Re: Changing the C/C++ compiler for gdb testsuite runs

[Daniel Jacobowitz <drow@mvista.com>]

On Thu, Jan 10, 2002 at 12:09:33PM -0700, Kevin Buettner wrote:
> On Jan 10, 10:58am, Michael Elizabeth Chastain wrote:
> 
> > If you build gcc and gdb in a unified build tree then dejagnu will find
> > and use the uninstalled compiler in the unified build tree, even in
> > preference to $PATH.  That behaviour actually got in my way so I stopped
> > using unified trees.
> 
> Here's one way to use a different compiler in a unified tree...
> 
>     1) In gdb/testsuite (in your build directory), do
> 
> 	    make site.exp
> 
>     2) Add lines similar to the following to the end of
>        gdb/testsuite/site.exp:
>        
> 	    set CC_FOR_TARGET "/some/other/path/to/gcc"
> 	    set CXX_FOR_TARGET "/some/other/path/to/g++"
> 
> If anyone knows of other (more elegant) tricks that can be used to
> accomplish the same thing, I'd like to hear about them...

I do this by different board files.

In dejagnu/baseboards, copy unix.exp.  Edit it.  It should originally
say:

set_board_info compiler  "[find_gcc]";


I have:
set_board_info compiler  "/opt/src/gcc/install-30/bin/gcc";
set_board_info c++compiler  "/opt/src/gcc/install-30/bin/g++";

There's matching variables for all the other compiler types (Java etc). 
I don't yet test those.

Then, to run:
../../../src/dejagnu/runtest --target_board "unix unix3" blah.exp

That will run tests for both the default GCC and the custom in
install-30.  You can also do:
  --target_board "unix/gdb:debug_flags=-gdwarf-2"
to test DWARF-2, or likewise for any other flag.  There's a pure
/dwarf2 option but don't use it; that's dwarf-1 level 2.  I've been
forgetting to file a DejaGNU bug report about this.

The results of this thread should go in the GDB manual somewhere!

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer