[bug #57751] Improve POSIX support for SCCS

[Jörg Schilling]

Follow-up Comment #7, bug #57751 (project make):

Just a note to the XSI "enhancements" to POSIX....

Implementing all XSI enhancements is required in order to get the permission
to call a platform "UNIX" compatible and thus to use the UNIX trademark.

A platform that implements support for XSI is a full blown POSIX system and if
XSI is not or not completely implemented, this is typical choice for tiny
platforms, e.g. embedded systems.

BTW: SunPro Make is POSIX+XSI certified and gmake is not faster than SunPro
Make. Gmake even needs a tiny bit more CPU time than SunPro Make. So I am not
sure whether implementing SCCS support really creates a performance problem.

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