access .so file in C and C++

amitp · #1 (**permalink**) 08-21-2008

Hi All,
I created a simple .so file in C program on Linux and accessed it from another C program; I was successful but when I tried to access the same .so file from C++ program it gave me error " undefined reference".

Now in new project I created another .so file in C++ program and accessed it from another CPP program; I was successful but when I tried to access same .so file from C program it gave me error "undefined reference "

What am I supposed to do If I want to access a C program .so file from CPP program or vice versa. Any hints

Thanks in advance..

p50p100 · #2 (**permalink**) 08-23-2008

You should add extern to header file.

Code:

#if defined(__cplusplus)
extern "C"
{
#endif
    //ptototype declare
    char *yourfunction(void);

#if defined(__cplusplus)
}
#endif

If you want to know the reason why it needs,
please compare with results of below command with and without above description.

Code:

readelf -sD libYourlib.so | grep "FUNC *GLOBAL"

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
file access log	jorgelopez100	UNIX for Dummies Questions & Answers	2	07-18-2008 12:09 PM
[C++] File I/O (Reading from a Random-Access File)	VersEtreOuNe	High Level Programming	0	02-12-2008 04:34 PM
HOw I can Know who Access my file!!	geoquest	UNIX for Dummies Questions & Answers	3	06-19-2002 06:10 PM
access file for sendmail	liyas	UNIX for Dummies Questions & Answers	3	10-11-2001 10:10 PM
Need help to access/mount so to access folder/files on a Remote System using Linux OS	S.Vishwanath	UNIX for Dummies Questions & Answers	2	07-30-2001 08:17 AM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by