[Bug c/51061] New: Deprecated -I- option causes segfault

["rmansfield at qnx dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51061

             Bug #: 51061
           Summary: Deprecated -I- option causes segfault
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rmansfield@qnx.com
                CC: paolo.carlini@oracle.com
              Host: x86_64-linux-gnu
            Target: arm-unknown-linux-gnueabi
             Build: x86_64-linux-gnu


$ touch t.c
$ ./xgcc -B. -I- t.c
cc1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: arm-unknown-linux-gnueabi
Configured with: ../configure --target=arm-unknown-linux-gnueabi
--prefix=/home/ryan/x-tools/arm-unknown-linux-gnueabi
--with-sysroot=/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sys-root
--disable-multilib
--with-local-prefix=/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sys-root
--disable-nls --enable-threads=posix --enable-symvers=gnu --enable-c99
--enable-long-long --enable-target-optspace
target_alias=arm-unknown-linux-gnueabi --enable-languages=c++ --disable-shared
--disable-libmudflap --disable-libssp
Thread model: posix
gcc version 4.7.0 20111109 (experimental) [trunk revision 181205] (GCC)

After the fix to PR36819, -I- has split_quote_chain calling free_path with a
null path