From 31aa7c1a5d8a27c720b6255dc3eceda3707b1826 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Fri, 9 Aug 2019 09:58:34 +0200
Subject: build: support rust crates that generate sources in their build
 script

---
 build_extra/rust/rust.gni | 14 +++++++++++++-
 1 file changed, 13 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 787888bc2..ba8cc781f 100644
--- a/build_extra/rust/rust.gni
+++ b/build_extra/rust/rust.gni
@@ -62,8 +62,9 @@ template("_rust_crate") {
                            "crate_version",
                            "deps",
                            "edition",
-                           "inputs",
                            "features",
+                           "generated_source_dir",
+                           "inputs",
                            "is_test",
                            "libs",
                            "source_root",
@@ -237,6 +238,17 @@ template("_rust_crate") {
       "--color=always",
     ]
 
+    if (defined(generated_source_dir)) {
+      args += [
+        # Some crates (e.g. 'typenum') generate source files and place them in
+        # the directory indicated by the 'OUT_DIR' environment variable, which
+        # is normally set by Cargo. This flag tells run.py to set 'OUT_DIR' to
+        # the path where the current crate can find its generated sources.
+        "--generated-source-dir=" +
+            rebase_path(generated_source_dir, root_build_dir),
+      ]
+    }
+
     if (defined(crate_version)) {
       args += [
         # This is used to set env variables for Cargo build compatibility
-- 
cgit v1.2.3