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#  README - gcc crosscompiler patch for PDP 11
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#  Author: Diane Neisius <diane DOT neisius AT web DOT de>
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IMPORTANT NOTE: this patch doesn't remove the bug which causes the libgcc build 
                failure. You have to supply a working lib for yourself.



Installation:
-------------
This patch removes the buggy code generation for logical AND ("&" C operator). 
As a replacement, you must include appropriate AND functions into your pdp11 
libc. You may take my version (file and.s of this package) or write your own.
Patch gcc by:

- unpack your gcc-core-4.3.3.tar.gz to some source directory <gcc-src>

- replace the original file "pdp11.md" in directory <gcc-src>/gcc/config/pdp11/
  by the fixed one from this package.

- build your pdp11 gcc compiler the normal way. I did it this way:
  <gcc-src>/configure --target=pdp11-dec-bsd --disable-nls --without-headers --enable-languages=c
  
make all-gcc
  
make install-gcc


Remarks:
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I used gcc 4.3.3 and binutils 2.19. Maybe the patch also works for other versions
and other options, I tried just the ones mentioned above. Try at own risk.
Libc functions I took from the Xinu source which is stuff I compile for pdp11. 
So, I could get it working without libgcc.

With some minor modifications, I got demo.c program and libsa.a library of the
Xinu source running on my real old PDP-11/03 which proves the patched gcc works.

Have fun!

~Diane.