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342 lines
9.6 KiB
Text
342 lines
9.6 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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# 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_rust_ldflags` 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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# `rust_bin_ldflags`: Used for rust_executable targets.
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# `rust_test_ldflags`: 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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dummy_rs_path = rebase_path("dummy.rs", root_build_dir)
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rust_bin_ldflags =
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exec_script("get_rust_ldflags.py", [ dummy_rs_path ], "list lines")
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rust_test_ldflags = exec_script("get_rust_ldflags.py",
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[
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dummy_rs_path,
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"--test",
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],
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"list lines")
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template("run_rustc") {
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action(target_name) {
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assert(defined(invoker.source_root), "Must specify source_root")
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forward_variables_from(invoker,
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[
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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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"extern_infos",
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"features",
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"is_test",
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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(is_test)) {
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is_test = false
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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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sources = [
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source_root,
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]
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script = "//tools/run_rustc.py"
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args = [
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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=$crate_type",
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]
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if (treat_warnings_as_errors) {
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args += [ "-Dwarnings" ]
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}
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if (!is_win) {
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args += [ "--color=always" ]
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}
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if (!defined(crate_version)) {
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crate_name_and_version = crate_name
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} else {
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crate_name_and_version = "$crate_name-$crate_version"
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}
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if (crate_type == "bin") {
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output_file = "$out_dir/$crate_name_and_version.o"
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emit_type = "obj"
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} else if (crate_type == "rlib") {
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output_file = "$out_dir/lib$crate_name_and_version.rlib"
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emit_type = "link"
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}
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outputs = [
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output_file,
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]
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output_file_rel = rebase_path(output_file, root_build_dir)
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args += [ "--emit=$emit_type=$output_file_rel" ]
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depfile = "$out_dir/$crate_name_and_version.d"
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args += [
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"--emit=dep-info=" + rebase_path(depfile, root_build_dir),
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# The following two args are used by run_rustc.py to fix
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# the depfile on the fly. They are not passed thru to rustc.
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"--depfile=" + rebase_path(depfile, root_build_dir),
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"--output_file=" + output_file_rel,
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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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]
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if (defined(crate_version)) {
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# Compute the sha256sum of the version number. See comments below.
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# Note that we do this only if there are multiple versions of this crate.
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hash = exec_script("//tools/sha256sum.py",
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[
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"--input",
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crate_version,
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"--format",
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"%.8s",
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],
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"trim string")
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args += [
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# In our build setup, all crates are built in the same directory. The
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# actual build outputs have unique names (e.g. 'foo-1.2.3.rlib'), but
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# rustc also creates many temp files (e.g. 'foo.crate.metadata.rcgu.bc',
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# 'foo.foo0.rcgu.o'), and with those files, name collisions do occur.
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# This causes random failures during parallel builds and on CI.
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#
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# These name conflicts can be avoided by setting `-C extra-filename=` to
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# some unique value. Unfortunately the version number as such can't be
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# used: everything after the first dot (.) is thrown away, so winapi-0.2
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# vs. winapi-0.3 would still have conflicts -- so we use a hash instead.
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"-C",
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"extra-filename=$hash",
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# Rustc blows up if a target (directly or indirectly) depends on two+
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# crates that have the same name *and* the same metadata. So we use the
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# hash to give 'metadata' a unique value too (any unique value will do).
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"-C",
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"metadata=$hash",
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]
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}
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if (is_debug) {
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args += [ "-g" ]
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}
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if (is_official_build) {
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args += [ "-O" ]
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}
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if (is_test) {
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args += [ "--test" ]
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}
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if (defined(features)) {
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foreach(f, features) {
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args += [
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"--cfg",
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"feature=\"" + f + "\"",
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]
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}
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}
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if (defined(invoker.args)) {
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args += invoker.args
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}
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if (!defined(deps)) {
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deps = []
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}
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inputs = []
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# Build the list of '--extern' arguments from the 'extern_infos' array.
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foreach(info, extern_infos) {
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rlib = "$out_dir/lib${info.crate_name_and_version}.rlib"
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args += [
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"--extern",
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info.crate_name + "=" + rebase_path(rlib, root_build_dir),
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]
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inputs += [ rlib ]
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deps += [
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"${info.label}_rustc",
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info.label,
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]
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}
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}
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}
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template("rust_crate") {
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rustc_name = target_name + "_rustc"
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rustc_label = ":" + rustc_name
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config_name = target_name + "_config"
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# Convert all 'extern' and 'extern_version' items to a single format.
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extern_infos = []
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if (defined(invoker.extern)) {
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foreach(label, invoker.extern) {
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extern_infos += [
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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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crate_name_and_version = crate_name
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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_infos += [
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{
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forward_variables_from(info,
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[
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"label",
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"crate_name",
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"crate_version",
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])
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crate_name_and_version = "$crate_name-$crate_version"
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},
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]
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}
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}
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forward_variables_from(invoker,
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[
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"crate_name",
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"crate_type",
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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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run_rustc(rustc_name) {
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forward_variables_from(invoker,
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[
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"args",
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"crate_version",
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"deps",
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"features",
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"is_test",
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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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}
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crate_outputs = get_target_outputs(rustc_label)
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crate_obj = crate_outputs[0]
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config(config_name) {
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lib_dirs = []
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forward_variables_from(invoker, [ "libs" ])
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if (!defined(libs)) {
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libs = []
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}
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foreach(info, extern_infos) {
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rlib = "$out_dir/lib${info.crate_name_and_version}.rlib"
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libs += [ rlib ]
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}
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lib_dirs = [ out_dir ]
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}
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source_set(target_name) {
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forward_variables_from(invoker,
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[
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"deps",
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"libs",
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"testonly",
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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(libs)) {
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libs = []
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}
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libs += [ crate_obj ]
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deps += [ rustc_label ]
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all_dependent_configs = [ ":" + config_name ]
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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 = rust_test_ldflags
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} else {
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ldflags = rust_bin_ldflags
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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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