Bootstrapping with default options or -O0 yields:
stage1/xgcc -Bstage1/ -B/home/charlet/cvs/gcc-obj/install/i686-pc-linux-gnu/bin/ -c -g -O0 -gnatpg -gnata -g -O1 -fno-inline \
-I- -I. -Iada -I../../gcc-head/gcc/ada ../../gcc-head/gcc/ada/a-except.adb -o ada/a-except.o
+===========================GNAT BUG DETECTED==============================+
| 3.5.0 20040909 (experimental) (i686-pc-linux-gnu) GCC error: |
| in peel_address, at tree-ssa-loop-ivopts.c:2554 |
| Error detected at a-exexda.adb:312:8 |
[...]
+==========================================================================+
When forcing compilation of a-except.adb with -O0:
stage1/xgcc -Bstage1/ -B/home/charlet/cvs/gcc-obj/install/i686-pc-linux-gnu/bin/ -c -g -O0 -gnatpg -gnata -g -O0 -fno-inline -I- -I. -Iada -I../../gcc-head/gcc/ada ../../gcc-head/gcc/ada/a-except.adb -o ada/a-except.o
+===========================GNAT BUG DETECTED==============================+
| 3.5.0 20040909 (experimental) (i686-pc-linux-gnu) GCC error: |
| in create_tmp_var_for, at tree-nested.c:138 |
| Error detected at a-exextr.adb:148:8 |
[...]
+==========================================================================+