rust: set STD_ENV_ARCH
In 1.47.0, std::env requires the STD_ENV_ARCH environment variable to be
set to the target architecture [1].
[1] https://github.com/rust-lang/rust/blob/8e8939b8045b7af6076fb718e2e298844aaf4650/library/std/src/env.rs#L866
Bug: 171280890
Test: cd external/rust; mm
Change-Id: If4ddf4b9bad2a1a7518a358a5fb597170a97c67e
diff --git a/rust/builder.go b/rust/builder.go
index 654b1e6..3e082dc 100644
--- a/rust/builder.go
+++ b/rust/builder.go
@@ -22,6 +22,7 @@
"android/soong/android"
"android/soong/cc"
+ "android/soong/rust/config"
)
var (
@@ -138,6 +139,13 @@
crate_name := ctx.RustModule().CrateName()
targetTriple := ctx.toolchain().RustTriple()
+ // libstd requires a specific environment variable to be set. This is
+ // not officially documented and may be removed in the future. See
+ // https://github.com/rust-lang/rust/blob/master/library/std/src/env.rs#L866.
+ if crate_name == "std" {
+ envVars = append(envVars, "STD_ENV_ARCH="+config.StdEnvArch[ctx.RustModule().Arch().ArchType])
+ }
+
inputs = append(inputs, main)
// Collect rustc flags
diff --git a/rust/config/global.go b/rust/config/global.go
index 71c4240..326b85f 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -32,6 +32,15 @@
"libtest",
}
+ // Mapping between Soong internal arch types and std::env constants.
+ // Required as Rust uses aarch64 when Soong uses arm64.
+ StdEnvArch = map[android.ArchType]string{
+ android.Arm: "arm",
+ android.Arm64: "aarch64",
+ android.X86: "x86",
+ android.X86_64: "x86_64",
+ }
+
GlobalRustFlags = []string{
"--remap-path-prefix $$(pwd)=",
"-C codegen-units=1",