[clang] [Clang] Search for 'offload-arch' only next to the clang driver (PR #150965)

[Joseph Huber via cfe-commits]

https://github.com/jhuber6 created https://github.com/llvm/llvm-project/pull/150965

Summary:
Previously, querying for the offload architecture tool would invoke the
user's PATH, which is bad when potentially using the driver from a
direct path. This patch change this to *only* consider the
`offload-arch` that's supposed to live next to the driver executable.
Now we will no longer pick up a potentially conflicting version of this
tool and it should always be found (Since it's a clang tool that's
installazed alongside the driver)


>From 1bd145620500dc7ff740056e494093c2de7f0ef7 Mon Sep 17 00:00:00 2001
From: Joseph Huber <huberjn at outlook.com>
Date: Mon, 28 Jul 2025 09:54:21 -0500
Subject: [PATCH] [Clang] Search for 'offload-arch' only next to the clang
 driver

Summary:
Previously, querying for the offload architecture tool would invoke the
user's PATH, which is bad when potentially using the driver from a
direct path. This patch change this to *only* consider the
`offload-arch` that's supposed to live next to the driver executable.
Now we will no longer pick up a potentially conflicting version of this
tool and it should always be found (Since it's a clang tool that's
installazed alongside the driver)
---
 clang/lib/Driver/Driver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 853f694850ba8..b90bd1d9ea17b 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -910,7 +910,7 @@ getSystemOffloadArchs(Compilation &C, Action::OffloadKind Kind) {
 
   SmallVector<std::string> GPUArchs;
   if (llvm::ErrorOr<std::string> Executable =
-          llvm::sys::findProgramByName(Program)) {
+          llvm::sys::findProgramByName(Program, {C.getDriver().Dir})) {
     llvm::SmallVector<StringRef> Args{*Executable};
     if (Kind == Action::OFK_HIP)
       Args.push_back("--only=amdgpu");