(j3.2006) a question on c_f_pointer call

[Jim Xia]

> "eligible for deallocation". How you can do this without any 
> calculations at pointer assignments or procedure calls is beyond me. 


Aleks, this is an interesting statement.  I'm not sure how many vendors 
are doing the "calculations" at the procedure call to determine whether a 
pointer is eligible for deallocation.  Certainly XLF is not doing it.  I 
can see Cray is not doing it either.  Based on the behaviors of several 
compilers reported by Bill, I'm guessing none of them doing it.  A 
compiler may blindly do a free on a piece of memory to see if it works -- 
that seems to be what gfortran is doing.  So this "calculation" business 
is certainly missing from many compilers.

Even you do a calculation at a procedure call, can you imagine how to do 
this for C_F_POINTER call?  I have no idea how this can be done reliably 
given CPTR only carries a plain C address, no other information.


Cheers,


Jim Xia

XL Fortran Compiler Test
IBM Toronto Lab at 8200 Warden Ave, Markham, On, L6G 1C7
Phone (905) 413-3444  Tie-line 313-3444
email: jimxia at ca.ibm.com
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http://www.ibm.com/software/awdtools/fortran/xlfortran
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