Alan Burlison wrote in perl.perl6.internals : > Piers Cawley wrote: > >> Small Perl task for the interested >> Want to get involved in the Parrot development process? Don't know much >> about Virtual Machine design and implementation? Do know Perl? Dan has a >> small but interesting task for you. >> >> At present, Parrot gets built without any compiler level optimizations >> turned on because files like tsq.c can't have any optimizations turned >> on (tsq.c is the thread safe queue module, which is "annoyingly >> execution-order-dependent because it has to operate safely as interrupt >> code potentially interrupting itself"). >> >> Dan would like a version of Configure.pl which can build a makefile (or >> whatever build tool we end up using) with per-C-file compiler flags, and >> it needs to be possible to override those flags, per file, by the >> platform configuration module. > > Hmm, I'm only a lurker, but that looks *very* suspect to me. Some compilers > may choose to reorder even without optimization turned on. I'd say that it > is a bug in Parrot if it requires optimization to be off for this code - how > many different compilers have you tried?
That doesn't make this per-C-file-cc-option-tweaking necessarily unuseful. Perl 5 uses something similar, because the lexer is sometimes miscompiled when some compilers with a high optimization level. Example : see the hints files and lookup "XXX_cflags" or "toke_cflags" in hints/README.hints.
