Compile a C++ code snippet using G++ dynamically

Question

Working on a C++ based application, it takes user input and generates a C++ function and compile it to create a .so file and links the function to the main application. Currently had to call an external command "g++" to do it. Wonder if it's possible to call some kind of function, say, "compile" which takes as input an code snippet and produces an .so. More precisely, I need a function that has the following syntax:

sizeOfObjBuf = compile(codeBuf, objBuf);

First parameter is a null terminated string containing a code snippet, the second parameter is the output buffer that hold the compiled code and it returns the size of size of compiled code.

The whole idea is to get rid of dependency on an external program (g++) so the application can run on any Linux system (even when it doesn't have g++ installed).

Thanks.

Answer 1

恐怕答案是“否”。

Answer 2

You could implement that function by executing G++ (or some other compiler) in a separate process and waiting for it to finish, but that still requires the user to have a compiler installed.

You can't compile C++ code without a C++ compiler.

Answer 3

I am not going to do the research to figure out how it is done, but I believe the LLVM C++ compiler can be used in this way. All of the parts of LLVM are designed to run as a library, in theory.

OK, a tiny bit of research and I found this: http://clang.llvm.org/docs/LibTooling.html