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289 lines
7.9 KiB
Text
289 lines
7.9 KiB
Text
declare_args() {
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# Absolute path of rust build files.
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rust_build = "//build_extra/rust/"
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# Wrapper executable for rustc invocations. This can be used for a caching
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# utility, e.g. sccache.
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rustc_wrapper = ""
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# treat the warnings in rust files as errors
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rust_treat_warnings_as_errors = true
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}
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if (is_win) {
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executable_suffix = ".exe"
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} else {
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executable_suffix = ""
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}
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# To simplify transitive dependency management with gn, we build all rust
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# crates into the same directory. We need to be careful not to have crates
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# with the same name.
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out_dir = "$root_out_dir/rust_crates"
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# The official way of building Rust executables is to to let rustc do the
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# linking. However, we'd prefer to leave it in the hands of gn/ninja:
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# * It allows us to use source sets.
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# * It allows us to use the bundled lld that Chromium and V8 use.
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# * We have more control over build flags.
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# * To sidestep rustc weirdness (e.g. on Windows, it always links with the
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# release C runtime library, even for debug builds).
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#
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# The `get_rustc_info` tool outputs the linker flags that are needed to
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# successfully link rustc object code into an executable.
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# We generate two sets of ldflags:
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# `ldflags_bin` : Used for rust_executable targets.
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# `ldflags_test`: Used for rust_test targets; includes the test harness.
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#
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# The tool works by compiling and linking something with rustc, and analyzing
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# the arguments it passes to the system linker. That's what dummy.rs is for.
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_rustc_info = exec_script("get_rustc_info.py", [], "json")
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template("rust_crate") {
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config_name = "${target_name}_config"
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action_name = "${target_name}_rustc"
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forward_variables_from(invoker,
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[
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"cfg",
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"crate_name",
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"crate_type",
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"crate_version",
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"deps",
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"inputs",
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"features",
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"is_test",
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"libs",
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"source_root",
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"testonly",
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"treat_warnings_as_errors",
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])
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if (!defined(crate_name)) {
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crate_name = target_name
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}
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if (!defined(crate_type)) {
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crate_type = "rlib"
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}
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if (!defined(deps)) {
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deps = []
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}
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if (!defined(is_test)) {
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is_test = false
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}
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if (!defined(libs)) {
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libs = []
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}
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if (!defined(treat_warnings_as_errors)) {
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# Use global setting if not explicitly specified for this target.
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treat_warnings_as_errors = rust_treat_warnings_as_errors
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}
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if (defined(crate_version)) {
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# In our build setup, all crates are built in the same directory. To avoid
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# file name conflicts between when multiple versions of the same crate are
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# built, add a unique suffix to output file names.
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# Unfortunately the version number as such can't be used directly:
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# everything after the first dot (.) is thrown away by rust, so in case of
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# foo-0.2 vs foo-0.3 only the first '0' would be used, and conflicts would
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# still occur. Therefore we use a hash of the version number instead.
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crate_suffix = exec_script("//tools/sha256sum.py",
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[
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"--input=$crate_version",
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"--format=-%.8s",
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],
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"trim string")
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} else {
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# Of most crates we use only one version; no need for all this difficulty.
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crate_suffix = ""
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}
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# Derive filenames for 'extern' and 'extern_version' linked rust libraries.
