errno_name

Tells the optimizer how to find the errno identifier.

Syntax

#pragma errno_name id | ...

Remarks

When this pragma is used, the optimizer can use the identifier errno (either a macro or a function call) to optimize standard C library functions better. If not used, the optimizer makes worst-case assumptions about the effects of calls to the standard C library.

Note: The MSL C library already includes a use of this pragma, so you would only need to use it for third-party C libraries.

If errno resolves to a variable name, specify it like this:

#pragma errno_name _Errno

If errno is a function call accessing ordinarily inaccessible global variables, use this form:

#pragma errno_name ...

Otherwise, do not use this pragma to prevent incorrect optimizations.

This pragma does not correspond to any panel setting. By default, this pragma is unspecified (worst case assumption).