GCCC 2.95.3 compiled code on SPARC reproducably SIGBUS's

[Joseph Mallett <jmallett at NewGold dot NET>]

Hi,

I'm working on the Hybrid7 IRCD on SPARC. In a piece of our code, GCC
appears to be doing something very wrong that causes a reproducable NULL
dereference, where the address is taken of a variable and put in a
pointer, and over the lifetime of the function this occurs in, that
pointer becomes a 0, and then is dereferenced to modify the contents of an
element. OR at least, that's how it is looking to me. The code works 
properly on other platforms with GCC and other compilers. On SPARC SunPro 
seems to work fine.

Here is the output of compiling the problematic file with -v:
Reading specs from /usr/lib/gcc-lib/sparc-unknown-openbsd3.0/2.95.3/specs
gcc version 2.95.3 20010125 (prerelease)
 /usr/lib/gcc-lib/sparc-unknown-openbsd3.0/2.95.3/cpp0 -lang-c -v 
-I../include -I/usr/local/include -D__GNUC__=2 -D__GNUC_MINOR__=95 
-D__unix__ -D__sparc__ -D__OpenBSD__ -D__unix__ -D__sparc__ -D__OpenBSD__ 
-Asystem(unix) -Asystem(OpenBSD) -Acpu(sparc) -Amachine(sparc) 
-D__OPTIMIZE__ -g -ggdb -g -Wunused -Wall -Wshadow -Wmissing-declarations 
-DIRCD_PREFIX="/usr/local/ircd" s_serv.c s_serv.i
GNU CPP version 2.95.3 20010125 (prerelease) (sparc)
#include "..." search starts here:
#include <...> search starts here:
 ../include
 /usr/local/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/include/g++
End of omitted list.
 /usr/lib/gcc-lib/sparc-unknown-openbsd3.0/2.95.3/cc1 s_serv.i -quiet 
-dumpbase s_serv.c -g -ggdb -g -O2 -O2 -Wunused -Wall -Wshadow 
-Wmissing-declarations -version -o s_serv.s
GNU C version 2.95.3 20010125 (prerelease) (sparc-unknown-openbsd3.0) 
compiled by GNU C version 2.95.3 20010125 (prerelease).
 as -o s_serv.o s_serv.s

The .i file is attached. core dumps and binaries are available from me on 
request.

Thanks,
	Joseph

-- 
Joseph Mallett jmallett@newgold.net
Need a modular BSD solution? www.xMach.org
Resume: http://srcsys.org/resume.txt

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