Android segfaults for API level <18

[sanxiyn]

See #9120 for details. Probably related to how the logging system is initialized from the crate map using a weak symbol.

[alexcrichton]

I think that #9593 will start to hide the problem because it'll start handling when the symbol is NULL, but this is still a problem in that the reason it's NULL to begin with needs to be investigated.

[sanxiyn]

I have posted a question to android-ndk regarding Android and weak symbol.

[flaper87]

Triage bump. @alexcrichton @sanxiyn Do you know if this is still happening? Based on the gate, it doesn't look like but I don't have a good way to prove it.

@sanxiyn re weak symbols, some work started here #12556 by adding support for linkage flavors

[alexcrichton]

This does indeed appear to be working now, our android bot is definitely running tests with logging and crate maps. This has likely been fixed in the meantime.

Closing, but if this still reproduces, feel free to reopen!