compile error for v2.0.0-alpha.7 when cargo install

[manxiaqu]

I got the following error on Ubuntu 16.04 when running cargo install node-cli --git https://github.com/paritytech/substrate.git --tag v2.0.0-alpha.7 --force

 error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
  --> client/executor/wasmtime/src/instance_wrapper/globals_snapshot.rs:41:16
   |
41 |         let handle = instance_wrapper.instance.handle().clone();
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
   |
   = note: consult the function's documentation for information on how to avoid undefined behavior

error: aborting due to previous error

For more information about this error, try `rustc --explain E0133`.
error: could not compile `sc-executor-wasmtime`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: failed to compile `node-cli v2.0.0-alpha.7 (https://github.com/paritytech/substrate.git?tag=v2.0.0-alpha.7#83a6f1ad)`, intermediate artifacts can be found at `/tmp/cargo-installw8jYhT`

Caused by:
  build failed

and

  Compiling sp-arithmetic v2.0.0-alpha.6 (/home/ubuntu/.cargo/git/checkouts/substrate-7e08433d4c370a21/67f354f/primitives/arithmetic)
error: this operation will panic at runtime
   --> /home/ubuntu/.cargo/git/checkouts/substrate-7e08433d4c370a21/67f354f/primitives/arithmetic/src/fixed64.rs:155:32
    |
155 |             return Fixed64::from_parts( self.0 / zero);
    |                                         ^^^^^^^^^^^^^ attempt to divide by zero
    |
    = note: `#[deny(unconditional_panic)]` on by default

error: aborting due to previous error

error: could not compile `sp-arithmetic`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

warning: build failed, waiting for other jobs to finish...
error: failed to compile `node-cli v2.0.0-alpha.6 (https://github.com/paritytech/substrate.git?tag=v2.0.0-alpha.6#67f354f5)`, intermediate artifacts can be found at `/tmp/cargo-installcq1Q8V`

Caused by:
  build failed

by runningcargo install node-cli --git https://github.com/paritytech/substrate.git --tag v2.0.0-alpha.6 --force

The error in v2.0.0-alpha.6 is fixed by #5844 somehow.

env:

rustup 1.21.1 (7832b2ebe 2019-12-20)
rustc 1.43.1 (8d69840ab 2020-05-04)
cargo 1.43.0 (2cbe9048e 2020-05-03)
Linux ubuntu-XPS-13-9360 4.15.0-46-generic #49~16.04.1-Ubuntu SMP Tue Feb 12 17:45:24 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[araa47]

I get the same error on my mac, have tried rusts c 1.43.1 and also 1.42.0

active toolchain
----------------

1.42.0-x86_64-apple-darwin (default)
rustc 1.42.0 (b8cedc004 2020-03-09)

[arseneeth]

Having the same issue, got here from the substrate-contracts-workshop tutorial and the previous build issue: #5837

env:

rustup 1.21.1 (7832b2ebe 2019-12-20)
rustc 1.43.1 (8d69840ab 2020-05-04)
cargo 1.43.0 (2cbe9048e 2020-05-03)
elementary OS 5.1.2 Hera

[bkchr]

Both errors require a new alpha. We already have fixes for the stuff in master. Sorry!