From 5881dcff7e76a68323edc8bb3c6e14420ad9cf7c Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Thu, 2 Sep 2021 12:42:48 -0400
Subject: [PATCH] Try to unbreak Win build differently after 973519826edb76

Looks like the MS STL wants StringMapKeyIterator::operator*() to be const.
Return the result by copy instead of reference to do that.
Assigning to a hash map key iterator doesn't make sense anyways.

Also reverts 123f811fe5b0b which is now hopefully no longer needed.

Differential Revision: https://reviews.llvm.org/D109167
---
 clang/lib/Driver/ToolChains/Arch/X86.cpp |  5 ++---
 llvm/include/llvm/ADT/StringMap.h        |  8 ++------
 llvm/unittests/ADT/StringMapTest.cpp     | 16 +++++++++++++++-
 3 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Arch/X86.cpp b/clang/lib/Driver/ToolChains/Arch/X86.cpp
index 2e43c45..bfa008f 100644
--- a/clang/lib/Driver/ToolChains/Arch/X86.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/X86.cpp
@@ -59,9 +59,8 @@ std::string x86::getX86TargetCPU(const Driver &D, const ArgList &Args,
     }
     StringRef CPU = ArchMap.lookup(A->getValue());
     if (CPU.empty()) {
-      std::vector<StringRef> ValidArchs;
-      for (StringRef Key : ArchMap.keys())
-        ValidArchs.push_back(Key);
+      std::vector<StringRef> ValidArchs{ArchMap.keys().begin(),
+                                        ArchMap.keys().end()};
       sort(ValidArchs);
       D.Diag(diag::warn_drv_invalid_arch_name_with_suggestion)
           << A->getValue() << (Triple.getArch() == llvm::Triple::x86)
diff --git a/llvm/include/llvm/ADT/StringMap.h b/llvm/include/llvm/ADT/StringMap.h
index 003e62d..fa99ecd 100644
--- a/llvm/include/llvm/ADT/StringMap.h
+++ b/llvm/include/llvm/ADT/StringMap.h
@@ -478,13 +478,9 @@ public:
   explicit StringMapKeyIterator(StringMapConstIterator<ValueTy> Iter)
       : base(std::move(Iter)) {}
 
-  StringRef &operator*() {
-    Key = this->wrapped()->getKey();
-    return Key;
+  StringRef operator*() const {
+    return this->wrapped()->getKey();
   }
-
-private:
-  StringRef Key;
 };
 
 } // end namespace llvm
diff --git a/llvm/unittests/ADT/StringMapTest.cpp b/llvm/unittests/ADT/StringMapTest.cpp
index 6a3cca5..f38a604 100644
--- a/llvm/unittests/ADT/StringMapTest.cpp
+++ b/llvm/unittests/ADT/StringMapTest.cpp
@@ -308,7 +308,21 @@ TEST_F(StringMapTest, InsertOrAssignTest) {
   EXPECT_EQ(0, try1.first->second.copy);
 }
 
-TEST_F(StringMapTest, IterMapKeys) {
+TEST_F(StringMapTest, IterMapKeysVector) {
+  StringMap<int> Map;
+  Map["A"] = 1;
+  Map["B"] = 2;
+  Map["C"] = 3;
+  Map["D"] = 3;
+
+  std::vector<StringRef> Keys{Map.keys().begin(), Map.keys().end()};
+  llvm::sort(Keys);
+
+  std::vector<StringRef> Expected{{"A", "B", "C", "D"}};
+  EXPECT_EQ(Expected, Keys);
+}
+
+TEST_F(StringMapTest, IterMapKeysSmallVector) {
   StringMap<int> Map;
   Map["A"] = 1;
   Map["B"] = 2;
-- 
2.7.4