Developer Guide and Reference

Contents

ansi-alias, Qansi-alias

Enables or disables the use of ANSI aliasing rules in optimizations.

Syntax

Linux:
-ansi-alias
-no-ansi-alias
macOS:
-ansi-alias
-no-ansi-alias
Windows:
/Qansi-alias
/Qansi-alias-
Arguments
None
Default
Windows* systems:
/Qansi-alias
-
ANSI aliasing rules are disabled in optimizations.
Linux* and
macOS*
systems:
-ansi-alias
ANSI aliasing rules are enabled in optimizations.
Description
This option tells the compiler to assume that the program adheres to ISO C Standard aliasability rules.
If your program adheres to the ANSI aliasability rules, this option allows the compiler to optimize more aggressively. If your program does not adhere to these rules, this option may cause the compiler to generate incorrect code.
If you are compiling on a Linux* or an
macOS*
system and your program does not adhere to the ANSI aliasability rules, you can specify
-no-ansi-alias
to ensure program correctness.
When you specify the
[Q]ansi-alias
option, the ansi-alias checker is enabled by default. To disable the ansi-alias checker, you must specify
-no-ansi-alias-check
(Linux* and
macOS*
) or
/Qansi-alias-check-
(Windows*).