Sample makefile

Sample makefile

[Brunda Sathi]

Hi,
     I am trying to compile an oracle oci sample program "cdemo81.c" which
is under
          d:\oracle\ora92\oci\samples directory. It is referring to a
library called oci.lib which is under
          d:\oracle\ora92\oci\lib\msvc directory.
     All include files are under d:\oracle\ora92\oci\include directory
     cygwin dev tools are under d:\cygwin\bin directory.

My question is how do I create a simple cdemo1.exe file by compiling and
linking (command line).

I tried following command
     D:\Oracle\ora92\oci\samples>gcc -c -Id:\oracle\ora92\oci\include
cdemo81.c

copilation was successful.

     I am trying to link using following command and I am unable to link to
oci.lib.

D:\Oracle\ora92\oci\samples>ld -o cdemo81 -ld:
\oracle\ora92\oci\lib\msvc\oci.lib c
demo81.o -lc

I am getting undefined reference all functions that are called from
oci.lib.

Thanks,
Brunda




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Re: Sample makefile

[Peter A. Castro]

On Fri, 1 Nov 2002, Brunda Sathi wrote:

> Hi,
>      I am trying to compile an oracle oci sample program "cdemo81.c" which
> is under
>           d:\oracle\ora92\oci\samples directory. It is referring to a
> library called oci.lib which is under
>           d:\oracle\ora92\oci\lib\msvc directory.
>      All include files are under d:\oracle\ora92\oci\include directory
>      cygwin dev tools are under d:\cygwin\bin directory.
> 
> My question is how do I create a simple cdemo1.exe file by compiling and
> linking (command line).
> 
> I tried following command
>      D:\Oracle\ora92\oci\samples>gcc -c -Id:\oracle\ora92\oci\include
> cdemo81.c
> 
> copilation was successful.
> 
>      I am trying to link using following command and I am unable to link to
> oci.lib.
> 
> D:\Oracle\ora92\oci\samples>ld -o cdemo81 -ld:\oracle\ora92\oci\lib\msvc\oci.lib cdemo81.o -lc
> 
> I am getting undefined reference all functions that are called from oci.lib.

It would help if you provided the output from the linker so we can see
what's unresolved.  I'm a bit weary that this will work anyway.  Oracle's
OCI libraries were built using the MS Visual C++ environment.  As such,
it has references to things in the MSVCRT an expects to be run in that
environment.  I don't recall if gcc's linker can easily link with the
MSVCRT environment.  Perhaps Christopher can comment on this.

> Thanks,
> Brunda

-- 
Peter A. Castro <doctor@fruitbat.org> or <Peter.Castro@oracle.com>
	"Cats are just autistic Dogs" -- Dr. Tony Attwood



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Re: Sample makefile

[Brunda Sathi]

Here is the output from the linker

D:\Oracle\ora92\oci\samples>ld -o cdemo81 cdemo81.o d:
\oracle\ora92\oci\lib\msvc
\oci.lib d:\oracle\ora92\oci\lib\msvc\msvcrt.lib -lc
cdemo81.o(.text+0xcf7):cdemo81.c: undefined reference to `_impure_ptr'
cdemo81.o(.text+0xd9a):cdemo81.c: undefined reference to `_impure_ptr'
cdemo81.o(.text+0x131f):cdemo81.c: undefined reference to `_impure_ptr'
d:\oracle\ora92\oci\lib\msvc\msvcrt.lib(build/intel/dll_obj/crtexe.obj)
(.text+0x
5e):crtexe.c: undefined reference to `_imp___adjust_fdiv'
d:\oracle\ora92\oci\lib\msvc\msvcrt.lib(build/intel/dll_obj/atonexit.obj)
(.text+
0xf):atonexit.c: undefined reference to `_imp___onexit'

Thanks,
Brunda


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Re: Sample makefile

[Shankar Unni]

On 11/4/2002 9:18 AM, Brunda Sathi wrote:
> Here is the output from the linker
> 
> D:\Oracle\ora92\oci\samples>ld -o cdemo81 cdemo81.o d:
> \oracle\ora92\oci\lib\msvc
> \oci.lib d:\oracle\ora92\oci\lib\msvc\msvcrt.lib -lc

Whoa. Why are you linking "msvcrt.lib"?

I suspect your problems are because you're mixing msvcrt (Microsoft 
Visual C(++) RunTime) and the Cygwin libc.

Try removing msvcrt.lib and see what comes up undefined. Perhaps a 
better bet would be to provide stubs for any undefined libc functions 
referenced from oci.lib that turn around and call the Cygwin libc 
equivalent.
--
Shankar.




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Re: Sample makefile

[lhall]

First, there's no reason to split up the compile and link step.  Do it
in one step unless you know that you need to do otherwise.  You'll generally
have less trouble.  BTW, you can skip '-lc' as well.  You get this by 
default.  That's true for '-lm' too.

So now you know you have undefined references.  Check the objects/libraries
that you're using and see if those symbols are in there.  If not, go looking
for the objects/libraries that do contain those symbols.  If you find the 
symbols but they look a little different (maybe they have @<some number> at
the end), then look up information about calling conventions at 
msdn.microsoft.com.  The information there should allow you to bridge the
gap.

Good luck,

Larry

Original Message:
-----------------
From: Brunda Sathi bsathi@telcordia.com
Date: Mon, 4 Nov 2002 12:18:25 -0500
To: cygwin@cygwin.com
Subject: Re: Sample makefile


Here is the output from the linker

D:\Oracle\ora92\oci\samples>ld -o cdemo81 cdemo81.o d:
\oracle\ora92\oci\lib\msvc
\oci.lib d:\oracle\ora92\oci\lib\msvc\msvcrt.lib -lc
cdemo81.o(.text+0xcf7):cdemo81.c: undefined reference to `_impure_ptr'
cdemo81.o(.text+0xd9a):cdemo81.c: undefined reference to `_impure_ptr'
cdemo81.o(.text+0x131f):cdemo81.c: undefined reference to `_impure_ptr'
d:\oracle\ora92\oci\lib\msvc\msvcrt.lib(build/intel/dll_obj/crtexe.obj)
(.text+0x
5e):crtexe.c: undefined reference to `_imp___adjust_fdiv'
d:\oracle\ora92\oci\lib\msvc\msvcrt.lib(build/intel/dll_obj/atonexit.obj)
(.text+
0xf):atonexit.c: undefined reference to `_imp___onexit'

Thanks,
Brunda


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