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Date: Tue, 21 Sep 2004 12:29:43 -0400
To: frederic DOT ormancey AT atosorigin DOT com, Cygwin List <cygwin AT cygwin DOT com>
From: Larry Hall <lh-no-personal-replies-please AT cygwin DOT com>
Subject: Re: Lot of undefined symbols at link time, even with -l option on good libraries
In-Reply-To: <41505394.9020105@atosorigin.com>
References: <414FF698 DOT 4010702 AT atosorigin DOT com> <6 DOT 1 DOT 0 DOT 6 DOT 0 DOT 20040921091604 DOT 03d5b528 AT pop DOT prospeed DOT net> <41505394 DOT 9020105 AT atosorigin DOT com>
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At 12:15 PM 9/21/2004, you wrote:
>I think you're right, it seems to be a problem with trailing underscore in function naming.
>For example :
>
>in /usr/lib/w32api/libkernel32.a we found :
>
>   00000000 T _FormatMessageA AT 28
>                    U __head_libkernel32_a
>   00000000 I __imp__FormatMessageA AT 28
>
>which is required by win32-winbase.o, result of the build of /usr/lib/gcc/win32ada/win32-winbase.adb
>        U _FormatMessageA
>        U _FormatMessageW
>        U _GlobalReAlloc
>        U _LocalReAlloc
>
>The source code for this part is the following :
>  pragma Import (Stdcall, Doit, "FormatMessageA");
>
>I try change it with pragma Import (C, Doit, "_FormatMessageA"); or things like that with no success.
>
>May be it's the trailing @28 after symbol name which cause error, but I cannot control it ( it's DLL calling convention parameter size ). Compiler/linker should usually add or remove trailing @nn if necessary.
>
>To answer your general questions, I'am building a large Ada application ( 200 source files ), using W32 API, with Win2000 GNAT Compiler.
>


Sorry, I know nothing about Ada and how it works.  If the "pragma" statement
is supposed to take the place of the traditional function prototype in C/C++,
then I agree that it looks "OK" (again, based on my knowledge of Ada).  But
the result is that it's looking for symbols that use the 'C' calling 
convention rather than the 'stdcall' calling convention.  The libraries you
are linking to want the 'stdcall' calling convention (since it is the 
default for Windows).  If you cannot get Ada to ask for the proper symbol, 
you could try using the '--enable-stdcall-fixup' option (for 'ld') to 
attempt to massage away the problem.  



--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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