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

[Albert C. <rub...@ml...>]

On Thu, Apr 13, 2006 at 03:51:17PM +0100, Jeremy Henty wrote:
> 
> On Wed, Apr 12, 2006 at 09:03:16AM +0100, Jeremy Henty wrote:
> > On Thu, Apr 06, 2006 at 12:28:30AM -0500, Albert Chin wrote:
> > 
> > > ruby-fltk uses the same compiler used to build ruby. However, if
> > > fltk was built with a C++ compiler, ruby-fltk should use it in
> > > extconf.rb, especially if a non-GCC compiler was used.
> > 
> > I'm not sure I understand.  Both FLTK and Ruby-FLTK are written in
> > C++ so they are *always* built with a C++ compiler.  Ruby-FTLK uses
> > a hack: extconf.rb loads cxx.rb , which goes through the
> > configuration and replaces gcc for g++ .  Do you need something like
> > this to happen for non-gcc compilers too?
> 
> OK, I've investigated a little more.  It turns out that Ruby-FTLK's
> cxx.rb hack is clunky and overkill.  The Makefile correctly specifies
> $(CXX) for *.cc files, so the library gets built with g++ (at least on
> my GNU/Linux system it does).  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? For
Solaris, it's CC. For HP-UX, it's aCC.

> > > How about addition an option, --with-cxx=<compiler> to use for the
> > > compile tests in extconf.rb? How would I do this?
> 
> You know, I just reread this passage of yours more carefully and
> noticed you referred specifically to "the compile tests in
> extconf.rb".  If that's your problem then the change I just committed
> may help.  Can you check out the latest CVS[1] and see if it works?
> It would be really useful for me to know how this works on a non-GNU
> system.  (What is your system, by the way?)

The systems are HP-UX and Solaris.

I checked out CVS but don't see any changes relative to 0.9.3. I
browsed CVS on sf.net but don't see any recent changes there either. I
used the checkout method on the ruby-fltk web page:
  $ cvs -d :pserver:ano...@cv...:/cvsroot/ruby-fltk login
  $ cvs -d :pserver:ano...@cv...:/cvsroot/ruby-fltk checkout -P ruby-fltk

-- 
albert chin (ch...@th...)