Can't preprocess .h file?

[Brad Lucier]

With this version of the compiler:

Reading specs from /export/u10/egcs-test/lib/gcc-lib/alphaev6-unknown-linux-gnu/
2.96/specs
gcc version 2.96 20000717 (experimental)

and this file:

popov-49% cat test.h
#ifdef ___o
o _equ_ ___o
#endif

then 'gcc -E test.c' works fine, but renaming the file to test.h
and trying 'gcc -E test.h' causes gcc to hang.  Is this intended?

Brad Lucier