[Bug translator/4281] two problems with "stap -m"

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From dsmith at redhat dot com  2007-03-26 19:07 -------
The reason why the use of '-m' disables the cache is that we do cache lookups
based on filenames.  The hash of the compile environment, systemtap options, and
pass 2 output becomes the module name and filename.  If we can find that
filename in the cache directory, we reuse it.

Let's say you run "stap -m foo script1.stp" and we somehow cache the result. 
Then you run "stap -m foo script2.stp" - obviously you don't want the cached
result, but we'd have no way of knowing that.

We could theoretically rename the module filename to its hash name when storing
it in the cache, but then you couldn't use the module directly from the cache -
you'd have to know to rename it back to the original '-m' name.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4281

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