Question

I have one function extern "C" int ping(void) in a C++ “static-library” project. Now, I would like to write a simple Hello-World C program that will call this function int x = ping();.

I use g++ / gcc but I cannot link the C executable with C++ shared library. Please, how can one do that? Could you please provide exact gcc commands?

Edit:

g++ -c -static liba.cpp
ar rcs liba.a liba.o
gcc -o x main.o -L. -la

and get:

./liba.a(liba.o):(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'

collect2: ld returned 1 exit status

Answer 1

You may have to use g++ as the linker, not gcc. If the ping() function uses any STL, or exceptions, new, etc, it probably links against libstdc++, which is automatically linked in when you use g++ as the linker.