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pyo3-build-config: rebuild when PYO3_ENVIRONMENT_SIGNATURE value changed #2727

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Nov 10, 2022
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pyo3-build-config: rebuild when PYO3_ENVIRONMENT_SIGNATURE value changed #2727

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2 changes: 2 additions & 0 deletions guide/src/building_and_distribution.md
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Expand Up @@ -45,6 +45,8 @@ Caused by:
suppress_build_script_link_lines=false
```

The `PYO3_ENVIRONMENT_SIGNATURE` environment variable can be used to trigger rebuilds when its value changes, it has no other effect.

### Advanced: config files

If you save the above output config from `PYO3_PRINT_CONFIG` to a file, it is possible to manually override the contents and feed it back into PyO3 using the `PYO3_CONFIG_FILE` env var.
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1 change: 1 addition & 0 deletions newsfragments/2727.added.md
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@@ -0,0 +1 @@
`pyo3-build-config`: rebuild when `PYO3_ENVIRONMENT_SIGNATURE` environment variable value changed
4 changes: 4 additions & 0 deletions pyo3-build-config/src/impl_.rs
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Expand Up @@ -1684,6 +1684,10 @@ fn get_env_interpreter() -> Option<PathBuf> {
/// 3. `python`, if this is functional a Python 3.x interpreter
/// 4. `python3`, as above
pub fn find_interpreter() -> Result<PathBuf> {
// Trigger rebuilds when `PYO3_ENVIRONMENT_SIGNATURE` env var value changes
// See https://github.com/PyO3/pyo3/issues/2724
println!("cargo:rerun-if-env-changed=PYO3_ENVIRONMENT_SIGNATURE");

if let Some(exe) = env_var("PYO3_PYTHON") {
Ok(exe.into())
} else if let Some(env_interpreter) = get_env_interpreter() {
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