From 47e8242b2912e36535ed2194de75b10802f230b1 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Tue, 25 Sep 2018 18:45:09 -0700
Subject: build: add support for rustc_wrapper

Fixes #690.
---
 build_extra/rust/rust.gni | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'build_extra/rust/rust.gni')

diff --git a/build_extra/rust/rust.gni b/build_extra/rust/rust.gni
index 94f7acbe9..dc9c408d2 100644
--- a/build_extra/rust/rust.gni
+++ b/build_extra/rust/rust.gni
@@ -2,6 +2,10 @@ declare_args() {
   # Absolute path of rust build files.
   rust_build = "//build_extra/rust/"
 
+  # Wrapper executable for rustc invocations. This can be used for a caching
+  # utility, e.g. sccache.
+  rustc_wrapper = ""
+
   # treat the warnings in rust files as errors
   rust_treat_warnings_as_errors = true
 }
@@ -114,7 +118,13 @@ template("run_rustc") {
     ]
     depfile = "$out_dir/$crate_name$crate_suffix.d"
 
-    args = [
+    if (rustc_wrapper != "") {
+      args = [ rustc_wrapper ]
+    } else {
+      args = []
+    }
+
+    args += [
       "rustc",
       rebase_path(source_root, root_build_dir),
       "--crate-name=$crate_name",
-- 
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