Looking at the failure log, this looks like the new cross-compiler is being used to compile a native part of gcc.
make[3]: Entering directory `/users/joel/test-gcc/b-gcc1-h8300/gcc' /users/joel/test-gcc/b-gcc1-h8300/./gcc/xgcc -B/users/joel/test-gcc/b-gcc1-h8300/./gcc/ -nostdinc -B/users/joel/test-gcc/b-gcc1-h8300/h8300-rtems4.10/newlib/ -isystem /users/joel/test-gcc/b-gcc1-h8300/h8300-rtems4.10/newlib/targ-include -isystem /users/joel/test-gcc/gcc-svn/newlib/libc/include -B/users/joel/test-gcc/install-svn/h8300-rtems4.10/bin/ -B/users/joel/test-gcc/install-svn/h8300-rtems4.10/lib/ -isystem /users/joel/test-gcc/install-svn/h8300-rtems4.10/include -isystem /users/joel/test-gcc/install-svn/h8300-rtems4.10/sys-include -c -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wc++-compat -fno-common -DHAVE_CONFIG_H -I. -I. -I/users/joel/test-gcc/gcc-svn/gcc -I/users/joel/test-gcc/gcc-svn/gcc/. -I/users/joel/test-gcc/gcc-svn/gcc/../include -I/users/joel/test-gcc/gcc-svn/gcc/../libcpp/include -I/users/joel/test-gcc/gcc-svn/gcc/../libdecnumber -I/users/joel/test-gcc/gcc-svn/gcc/../libdecnumber/dpd -I../libdecnumber -I/usr/include/libelf \ /users/joel/test-gcc/gcc-svn/gcc/config/h8300/h8300.c -o h8300.o In file included from /users/joel/test-gcc/gcc-svn/gcc/config/h8300/h8300.c:25:0: /users/joel/test-gcc/gcc-svn/gcc/system.h:199:22: fatal error: strings.h: No such file or directory compilation terminated. make[3]: *** [h8300.o] Error 1 -- Summary: [regression] h8300-rtems fails to build Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: joel at gcc dot gnu dot org GCC target triplet: h8300-rtems4.10 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43584