Compiling .c files using C++ and QT

[koder]

@koder: Qt SDK does not install g++ for you (except the Windows one which comes with MingW) on other platforms you need to install g++ and make.

Right, but on most other systems, gcc/g++ is already available. What I meant to say was: Even the compiler tool chain is taken care of automatically.

NOTE: C++ compilers have the C header files from C standard library, but there are without .h extension and have 'c' prefix: like in place of "#include <stdio.h>" you will write "#include <cstdio>" and so on...

Yes. But be careful. They are not always exactly the same as there C counterparts. And you'd need to put "std::" in front of the functions. So you either use <stdio.h> and printf *OR* you use <cstdio> and std:rintf.
You can also solve this by putting "using namespace std;" at the global scope. This is not advised behavior. But since you are trying to get C code compiled in C++, it is an option.

Also, if you're using C functionality that is differs from C++, you can put an "extern" around it:

// C++ code
extern "C" 
{
    // C code
}
// C++ code

// C++ code
extern "C" 
{
    // C code
}
// C++ code

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This may even be required when creating shared libraries for other C-only applications.