Wt

Add the weak link attribute "attribute((weak))" to the functions createTempFileName() and getTempDir(). This will allow the functions to be replaced during link with application defined functions.
The use case is to provide a way to substitute a temporary file manager to manage the creation and segregation of temporary files.

1. In a multi-tenant server each tenant could get a segregated temporary directory. This would prevent 'mixing' of temporary files between tenants.
2. Allows application defined life/duration for temporary files.
3. Allows application defined uniqueness criteria to be applied for temporary file names.
4. Allows application defined ownership criteria to be applied to temporary files.

Note, some of the above can achieved by stealing the spool files. But it is not really desirable to have to start moving large files between directories. While this "should" be a cheap function call to just rewrite the path, in some prospective use cases it could result in a file copy. (Multi-tenant with tenants sitting on different physical disks)

Alternatives would be to create a mechanism to substitute the function calls at runtime. This would likely be more flexible, but more work to implement.