linux-kernel - Re: C++ in linux kernel

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Message-ID: <3d1754a30802110349n684ed0b5ja47f12213e65c2ff@mail.gmail.com>
Date:	Mon, 11 Feb 2008 17:19:34 +0530
From:	"vignesh babu bm" <vigneshbabu@...il.com>
To:	"rohit h" <hrohit85@...il.com>
Cc:	"Jan Engelhardt" <jengelh@...putergmbh.de>,
	"Joonwoo Park" <joonwpark81@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: C++ in linux kernel

http://www.vmware.com/download/server/open_source.html

On Feb 11, 2008 5:07 PM, rohit h <hrohit85@...il.com> wrote:
>
> On Feb 8, 2008 9:24 PM, Jan Engelhardt <jengelh@...putergmbh.de> wrote:
> >
> > On Feb 9 2008 00:14, Joonwoo Park wrote:
> > >2008/2/8, rohit h <hrohit85@...il.com>:
> > >> Hi,
> > >>  I am a kernel newbie.
> > >>  I tried to insmod a C++ module containing classes, inheritance.
> > >>  I am getting 'unresolved symbol' error when I use the 'new' keyword.
> > >>  What could the problem be?
> > >>
> > >>  What kind of runtime support is needed ( arm linux kernel)? Is a
> > >> patch available for it?
> > >>
> > >Please take a look at click modular router which is using c++ as a
> > >linux kernel module.
> > >http://www.read.cs.ucla.edu/click/
> > >The lib/glue.cc provides custom operator new.
> >
> > Uh, let's not make the world worse :)
> > Just call malloc from C++, and carefully select what C++ features
> > you are going to use. The VMware source for example does it right.
> >
>
> From the links given, I dig that following C++ features need runtime support:
>   a. Pure virtual functions
>   b. Global objects  : Needs compiler dependent changes
>   c. new & delete : Can use kmalloc / kfree instead
>   d. Run time type info
>   e. Exceptions
> I guess features d & e need considerable effort.
> Apart from these, am I free to use other C++ features?
> Where could I see the VMWare sources?
>
>
>
> > Compiling the kernel module with g++ is not a simple work, you may
> > need big patch for kernel itself.
>
> I don't want to compile entire kernel.
> I only want to compile my module with g++ and insmod it.
> Any hint on how to write the Makefile.
>
> Thanks in advance,
> Rohit
>
>
>
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