Linux C program using shared libs written in c/c++

Question

I am doing a project, the main program write in C, it's on a embedded Linux system. the hardware supplied by another company, there I got their libs(static libs both in c and c++ language).for later porting to other devices, I made new libs(shared libs) to link with the applications which in c language,that is: ``` their libs(static libs,c/c++) --> my libs(shared libs,c) --> my applications(c). ``` All the c static libs works good for me, when doing with c++ libs, my libs compiled good, but 2 errors come out when linking to my applications: libplate.so: undefined reference to `operator delete(void*)` libplate.so: undefined reference to `vtable for __cxxabiv1::__class_type_info` here are the makefile parts for compile this shared lib. ``` CFLAGS = -Wall -mlittle-endian -I$(INC_PATH)/plate CPPFLAGS = -Wall -mlittle-endian -I$(PLAT_PATH)/include/sfc -I$(INC_PATH)/plate OBJ = $(patsubst %.c, %.o, $(SRC)) OBJ += $(patsubst %.cpp,%.o,$(SOURCPP)) $(D_LIB):$(OBJ) $(CC) -o $(D_LIB) -lm -lpthre…

Accepted Answer

You need to compile your shared library with g++. Also, you made a mistake with -fPCI. Should be -fPIC. Either that, or for some strange reason you retyped your Makefile here instead of using cut and paste.

So, the line should look like:

```
$(D_LIB):$(OBJ)
    $(CXX) -o $(D_LIB) -lm -lpthread -shared -fPIC $(OBJ) $(LIB)
```

Compiling with g++ links the support libraries that C++ needs as well as making sure to include important information such as type information classes and exceptions.

If their C++ library that you are linking to uses RTTI or exceptions, you will need to link those in. Giving the flags -fno-rtti or -fno-exceptions during the shared object link will only break the program.

Linux C program using shared libs written in c/c++

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