Just do:

~/tmp $ touch ex.c
~/tmp $ LANG= gcc  `pwd` -o ex.o -c ./ex.c
gcc: /home/namsh/tmp: linker input file unused because linking not done
cc1: /home/namsh/tmp: No such file or directory
cc1: 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.

Actually I should do:
~/tmp $ gcc -I/somewhere/includepath -o ex.o -c ./ex.c
I forgot adding '-I'.

gcc --version:
gcc (GCC) 3.4.2 20040727 (prerelease)