Build `armv7-linux-androideabi` failed with latest nightly rustc.

[Wyvern]

Rust nightly build with -Zbuild-std option for armv7-linux-androideabi failed with error like below:

error[: the name `_inner_slow_integer_to_str` is defined multiple times
   --> /rustc/855e0fe46e68d94e9f6147531b75ac2d488c548e/library/core/src/fmt/num.rs:415:9
    |
415 |           fn _inner_slow_integer_to_str(mut n: $u, buf: &mut [MaybeUninit::<u8>]) -> usize {
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |           |
    |           `_inner_slow_integer_to_str` redefined here
    |           previous definition of the value `_inner_slow_integer_to_str` here
...
643 | /     impl_Display!(
644 | |         i8, u8,
645 | |         i16, u16,
646 | |         i32, u32,
647 | |         isize, usize,
648 | |         ; as u32 via to_u32 named fmt_u32);
    | |__________________________________________- in this macro invocation
    |
    = note: `_inner_slow_integer_to_str` must be defined only once in the value namespace of this module
    = note: this error originates in the macro `impl_Display` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0428`.
error: could not compile `core` (lib) due to 1 previous error

[workingjubilee]

That is a tier 2 std target. It should always be possible to build it, because we build its artifacts for distribution. Are you using something else with std, like an additional cfg?

[workingjubilee]

I believe you are, and that this is a duplicate with #143804

We do not test that feature to keep it working, nor formally support it.