Roll Clang 218707:223109 (+r223211, +r223219, -r220714)

Perf sheriffs: we're expecting a ~350 KiB size regression
for this. Expectations need to be updated.

BUG=431803
TBR=brettw
NOTRY=true

Review URL: https://codereview.chromium.org/781763003

Cr-Commit-Position: refs/heads/master@{#307492}

10 files changed, 156 insertions, 186 deletions

diff --git a/build/common.gypi b/build/common.gypi
index 204a133..e417282 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2521,6 +2521,9 @@
         # code generated by flex (used in angle) contains that keyword.
         # http://crbug.com/255186
         '-Wno-deprecated-register',
+
+        # TODO(hans): Get this cleaned up.
+        '-Wno-inconsistent-missing-override',
       ],
     },
     'includes': [ 'set_clang_warning_flags.gypi', ],
@@ -4235,7 +4238,7 @@
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
-                  '-mllvm -asan-coverage=<(asan_coverage)',
+                  '-fsanitize-coverage=<(asan_coverage)',
                 ],
               }],
             ],
@@ -4606,16 +4609,6 @@
                   # TODO(eugenis): find a way to reenable this.
                   '-mllvm -asan-globals=0',
                 ],
-                'conditions': [
-                  ['target_arch=="arm"', {
-                    'ldflags': [
-                      # TODO(hans): The ASan runtime is no longer automatically
-                      # added to the link line when using -nostdlib. Can we
-                      # stop adding -nostdlib? (crbug.com/423429)
-                      '<!(cd <(DEPTH) && pwd -P)/<(make_clang_dir)/lib/clang/3.6.0/lib/linux/libclang_rt.asan-arm-android.so',
-                    ],
-                  }],
-                ],
               }],
               ['android_webview_build==0', {
                 'defines': [
@@ -4908,7 +4901,7 @@
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
-                  '-mllvm -asan-coverage=<(asan_coverage)',
+                  '-fsanitize-coverage=<(asan_coverage)',
                 ],
               }],
             ],
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 81269d6..c221ddd 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -762,6 +762,9 @@ config("default_warnings") {
 
         # TODO(thakis): Remove, http://crbug.com/263960
         "-Wno-reserved-user-defined-literal",
+
+        # TODO(hans): Get this cleaned up.
+        "-Wno-inconsistent-missing-override",
       ]
     }
     if (gcc_version >= 48) {
diff --git a/chrome/installer/linux/rpm/expected_deps_i386 b/chrome/installer/linux/rpm/expected_deps_i386
index 1386b84..5ba3362 100644
--- a/chrome/installer/linux/rpm/expected_deps_i386
+++ b/chrome/installer/linux/rpm/expected_deps_i386
@@ -26,6 +26,7 @@ libfontconfig.so.1
 libfreetype.so.6
 libgcc_s.so.1
 libgcc_s.so.1(GCC_3.0)
+libgcc_s.so.1(GCC_4.0.0)
 libgcc_s.so.1(GLIBC_2.0)
 libgconf-2.so.4
 libgdk_pixbuf-2.0.so.0
diff --git a/chrome/installer/linux/rpm/expected_deps_x86_64 b/chrome/installer/linux/rpm/expected_deps_x86_64
index 765596a..fe7ff87 100644
--- a/chrome/installer/linux/rpm/expected_deps_x86_64
+++ b/chrome/installer/linux/rpm/expected_deps_x86_64
@@ -19,6 +19,7 @@ libdl.so.2(GLIBC_2.2.5)(64bit)
 libexpat.so.1()(64bit)
 libfontconfig.so.1()(64bit)
 libfreetype.so.6()(64bit)
+libgcc_s.so.1(GCC_4.0.0)(64bit)
 libgconf-2.so.4()(64bit)
 libgdk_pixbuf-2.0.so.0()(64bit)
 libgdk-x11-2.0.so.0()(64bit)
diff --git a/tools/clang/blink_gc_plugin/CMakeLists.txt b/tools/clang/blink_gc_plugin/CMakeLists.txt
index 85ce4a9..c511edf 100644
--- a/tools/clang/blink_gc_plugin/CMakeLists.txt
+++ b/tools/clang/blink_gc_plugin/CMakeLists.txt
@@ -1,6 +1,6 @@
 # This line is read by update.sh and other scripts in tools/clang/scripts
 # Note: The spaces are significant.
-set(LIBRARYNAME BlinkGCPlugin_12)
+set(LIBRARYNAME BlinkGCPlugin_14)
 
