Add Rust support to Soong.
Adds support to Soong for building rust modules. This currently only
supports x86_64 device and x86 linux host targets. The functionality
is sufficient to build crosvm.
Bug: 136189233
Test: Test module builds.
Test: crosvm builds.
Change-Id: I6ea04615834a6d673578ab10ea1a2eb04259fe09
diff --git a/rust/builder.go b/rust/builder.go
new file mode 100644
index 0000000..64e387b
--- /dev/null
+++ b/rust/builder.go
@@ -0,0 +1,132 @@
+// Copyright 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rust
+
+import (
+ "strings"
+
+ "github.com/google/blueprint"
+
+ "android/soong/android"
+)
+
+var (
+ _ = pctx.SourcePathVariable("rustcCmd", "${config.RustBin}/rustc")
+ rustc = pctx.AndroidStaticRule("rustc",
+ blueprint.RuleParams{
+ Command: "$rustcCmd " +
+ "-C linker=${config.RustLinker} " +
+ "-C link-args=\"${config.RustLinkerArgs} ${linkFlags}\" " +
+ "-o $out $in ${libFlags} $rustcFlags " +
+ "&& $rustcCmd --emit=dep-info -o $out.d $in ${libFlags} $rustcFlags",
+ CommandDeps: []string{"$rustcCmd"},
+ Depfile: "$out.d",
+ Deps: blueprint.DepsGCC, // Rustc deps-info writes out make compatible dep files: https://github.com/rust-lang/rust/issues/7633
+ },
+ "rustcFlags", "linkFlags", "libFlags")
+)
+
+func init() {
+
+}
+
+func TransformSrcToBinary(ctx android.ModuleContext, mainSrc android.Path, deps PathDeps, flags Flags, outputFile android.WritablePath, includeDirs []string) {
+ targetTriple := ctx.(ModuleContext).toolchain().RustTriple()
+
+ transformSrctoCrate(ctx, mainSrc, deps.RLibs, deps.DyLibs, deps.ProcMacros, deps.StaticLibs, deps.SharedLibs, flags, outputFile, "bin", includeDirs, targetTriple)
+}
+
+func TransformSrctoRlib(ctx android.ModuleContext, mainSrc android.Path, deps PathDeps, flags Flags, outputFile android.WritablePath, includeDirs []string) {
+ targetTriple := ctx.(ModuleContext).toolchain().RustTriple()
+
+ transformSrctoCrate(ctx, mainSrc, deps.RLibs, deps.DyLibs, deps.ProcMacros, deps.StaticLibs, deps.SharedLibs, flags, outputFile, "rlib", includeDirs, targetTriple)
+}
+
+func TransformSrctoDylib(ctx android.ModuleContext, mainSrc android.Path, deps PathDeps, flags Flags, outputFile android.WritablePath, includeDirs []string) {
+ targetTriple := ctx.(ModuleContext).toolchain().RustTriple()
+
+ transformSrctoCrate(ctx, mainSrc, deps.RLibs, deps.DyLibs, deps.ProcMacros, deps.StaticLibs, deps.SharedLibs, flags, outputFile, "dylib", includeDirs, targetTriple)
+}
+
+func TransformSrctoProcMacro(ctx android.ModuleContext, mainSrc android.Path, deps PathDeps, flags Flags, outputFile android.WritablePath, includeDirs []string) {
+ // Proc macros are compiler plugins, and thus should target the host compiler
+ targetTriple := ""
+
+ transformSrctoCrate(ctx, mainSrc, deps.RLibs, deps.DyLibs, deps.ProcMacros, deps.StaticLibs, deps.SharedLibs, flags, outputFile, "proc-macro", includeDirs, targetTriple)
+}
+
+func rustLibsToPaths(libs RustLibraries) android.Paths {
+ var paths android.Paths
+ for _, lib := range libs {
+ paths = append(paths, lib.Path)
+ }
+ return paths
+}
+
+func transformSrctoCrate(ctx android.ModuleContext, main android.Path,
+ rlibs, dylibs, proc_macros RustLibraries, static_libs, shared_libs android.Paths, flags Flags, outputFile android.WritablePath, crate_type string, includeDirs []string, targetTriple string) {
+
+ var inputs android.Paths
+ var deps android.Paths
+ var libFlags, rustcFlags []string
+ crate_name := ctx.(ModuleContext).CrateName()
+
+ inputs = append(inputs, main)
+
+ // Collect rustc flags
+ rustcFlags = append(rustcFlags, flags.GlobalFlags...)
+ rustcFlags = append(rustcFlags, flags.RustFlags...)
+ rustcFlags = append(rustcFlags, "--crate-type="+crate_type)
+ rustcFlags = append(rustcFlags, "--crate-name="+crate_name)
+ if targetTriple != "" {
+ rustcFlags = append(rustcFlags, "--target="+targetTriple)
+ }
+
+ // Collect library/crate flags
+ for _, lib := range rlibs {
+ libFlags = append(libFlags, "--extern "+lib.CrateName+"="+lib.Path.String())
+ }
+ for _, lib := range dylibs {
+ libFlags = append(libFlags, "--extern "+lib.CrateName+"="+lib.Path.String())
+ }
+ for _, proc_macro := range proc_macros {
+ libFlags = append(libFlags, "--extern "+proc_macro.CrateName+"="+proc_macro.Path.String())
+ }
+
+ for _, path := range includeDirs {
+ libFlags = append(libFlags, "-L "+path)
+ }
+
+ // Collect dependencies
+ deps = append(deps, rustLibsToPaths(rlibs)...)
+ deps = append(deps, rustLibsToPaths(dylibs)...)
+ deps = append(deps, rustLibsToPaths(proc_macros)...)
+ deps = append(deps, static_libs...)
+ deps = append(deps, shared_libs...)
+
+ ctx.Build(pctx, android.BuildParams{
+ Rule: rustc,
+ Description: "rustc " + main.Rel(),
+ Output: outputFile,
+ Inputs: inputs,
+ Implicits: deps,
+ Args: map[string]string{
+ "rustcFlags": strings.Join(rustcFlags, " "),
+ "linkFlags": strings.Join(flags.LinkFlags, " "),
+ "libFlags": strings.Join(libFlags, " "),
+ },
+ })
+
+}