Allow opting out of cc toolchain for cargo_build_script - #3679
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This change introduces `use_cc_toolchain` to `cargo_build_script` which can be used to control whether or not a `cc_toolchain` is explicitly withheld from `CargoBuildScript` actions. Additionally a global flag `--@rules_rust//cargo/settings:use_cc_toolchain` can be used to control the default of any build script that has not either explicitly set `use_cc_toolchain = 1` (always include cc toolchains) or `use_cc_toolchain = 0` (always exclude cc toolchains). closes bazelbuild/rules_rust#3680 closes bazelbuild/rules_rust#3679 Co-authored-by: Krasimir Georgiev <krasimir@google.com>
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With a hermetic cc toolchain + sysroot, the
cc_toolchain.all_filescan be quite a lot of a files to add to the spawn inputs. Our monorepo shows around 15% of global analysis time spent onctx.actions.runofcargo_build_scriptdue to these inputs. This PR gives us a switch to remove the toolchain from build scripts that don't intend to use it, while keeping backwards-compatibility.