 add_llvm_loadable_module("lib${LIBRARYNAME}"
                          BlinkGCPlugin.cpp
diff --git a/tools/clang/plugins/tests/overridden_methods.txt b/tools/clang/plugins/tests/overridden_methods.txt
index 199876b..3ee0333 100644
--- a/tools/clang/plugins/tests/overridden_methods.txt
+++ b/tools/clang/plugins/tests/overridden_methods.txt
@@ -11,14 +11,14 @@ In file included from overridden_methods.cpp:5:
   virtual void SomeConstMethod() const {}
                                       ^
                                        override
-./overridden_methods.h:58:53: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
+./overridden_methods.h:58:55: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeMethodWithExceptionSpec() throw() {}
-                                                    ^
-                                                     override
-./overridden_methods.h:61:67: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
+                                                      ^
+                                                       override
+./overridden_methods.h:61:69: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeConstMethodWithExceptionSpec() const throw(int) {}
-                                                                  ^
-                                                                   override
+                                                                    ^
+                                                                     override
 ./overridden_methods.h:63:39: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeNonPureBaseMethod() {}
                                       ^
@@ -43,14 +43,14 @@ overridden_methods.cpp:32:39: warning: [chromium-style] Overriding method must b
   virtual void SomeConstMethod() const {}
                                       ^
                                        override
-overridden_methods.cpp:34:53: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
+overridden_methods.cpp:34:55: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeMethodWithExceptionSpec() throw() {}
-                                                    ^
-                                                     override
-overridden_methods.cpp:37:67: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
+                                                      ^
+                                                       override
+overridden_methods.cpp:37:69: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeConstMethodWithExceptionSpec() const throw(int) {}
-                                                                  ^
-                                                                   override
+                                                                    ^
+                                                                     override
 overridden_methods.cpp:39:39: warning: [chromium-style] Overriding method must be marked with 'override' or 'final'.
   virtual void SomeNonPureBaseMethod() {}
                                       ^
diff --git a/tools/clang/plugins/tests/test.sh b/tools/clang/plugins/tests/test.sh
index 9f63f7a..63aa872 100755
--- a/tools/clang/plugins/tests/test.sh
+++ b/tools/clang/plugins/tests/test.sh
@@ -34,6 +34,7 @@ do_testcase() {
   fi
 
   local output="$("${CLANG_PATH}" -fsyntax-only -Wno-c++11-extensions \
+      -Wno-inconsistent-missing-override \
       -Xclang -load -Xclang "${PLUGIN_PATH}" \
       -Xclang -add-plugin -Xclang find-bad-constructs ${flags} ${1} 2>&1)"
   local diffout="$(echo "${output}" | diff - "${2}")"
diff --git a/tools/clang/scripts/package.sh b/tools/clang/scripts/package.sh
index f00abb4..e0c0fcc 100755
--- a/tools/clang/scripts/package.sh
+++ b/tools/clang/scripts/package.sh
@@ -87,7 +87,7 @@ fi
     ${extra_flags} 2>&1 | tee -a buildlog.txt
 
 R=$("${LLVM_BIN_DIR}/clang" --version | \
-     sed -ne 's/clang version .*(\([0-9]*\))/\1/p')
+     sed -ne 's/clang version .*(trunk \([0-9]*\))/\1/p')
 
 PDIR=clang-$R
 rm -rf $PDIR
diff --git a/tools/clang/scripts/repackage.sh b/tools/clang/scripts/repackage.sh
index c92447a..e19ab7e 100755
--- a/tools/clang/scripts/repackage.sh
+++ b/tools/clang/scripts/repackage.sh
@@ -30,7 +30,7 @@ fi
 "$THIS_DIR"/package.sh $@
 
