Thoughts on how to add `--rustopts`

[GregBowyer]

Hi all,

rightly? probably wrongly our current build configuration lets developers opt into using the sanitizers via bazelrc configurations.

One of these configurations abuses --copt to add -fsanitize=address to the cflags we compile under, as a result we get asan binaries.

I think I can make this happen with platforms / toolchains in the rust_rules, but it might be good to still think about how and if there is a way to specify flags for rustc in a more adhoc fashion.

Not urgent more a discussion point.

[mfarrugi]

I don't quite follow, do you mean that we should support something different than (or in addition to) the rustc_flags parameter supported by the rules?

[hlopko]

This doc (once finished) describes our plans with the Skylark rules and bazel options: https://docs.google.com/document/d/1vc8v-kXjvgZOdQdnxPTaV0rrLxtP2XwnD2tAZlYJOqw/edit#heading=h.pn8nbhno42p5. Up until then there's not much we can do here (except hacks using --define or similar).

[UebelAndre]

@hlopko do you know if there was a recent PR that solved for this? I vaguely remember something that seemed relevant. Will do some more digging later

[hlopko]

I think you meant #566?

[UebelAndre]

Looks like this was resolved by #566 closing out.