gfortran -cpp sometimes confused by '/*'

[sam tygier]

Hello,

I am trying to use some #ifdef in some fortran code in order to smooth 
over a gfortran/ifort difference. This requires using the flag -cpp. 
However this causes a line containing '\*' to be misinterpreted giving 
the error:
Error: unterminated comment
I have tried with 5.1.1 and 4.7.2.

I can reduce the issue down to the program:
        PROGRAM a
         WRITE(*,FMT='( '' /* '' )')
         WRITE(*,FMT='(
      >  '' /* '' )')
        ENDPROGRAM
This compile and runs fine with out -cpp, but the second write statement 
fails with -cpp. Maybe because the parser in cpp detects the first 
instance as being within a string. In ifort it does not cause a problem.

While I can work around this, it seems like the wrong behaviour. Is this 
a bug, or just an inherent limitation.

Thanks,
Sam