如何在 GCC 编译器的 c 程序中使用 .lib 文件方法

Question

I have following code:

.Lib file:

contain TRNG_GetRandomData( int *Data, int Size ); Method

.H file (header file):

extern void TRNG_GetRandomData( int *Data, int Size );

.C code (Source file):

#include<OpenDrivers.h>
void main()
{
    int  test[8] ; 
    TRNG_GetRandomData(test,8);
}

and i getting error

undefined reference to TRNG_GetRandomData

Can any one help me solve it?

Answer 1

You need to add option -l infront of your lib file (without the .lib extension) in your Makefile. I am guessing there is some linking issues with header files, are you sure the header files are properly included?

Btw, you can also refer to this question : What are Header Files and Library Files? Hopefully this helps.

Answer 2

I solved similar problem by extracting all object files from *.lib file and adding these files to linker.

ar x lib3rd_party.lib
gcc <flags> -o my_target my_obj1.o my_obj2.o ... 3rd_party_obj1.o 3rd_party_obj2.o ...

It worked. Then I made some "improvement". I "repacked" these object files to static *.a library.

ar r libmylib.a 3rd_party_obj1.o 3rd_party_obj2.o ...

And linked my project with it:

gcc <flags> -static -L<libmylib.a_location> -o my_target my_obj1.o my_obj2.o ... -lmylib

It worked too. Note -lmylib must go after object files.