Re: sun2 vs. gcc48

[Chuck Silvers <chuq%chuq.com@localhost>]

On Fri, Nov 21, 2014 at 08:14:02AM -0800, Matt Thomas wrote:
> Unfortunately it's the wrong fix.
> 
> The problem is that -fPIC is being used to build libgcc.a when sun2 doesn't support PIC at all.  Removing that from external/gpl3/gcc/lib/libgcc/arch/m68000/defs.mk also fixes the problem.
> 
> In fact, since we have libgcc_s.so, I wonder if -fPIC should be used for building libgcc for any platform.

here's a patch that implements shared libraries for sun2:
http://ftp.netbsd.org/pub/NetBSD/misc/chs/diff.sun2-shlib.6

I've tested a fair bit in tme and I don't think there's any
new breakage from this patch.


the change I'd particularly like someone to look at is the one in
	src/lib/libc/compiler_rt/Makefile.inc

I'm pretty sure that's not correct but I don't know what would be better.
without that change I get this error trying to link libc.so:

/home/chs/netbsd/trees/sun2-shlib/destdir/sun2/usr/lib/libgcc.a(_float.o): In function `__negsf2':
(.text+0x686): multiple definition of `__negsf2'
libc_pic.a(negsf2.pico):(.text+0x0): first defined here
/home/chs/netbsd/trees/sun2-shlib/destdir/sun2/usr/lib/libgcc.a(_double.o): In function `__negdf2':
(.text+0x8ce): multiple definition of `__negdf2'
libc_pic.a(negdf2.pico):(.text+0x0): first defined here
collect2: error: ld returned 1 exit status
*** [libc.so.12.197] Error code 1

maybe we should exclude the compiler_rt versions of neg* only on m68000?
more generally, what are the rules on what should go in libgcc vs. in libc?


I also noticed that we have a __mulsi3() definition in
src/common/lib/libc/arch/m68k/gen/mulsi3.S
and there's another one in libgcc.
we currently use the libgcc version, and in this diff
I changed things around to use the version in src/common,
but now I don't know why I did that.
everything appears to work fine with the libgcc version.
should we just delete the src/common version?

-Chuck