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[Bug bootstrap/51537] New: ICE in verify_flow_info while building libstdc++-v3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51537

             Bug #: 51537
           Summary: ICE in verify_flow_info while building libstdc++-v3
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rmansfield@qnx.com
              Host: x86_64-linux-gnu
            Target: arm-unknown-linux-gnueabi
             Build: x86_64-linux-gnu


ICE building libstdc++-v3 on trunk. It started in the last day or so. Might be
a duplicate. I'll try to narrow down the rev

make[4]: Entering directory
`/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src'
/bin/bash ../libtool --tag CXX   --mode=compile
/home/ryan/gnu/gcc/trunk/arm-eabi/./gcc/xgcc -shared-libgcc
-B/home/ryan/gnu/gcc/trunk/arm-eabi/./gcc -nostdinc++
-L/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src
-L/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-B/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/bin/
-B/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/lib/
-isystem
/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/include
-isystem
/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sys-include
   
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/arm-unknown-linux-gnueabi
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include
-I/home/ryan/gnu/gcc/trunk/libstdc++-v3/libsupc++  -fno-implicit-templates
-Wall -Wextra -Wwrite-strings -Wcast-qual  -fdiagnostics-show-location=once 
-ffunction-sections -fdata-sections  -frandom-seed=strstream.lo -g -Os
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward
-Wno-deprecated -c ../../../../libstdc++-v3/src/strstream.cc
libtool: compile:  /home/ryan/gnu/gcc/trunk/arm-eabi/./gcc/xgcc -shared-libgcc
-B/home/ryan/gnu/gcc/trunk/arm-eabi/./gcc -nostdinc++
-L/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src
-L/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-B/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/bin/
-B/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/lib/
-isystem
/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/include
-isystem
/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sys-include
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/arm-unknown-linux-gnueabi
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include
-I/home/ryan/gnu/gcc/trunk/libstdc++-v3/libsupc++ -fno-implicit-templates -Wall
-Wextra -Wwrite-strings -Wcast-qual -fdiagnostics-show-location=once
-ffunction-sections -fdata-sections -frandom-seed=strstream.lo -g -Os
-I/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward
-Wno-deprecated -c ../../../../libstdc++-v3/src/strstream.cc -o strstream.o
In file included from ../../../../libstdc++-v3/src/strstream.cc:45:0:
/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward/strstream:
In member function 'void* std::istrstream::_ZTv0_n12_NSt10istrstreamD0Ev()':
/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward/strstream:134:13:
error: fallthru to exit from bb 2
/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward/strstream:134:13:
error: fallthru edge after a control statement in bb 2
/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward/strstream:134:13:
error: wrong outgoing edge flags at end of bb 2
/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/include/backward/strstream:134:13:
internal compiler error: verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[4]: *** [strstream.lo] Error 1
make[4]: Leaving directory
`/home/ryan/gnu/gcc/trunk/arm-eabi/arm-unknown-linux-gnueabi/libstdc++-v3/src'


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