| """Rules for Cargo build scripts (`build.rs` files)""" |
| |
| load("@bazel_skylib//lib:paths.bzl", "paths") |
| load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo") |
| load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain") |
| load("@rules_cc//cc:action_names.bzl", "ACTION_NAMES") |
| load("//rust:defs.bzl", "rust_common") |
| load("//rust:rust_common.bzl", "BuildInfo") |
| |
| # buildifier: disable=bzl-visibility |
| load( |
| "//rust/private:rustc.bzl", |
| "get_compilation_mode_opts", |
| "get_linker_and_args", |
| ) |
| |
| # buildifier: disable=bzl-visibility |
| load( |
| "//rust/private:utils.bzl", |
| "dedent", |
| "expand_dict_value_locations", |
| "find_cc_toolchain", |
| "find_toolchain", |
| _name_to_crate_name = "name_to_crate_name", |
| ) |
| |
| # Reexport for cargo_build_script_wrapper.bzl |
| name_to_crate_name = _name_to_crate_name |
| |
| CargoBuildScriptRunfilesInfo = provider( |
| doc = "Info about a `cargo_build_script.script` target.", |
| fields = { |
| "data": "List[Target]: The raw `cargo_build_script_runfiles.data` attribute.", |
| "tools": "List[Target]: The raw `cargo_build_script_runfiles.tools` attribute.", |
| }, |
| ) |
| |
| def _cargo_build_script_runfiles_impl(ctx): |
| script = ctx.executable.script |
| |
| is_windows = script.extension == "exe" |
| exe = ctx.actions.declare_file("{}{}".format(ctx.label.name, ".exe" if is_windows else "")) |
| |
| # Avoid the following issue on Windows when using builds-without-the-bytes. |
| # https://github.com/bazelbuild/bazel/issues/21747 |
| if is_windows: |
| args = ctx.actions.args() |
| args.add(script) |
| args.add(exe) |
| |
| ctx.actions.run( |
| executable = ctx.executable._copy_file, |
| arguments = [args], |
| inputs = [script], |
| outputs = [exe], |
| ) |
| else: |
| ctx.actions.symlink( |
| output = exe, |
| target_file = script, |
| is_executable = True, |
| ) |
| |
| # Tools are ommitted here because they should be within the `script` |
| # attribute's runfiles. |
| runfiles = ctx.runfiles(files = ctx.files.data) |
| |
| return [ |
| DefaultInfo( |
| files = depset([exe]), |
| runfiles = runfiles.merge(ctx.attr.script[DefaultInfo].default_runfiles), |
| executable = exe, |
| ), |
| CargoBuildScriptRunfilesInfo( |
| data = ctx.attr.data, |
| tools = ctx.attr.tools, |
| ), |
| ] |
| |
| cargo_build_script_runfiles = rule( |
| doc = """\ |
| A rule for producing `cargo_build_script.script` with proper runfiles. |
| |
| This rule ensure's the executable for `cargo_build_script` has properly formed runfiles with `cfg=target` and |
| `cfg=exec` files. This is a challenge becuase had the script binary been directly consumed, it would have been |
| in either configuration which would have been incorrect for either the `tools` (exec) or `data` (target) attributes. |
| This is solved here by consuming the script as exec and creating a symlink to consumers of this rule can consume |
| with `cfg=target` and still get an exec compatible binary. |
| |
| This rule may not be necessary if it becomes possible to construct runfiles trees within a rule for an action as |
| we'd be able to build the correct runfiles tree and configure the script runner to run the script in the new runfiles |
| directory: |
| https://github.com/bazelbuild/bazel/issues/15486 |
| """, |
| implementation = _cargo_build_script_runfiles_impl, |
| attrs = { |
| "data": attr.label_list( |
| doc = "Data required by the build script.", |
| allow_files = True, |
| ), |
