Add mallopt and related constants for Android

[chriswailes]

Description

This change adds constants that can be passed to BIONIC's implementation of mallopt

Sources

Constant definitions in BIONIC source: https://cs.android.com/android/platform/superproject/main/+/main:bionic/libc/include/malloc.h;l=215

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

Some changes occurred in the Android module

cc @maurer

[tgross35]

Thank you

@rustbot label +stable-nominated

[tgross35]

@chriswailes is this a newer change? It looks like there is a CI failure:

      Running test/main.rs (target/aarch64-linux-android/debug/deps/main-eb05d161ceda646b)
/checkout/target/aarch64-linux-android/debug/deps/main-eb05d161ceda646b: 1 file pushed, 0 skipped. 8.0 MB/s (17585976 bytes in 2.098s)

status: exit status: 134
stdout ---

stderr ---
WARNING: linker: /data/local/tmp/main-eb05d161ceda646b: unsupported flags DT_FLAGS_1=0x8000001
CANNOT LINK EXECUTABLE "/data/local/tmp/main-eb05d161ceda646b": cannot locate symbol "mallopt" referenced by "/data/local/tmp/main-eb05d161ceda646b"...
Aborted 

If this is a newer version than we test with, you can add a skip in libc-test/build.rs.

[chriswailes]

This change is failing presubmit because of the old versions of the emulator and system image used by the CI. I'm working on two possible solutions to this issue:

1. Updating the emulator and system image used by the current CI setup
   • The update is complete but all emulator hangs, preventing any tests from being run
   • The emulator needs to be debugged
2. Re-engineering the Android tests to use Cuttlefish images on the appropriate test hosts to avoid having to use QEMU

It's going to be a week or two until I'm able to put significant time into addressing the issue. If you'd like I can close this pull request and re-open it once the Android test infrastructure is updated.

[tgross35]

If you need the change here sooner, you can also add a skip in libc-test/build.rs and we can merge this.

It would be great to get the Android tests working better though. I don't know enough about it to know what the best solution is, but updates there would be very welcome at any time :)

[chriswailes]

We have a local patch for now and I prefer to not bypass testing when possible. Thanks for offering the flexibility though!

[tgross35]

Given the above,
@rustbot author

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[tgross35]

@chriswailes gentle ping, what would you like to do with this one?