Using SVN r142442, my nightly gcc-4.4.0 boostrapper failed:
Configured with ../gcc/configure --disable-multilib --disable-static
--prefix=/home/edwin/gcc_inst/ --enable-languages=c,c++
--enable-checking=assert,df,fold,gc,misc,rtl,rtlflag,runtime,tree
/home/edwin/gcc-obj/./prev-gcc/xgcc -B/home/edwin/gcc-obj/./prev-gcc/
-B/home/edwin/gcc_inst//x86_64-unknown-linux-gnu/bin/ -c -g -O2 -DIN_GCC -W
-Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual
-Wold-style-definition -Wc++-compat -Wmissing-format-attribute -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/.
-I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include
-I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/bid
-I../libdecnumber -DCLOOG_PPL_BACKEND ../../gcc/gcc/fold-const.c -o
fold-const.o
../../gcc/gcc/fold-const.c:13363: error: dereferencing pointer '__t' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13363: note: initialized from here
../../gcc/gcc/fold-const.c:13377: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13378: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13379: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13380: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13383: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13384: error: dereferencing pointer 'tmp' does break
strict-aliasing rules
../../gcc/gcc/fold-const.c:13376: note: initialized from here
make[3]: *** [fold-const.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [all-stage2-gcc] Error 2
make[1]: *** [stage2-bubble] Error 2
--
Summary: compilation error during bootstrap in fold-const.c
using TOT!
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: edwintorok at gmail dot com
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38408
