-frestrict-args

Purpose

Specifying this option is equivalent to adding the restrict keyword to the pointer parameters within all functions, except that you do not need to modify the source file.

Syntax

Read syntax diagramSkip visual syntax diagram-f norestrict-argsrestrict-args

Default

-fnorestrict-args. It means no function pointer parameters are restricted, unless you specify the restrict attribute in the source file.

Usage

Using this option can improve the performance of your application, but incorrectly asserting this pointer restriction might cause the compiler to generate incorrect code based on the false assumption. If the application works correctly when recompiled without -frestrict-args, the assertion might be false. In this case, do not use this option.

Predefined macro

None.

Example

To compile myprogram.c and instruct the compiler to restrict the pointer access, enter the following command: 

ibm-clang -frestrict-args myprogram.c