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#1 (**permalink**) 01-04-2008, 10:10 PM

We are trying to link a .cpp main file with a C object(.o) and C++
object(.o) using xlC compiler on IBM-AIX.

Please let us know, if anyone has a solution to this problem described
below.

In g++, These files are compiled and linked well in g++.
But when using xlC, 'Undefined symbol' occurred.

There are 4 files.(All files are zipped..)
-> seedx.h, seedx.c, SEED.cpp(main function included), SEED.h

* source file link:
http://jung0465.cafe24.com/zeroboard...=5& filenum=1

Created objects(.o files) using the following command :
xlC -c seedx.c
xlC -c SEED.cpp

Linking the objects(.o files) :
xlC -o SEED seedx.o SEED.o

This is the error :
ld: 0711-317 ERROR: Undefined symbol: .SeedEncRoundKey__FPUlPUc
ld: 0711-317 ERROR: Undefined symbol: .SeedEncrypt__FPUcPUl
ld: 0711-317 ERROR: Undefined symbol: .SeedDecrypt__FPUcPUl
ld: 0711-317 ERROR: Undefined symbol: .__vn__FUl
ld: 0711-317 ERROR: Undefined symbol: .__dl__FPv
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more
information.

#2 (**permalink**) 01-04-2008, 10:10 PM

GyungChan wrote:
> * source file link:
> http://jung0465.cafe24.com/zerob...

No joy.

> Created objects(.o files) using the following command :
> xlC -c seedx.c
> xlC -c SEED.cpp

You need to declare your C functions inside of an
extern "C" { }
clause. Otherwise, the C++ code presumes that they are C++ functions.
In other words, this is likely a coding error.

> Linking the objects(.o files) :
> xlC -o SEED seedx.o SEED.o
>
> This is the error :
> ld: 0711-317 ERROR: Undefined symbol: .SeedEncRoundKey__FPUlPUc
> ld: 0711-317 ERROR: Undefined symbol: .SeedEncrypt__FPUcPUl
> ld: 0711-317 ERROR: Undefined symbol: .SeedDecrypt__FPUcPUl
> ld: 0711-317 ERROR: Undefined symbol: .__vn__FUl
> ld: 0711-317 ERROR: Undefined symbol: .__dl__FPv

NOt sure about these...standard new and delete operators, so they
ought to get resolved.

Without checking the source code, it's difficult to be any
more precise.

--
Gary R. Hook / AIX PartnerWorld for Developers / These opinions are MINE
__________________________________________________ ______________________

#3 (**permalink**) 01-04-2008, 10:10 PM

jung0465@hanmail.net (GyungChan) writes:

> * source file link:
> http://jung0465.cafe24.com/zeroboard...=5& filenum=1

The link above results in an empty page.

> Created objects(.o files) using the following command :
> xlC -c seedx.c
> xlC -c SEED.cpp
>
> Linking the objects(.o files) :
> xlC -o SEED seedx.o SEED.o
>
> This is the error :

Are the next 3 functions supposed to have C++ linkage?

Chances are they should have C linkage (especially given that they
are likely defined in seedx.c).

> ld: 0711-317 ERROR: Undefined symbol: .SeedEncRoundKey__FPUlPUc
> ld: 0711-317 ERROR: Undefined symbol: .SeedEncrypt__FPUcPUl
> ld: 0711-317 ERROR: Undefined symbol: .SeedDecrypt__FPUcPUl

If so, they probably have incorrect prototype in seedx.h. Correct
prototype should look similar to:

#ifdef __cplustplus
extern "C"
#endif
int SeedEncRoundKey(unsigned long *, unsigned char *);

> ld: 0711-317 ERROR: Undefined symbol: .__vn__FUl
> ld: 0711-317 ERROR: Undefined symbol: .__dl__FPv

The other 2 are strange: they are 'operator new[](unsigned long)' and
'operator delete(void *)'; they are defined in /usr/lib/libC.a, and
I do not understand how you ended up with them being undefined.

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

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Problem : To link a .cpp main file with a C object(.o) and C++ object(.o) using xlc compiler