| "script": attr.label( |
| doc = "The binary script to run, generally a `rust_binary` target.", |
| executable = True, |
| mandatory = True, |
| providers = [rust_common.crate_info], |
| cfg = "exec", |
| ), |
| "tools": attr.label_list( |
| doc = "Tools required by the build script.", |
| allow_files = True, |
| cfg = "exec", |
| ), |
| "_copy_file": attr.label( |
| cfg = "exec", |
| executable = True, |
| default = Label("//cargo/private:copy_file"), |
| ), |
| }, |
| executable = True, |
| ) |
| |
| def get_cc_compile_args_and_env(cc_toolchain, feature_configuration): |
| """Gather cc environment variables from the given `cc_toolchain` |
| |
| Args: |
| cc_toolchain (cc_toolchain): The current rule's `cc_toolchain`. |
| feature_configuration (FeatureConfiguration): Class used to construct command lines from CROSSTOOL features. |
| |
| Returns: |
| tuple: A tuple of the following items: |
| - (sequence): A flattened C command line flags for given action. |
| - (sequence): A flattened CXX command line flags for given action. |
| - (dict): C environment variables to be set for given action. |
| """ |
| compile_variables = cc_common.create_compile_variables( |
| feature_configuration = feature_configuration, |
| cc_toolchain = cc_toolchain, |
| ) |
| cc_c_args = cc_common.get_memory_inefficient_command_line( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.c_compile, |
| variables = compile_variables, |
| ) |
| cc_cxx_args = cc_common.get_memory_inefficient_command_line( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.cpp_compile, |
| variables = compile_variables, |
| ) |
| cc_env = cc_common.get_environment_variables( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.c_compile, |
| variables = compile_variables, |
| ) |
| return cc_c_args, cc_cxx_args, cc_env |
| |
| def _pwd_flags_sysroot(args): |
| """Prefix execroot-relative paths of known arguments with ${pwd}. |
| |
| Args: |
| args (list): List of tool arguments. |
| |
| Returns: |
| list: The modified argument list. |
| """ |
| res = [] |
| for arg in args: |
| s, opt, path = arg.partition("--sysroot=") |
| if s == "" and not paths.is_absolute(path): |
| res.append("{}${{pwd}}/{}".format(opt, path)) |
| else: |
| res.append(arg) |
| return res |
| |
| def _pwd_flags_isystem(args): |
| """Prefix execroot-relative paths of known arguments with ${pwd}. |
| |
| Args: |
| args (list): List of tool arguments. |
| |
| Returns: |
| list: The modified argument list. |
| """ |
| res = [] |
| fix_next_arg = False |
| for arg in args: |
| if fix_next_arg and not paths.is_absolute(arg): |
| res.append("${{pwd}}/{}".format(arg)) |
| else: |
| res.append(arg) |
| |
| fix_next_arg = arg == "-isystem" |
| |
| return res |
| |
| def _pwd_flags_fsanitize_ignorelist(args): |
| """Prefix execroot-relative paths of known arguments with ${pwd}. |
| |
| Args: |
| args (list): List of tool arguments. |
| |
| Returns: |
| list: The modified argument list. |
| """ |
| res = [] |
| for arg in args: |
| s, opt, path = arg.partition("-fsanitize-ignorelist=") |
| if s == "" and not paths.is_absolute(path): |
| res.append("{}${{pwd}}/{}".format(opt, path)) |
| else: |
| res.append(arg) |
| return res |
| |
| def _pwd_flags(args): |
| return _pwd_flags_fsanitize_ignorelist(_pwd_flags_isystem(_pwd_flags_sysroot(args))) |
| |
| def _feature_enabled(ctx, feature_name, default = False): |
| """Check if a feature is enabled. |
| |
| If the feature is explicitly enabled or disabled, return accordingly. |
| |
