I have a static library of functions written in C. Let's say the header file is called myHeader.h and looks like:
#ifndef MYHEADER_H
#define MYHEADER_H
void function1();
void function2();
#endif
function1 and function2 aren't anything too special. Let's say they exist in a file called impl1.c which looks like:
#include "myHeader.h"
void function1() {
// code
}
void function2() {
// more code
}
All of the code mentioned so far is compiled into some static library called libMyLib.a. I'd rather not modify any of the code used to build this library. I also have a C++ header (cppHeader.h) that looks like:
#ifndef CPPHEADER_H
#define CPPHEADER_H
class CppClass {
private:
double attr1;
public:
void function3();
};
#endif
Then cppHeader.cpp looks like:
#include "cppHeader.h"
#include "myHeader.h"
// constructor
CppClass::CppClass(){}
void CppClass::function3() {
function1();
}
When I try to compile this, I get an error about an undefined reference to function1(). I believe that I've linked everything properly when compiling. I'm pretty rusty in my C++. I'm sure that I'm just doing something stupid. I hope that my simple example code illustrates the problem well enough.
Thanks in advance for any help!
The other solution (to the one suggested originally by Yann) is to surround your "C" header with:
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
Which saves you from having to remember to do:
extern "C" {
#include "foo.h"
}
every place you use foo.h
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