From: Andrew Crabtree <andrewc AT typhoon DOT rose DOT hp DOT com>
Message-Id: <199705191644.AA139310256@typhoon.rose.hp.com>
Subject: Recompiling libc with pgcc
To: djgpp AT delorie DOT com
Date: Mon, 19 May 1997 9:44:15 PDT
Precedence: bulk

Hello - 

I've heard that there is some difficulty getting libc to recompile
with pentium-gcc.  So, I thought I'd post some things to try.  

First - 

Most of the flags are passed to the compiler by using as @file include
syntax.  So, we need to change that file.  

change [dj_dir]/src/gcc.opt as follows

Specify -O6 instead of -O3 (line 2)
Add -Wno-sign-compare after the last line

This takes care of a lot of the problems.  I also had trouble 
with some of the assembly files not getting run through the 
pre-processor.  I think this must have been a screw-up on my part
when unzipping, but I'll describe it anyway.  After a make line like 
so 

as -o ??? *.s 

craps out with something like this 

Error: Invalid character '(' in opcode

I had to use windows explorer to change the extension from .s (lowercase)
to .S (uppercase).  If your plain old dos don't know what happens here.

Most of the other cases should be easy to work around.  If gcc complains
about 'return type default to int' just put an int in as the return type.
If gcc complains that 'var foo may be used unitialized in this function'
then initialize foo to 0 when declared.  

I'll add this to the readme for future release and try to work on getting
DJ a diff to fix the other problems.  

Andrew