Re: [Corelinux-develop] including corelinux in a project with autoconf

[Frank V. C. <fr...@co...>]

Christophe Prud'homme wrote:

> Hi,
>
> lots of Linux projects use autoconf out there
> so being able to check corelinux existence using autoconf
> would be nice. Unfortunately autoconf doesn't support well
> C++ in the sense that to check libs it uses a m4 macro
> AC_CHECK_LIB this way
>
> AC_CHECK_LIB(cl++, ACCheckCoreLinux,[
> CXXFLAGS="${CXXFLAGS} -I/usr/include/corelinux"
> LDFLAGS="${LDFLAGS} "
> LIBS="${LIBS} -lcl++"
> ],[
>  echo "You need to install corelinux. see http://corelinux.sourceforge.net"
>  exit;
> ],)
>
> where cl++ is corelinux lib and ACCheckCoreLinux some symbol to check in cl++
> but the c++ mangler won't create the symbol ACCheckCoreLinux(more likely
> ACCheckCoreLinux__Fv) and AC_CHECK_LIB will create a C program
>
> char ACCheckCoreLinux();
>
> int main() {
> ACCheckCoreLinux()
> ; return 0; }
>
> and the above test will fail :(
> that is bad !
>
> So people have to create their own checking m4 macros for corelinux
> or bypass the checking of corelinux existence.
>
> We can help them by proving this symbol in corelinux
> by defining this dummy function using extern "C"
>
> extern "C" {
>   int
>   ACCheckCoreLinux()
>   {
>     return 1;
>   }
>
> and put it in libcl++
> and yes it should be documented in the Developper manual
> so that any autoconf user will be very happy. (see the macro above)
>
> well I have already done it in my cvs copy.
>
> comments?

Just put it into it's own module in the src/classlib/corelinux , like where we may
end up putting _init and so on, call it corelinux.cpp and viola if it is not too
late.

>
>
> it seems I like long mails recently :)
> C.
>
> --
> Christophe Prud'homme                |
> MIT, 77, Mass Ave, Rm 3-243          | He that breaks a thing to find out
> Cambridge MA 02139                   | what it is has left the path of wisdom.
> Tel (Office) : (00 1) (617) 253 0229 | -- J.R.R. Tolkien
> Fax (Office) : (00 1) (617) 258 8559 |
> http://augustine.mit.edu/~prudhomm   |
>                           Following the hacker spirit
>
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