| In the case where the feature is not explicitly enabled or disabled, return the default value. |
| |
| Args: |
| ctx: The context object. |
| feature_name: The name of the feature. |
| default: The default value to return if the feature is not explicitly enabled or disabled. |
| |
| Returns: |
| Boolean defining whether the feature is enabled. |
| """ |
| if feature_name in ctx.disabled_features: |
| return False |
| |
| if feature_name in ctx.features: |
| return True |
| |
| return default |
| |
| def _rlocationpath(file, workspace_name): |
| if file.short_path.startswith("../"): |
| return file.short_path[len("../"):] |
| |
| return "{}/{}".format(workspace_name, file.short_path) |
| |
| def _create_runfiles_dir(ctx, script, retain_list): |
| """Create a runfiles directory to represent `CARGO_MANIFEST_DIR`. |
| |
| Due to the inability to forcibly generate runfiles directories for use as inputs |
| to actions, this function creates a custom runfiles directory that can more |
| consistently be relied upon as an input. For more details see: |
| https://github.com/bazelbuild/bazel/issues/15486 |
| |
| If runfiles directories can ever be more directly treated as an input this function |
| can be retired. |
| |
| Args: |
| ctx (ctx): The rule's context object |
| script (Target): The `cargo_build_script.script` target. |
| retain_list (list): A list of strings to keep in generated runfiles directories. |
| |
| Returns: |
| Tuple[File, Depset[File], Args]: |
| - The output directory to be created. |
| - Runfile inputs needed by the action. |
| - The args required to create the directory. |
| """ |
| runfiles_dir = ctx.actions.declare_directory("{}.cargo_runfiles".format(ctx.label.name)) |
| |
| # External repos always fall into the `../` branch of `_rlocationpath`. |
| workspace_name = ctx.workspace_name |
| |
| def _runfiles_map(file): |
| return "{}={}".format(file.path, _rlocationpath(file, workspace_name)) |
| |
| runfiles = script[DefaultInfo].default_runfiles |
| |
| args = ctx.actions.args() |
| args.use_param_file("--cargo_manifest_args=@%s", use_always = True) |
| args.add(runfiles_dir.path) |
| args.add(",".join(retain_list)) |
| args.add_all(runfiles.files, map_each = _runfiles_map, allow_closure = True) |
| |
| return runfiles_dir, runfiles.files, args |
| |
| def _cargo_build_script_impl(ctx): |
| """The implementation for the `cargo_build_script` rule. |
| |
| Args: |
| ctx (ctx): The rules context object |
| |
| Returns: |
| list: A list containing a BuildInfo provider |
| """ |
| script = ctx.executable.script |
| script_info = ctx.attr.script[CargoBuildScriptRunfilesInfo] |
| toolchain = find_toolchain(ctx) |
| out_dir = ctx.actions.declare_directory(ctx.label.name + ".out_dir") |
| env_out = ctx.actions.declare_file(ctx.label.name + ".env") |
| dep_env_out = ctx.actions.declare_file(ctx.label.name + ".depenv") |
| flags_out = ctx.actions.declare_file(ctx.label.name + ".flags") |
| link_flags = ctx.actions.declare_file(ctx.label.name + ".linkflags") |
| link_search_paths = ctx.actions.declare_file(ctx.label.name + ".linksearchpaths") # rustc-link-search, propagated from transitive dependencies |
| compilation_mode_opt_level = get_compilation_mode_opts(ctx, toolchain).opt_level |
| |
| script_tools = [] |
| script_data = [] |
| for target in script_info.data: |
| script_data.append(target[DefaultInfo].files) |
| script_data.append(target[DefaultInfo].default_runfiles.files) |
| for target in script_info.tools: |