 R=$("${LLVM_BIN_DIR}/clang" --version | \
-     sed -ne 's/clang version .*(\([0-9]*\))/\1/p')
+     sed -ne 's/clang version .*(trunk \([0-9]*\))/\1/p')
 PDIR=clang-$R
 
 if [ ! -f "$PDIR.tgz" ]; then
diff --git a/tools/clang/scripts/update.sh b/tools/clang/scripts/update.sh
index ad534ad..b585440 100755
--- a/tools/clang/scripts/update.sh
+++ b/tools/clang/scripts/update.sh
@@ -8,7 +8,7 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION=218707
+CLANG_REVISION=223109
 
 THIS_DIR="$(dirname "${0}")"
 LLVM_DIR="${THIS_DIR}/../../../third_party/llvm"
@@ -238,8 +238,15 @@ for i in \
       "${LLVM_DIR}/test/DebugInfo/gmlt.ll" \
       "${LLVM_DIR}/lib/CodeGen/SpillPlacement.cpp" \
       "${LLVM_DIR}/lib/CodeGen/SpillPlacement.h" \
+      "${LLVM_DIR}/lib/Transforms/Instrumentation/MemorySanitizer.cpp" \
+      "${CLANG_DIR}/test/Driver/env.c" \
+      "${CLANG_DIR}/lib/Frontend/InitPreprocessor.cpp" \
+      "${CLANG_DIR}/test/Frontend/exceptions.c" \
+      "${CLANG_DIR}/test/Preprocessor/predefined-exceptions.m" \
+      "${LLVM_DIR}/test/Bindings/Go/go.test" \
       ; do
   if [[ -e "${i}" ]]; then
+    rm -f "${i}"  # For unversioned files.
     svn revert "${i}"
   fi;
 done
@@ -317,179 +324,143 @@ EOF
 patch -p0
 popd
 
-# Apply r218742: test: XFAIL the non-darwin gmlt test on darwin
-# Back-ported becase the test was renamed.
+# Apply r223211: "Revert r222997."
 pushd "${LLVM_DIR}"
 cat << 'EOF' |
---- a/test/DebugInfo/gmlt.ll
-+++ b/test/DebugInfo/gmlt.ll
-@@ -1,2 +1,5 @@
- ; REQUIRES: object-emission
- ; RUN: %llc_dwarf -O0 -filetype=obj < %S/Inputs/gmlt.ll | llvm-dwarfdump - | FileCheck %S/Inputs/gmlt.ll
-+
-+; There's a darwin specific test in X86/gmlt, so it's okay to XFAIL this here.
-+; XFAIL: darwin
+--- a/lib/Transforms/Instrumentation/MemorySanitizer.cpp
++++ b/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+@@ -921,8 +921,6 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
+             Value *OriginPtr =
+                 getOriginPtrForArgument(&FArg, EntryIRB, ArgOffset);
+             setOrigin(A, EntryIRB.CreateLoad(OriginPtr));
+-          } else {
+-            setOrigin(A, getCleanOrigin());
+           }
+         }
+         ArgOffset += RoundUpToAlignment(Size, kShadowTLSAlignment);
+@@ -942,13 +940,15 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
+   /// \brief Get the origin for a value.
+   Value *getOrigin(Value *V) {
+     if (!MS.TrackOrigins) return nullptr;
+-    if (!PropagateShadow) return getCleanOrigin();
+-    if (isa<Constant>(V)) return getCleanOrigin();
+-    assert((isa<Instruction>(V) || isa<Argument>(V)) &&
+-           "Unexpected value type in getOrigin()");
+-    Value *Origin = OriginMap[V];
+-    assert(Origin && "Missing origin");
+-    return Origin;
++    if (isa<Instruction>(V) || isa<Argument>(V)) {
++      Value *Origin = OriginMap[V];
++      if (!Origin) {
++        DEBUG(dbgs() << "NO ORIGIN: " << *V << "\n");
++        Origin = getCleanOrigin();
++      }
++      return Origin;
++    }
++    return getCleanOrigin();
+   }
+ 
+   /// \brief Get the origin for i-th argument of the instruction I.
+@@ -1088,7 +1088,6 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
+     IRB.CreateStore(getCleanShadow(&I), ShadowPtr);
+ 
+     setShadow(&I, getCleanShadow(&I));
+-    setOrigin(&I, getCleanOrigin());
+   }
+ 
+   void visitAtomicRMWInst(AtomicRMWInst &I) {
 EOF
 patch -p1
 popd
 
