Re: [ruby-fltk-devel] How to choose alternate C++ compiler?

[Jeremy H. <je...@ch...>]

On Thu, Apr 20, 2006 at 12:08:10PM -0500, Albert Chin wrote:
> On Thu, Apr 13, 2006 at 03:51:17PM +0100, Jeremy Henty wrote:

> > The real need for the cxx.rb hack is so that feature tests for C++
> > code are compiled with g++ .  However you can do that much more
> > easily simply by setting CONFTEST_C = "conftest.cc", so that the
> > .cc extension tells gcc that the test source is C++ .  I have
> > committed this change to CVS.
>
> What if you wish to build with the OS vendor C++ compiler? 

I am hoping these changes will make that happen automatically.  On
GNU/Linux the Makefile compiles *.cc to *.c using $(CXX) .  The CXX
variable isn't defined in the Makefile , so I assume GNU make supplies
the correct value.  To compile the feature tests extconf.rb uses $(CC)
, which is set to gcc in rbconfig.rb .  Luckily gcc knows that *.cc
files are C++ .  If things work the same way on your OS then you're
done!  I can't be sure that they'll work because I don't have access
to other OSes.  If you can send me the Makefile and mkmf.log that your
Ruby-FLTK build creates I can check whether your OS does things the
same way as mine.  (It would be useful to see rbconfig.rb too.)

If the Makefile still chooses the wrong C++ compiler you can try
building with "CXX=<correct-compiler> make".  If that works I can
investigate how to implement a --ccx=<correct-compiler> flag.

What do you get when you run "fltk-config --cxx"?  If you simply need
to build Ruby-FLTK with the same C++ compiler used to build FLTK then
maybe I can hack the Makefile to insert "CXX = `fltk-config --cxx`"
without having to add new build flags.

> I checked out CVS but don't see any changes relative to 0.9.3.

There aren't!  Sourceforge has stopped sync-ing developer CVS with
anonymous CVS while they install new hardware.  Anonymous CVS is
currently identical to 0.9.3 .  I am preparing to release 0.9.4 so you
build that and see which compiler it selects.  This will happen later
today if nothing goes wrong.

Cheers, 

Jeremy Henty