| script_tools.append(target[DefaultInfo].files) |
| script_tools.append(target[DefaultInfo].default_runfiles.files) |
| |
| workspace_name = ctx.label.workspace_name |
| if not workspace_name: |
| workspace_name = ctx.workspace_name |
| |
| extra_args = [] |
| extra_inputs = [] |
| extra_output = [] |
| |
| # Relying on runfiles directories is unreliable when passing data to |
| # dependent actions. Instead, an explicit directory should be created |
| # until more reliable functionality is implemented in Bazel: |
| # https://github.com/bazelbuild/bazel/issues/15486 |
| incompatible_runfiles_cargo_manifest_dir = ctx.attr._incompatible_runfiles_cargo_manifest_dir[BuildSettingInfo].value |
| if not incompatible_runfiles_cargo_manifest_dir: |
| script_data.append(ctx.attr.script[DefaultInfo].default_runfiles.files) |
| manifest_dir = "{}.runfiles/{}/{}".format(script.path, workspace_name, ctx.label.package) |
| else: |
| runfiles_dir, runfiles_inputs, runfiles_args = _create_runfiles_dir( |
| ctx = ctx, |
| script = ctx.attr.script, |
| retain_list = ctx.attr._cargo_manifest_dir_filename_suffixes_to_retain[BuildSettingInfo].value, |
| ) |
| manifest_dir = "{}/{}/{}".format(runfiles_dir.path, workspace_name, ctx.label.package) |
| extra_args.append(runfiles_args) |
| extra_inputs.append(runfiles_inputs) |
| extra_output = [runfiles_dir] |
| |
| pkg_name = ctx.attr.pkg_name |
| if pkg_name == "": |
| pkg_name = name_to_pkg_name(ctx.label.name) |
| |
| toolchain_tools = [toolchain.all_files] |
| |
| cc_toolchain = find_cpp_toolchain(ctx) |
| |
| # Start with the default shell env, which contains any --action_env |
| # settings passed in on the command line. |
| env = dict(ctx.configuration.default_shell_env) |
| |
| env.update({ |
| "CARGO_CRATE_NAME": name_to_crate_name(pkg_name), |
| "CARGO_MANIFEST_DIR": manifest_dir, |
| "CARGO_PKG_NAME": pkg_name, |
| "HOST": toolchain.exec_triple.str, |
| "NUM_JOBS": "1", |
| "OPT_LEVEL": compilation_mode_opt_level, |
| "RUSTC": toolchain.rustc.path, |
| "TARGET": toolchain.target_flag_value, |
| # OUT_DIR is set by the runner itself, rather than on the action. |
| }) |
| |
| # This isn't exactly right, but Bazel doesn't have exact views of "debug" and "release", so... |
| env.update({ |
| "DEBUG": {"dbg": "true", "fastbuild": "true", "opt": "false"}.get(ctx.var["COMPILATION_MODE"], "true"), |
| "PROFILE": {"dbg": "debug", "fastbuild": "debug", "opt": "release"}.get(ctx.var["COMPILATION_MODE"], "unknown"), |
| }) |
| |
| if ctx.attr.version: |
| version = ctx.attr.version.split("+")[0].split(".") |
| patch = version[2].split("-") if len(version) > 2 else [""] |
| env["CARGO_PKG_VERSION_MAJOR"] = version[0] |
| env["CARGO_PKG_VERSION_MINOR"] = version[1] if len(version) > 1 else "" |
| env["CARGO_PKG_VERSION_PATCH"] = patch[0] |
| env["CARGO_PKG_VERSION_PRE"] = patch[1] if len(patch) > 1 else "" |
| env["CARGO_PKG_VERSION"] = ctx.attr.version |
| |
| # Pull in env vars which may be required for the cc_toolchain to work (e.g. on OSX, the SDK version). |
| # We hope that the linker env is sufficient for the whole cc_toolchain. |
| cc_toolchain, feature_configuration = find_cc_toolchain(ctx) |
| linker, link_args, linker_env = get_linker_and_args(ctx, "bin", cc_toolchain, feature_configuration, None) |
| env.update(**linker_env) |
| env["LD"] = linker |
| env["LDFLAGS"] = " ".join(_pwd_flags(link_args)) |
| |
| # MSVC requires INCLUDE to be set |
| cc_c_args, cc_cxx_args, cc_env = get_cc_compile_args_and_env(cc_toolchain, feature_configuration) |
