[clang] clang/AMDGPU: Remove unnecessary fallback to check -march (PR #199780)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/199780

-march is now rewritten to -mcpu.

>From 33cfbdf495f1f609f9d537518851867a05b1568b Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Tue, 26 May 2026 18:21:00 +0100
Subject: [PATCH] clang/AMDGPU: Remove unnecessary fallback to check -march

-march is now rewritten to -mcpu.
---
 clang/lib/Driver/ToolChains/AMDGPU.cpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/AMDGPU.cpp b/clang/lib/Driver/ToolChains/AMDGPU.cpp
index c58891b1add56..91ff92466df43 100644
--- a/clang/lib/Driver/ToolChains/AMDGPU.cpp
+++ b/clang/lib/Driver/ToolChains/AMDGPU.cpp
@@ -907,10 +907,7 @@ AMDGPUToolChain::ParsedTargetIDType
 AMDGPUToolChain::getParsedTargetID(const llvm::opt::ArgList &DriverArgs) const {
   StringRef TargetID = DriverArgs.getLastArgValue(options::OPT_mcpu_EQ);
   if (TargetID.empty())
-    TargetID = DriverArgs.getLastArgValue(options::OPT_march_EQ);
-
-  if (TargetID.empty())
-    return {std::nullopt, std::nullopt, std::nullopt};
+    return {};
 
   llvm::StringMap<bool> FeatureMap;
   auto OptionalGpuArch = parseTargetID(getTriple(), TargetID, &FeatureMap);