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Just no.
Precompilation is a fine idea. Automatic precompilation is an OK idea.
Automatic precompilation the user can't turn off is a horrible, dirty,
broken idea.
The no precompilation pragma is fine, and it should exist, but there needs
to be a process-wide means of, at run time and at rakudo's build-time:
* Not use any precompilation at all.
* Not build any new precompilation files unless told to explicitly, but
to use what's already there.
* Customise where exactly precompilation files are put.
And while you're at it, failing to create precompilation files - eg. on a
read-only filesystem - should never under any circumstances be a failure
(except when instructed by a user to create precompilation files*). This
should never happen:
===SORRY!===
Failed to create directory '/home/mking/src/sad/.precomp' with mode
'0o777': Failed to mkdir: 13
Or this, when I touched .precomp as a file rather than a directory:
===SORRY!===
Earlier failure:
Failed to open file /home/mking/src/sad/.precomp/.lock: not a directory
in any at
/home/mking/Applications/Rakudo/share/perl6/runtime/CORE.setting.moarvm
line 1
in any load_module at src/Perl6/World.nqp line 975
in any do_pragma_or_load_module at src/Perl6/World.nqp line 907
in any loading_and_symbol_setup at src/Perl6/World.nqp line 391
in any comp_unit at src/Perl6/Grammar.nqp line 1138
in any TOP at src/Perl6/Grammar.nqp line 441
Final error:
Type check failed in assignment to $!lock; expected IO::Handle but got
Failure
Both could prehaps elicit a warning though, unless told not to.
In short:
* precompilation is a cache. If a cache fails the application should
_ALWAYS_ continue on, albeit uncached, and there should be a means of
silencing cache errors.
* Automatic anything should always be overridable by the user, ideally
temporarily _and_ permanently.
Matthew
[*] There is an exception to every rule, except this one.