| include = cc_env.get("INCLUDE") |
| if include: |
| env["INCLUDE"] = include |
| |
| if cc_toolchain: |
| toolchain_tools.append(cc_toolchain.all_files) |
| |
| env["CC"] = cc_common.get_tool_for_action( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.c_compile, |
| ) |
| env["CXX"] = cc_common.get_tool_for_action( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.cpp_compile, |
| ) |
| env["AR"] = cc_common.get_tool_for_action( |
| feature_configuration = feature_configuration, |
| action_name = ACTION_NAMES.cpp_link_static_library, |
| ) |
| |
| # Populate CFLAGS and CXXFLAGS that cc-rs relies on when building from source, in particular |
| # to determine the deployment target when building for apple platforms (`macosx-version-min` |
| # for example, itself derived from the `macos_minimum_os` Bazel argument). |
| env["CFLAGS"] = " ".join(_pwd_flags(cc_c_args)) |
| env["CXXFLAGS"] = " ".join(_pwd_flags(cc_cxx_args)) |
| |
| # Inform build scripts of rustc flags |
| # https://github.com/rust-lang/cargo/issues/9600 |
| env["CARGO_ENCODED_RUSTFLAGS"] = "\\x1f".join([ |
| # Allow build scripts to locate the generated sysroot |
| "--sysroot=${{pwd}}/{}".format(toolchain.sysroot), |
| ] + ctx.attr.rustc_flags) |
| |
| for f in ctx.attr.crate_features: |
| env["CARGO_FEATURE_" + f.upper().replace("-", "_")] = "1" |
| |
| links = ctx.attr.links or "" |
| if links: |
| env["CARGO_MANIFEST_LINKS"] = links |
| |
| # Add environment variables from the Rust toolchain. |
| env.update(toolchain.env) |
| |
| known_variables = {} |
| |
| # Gather data from the `toolchains` attribute. |
| for target in ctx.attr.toolchains: |
| if DefaultInfo in target: |
| toolchain_tools.extend([ |
| target[DefaultInfo].files, |
| target[DefaultInfo].default_runfiles.files, |
| ]) |
| if platform_common.ToolchainInfo in target: |
| all_files = getattr(target[platform_common.ToolchainInfo], "all_files", depset([])) |
| if type(all_files) == "list": |
| all_files = depset(all_files) |
| toolchain_tools.append(all_files) |
| if platform_common.TemplateVariableInfo in target: |
| variables = getattr(target[platform_common.TemplateVariableInfo], "variables", depset([])) |
| known_variables.update(variables) |
| |
| _merge_env_dict(env, expand_dict_value_locations( |
| ctx, |
| ctx.attr.build_script_env, |
| getattr(ctx.attr, "data", []) + |
| getattr(ctx.attr, "compile_data", []) + |
| getattr(ctx.attr, "tools", []) + |
| script_info.data + |
| script_info.tools, |
| known_variables, |
| )) |
| |
| tools = depset( |
| direct = [ |
| script, |
| ctx.executable._cargo_build_script_runner, |
| ] + ([toolchain.target_json] if toolchain.target_json else []), |
| transitive = script_data + script_tools + toolchain_tools, |
| ) |
| |
| # dep_env_file contains additional environment variables coming from |
| # direct dependency sys-crates' build scripts. These need to be made |
| # available to the current crate build script. |
| # See https://doc.rust-lang.org/cargo/reference/build-scripts.html#-sys-packages |
| # for details. |
| args = ctx.actions.args() |
| args.add(script, format = "--script=%s") |
| args.add(links, format = "--links=%s") |
| args.add(out_dir.path, format = "--out_dir=%s") |
| args.add(env_out, format = "--env_out=%s") |
| args.add(flags_out, format = "--flags_out=%s") |
| args.add(link_flags, format = "--link_flags=%s") |
| args.add(link_search_paths, format = "--link_search_paths=%s") |
| args.add(dep_env_out, format = "--dep_env_out=%s") |
