Disallow multiple esp-hal-common versions (#934)

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - C2, C3: atomic emulation trap is now opt-in (#904)
 - Improve DMA documentation & clean up module (#915)
+- Only allow a single version of `esp-hal-common` to be present in an application (#934)
 
 ### Fixed
 

esp-hal-common/Cargo.toml

@@ -11,6 +11,13 @@ description  = "HAL implementations for peripherals common among Espressif devic
 repository   = "https://github.com/esp-rs/esp-hal"
 license      = "MIT OR Apache-2.0"
 
+# Prevent multiple copies of this crate in the same binary.
+# Needed because different copies might get different features, causing
+# confusing build errors due to expected features not getting enabled
+# on the unintentional copy.
+# This is especially common when mixing crates from crates.io and git.
+links = "esp-hal-common"
+
 [dependencies]
 bitflags             = "2.4.1"
 bitfield             = "0.14.0"