feat(prost-build): emit rerun commands
#1140
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Inform `cargo` about the files and env vars used by `prost-build`. Then `cargo` can better determine when to rebuild a project. - Emit `rerun-if-changed` for each proto file specified - Emit `rerun-if-changed` for each include directory specified - Emit `rerun-if-changed` if `file_descriptor_set_path` is set - Emit `rerun-if-env-changed` for `PROTOC` and `PROTOC_INCLUDE` https://doc.rust-lang.org/cargo/reference/build-scripts.html#rerun-if-changed BREAKING CHANGE: Previously `cargo` assumed it had to rerun `build.rs` if any files in the project changed. `prost-build` will now emit `rerun` commands, which means only the explicitly marked files cause a rerun. If `build.rs` is dependent on any other file paths than those given to `prost-build`, then your `build.rs` needs to emit `rerun` commands as well.
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Inform
cargoabout the files and env vars used byprost-build. Thencargocan better determine when to rebuild a project.rerun-if-changedfor each proto file specifiedrerun-if-changedfor each include directory specifiedrerun-if-changediffile_descriptor_set_pathis setrerun-if-env-changedforPROTOCandPROTOC_INCLUDEhttps://doc.rust-lang.org/cargo/reference/build-scripts.html#rerun-if-changed
BREAKING CHANGE: Previously
cargoassumed it had to rerunbuild.rsif any files in the project changed.prost-buildwill now emitreruncommands, which means only the explicitly marked files cause a rerun. Ifbuild.rsis dependent on any other file paths than those given toprost-build, then yourbuild.rsneeds to emitreruncommands as well.