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README.md: Add note that rerun-if-changed is not emitted. #706

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README.md: Add note that rerun-if-changed is not emitted. #706

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6 changes: 6 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@ fn main() {
.file("foo.c")
.file("bar.c")
.compile("foo");
println!("cargo:rerun-if-changed=foo.c");
println!("cargo:rerun-if-changed=bar.c");
}
```

Expand Down Expand Up @@ -101,6 +103,10 @@ functions with hard requirements on some variables supplied by [cargo's
build-script driver][cargo] that it has the `TARGET`, `OUT_DIR`, `OPT_LEVEL`,
and `HOST` variables.

Note that `cc-rs` does not automatically tell cargo to rebuild when the c files
are changed, nor the environment variables such as CFLAGS. See the example to
manually instruct cargo to rebuild when the source files change.

[cargo]: https://doc.rust-lang.org/cargo/reference/build-scripts.html#inputs-to-the-build-script

## Optional features
Expand Down