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gcc-2.1

Support for CRDS machines was contributed by Gary E. Miller
([email protected])

This file describes the implementation notes of the GNU C Compiler for
the Motorola 68000 on the Charles River Dat Systems Universe 32 running
the UNOS operating system.

This release still depends on the CRDS supplied assembler.
The CRDS assembler has no provision for assembling debug information
so the -g option is broken.

The UNOS assembler is named "casm" instead of "as".
For some strange reason linking "/bin/casm" to "/bin/as" changes the
behavior of casm for the worse.  To allow GCC to function either
change all references to "as" in gcc.c to "casm", or create the
following shell script named /bin/as:
	#!/bin/sh
	casm $*

The default UNOS library is named "libunos.a" instead of "libc.a".  To allow
GCC to function either change all references to "-lc" in gcc.c to "-lunos" or
link "/lib/libunos.a" to "/lib/libc.a".

UNOS uses memory segmentation instead of demand paging so you will need 
a LOT of RAM. 5 Mb is just barely enough to get by on if no other tasks
are running.  if CC1 is too large to link on your machine try putting
the object files in a library and linking from that library.

alloca() expects that the C compiler pops the stack after every function
call.  The Green Hills C compiler version 1.8.0 supplied with UNSO does not.
This behavior causes some programs (GNU make) to crash, and others to merely
grow unbounded (GCC).  To avoid this problem do not use -O in stage1/stage2,
and set CFLAGS=-Wx,-X23 to force Green Hills to pop the stack more often.
After stage2 builds properly then use GCC with the builtin_alloca to compile
an optimized version of GCC as stagees 3 and 4.

The file cccp.c has been modified so that the GNU cpp checks the
default UNOS location /include for include files as well as all the 
standard places.

Before compiling be sure config/crds.h is linked to tm.h, and
config/xm-crds.h is linked to config.h.

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