freeradius-server-2.1.10 compiles on HP-UX 11.31 with errors.

Jeffrey Hutzelman jhutz at
Tue Nov 23 16:46:18 CET 2010

--On Tuesday, November 23, 2010 02:38:07 PM +0100 Alan DeKok 
<aland at> wrote:

> Giampiero Torrielli wrote:
>> I compiled and installed freeradius (freeradius-server-2.1.10) on a HPUX
>> 11.31 Itanium V3 system, but I had to make some little code and makefile
>> modifications.
>> I would like to tell you these changes
>> In the file :
>> freeradius-server-2.1.10/src/modules/rlm_eap/rlm_eap.c
>> in the new function static int eap_handler_ptr_cmp, the HP CC compiler
>> gives an error on the returning value type.
>> diff:
>> line 111
>> <   return (a - b);
>> ---
>>>   return ((int)a - (int)b);
>   Ugh.  The result of subtracting two pointers is usually a signed
> integer.  If you're pedantic, "ptrdiff_t".  The compiler shouldn't
> require a cast to "int".
>   I'm not opposed to adding it, but it really doesn't do anything for
> ISO C compatible compilers.

You should be -- if the compiler accepts it at all, it changes the 
semantics.  Casting void * to int is not strictly legal and won't work on 
platforms where void * is larger than int.  That said, the existing code is 
not that great, either -- ptrdiff_t is not guaranteed to fit in an int; in 
fact, I just found a bug last night in another piece of software caused by 
ptrdiff_t being long.

Of course, the OP hasn't reported what the original error was, so I can't 
really suggest a better fix, but I'll bet it involves changing the return 
type of eap_handler_ptr_cmp().

-- Jeff

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