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extern_rlibs = []
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if (defined(invoker.extern)) {
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foreach(label, invoker.extern) {
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extern_rlibs += [
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{
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label = label
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crate_name = get_label_info(label, "name")
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rlib = "$out_dir/lib$crate_name.rlib"
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},
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]
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}
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}
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if (defined(invoker.extern_version)) {
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foreach(info, invoker.extern_version) {
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extern_rlibs += [
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{
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crate_name = info.crate_name
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crate_version = info.crate_version
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crate_suffix = exec_script("//tools/sha256sum.py",
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[
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"--input=$crate_version",
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"--format=-%.8s",
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],
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"trim string")
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label = ":$crate_name-$crate_version"
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rlib = "$out_dir/lib$crate_name$crate_suffix.rlib"
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},
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]
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}
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}
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config(config_name) {
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foreach(extern, extern_rlibs) {
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libs += [ extern.rlib ]
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}
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lib_dirs = [ out_dir ]
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}
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if (crate_type == "bin") {
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rustc_output = "$out_dir/$crate_name$crate_suffix.o"
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emit_type = "obj"
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} else if (crate_type == "rlib") {
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rustc_output = "$out_dir/lib$crate_name$crate_suffix.rlib"
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emit_type = "link"
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}
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source_set(target_name) {
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public_deps = [
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":$action_name",
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]
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libs += [ rustc_output ]
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all_dependent_configs = [ ":$config_name" ]
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}
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action(action_name) {
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script = "//build_extra/rust/run.py"
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sources = [
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source_root,
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]
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outputs = [
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rustc_output,
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]
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depfile = "$out_dir/$crate_name$crate_suffix.d"
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if (rustc_wrapper != "") {
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args = [ rustc_wrapper ]
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} else {
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args = []
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}
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args += [
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"rustc",
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rebase_path(source_root, root_build_dir),
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"--crate-name=$crate_name",
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"--crate-type=$crate_type",
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"--emit=$emit_type,dep-info",
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"--out-dir=" + rebase_path(out_dir, root_build_dir),
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# This is to disambiguate multiple versions of the same crate.
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"-Cextra-filename=$crate_suffix",
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# Appending the rustc version to the crate metadata ensures that they are
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# rebuilt when rustc is upgraded, by changing the command line.
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"-Cmetadata=\"${crate_suffix}_${_rustc_info.version}\"",
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# This is needed for transitive dependencies.
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"-L",
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"dependency=" + rebase_path(out_dir, root_build_dir),
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# Use colorful output even if stdout is redirected and not a tty.
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"--color=always",
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]
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if (defined(crate_version)) {
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args += [
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# This is used to set env variables for Cargo build compatibility
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"--cargo-pkg-version=$crate_version",
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]
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}
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if (is_debug) {
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args += [ "-g" ]
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}
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if (is_official_build) {
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args += [ "-O" ]
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}
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if (is_test) {
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args += [ "--test" ]
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}
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if (treat_warnings_as_errors) {
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args += [ "-Dwarnings" ]
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}
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if (defined(invoker.args)) {
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args += invoker.args
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}
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if (defined(cfg)) {
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foreach(c, cfg) {
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args += [
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"--cfg",
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"c",
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]
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}
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}
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if (defined(features)) {
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foreach(f, features) {
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args += [
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"--cfg",
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"feature=\"" + f + "\"",
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]
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}
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}
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# Build the list of '--extern' arguments from the 'extern_rlibs' array.
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foreach(extern, extern_rlibs) {
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args += [
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"--extern",
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extern.crate_name + "=" + rebase_path(extern.rlib, root_build_dir),
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]
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sources += [ extern.rlib ]
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deps += [ extern.label ]
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}
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}
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}
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template("rust_executable") {
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bin_name = target_name + "_bin"
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bin_label = ":" + bin_name
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rust_crate(bin_name) {
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crate_type = "bin"
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forward_variables_from(invoker, "*")
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}
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executable(target_name) {
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forward_variables_from(invoker, "*")
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if (defined(is_test) && is_test) {
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ldflags = _rustc_info.ldflags_test
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} else {
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ldflags = _rustc_info.ldflags_bin
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}
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if (!defined(deps)) {
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deps = []
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}
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deps += [ bin_label ]
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if (defined(extern)) {
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deps += extern
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}
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if (defined(extern_version)) {
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foreach(info, extern_version) {
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deps += [ info.label ]
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}
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}
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}
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}
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template("rust_test") {
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rust_executable(target_name) {
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forward_variables_from(invoker, "*")
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is_test = true
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testonly = true
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}
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}
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