RE: Linking VCC with Cygwing Gcc

RE: Linking VCC with Cygwing Gcc

[Michnowicz, Simon G]

Pavel,
	thank you for your response. I compiled a simple function f()
{printf"Hello world\n")
inside VC++. I then tried to call it from a main() {f();} compiled in
cygwin.

However the two did not link as I described.  Maybe there is a link/compile
flag
I need to set to do it..If so, I do not know what they are..

If you like I could send you the source/obj codes

Simon Michnowicz
New Wave - Innovation, Chief Technology Unit
Tel:  03 9253 6769
Fax: 03 9253 6352

Partnering to Deliver Telstra's Competitive Edge.

> -----Original Message-----
> From:	Pavel Tsekov [SMTP:ptsekov@syntrex.com]
> Sent:	Thursday, June 06, 2002 8:04 PM
> To:	Michnowicz, Simon G
> Cc:	'cygwin@cygwin.com'
> Subject:	Re: Linking VCC with Cygwing Gcc
> 
> MSG> The FAQ says that object code between the two compilers can be
> shared,
> MSG> however
> MSG> a simple "hello world" program I wrote gives a linker error, i.e.
> MSG> gcc main.o hello.obj
> MSG> gives an error like " undefined reference to `_chkesp'"
> 
> Do you have the hello.obj compiled for debugging ?

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RE: Linking VCC with Cygwing Gcc

[Larry Hall (RFK Partners, Inc)]

Yes but Pavel's question to you was, did you compile the code with the f()
function in VC++ as "Debug" or "Release"?  You should compile it as release
and compile the Cygwin main function with "gcc -o foo foo.c vcfoo.obj", where
vcfoo.obj is your VC++ object file compiled as "Release".  I just tried your
example here and it worked fine (note I'm using the VC++ compiler from the
command line).  

% cl -c -Id:/Program\ Files/Microsoft\ Visual\ Studio/VC98/Include/ vcfoo.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86
Copyright (C) Microsoft Corp 1984-1998. All rights reserved.

vcfoo.c
% gcc -o foo foo.c vcfoo.obj
% foo
Hello world


This should be enough to verify for you that this can be done, no?


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



At 10:00 PM 6/6/2002, Michnowicz, Simon G wrote:
>Pavel,
>        thank you for your response. I compiled a simple function f()
>{printf"Hello world\n")
>inside VC++. I then tried to call it from a main() {f();} compiled in
>cygwin.
>
>However the two did not link as I described.  Maybe there is a link/compile
>flag
>I need to set to do it..If so, I do not know what they are..
>
>If you like I could send you the source/obj codes
>
>Simon Michnowicz
>New Wave - Innovation, Chief Technology Unit
>Tel:  03 9253 6769
>Fax: 03 9253 6352
>
>Partnering to Deliver Telstra's Competitive Edge.
>
>> -----Original Message-----
>> From: Pavel Tsekov [SMTP:ptsekov@syntrex.com]
>> Sent: Thursday, June 06, 2002 8:04 PM
>> To:   Michnowicz, Simon G
>> Cc:   'cygwin@cygwin.com'
>> Subject:      Re: Linking VCC with Cygwing Gcc
>> 
>> MSG> The FAQ says that object code between the two compilers can be
>> shared,
>> MSG> however
>> MSG> a simple "hello world" program I wrote gives a linker error, i.e.
>> MSG> gcc main.o hello.obj
>> MSG> gives an error like " undefined reference to `_chkesp'"
>> 
>> Do you have the hello.obj compiled for debugging ?
>
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Re: Linking VCC with cygwing Gcc

[Christopher Faylor]

On Thu, Jun 06, 2002 at 10:28:12PM -0400, Larry Hall (RFK Partners, Inc) wrote:
>Yes but Pavel's question to you was, did you compile the code with the f()
>function in VC++ as "Debug" or "Release"?  You should compile it as release
>and compile the Cygwin main function with "gcc -o foo foo.c vcfoo.obj", where
>vcfoo.obj is your VC++ object file compiled as "Release".  I just tried your
>example here and it worked fine (note I'm using the VC++ compiler from the
>command line).  
>
>% cl -c -Id:/Program\ Files/Microsoft\ Visual\ Studio/VC98/Include/ vcfoo.c
>Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86
>Copyright (C) Microsoft Corp 1984-1998. All rights reserved.
>
>vcfoo.c
>% gcc -o foo foo.c vcfoo.obj
>% foo
>Hello world
>
>
>This should be enough to verify for you that this can be done, no?

Btw, I don't think that it has been mentioned yet, but in this scenario,
the sources for foo.c have to be released with the program, since
foo.exe is a cygwin GPL'ed program.  The source for vclfoo.c doesn't
have to be released (IANAL) since it isn't using any cygwin routines.

cgf

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Re: Linking VCC with Cygwing Gcc

[Pavel Tsekov]

MSG> The FAQ says that object code between the two compilers can be shared,
MSG> however
MSG> a simple "hello world" program I wrote gives a linker error, i.e.
MSG> gcc main.o hello.obj
MSG> gives an error like " undefined reference to `_chkesp'"

Do you have the hello.obj compiled for debugging ?


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Linking VCC with Cygwing Gcc

[Michnowicz, Simon G]

I have the job of putting a commercial licencing tool (libraries compiled in
VCC) with
cywgin compiled code (on Windows 2000)

The FAQ hints that this should be possible, however I have not been able to
do this.
Is this possible, especially using multi-tasking code?

The FAQ says that object code between the two compilers can be shared,
however
a simple "hello world" program I wrote gives a linker error, i.e.
gcc main.o hello.obj
gives an error like " undefined reference to `_chkesp'"

The situation gets mroe complicated with libraries and dll's.  

Is there any document anywhere describing the process in more detail, or
with examples?

regards

Simon Michnowicz
New Wave - Innovation, Chief Technology Unit
Tel:  03 9253 6769
Fax: 03 9253 6352

Partnering to Deliver Telstra's Competitive Edge.


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