[Bug c/18988] New: 4.0 build failure resulting in internal compiler error, not diagnostic.

[schlie at comcast dot net]

Build as of today's cvs 4.0 ~10:10am est, configured with:
../gcc/configure --target=avr --disable-nls --enable-languages=c 

Resulting with failure:

/Applications/avr/gcc-build/gcc/xgcc -B/Applications/avr/gcc-build/gcc/ -B/usr/local/avr/bin/ -B/
usr/local/avr/lib/ -isystem /usr/local/avr/include -isystem /usr/local/avr/sys-include -O2  -DIN_GCC 
-DCROSS_COMPILE   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -DDF=SF -Dinhibit_libc -mcall-prologues -g  -DIN_LIBGCC2 
-D__GCC_FLOAT_NOT_NEEDED -Dinhibit_libc -I. -I -I../../gcc/gcc -I../../gcc/gcc/ -I../../gcc/gcc/../
include -I../../gcc/gcc/../libcpp/include  -DL_fixdfdi -c ../../gcc/gcc/libgcc2.c -o libgcc/./_fixdfdi.o
../../gcc/gcc/libgcc2.c: In function '__fixdfdi':
../../gcc/gcc/libgcc2.c:1198: internal compiler error: in find_valid_class, at reload.c:712
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[2]: *** [libgcc/./_fixdfdi.o] Error 1
make[1]: *** [stmp-multilib] Error 2
make: *** [all-gcc] Error 2

In addition to general hopefully benign warrnings reported via another PR, these
seem more target specific than not, and may have contributed to the failure?:

--- would seem that the code in varasm.c may be broken/fragile?:

gcc -c   -g -O2  -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes  -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. 
-I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include  ../../gcc/gcc/varasm.c -o varasm.o
../../gcc/gcc/varasm.c: In function `assemble_variable':
../../gcc/gcc/varasm.c:1699: warning: empty body in an if-statement
../../gcc/gcc/varasm.c: In function `const_rtx_hash_1':
../../gcc/gcc/varasm.c:2843: warning: right shift count >= width of type

--- wouldn't expect a long double type to be referanced if not required by the target?

gcc -c   -g -O2  -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes  -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. 
-I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include  ../../gcc/gcc/alloc-pool.c -o alloc-pool.o
../../gcc/gcc/alloc-pool.c:48: warning: use of `long double' type; its size may change in a future 
release
../../gcc/gcc/alloc-pool.c:48: warning: (Long double usage is reported only once for each file.
../../gcc/gcc/alloc-pool.c:48: warning: To disable this warning, use -Wno-long-double.)

gcc -c   -g -O2  -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes  -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. 
-I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include  ../../gcc/gcc/ggc-page.c -o ggc-page.o
../../gcc/gcc/ggc-page.c:208: warning: use of `long double' type; its size may change in a future 
release
../../gcc/gcc/ggc-page.c:208: warning: (Long double usage is reported only once for each file.
../../gcc/gcc/ggc-page.c:208: warning: To disable this warning, use -Wno-long-double.)

-- 
           Summary: 4.0 build failure resulting in internal compiler error,
                    not diagnostic.
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schlie at comcast dot net
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-apple-darwin7.6.0
  GCC host triplet: powerpc-apple-darwin7.6.0
GCC target triplet: avr-unknown-none


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18988