Immediate crash when avx cpu feature is enabled when calling glfw::init in release mode

[daemonjax]

Immediate crash when avx cpu feature is enabled when calling glfw::init:
the line: let mut glfw = glfw::init(glfw::FAIL_ON_ERRORS.clone()).unwrap();

error: process didn't exit successfully: z:/rust_target\release\binary.exe (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)

cpu: ivybridge (3570k)
target: stable-x86_64-pc-windows-msvc (default)
rustc version: rustc 1.42.0 (b8cedc004 2020-03-09)

[profile.release]
opt-level = 3
debug = false
debug-assertions = false
overflow-checks = false
lto = true
panic = 'abort'
incremental = false
codegen-units = 1

This is as close as I can get to cpu native before it crashes (e.g. the following runs fine unless i add avx, or set it to native or ivybridge):
rustflags = "-C target-cpu=x86-64 -C target-feature=+mmx,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+aes,+clflushopt,+cmov,+cx16,+cx8,+ermsb,+fxsr,+mwaitx,+popcnt,+fsgsbase,+rdrnd"

Also, opt-level = 1 will not crash with avx cpu feature enabled.

I don't understand what avx has to do with grabbing an opengl context. Weird.

[daemonjax]

Nevermind I guess.
It magically started working (even simply using target-cpu=native or ivybridge). The only thing I changed is adding more code to the project. Coinflip odds on it hanging (0% cpu usage) when building glfw-sys with +avx -- I just ctrl-c and rerun "cargo build --release" and it then builds fine. No idea why.

Can close this out.