[PATCH] D120540: [Driver] Enable to use C++20 modules standalone by -fcxx-modules

[Iain Sandoe via Phabricator via cfe-commits]

iains added a comment.

as noted before, IMO this is all a bit tangled at the moment.

Probably, a good start would be to make the driver and the FE behave the same way for the flags -- at the moment C++20 jams on fmodules and fcxx-modules (meaning that there's no way to decouple them in the FE) - however the driver still recognises them as distinct.

AFAIU, we all agree that the end game should be that we can clearly define which flags are relevant to each "modules mode" .. but we're some way away from that , and trying to move in small steps that does not  break stuff.

I see tests that have stuff like -fmodules -fmodule-ts .. but I am not sure what "modules mode" that really means? (and some combinations are actually not really doing anything, because of the jamming  on from c++20)

sorry .. this is not in any way a solution - but more a statement that the problem is quite knotty.


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https://reviews.llvm.org/D120540