
>>8a):libccrt0.cc: undefined reference to `GetModuleHandleA@4'
>
>Your problem is due to `_impure_ptr'.  (By the way, to debug these
>sorts of problems, use the `-Map' and `--cref' options to `ld'.)
>libccrt0.o should not be linked in to DLLs at all.
>The reason that it does get linked in is because it defines `_impure_ptr',
>which is referenced by your code (implicitly, e.g. because stdout
>is #defined as `_impure_ptr._stdout'), and which is
>not defined anywhere else.
>
>You need to provide a definition of `_impure_ptr'.
>You also need to initialize it (otherwise references to stdout
>etc. in your DLL will be bogus).
>


The problem of definition and initialization of _impure_ptr is solved in my
previous patch.
If you use this patch you must link your dll with libccrt0.o and then you have
to add -lkernel32 to your link line ...

regards.

-- 

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|                         Philippe GIACINTI                                |
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