C++ or pure C for Linux kernel module, Linux device driver development. What to use?
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Umm... what are you good at? Nobody is going to shoot you for writing a driver in C++. If you know how to code better at C++ then use it! Its very easy to link C++ code to C libraries, and I'm sure you can write inline ASM the same way you can in C. With that said I dont see any reason not to use C++, especially if its YOUR project. If others dont like the way you're doing things, tell them to write it their way and send you a patch. Most of them you wont hear from again
Well as I know, modules are simple .o (object files). So, it does matter if it's C or C++... you just need to tell gcc/g++ only to compile and not to link (man g++). Then you can insert the module in the kernel.
At least... not easily, and it isn't guarenteed to work.
In fact, in Linux we did try C++ once already, back in 1992. It sucks. Trust me - writing kernel code in C++ is a BLOODY STUPID IDEA.
The fact is, C++ compilers are not trustworthy. They were even worse in
1992, but some fundamental facts haven't changed: 1) the whole C++ exception handling thing is fundamentally broken. It's _especially_ broken for kernels. 2) any compiler or language that likes to hide things like memory allocations behind your back just isn't a good choice for a kernel. 3) you can write object-oriented code (useful for filesystems etc) in C, _without_ the crap that is C++.
From what I read, the GCC compiler has incorporated some new features (C99) that adopted some changes from C++. There is a book by Novel on Linux kernel development that went into details in how the GCC compiler differs from vanilla C, but I don't remember the details.
Originally posted by jschiwal From what I read, the GCC compiler has incorporated some new features (C99) that adopted some changes from C++. There is a book by Novel on Linux kernel development that went into details in how the GCC compiler differs from vanilla C, but I don't remember the details.
Technically speaking gcc IS a C++ compiler.. it is also a C compiler. The point is, there is no support in the kernel runtime for C++. The only way to get it to work at all is to install some patches that have been notoriously unstable.