Merge #433

433: Change CI to build with Rust 1.32 and document that as MSRV r=reitermarkus a=adamgreig

This PR adds a documented MSRV, per rust-embedded/wg#445

As far as I can tell none of the Azure pipelines use Xargo or nightly Rust, so I think this small change should be sufficient, but we'll see what CI makes of it.

Co-authored-by: Adam Greig <[email protected]>

Author: bors[bot]

README.md

@@ -327,6 +327,14 @@ $ QEMU_STRACE=1 cross run --target aarch64-unknown-linux-gnu
   work because `cross` use docker containers only mounts the Cargo project so
   the container doesn't have access to the rest of the filesystem.
 
+## Minimum Supported Rust Version (MSRV)
+
+This crate is guaranteed to compile on stable Rust 1.42.0 and up. It *might*
+compile with older versions but that may change in any new patch release.
+
+Some cross-compilation targets require a later Rust version, and using Xargo
+requires a nightly Rust toolchain.
+
 ## License
 
 Licensed under either of

azure-pipelines.yml

@@ -14,7 +14,7 @@ jobs:
       vmImage: $(VM_IMAGE)
     variables:
       VM_IMAGE: ubuntu-latest
-      TOOLCHAIN: stable
+      TOOLCHAIN: 1.42.0
       CARGO_NET_RETRY: 3
       CARGO_HTTP_CHECK_REVOKE: false
     strategy: