Does not compiles with target-feature=-sse2

[tower120]

When I trying to compile num-traits with

[build]
rustflags = ["-Ctarget-feature=-sse2"] 

I get:

   Compiling num-traits v0.2.15
error: src\lib.rs:386:0: in function _ZN39_$LT$f64$u20$as$u20$num_traits..Num$GT$14from_str_radix17h59b1ae50b18378abE void (ptr, ptr, i64, i32): SSE2 register return with SSE2 disable

[CryZe]

You can't turn off sse2 like that because std is pre-compiled with sse2. Look into using the i586 target(s) instead.

[tower120]

That's not that I'm trying to disable sse2 specifically for num-traits....

So, sse2 required for num-traits? Does that means it can't be used with arm/mac?
If so - that should be mentioned somewhere in the docs.

[tower120]

You can't turn off sse2 like that because std is pre-compiled with sse2

Oh I lost std word, first time I read that.

https://docs.rs/safe_arch/latest/safe_arch/#compile-time-cpu-target-features

Now I see that.