Enables checking for possible data conversion problems between 32-bit and
64-bit compiler modes.

All generated messages have level Informational.
The -qwarn64 option functions in either 32- or 64-bit compiler
modes. In 32-bit mode, it functions as a preview aid to discover
possible 32- to 64-bit migration problems.
Informational messages are displayed where data conversion may cause
problems in 64-bit compilation mode, such as:
- truncation due to explicit or implicit conversion of long types
into int types
- unexpected results due to explicit or implicit conversion of
int types into long types
- invalid memory references due to explicit conversion by cast operations of
pointer types into int types
- invalid memory references due to explicit conversion by cast operations of
int types into pointer types
- problems due to explicit or implicit conversion of constants
into long types
- problems due to explicit or implicit conversion by cast operations of
constants into pointer types
- conflicts with pragma options arch in source files and on the
command line
Compiler Command Line Options
32, 64
