[clang] clang: Fix warnings with multiple offload arch args (PR #189329)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/189329

Fix regression after ab885fdf5f67726ef564c34087e813f2ca861f5c.
Apparently driver tests do not enforce there are no warnings.
Oddly, I need to use -Werror for the specific error. If I use
just -Werror, I get an error that the -Werror is unused.

>From 5ff83cb0b4d50860fc67de67d7bdc17ffedcdd5c Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Mon, 30 Mar 2026 09:11:19 +0200
Subject: [PATCH] clang: Fix warnings with multiple offload arch args

Fix regression after ab885fdf5f67726ef564c34087e813f2ca861f5c.
Apparently driver tests do not enforce there are no warnings.
Oddly, I need to use -Werror for the specific error. If I use
just -Werror, I get an error that the -Werror is unused.
---
 clang/lib/Driver/Driver.cpp       | 5 ++++-
 clang/test/Driver/hip-binding.hip | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index aff34603b8b86..55c9c7766d021 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1015,7 +1015,10 @@ static TripleSet inferOffloadToolchains(Compilation &C,
     A->claim();
     C.getArgs().append(A);
     C.getArgs().AddSynthesizedArg(A);
-    Triples.insert(Triple);
+
+    auto It = Triples.lower_bound(Triple);
+    if (It == Triples.end() || *It != Triple)
+      Triples.insert(It, Triple);
   }
 
   // Infer the default target triple if no specific architectures are given.
diff --git a/clang/test/Driver/hip-binding.hip b/clang/test/Driver/hip-binding.hip
index 1c02cfaadfad2..cf44692259257 100644
--- a/clang/test/Driver/hip-binding.hip
+++ b/clang/test/Driver/hip-binding.hip
@@ -1,4 +1,4 @@
-// RUN: %clang -ccc-print-bindings --target=x86_64-linux-gnu \
+// RUN: %clang -Werror=openmp-target -ccc-print-bindings --target=x86_64-linux-gnu \
 // RUN:   --cuda-gpu-arch=gfx803 --cuda-gpu-arch=gfx900 %s \
 // RUN:   --no-offload-new-driver -c 2>&1 | FileCheck -check-prefix=NRDCS %s
 // RUN: %clang -ccc-print-bindings --target=x86_64-linux-gnu --offload-new-driver \