Chapter Contents

Sharing extern Variables among Load Modules

Cautions

The following cautions should be noted in sharing extern variables among load modules:

To ensure that the compiler creates a pseudoregister for global extern variables even if the norent option is in effect, declare the variable __rent , or use an underscore as the first character of the identifier.
Names of extern variables that differ only in case are treated as identical. extern identifiers that differ only after the first eight characters are treated as identical.
External identifiers beginning with two underscores or a single underscore followed by an uppercase character are reserved for the implementation, according to the ANSI Standard.
The default list must not be changed, either in number or order. Such a change prevents the library from operating correctly and will probably cause an abend.
The default list may change from release to release as necessary.
If the L$UGLBL list is modified, all non-C-library load modules that have been linked with the list must be relinked with the modified version.
L$UGLBL is not supported in SPE.

For more information about external identifiers, refer to External Variables.

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