From 144a87cd4c0e7347b6d620ee71804a22a4b57b04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= <motiejus@uber.com>
Date: Wed, 4 Aug 2021 15:16:18 +0300
Subject: [PATCH] flock zig toolchain

slower, but more robust.
---
 toolchain/defs.bzl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/toolchain/defs.bzl b/toolchain/defs.bzl
index 8131128..1e81d75 100644
--- a/toolchain/defs.bzl
+++ b/toolchain/defs.bzl
@@ -163,7 +163,9 @@ else
 fi
 export ZIG_LOCAL_CACHE_DIR="$cache_prefix/bazel-zig-cc"
 export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
-exec "{zig}" "{zig_tool}" "$@"
+
+# https://github.com/ziglang/zig/issues/9431
+exec flock "{zig}" "{zig}" "{zig_tool}" "$@"
 """
 
 _ZIG_TOOLS = [