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Diffstat (limited to '')
| -rw-r--r-- | cortex-m-rt/src/lib.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/cortex-m-rt/src/lib.rs b/cortex-m-rt/src/lib.rs index 08037d2..13f41f4 100644 --- a/cortex-m-rt/src/lib.rs +++ b/cortex-m-rt/src/lib.rs @@ -689,6 +689,14 @@ pub use macros::exception; /// [rfc1414]: https://github.com/rust-lang/rfcs/blob/master/text/1414-rvalue_static_promotion.md pub use macros::pre_init; +// We export this static with an informative name so that if an application attempts to link +// two copies of cortex-m-rt together, linking will fail. We also declare a links key in +// Cargo.toml which is the more modern way to solve the same problem, but we have to keep +// __ONCE__ around to prevent linking with versions before the links key was added. +#[export_name = "error: cortex-m-rt appears more than once in the dependency graph"] +#[doc(hidden)] +pub static __ONCE__: () = (); + /// Registers stacked (pushed onto the stack) during an exception. #[derive(Clone, Copy)] #[repr(C)] |