The only thing that may be needed is adding extern "C" { ... } to your headers, if C++ detected
But it is needed anyways, because I don't think you want to limit the library usage from C++

#ifdef __cplusplus
#define HEADER_BEGIN extern "C" {
#else
#define HEADER_BEGIN


#ifdef __cplusplus
#define HEADER_END }
#else
#define HEADER_END

And use these in every header
Also, I might have missed the __cplusplus macro name - please google what macro is used when using C++