Revert "[clang][AArch64] Add getHostCPUFeatures to query for enabled …

clang/lib/Driver/ToolChains/Arch/AArch64.cpp

@@ -135,21 +135,15 @@ getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
   return true;
 }
 
-static bool getAArch64ArchFeaturesFromMcpu(
-    const Driver &D, StringRef Mcpu, const ArgList &Args,
-    llvm::AArch64::ExtensionSet &Extensions, std::vector<StringRef> &Features) {
+static bool
+getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
+                               const ArgList &Args,
+                               llvm::AArch64::ExtensionSet &Extensions) {
   StringRef CPU;
   std::string McpuLowerCase = Mcpu.lower();
   if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Extensions))
     return false;
 
-  if (Mcpu == "native") {
-    llvm::StringMap<bool> HostFeatures = llvm::sys::getHostCPUFeatures();
-    for (auto &[Feature, Enabled] : HostFeatures) {
-      Features.push_back(Args.MakeArgString((Enabled ? "+" : "-") + Feature));
-    }
-  }
-
   return true;
 }
 
@@ -216,11 +210,11 @@ void aarch64::getAArch64TargetFeatures(const Driver &D,
     success =
         getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Extensions);
   else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
-    success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Extensions,
-                                             Features);
+    success =
+        getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Extensions);
   else if (isCPUDeterminedByTriple(Triple))
     success = getAArch64ArchFeaturesFromMcpu(
-        D, getAArch64TargetCPU(Args, Triple, A), Args, Extensions, Features);
+        D, getAArch64TargetCPU(Args, Triple, A), Args, Extensions);
   else
     // Default to 'A' profile if the architecture is not specified.
     success = getAArch64ArchFeaturesFromMarch(D, "armv8-a", Args, Extensions);

llvm/lib/TargetParser/Host.cpp

@@ -68,15 +68,11 @@ using namespace llvm;
 
 static std::unique_ptr<llvm::MemoryBuffer>
     LLVM_ATTRIBUTE_UNUSED getProcCpuinfoContent() {
-  const char *CPUInfoFile = "/proc/cpuinfo";
-  if (const char *CpuinfoIntercept = std::getenv("LLVM_CPUINFO"))
-    CPUInfoFile = CpuinfoIntercept;
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Text =
-      llvm::MemoryBuffer::getFileAsStream(CPUInfoFile);
-
+      llvm::MemoryBuffer::getFileAsStream("/proc/cpuinfo");
   if (std::error_code EC = Text.getError()) {
-    llvm::errs() << "Can't read " << CPUInfoFile << ": " << EC.message()
-                 << "\n";
+    llvm::errs() << "Can't read "
+                 << "/proc/cpuinfo: " << EC.message() << "\n";
     return nullptr;
   }
   return std::move(*Text);