List of Compiler Options and Their Defaults
Options that Specify Debugging Features
#pragma disjoint Preprocessor Directive
#pragma isolated_call Preprocessor Directive
| Option Type | Default Value | #pragma options | C | C++ |
| -qoption | - | IGNPRAG=suboption | x | x |
Syntax
-qignprag=suboption
IGNPRAG=suboption
Purpose
Instructs the compiler to ignore the disjoint
and/or isolated_call
pragmas.
Notes
Suboptions are:
| disjoint | Ignores all #pragma disjoint directives in the source file. |
| isolated | Ignores all #pragma isolated_call directives in the source file. |
| all | Ignores all #pragma isolated_call and #pragma disjoint directives in the source file. |
This option is useful for detecting aliasing pragma errors. Incorrect aliasing gives runtime errors that are hard to diagnose. When a runtime error occurs, but the error disappears when you use -qignprag with the -O option, the information specified in the aliasing pragmas is likely incorrect.
Example
To compile myprogram.c and ignore any #pragma
isolated directives, enter:
xlC myprogram.c -qignprag=isolated
List of Compiler Options and Their
Defaults
Options that Specify Debugging Features
#pragma disjoint
Preprocessor Directive
#pragma isolated_call
Preprocessor Directive
