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compiler-builtins-zynq
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mention that 'extern crate compiler_builtins' must be used 

in some crate that's part of the dependency graph of the crate one's
building.
This commit is contained in:
Jorge Aparicio 2016-10-19 11:19:06 -05:00
parent 600ed3b36e
commit 39b7fa2267
1 changed files with 14 additions and 6 deletions
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README.md
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@ -11,18 +11,26 @@ See [rust-lang/rust#35437][0].
## When and how to use this crate?
If you are working with a target that doesn't have binary releases of std available via rustup (this
probably means you are building the core crate yourself) and need compiler-rt intrinsics (i.e. you
are probably getting linker errors when building an executable: `undefined reference to
__aeabi_memcpy`), you can use this crate to get those intrinsics and solve the linker errors. To do
that, simply add this crate as a Cargo dependency (it doesn't matter where in the dependency graph
this crate ends up, as long as it's there):
If you are working with a target that doesn't have binary releases of std
available via rustup (this probably means you are building the core crate
yourself) and need compiler-rt intrinsics (i.e. you are probably getting linker
errors when building an executable: `undefined reference to __aeabi_memcpy`),
you can use this crate to get those intrinsics and solve the linker errors. To
do that, add this crate somewhere in the dependency graph of the crate you are
building:
``` toml
# Cargo.toml
[dependencies]
compiler_builtins = { git = "https://github.com/rust-lang-nursery/compiler-builtins" }
```
``` rust
extern crate compiler_builtins;
// ...
```
If you still get an "undefined reference to $INTRINSIC" error after that change,
that means that we haven't ported `$INTRINSIC` to Rust yet! Please open [an
issue] with the name of the intrinsic and the LLVM triple (e.g.