Compiling the vax port with pcc

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

I have just compiled NetBSD/vax 6 beta with pcc on a 4000/90.
It is much faster than gcc (4.1.3), what takes a minute on gcc takes a 
second or two with pcc.

I haven't added so much vax optimizations yet, and (almost) no 
addressing mode matching,
so the resulting code is around 15% bigger than with gcc.

To compile I just did
% make CC=pcc USETOOLS=never NETBSDSRCDIR=/home/ragge/vaxsrc/60beta 
TOOL_TIC=/usr/bin/tic

There were a few problems;
* A c bug in the gcc code that gcc did not notice but pcc bailed out.  
It is fixed in later gcc.
* NetBSD makefiles uses $(CC) to link c++ files, so -lgcc_eh must be 
added th pcc lib list.
* The vax port misses some C90/C99 library functions in libm.  gcc has 
them as builtins when
  given -std=gnu99, so it's usually not noticed.  These should be added 
to libm.

To compile something fetch the latest pcc.  Cross-compiling is currently 
not a good idea due to
the floating point difference.  This will be fixed in a future pcc version.

There are no doubt bugs; I haven't tried to boot a kernel yet, but it 
might work :-)

-- Ragge