Existe uma maneira de compilar C ++ para C código?

Question

Eu tenho um programa que é configurado pelo usuário usando classes C ++ e A mesma classe deve ser usada para configurar um programa que só pode usar um subconjunto de C99 (linguagem aberta cl).

Então, minha pergunta é: Existe uma maneira de compilar C ++ para C-código?

Open Source seria ótimo!

Answer 1

The C++ FAQ has a list of possibilities: Is it possible to convert C++ to C?.

In short, it says that you can't expect this to give you particularly readable code. Think of the complexities involved; multiple inheritance, virtual-function resolution, templates, operator overloading, etc., etc. There's no clean succinct way of expressing these concepts in pure C. If all you're after is compilable C, though, then this is probably the way to go.

Answer 2

You could use the clang C++ frontend to generate llvm bytecode, and use llc to emit C code, see llc doc, especially the c option. Both are open source, with BSD like licenses.

Answer 3

The Comeau compiler seems to be able to do that. From Wikipedia "Rather than produce an executable directly, Comeau C/C++ outputs C code and requires a separate C compiler in order to produce the final program."

I have never tried it, though.

Answer 4

1. Comeau Computing offers a compiler based on Edison Design Group's front end that outputs C code.
2. LLVM is a downloadable compiler that emits C code. See also here and here. Here is an example of C++ to C conversion via LLVM.
3. Cfront, the original implementation of C++, done by Bjarne Stroustrup and others at AT&T, generates C code. However it has two problems: it's been difficult to obtain a license since the mid 90s when it started going through a maze of ownership changes, and development ceased at that same time and so it doesn't get bug fixes and doesn't support any of the newer language features (e.g., exceptions, namespaces, RTTI, member templates).
4. Contrary to popular myth, as of this writing there is no version of g++ that translates C++ to C. Such a thing seems to be doable, but I am not aware that anyone has actually done it (yet).

http://www.cs.technion.ac.il/users/yechiel/c++-faq/convert-to-c.html