RE: VC++ 6.0 Linker query.

From:

=?Utf-8?B?QnJ1bm8gdmFuIERvb3Jlbg==?= <bruno_nos_pam_van_dooren@hotmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 13 Jul 2006 23:26:01 -0700

Message-ID:

<1B7EB8FA-F2F1-44AB-B921-94801A122A49@microsoft.com>

The functions rijndaelEncrypt and rijndaelKeySeupEnc are clearly defined in
rijndael-alg-fst.c. The compiling goes without any eror, but the linking
throws up errors. I tried fiddling with the options in the linker with no
luck. What am I missing here? I have used Bloodshed till now and compiling
and building worked fine this way.

Below is my build report:

Deleting intermediate files and output files for project 'sfx - Win32
Debug'.
--------------------Configuration: sfx - Win32 Debug--------------------
Compiling resources...
Compiling...
rijndael-alg-fst.c
sfx.cpp
Linking...
sfx.obj : error LNK2001: unresolved external symbol "void __cdecl
rijndaelEncrypt(unsigned int const * const,int,unsigned char const *
const,unsigned char * const)" (?rijndaelEncrypt@@YAXQBIHQBEQAE@Z)
sfx.obj : error LNK2001: unresolved external symbol "int __cdecl
rijndaelKeySetupEnc(unsigned int * const,unsigned char const * const,int)"
(?rijndaelKeySetupEnc@@YAHQAIQBEH@Z)
Debug/sfx.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

How are those functions declared?
If you use C functions in C++ code, the C functions have to be declared like
this in the header file:

#ifdef __cplusplus
extern "C"{
#endif

int foo(void); //your function decls

#ifdef __cplusplus
}
#endif

The reason is that C++ otherwise expects mangled function names instead of
undecoreated names.
You then have to include the header in the C++ file, and the compiler will
know that the functions will be undecorated because of the 'extern "C"'
directive.

--

Kind regards,
    Bruno.
    bruno_nos_pam_van_dooren@hotmail.com
    Remove only "_nos_pam"