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To:	"Robert Campbell" <rob AT geonexuscorp DOT com>
cc:	cygwin AT sourceware DOT cygnus DOT com
Subject:	Re: Undefined Reference to WinMain
In-reply-to:	Your message of "Thu, 13 May 1999 15:57:41 MDT."
	<000301be9d8b$9f5ba170$1605a8c0 AT lyra DOT geonexuscorp DOT com>
Date:	Thu, 13 May 1999 17:03:34 -0500
From:	Mumit Khan <khan AT xraylith DOT wisc DOT EDU>

"Robert Campbell" <rob AT geonexuscorp DOT com> writes:
> When compiling up the "V" appgen code, I get the following undefined
> references.  Does anybody have any ideas. (I'm using egcs-1.1.1)
> 
> /cygnus/CYGWIN~1/H-I586~1/i586-cygwin32/bin/ld: warning: cannot find entry
> symbol _WinMainCRTStartup; defaulting to 00401000
> 
> C:\cygnus\CYGWIN~1\H-I586~1\bin/../lib/gcc-lib/i586-cygwin32/egcs-.91.60/../
> ../../../i586-cygwin32/lib/libcygwin.a(libcmain.o): In function `main':
> /home/noer/src/b20/comp-tools/devo/winsup/libcmain.cc:38:
>     undefined reference to  `WinMain AT 16'
> 

Known problem. When linking GUI mode programs, the linker doesn't
explicitly look for WinMain, and if WinMain happens to be in an archive
(as in the case with V GUI), you lose.

Workaround: add "-Wl,-u,_WinMain AT 16" (without the quotes) to GCC flags when 
you link. For more discussion, see the thread titled 'VGUI v 1.21 problem' 
in the Cygwin mailing list archives.

Regards,
Mumit


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