(j3.2006) (SC22WG5.4126) Problems created by some compiler extended size options

Jim Xia jimxia
Fri Nov 13 14:49:35 EST 2009


C standard promotes the parameter if the types doesn't match the formal 
argument.  What is your interface for bindc_function?  Also C compilers 
commonly have options to control size of int.


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
D2/YF7/8200 /MKM


Craig Rasmussen <crasmussen at newmexicoconsortium.org>
WG5 <sc22wg5 at open-std.org>
11/13/2009 02:26 PM
(j3.2006) (SC22WG5.4126) Problems created by some compiler extended size 

There was a discussion at the MPI forum regarding the use of extended 
size compiler options.  It appears that there some options on some 
compilers that promote integers even if the kind parameter is specified.

The problem with this is that it breaks the C interoperability 
standard.  For example, the code,

       integer(C_INT) :: i
       call bindc_function(i)

appears to be broken as the variable i will get promoted.

Is this a common compiler option?  I've been told that users most 
often chose the compiler option that promotes everything, even if an 
explicit kind is provided.

I think this practice is evil!


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