| args.add(ctx.attr.rundir, format = "--rundir=%s") |
| |
| output_groups = { |
| "out_dir": depset([out_dir]), |
| } |
| |
| debug_std_streams_output_group = ctx.attr._debug_std_streams_output_group[BuildSettingInfo].value |
| if debug_std_streams_output_group: |
| debug_stdout = ctx.actions.declare_file(ctx.label.name + ".stdout.log") |
| debug_stderr = ctx.actions.declare_file(ctx.label.name + ".stderr.log") |
| args.add(debug_stdout, format = "--stdout=%s") |
| args.add(debug_stderr, format = "--stderr=%s") |
| extra_output.append(debug_stdout) |
| extra_output.append(debug_stderr) |
| output_groups["streams"] = depset([debug_stdout, debug_stderr]) |
| |
| build_script_inputs = [] |
| |
| for dep in ctx.attr.link_deps: |
| if rust_common.dep_info in dep and dep[rust_common.dep_info].dep_env: |
| dep_env_file = dep[rust_common.dep_info].dep_env |
| args.add(dep_env_file.path, format = "--input_dep_env_path=%s") |
| build_script_inputs.append(dep_env_file) |
| for dep_build_info in dep[rust_common.dep_info].transitive_build_infos.to_list(): |
| build_script_inputs.append(dep_build_info.out_dir) |
| |
| for dep in ctx.attr.deps: |
| for dep_build_info in dep[rust_common.dep_info].transitive_build_infos.to_list(): |
| build_script_inputs.append(dep_build_info.out_dir) |
| |
| experimental_symlink_execroot = ctx.attr._experimental_symlink_execroot[BuildSettingInfo].value or \ |
| _feature_enabled(ctx, "symlink-exec-root") |
| |
| if experimental_symlink_execroot: |
| env["RULES_RUST_SYMLINK_EXEC_ROOT"] = "1" |
| |
| ctx.actions.run( |
| executable = ctx.executable._cargo_build_script_runner, |
| arguments = [args] + extra_args, |
| outputs = [ |
| out_dir, |
| env_out, |
| flags_out, |
| link_flags, |
| link_search_paths, |
| dep_env_out, |
| ] + extra_output, |
| tools = tools, |
| inputs = depset(build_script_inputs, transitive = extra_inputs), |
| mnemonic = "CargoBuildScriptRun", |
| progress_message = "Running Cargo build script {}".format(pkg_name), |
| env = env, |
| toolchain = None, |
| # Set use_default_shell_env so that $PATH is set, as tools like Cmake |
| # may want to probe $PATH for helper tools. |
| use_default_shell_env = True, |
| ) |
| |
| return [ |
| # Although this isn't used anywhere, without this, `bazel build`'ing |
| # the cargo_build_script label won't actually run the build script |
| # since bazel is lazy. |
| DefaultInfo(files = depset([out_dir])), |
| BuildInfo( |
| out_dir = out_dir, |
| rustc_env = env_out, |
| dep_env = dep_env_out, |
| flags = flags_out, |
| linker_flags = link_flags, |
| link_search_paths = link_search_paths, |
| compile_data = depset(extra_output, transitive = script_data), |
| ), |
| OutputGroupInfo( |
| **output_groups |
| ), |
| ] |
| |
| cargo_build_script = rule( |
| doc = ( |
| "A rule for running a crate's `build.rs` files to generate build information " + |
| "which is then used to determine how to compile said crate." |
| ), |
| implementation = _cargo_build_script_impl, |
| attrs = { |
| "build_script_env": attr.string_dict( |
| doc = "Environment variables for build scripts.", |
| ), |
| "crate_features": attr.string_list( |
| doc = "The list of rust features that the build script should consider activated.", |
| ), |
| "deps": attr.label_list( |
| doc = "The Rust build-dependencies of the crate", |
| providers = [rust_common.dep_info], |
| cfg = "exec", |
| ), |
| "link_deps": attr.label_list( |
| doc = dedent("""\ |
| The subset of the Rust (normal) dependencies of the crate that |
