From d4bcee9638cf8fdf7e9297438e70e20b212c6535 Mon Sep 17 00:00:00 2001
From: Tor Hovland <tor.hovland@bekk.no>
Date: Sun, 4 Apr 2021 15:54:21 +0200
Subject: [PATCH] Added a regression test.

---
 src/test/run-make/issue-10971-temps-dir/Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 src/test/run-make/issue-10971-temps-dir/Makefile

diff --git a/src/test/run-make/issue-10971-temps-dir/Makefile b/src/test/run-make/issue-10971-temps-dir/Makefile
new file mode 100644
index 000000000000..d6b35cbfafd6
--- /dev/null
+++ b/src/test/run-make/issue-10971-temps-dir/Makefile
@@ -0,0 +1,10 @@
+include ../../run-make-fulldeps/tools.mk
+
+# Regression test for issue #10971
+# Running two invocations in parallel would overwrite each other's temp files.
+
+all:
+	touch $(TMPDIR)/lib.rs
+
+	$(RUSTC) --crate-type=lib --temps-dir=$(TMPDIR)/temp1 $(TMPDIR)/lib.rs & \
+	$(RUSTC) --crate-type=cdylib --temps-dir=$(TMPDIR)/temp2 $(TMPDIR)/lib.rs