producing c code from c++

Question

Possible Duplicate:
Code convert from C++ to C

Two months ago, my instructor have asked one question, I have searched to looking for answer but I could not find it.

question :

   From c++ code, how can one  generate c code just using console ( with g++ ) .

How can I do this ?

First generation C++ compiler used to do this..when C++ was simple.. — Nawaz, Jan 27 '11 at 10:27
This might be useful: http://stackoverflow.com/questions/737257/code-convert-from-c-to-c — Gintautas Miliauskas, Jan 27 '11 at 10:30
None of those are valid answers. @Lundin: There are tools that does this, CORBA and SWIG come to mind. — leppie, Jan 27 '11 at 10:44
Is the question about converting C++ code to C, or about dynamically generating C code from a C++ program and feeding that to the compiler? — kusma, Jan 27 '11 at 11:03
CORBA generates code from idl files, not from C++. SWIG I know of as a tool for integrating C++ with Python. — CashCow, Jan 27 '11 at 12:31

score 2 · Accepted Answer · answered Jan 27 '11 at 10:39

2

g++ compiles C++ directly to machine code, it does not first compile to C then compile that.

There may be some compilers that compile to C code first. I do not know of any if you really need the code. It is not the most efficient way to do it though.

I think that is what your instructor was trying to ask you, i.e. if there is a compiler switch to generate C code.

Is there any particular reason why you need to generate C code. Creating a C interface can be useful and there are ways to do this.

answered Jan 27 '11 at 10:39

CashCow

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If I recall correctly, Comeau's compiler can do that. I'm not sure, though. – sellibitze Jan 27 '11 at 10:52
I read that it could but the code is not humanly maintainable. – CashCow Jan 27 '11 at 12:30

score 0 · Answer 2 · answered Jan 27 '11 at 10:48

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I'm far from a GNU expert, but I belive the compiler option would be -std=C89, to enforce compilation to follow the C90 version of the C standard (equivalent to old "ANSI C" which was released in 89, hence the C89), or -std=C99 for the C99 version of the standard.

answered Jan 27 '11 at 10:48

Lundin

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Sure it would, it would give you a syntax error. If you used C++ unique features, then of course you wouldn't be able to compile it in C. – Lundin Jan 27 '11 at 11:04

producing c code from c++

2 Answers2