build error -- can not find operator new

[George2]

Hello everyone,


I am using Red Hat Enterprise Linux 4 with gcc version 3.4.5. Here is my issue,

1. I have a shared library called libA.so wirtten in C++ and has C interface (extern C wrapper);
2. I have another shared called libB.so, which is written in C and is dependent on libA.so, and I am using -lA to build shared library libB.so and it is successful;
3. I have an application called C, which is written in C and is dependent on shared library libB.so, and when using -lB -lA to build the application C, here are the link error messages,

.//libA.so: undefined reference to `operator new[](unsigned int)
.//libA.so: undefined reference to `operator delete(void*)
.//libA.so: undefined reference to `__gxx_personality_v0

For the whole process, I am using gcc other than g++. And I am wondering how to solve this issue in step 3?

I think we are able to build C application with dependent C++ shared library, right?


thanks in advance,
George

[matsp]

Add -lg++ I think.

Or use "g++" to link your application, and it should add it by default - there is no reason you can't compile and link with g++ even for plain C.

--
Mats

[Salem]

How to mix C and C++
http://www.parashift.com/c++-faq-lit...c-and-cpp.html

[King Mir]

How to mix C and C++
http://www.parashift.com/c++-faq-lit...c-and-cpp.html

If the library is built with a C wrapper, then presumably it is intended to be callable from a C program.

I would look at the library vender's site. There is no standard way to link C++ source code into a C program. C does not have any portable functionality to link code written in any language accept assembly. If somebody wrote a library in C++ that an be called from C, it would be up to them to explain how to link the code.

[brewbuck]

You need to link with -lstdc++.

But really, you should be using g++ to link, not gcc. It doesn't matter if the code is C or C++, g++ can link it either way.