| have the links attribute and therefore provide environment |
| variables to this build script. |
| """), |
| providers = [rust_common.dep_info], |
| ), |
| "links": attr.string( |
| doc = "The name of the native library this crate links against.", |
| ), |
| "pkg_name": attr.string( |
| doc = "The name of package being compiled, if not derived from `name`.", |
| ), |
| "rundir": attr.string( |
| default = "", |
| doc = dedent("""\ |
| A directory to cd to before the cargo_build_script is run. |
| |
| This should be a pathrelative to the exec root. The default behaviour (and the |
| behaviour if rundir is set to the empty string) is to change to the relative |
| path corresponding to the cargo manifest directory, which replicates the |
| normal behaviour of cargo so it is easy to write compatible build scripts. |
| |
| If set to `.`, the cargo build script will run in the exec root. |
| """), |
| ), |
| "rustc_flags": attr.string_list( |
| doc = dedent("""\ |
| List of compiler flags passed to `rustc`. |
| |
| These strings are subject to Make variable expansion for predefined |
| source/output path variables like `$location`, `$execpath`, and |
| `$rootpath`. This expansion is useful if you wish to pass a generated |
| file of arguments to rustc: `@$(location //package:target)`. |
| """), |
| ), |
| "script": attr.label( |
| doc = "The binary script to run, generally a `rust_binary` target.", |
| executable = True, |
| mandatory = True, |
| cfg = "target", |
| providers = [CargoBuildScriptRunfilesInfo], |
| ), |
| "tools": attr.label_list( |
| doc = "Tools required by the build script.", |
| allow_files = True, |
| cfg = "exec", |
| ), |
| "version": attr.string( |
| doc = "The semantic version (semver) of the crate", |
| ), |
| "_cargo_build_script_runner": attr.label( |
| executable = True, |
| allow_files = True, |
| default = Label("//cargo/cargo_build_script_runner:cargo_build_script_runner"), |
| cfg = "exec", |
| ), |
| "_cargo_manifest_dir_filename_suffixes_to_retain": attr.label( |
| default = Label("//cargo/settings:cargo_manifest_dir_filename_suffixes_to_retain"), |
| ), |
| "_cc_toolchain": attr.label( |
| default = Label("@bazel_tools//tools/cpp:current_cc_toolchain"), |
| ), |
| "_debug_std_streams_output_group": attr.label( |
| default = Label("//cargo/settings:debug_std_streams_output_group"), |
| ), |
| "_experimental_symlink_execroot": attr.label( |
| default = Label("//cargo/settings:experimental_symlink_execroot"), |
| ), |
| "_incompatible_runfiles_cargo_manifest_dir": attr.label( |
| default = Label("//cargo/settings:incompatible_runfiles_cargo_manifest_dir"), |
| ), |
| }, |
| fragments = ["cpp"], |
| toolchains = [ |
| str(Label("//rust:toolchain_type")), |
| "@bazel_tools//tools/cpp:toolchain_type", |
| ], |
| ) |
| |
| def _merge_env_dict(prefix_dict, suffix_dict): |
| """Merges suffix_dict into prefix_dict, appending rather than replacing certain env vars.""" |
| for key in ["CFLAGS", "CXXFLAGS", "LDFLAGS"]: |
| if key in prefix_dict and key in suffix_dict and prefix_dict[key]: |
| prefix_dict[key] += " " + suffix_dict.pop(key) |
| prefix_dict.update(suffix_dict) |
| |
| def name_to_pkg_name(name): |
| """Sanitize the name of cargo_build_script targets. |
| |
| Args: |
| name (str): The name value pass to the `cargo_build_script` wrapper. |
| |
| Returns: |
| str: A cleaned up name for a build script target. |
| """ |
| if name.endswith("_bs"): |
| return name[:-len("_bs")] |
| return name |
