warn64

Syntax

    -qwarn64

Purpose
Enables checking for possible long-to-integer truncation.

Notes
All generated messages have level Informational.

This 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 into 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

Specifying Compiler Options for Architecture-Specific, 32- or 64-bit Compilation

Acceptable Compiler Mode and Processor Architecture Combinations
List of Batch Compiler Options and Their Defaults
Options that Define the Compiler Object Code Produced
longlit Batch Compiler Option
Equivalent Batch Compile-Link and Incremental Build Options