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Date: Tue, 19 Sep 2006 18:30:24 -0400
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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Subject: Re: G77, libg2c and a linking problem
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Angelo Graziosi wrote:
> 
> Dave Korn wrote:
> 
>> Can we then assume that the cernlib build process is doing something
>> unneccessary or unusual or incorrect?
> 
> What would be 'unusual or incorrect' in
> 
> $ cat hello.F
>       program hello
>       implicit none
>       write(*,*) 'Hello!'
>       end
> 
> (1)
> $ g77 hello.F -o hello -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -lg2c
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../libcygwin.a(libcmain.o):(.text+0xab):
>  undefined reference to `_WinMain AT 16'
> collect2: ld returned 1 exit status
> 
> 
> (2)
> $ g77 hello.F -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -lg2c -o hello
> 
> $ ./hello
>  Hello!
> 
> ?
> 
> 
>> It should all become clear in terms of the linker's requirement that
>> undefined references must always come in objects earlier than the
>> symbols that satisfy those references
> 
> I know this...but then '-o hello' contains symbols that satisfy previous
> references ? 
> (compare (1) with (2))


I think you're speculating too much.  What does it do without adding the
library and path in the first case?  I'm not at a Windows box right now
but I get a similar link error from Linux in the first case.  You'll
either see the same thing I do without the library (everything's fine)
or you'll see a different problem.  If it's the former, your problem
is that you added the unneeded library.  If it's the latter, it's an
ordering problem as Dave mentioned.


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

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