From 1dc7764f2ddc2f3bd78f96017fd2dd2227280055 Mon Sep 17 00:00:00 2001
From: Michael Dusan <michael.dusan@gmail.com>
Date: Mon, 24 May 2021 02:29:22 -0400
Subject: [PATCH] clang driver: fix lost argv[0]

---
 src/zig_clang_driver.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/zig_clang_driver.cpp b/src/zig_clang_driver.cpp
index ac892f95e8..468c437a7d 100644
--- a/src/zig_clang_driver.cpp
+++ b/src/zig_clang_driver.cpp
@@ -448,7 +448,9 @@ int ZigClang_main(int argc_, const char **argv_) {
     ApplyQAOverride(argv, OverrideStr, SavedStrings);
   }
 
-  std::string Path = GetExecutablePath(argv[0], CanonicalPrefixes);
+  // Pass local param `argv_[0]` as fallback.
+  // See https://github.com/ziglang/zig/pull/3292 .
+  std::string Path = GetExecutablePath(argv_[0], CanonicalPrefixes);
 
   // Whether the cc1 tool should be called inside the current process, or if we
   // should spawn a new clang subprocess (old behavior).