kubo / funchook

Hook function calls by inserting jump instructions at runtime

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Can't link when used by a C++ project

jaryder opened this issue · comments

Hi there, I was giving your API hook library a try and could not get linking to work (my project is using C++). After quite a bit of digging I found that the problem was C++ name mangling of the function declarations in funchook.h.

You can fix this by adding the following to explicitly use C-linkage conventions:

#ifdef __cplusplus
extern "C" {
#endif

... Your function declarations here ...

#ifdef __cplusplus
} // extern "C"
#endif

That sounds like asking for C++ API for this project. You can try to use something like that: https://github.com/minecraft-linux/server-modloader/tree/master/include/modloader

One drawback is long symbols names. I think it would be nice to find a way to simulate annotations in C++ to use that for hooking API.

For example rust has it:

#[hook(function address goes here)
fn some_hook() {}

#[hook(_ZN4Test3fooEv)
fn hook_by_symbol() {}

@jaryder Thanks for pointing. I fixed it as you requested.
As a workaround, could you include funchook.h as follows until the next release?

extern "C" {
#include <funchook.h>
}