[Bug c++/21864] New: ICE on invalid command line

["cheinan at atg dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Having a directory name, a -c and -o on the command line causes an ICE and a seg
fault.  The actual code does not seem to matter.  Reproduction instructions and
actual output follow:

cheinan/test> cat null.cpp
int main()
{
   return 0;
}
cheinan/test> g++ /home/cheinan/test -c null.cpp -o MakeMeICE.o
g++: /home/cheinan/test: linker input file unused because linking not done
cc1plus: /home/cheinan/test: No such file or directory
cc1plus: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
cheinan/test> gcc -v
Reading specs from /usr/local/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
Configured with: ../gcc-3.4.3/configure --prefix=/usr/local
--enable-threads=posix --enable-languages=c,c++ --disable-nls
--enable-__cxa_atexit --enable-shared --program-suffix=3.4.3
Thread model: posix
gcc version 3.4.3
cheinan/test>

Workaround:  Fix make file so invalid compiler command lines are not produced.

-- 
           Summary: ICE on invalid command line
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cheinan at atg dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21864