target/2878: ARM: cannot use 3.0 to build stage 1 of bootstrap; bad code generated at -O0?

[philb@gnu.org]

>Number:         2878
>Category:       target
>Synopsis:       ARM: cannot use 3.0 to build stage 1 of bootstrap; bad code generated at -O0?
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 20 03:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     philb@gnu.org
>Release:        unknown-1.0
>Organization:
>Environment:

>Description:
Bootstrapping the 3.0 branch on arm-linux, using a compiler previously built from the same sources to build stage 1, eventually fails here:

./xgcc -B./ -B/usr/local/armv4l-unknown-linux-gnu/bin/ -isystem /usr/local/armv4l-unknown-linux-gnu/include -O2   -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem ./include  -fomit-frame-pointer -fPIC -g0 -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I/home/pb/egcs/3.0/gcc/gcc -I/home/pb/egcs/3.0/gcc/gcc/. -I/home/pb/egcs/3.0/gcc/gcc/config -I/home/pb/egcs/3.0/gcc/gcc/../include  -DL_bb -c /home/pb/egcs/3.0/gcc/gcc/libgcc2.c -o libgcc/./_bb.o
In file included from /home/pb/egcs/3.0/gcc/gcc/libgcc2.c:1298:
/home/pb/egcs/3.0/gcc/gcc/gcov-io.h: In function `__store_long':
/home/pb/egcs/3.0/gcc/gcc/gcov-io.h:67: Internal compiler error in canon_hash, at cse.c:2463
Please submit a full bug report, with preprocessed source if appropriate.
See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.
make[3]: *** [libgcc/./_bb.o] Error 1

Since it works to use GCC 2.95 for building stage 1, it seems likely that GCC 3.0 is miscompiling itself at -O0.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: