XL Fortran Enterprise Edition for AIX : User's Guide - IBM

-qwarn64 Option
Syntax
-qwarn64 | -qnowarn64
Aids in porting code from a 32-bit environment to a 64-bit environment by
detecting the truncation of an 8-byte integer pointer to 4 bytes. The -qwarn64
option uses informational messages to identify statements that may cause problems
with the 32-bit to 64-bit migration.
Rules
v The default setting is -qnowarn64.
v You can use the -qwarn64 option in both 32-bit and 64-bit modes.
v The compiler flags the following situations with informational messages:
– The assignment of a reference to the LOC intrinsic to an INTEGER(4)
variable.
– The assignment between an INTEGER(4) variable or INTEGER(4) constant
and an integer pointer.
– The specification of an integer pointer within a common block. We
recommend the -qextchk option for common block length changes.
– The specification of an integer pointer within an equivalence statement.
v We additionally recommend the -qextchk option and interface blocks for
argument checking.
284 XL Fortran Enterprise Edition for AIX : User’s Guide