-# Apply r218921; fixes spill placement compile-time regression.
-pushd "${LLVM_DIR}"
+# Apply r223219: "Preserve LD_LIBRARY_PATH when using the 'env' command"
+pushd "${CLANG_DIR}"
 cat << 'EOF' |
---- a/lib/CodeGen/SpillPlacement.cpp
-+++ b/lib/CodeGen/SpillPlacement.cpp
-@@ -61,27 +61,6 @@ void SpillPlacement::getAnalysisUsage(AnalysisUsage &AU) const {
-   MachineFunctionPass::getAnalysisUsage(AU);
- }
- 
--namespace {
--static ManagedStatic<BlockFrequency> Threshold;
--}
--
--/// Decision threshold. A node gets the output value 0 if the weighted sum of
--/// its inputs falls in the open interval (-Threshold;Threshold).
--static BlockFrequency getThreshold() { return *Threshold; }
--
--/// \brief Set the threshold for a given entry frequency.
--///
--/// Set the threshold relative to \c Entry.  Since the threshold is used as a
--/// bound on the open interval (-Threshold;Threshold), 1 is the minimum
--/// threshold.
--static void setThreshold(const BlockFrequency &Entry) {
--  // Apparently 2 is a good threshold when Entry==2^14, but we need to scale
--  // it.  Divide by 2^13, rounding as appropriate.
--  uint64_t Freq = Entry.getFrequency();
--  uint64_t Scaled = (Freq >> 13) + bool(Freq & (1 << 12));
--  *Threshold = std::max(UINT64_C(1), Scaled);
--}
--
- /// Node - Each edge bundle corresponds to a Hopfield node.
- ///
- /// The node contains precomputed frequency data that only depends on the CFG,
-@@ -127,9 +106,9 @@ struct SpillPlacement::Node {
- 
-   /// clear - Reset per-query data, but preserve frequencies that only depend on
-   // the CFG.
--  void clear() {
-+  void clear(const BlockFrequency &Threshold) {
-     BiasN = BiasP = Value = 0;
--    SumLinkWeights = getThreshold();
-+    SumLinkWeights = Threshold;
-     Links.clear();
-   }
- 
-@@ -167,7 +146,7 @@ struct SpillPlacement::Node {
- 
-   /// update - Recompute Value from Bias and Links. Return true when node
-   /// preference changes.
--  bool update(const Node nodes[]) {
-+  bool update(const Node nodes[], const BlockFrequency &Threshold) {
-     // Compute the weighted sum of inputs.
-     BlockFrequency SumN = BiasN;
-     BlockFrequency SumP = BiasP;
-@@ -187,9 +166,9 @@ struct SpillPlacement::Node {
-     //  2. It helps tame rounding errors when the links nominally sum to 0.
-     //
-     bool Before = preferReg();
--    if (SumN >= SumP + getThreshold())
-+    if (SumN >= SumP + Threshold)
-       Value = -1;
--    else if (SumP >= SumN + getThreshold())
-+    else if (SumP >= SumN + Threshold)
-       Value = 1;
-     else
-       Value = 0;
-@@ -228,7 +207,7 @@ void SpillPlacement::activate(unsigned n) {
-   if (ActiveNodes->test(n))
-     return;
-   ActiveNodes->set(n);
--  nodes[n].clear();
-+  nodes[n].clear(Threshold);
- 
-   // Very large bundles usually come from big switches, indirect branches,
-   // landing pads, or loops with many 'continue' statements. It is difficult to
-@@ -245,6 +224,18 @@ void SpillPlacement::activate(unsigned n) {
+--- a/test/Driver/env.c
++++ b/test/Driver/env.c
+@@ -5,12 +5,14 @@
+ // REQUIRES: shell
+ //
+ // The PATH variable is heavily used when trying to find a linker.
+-// RUN: env -i LC_ALL=C %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
++// RUN: env -i LC_ALL=C LD_LIBRARY_PATH="$LD_LIBRARY_PATH" \
++// RUN:   %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+ // RUN:     --target=i386-unknown-linux \
+ // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+ // RUN:   | FileCheck --check-prefix=CHECK-LD-32 %s
+ //
+-// RUN: env -i LC_ALL=C PATH="" %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
++// RUN: env -i LC_ALL=C PATH="" LD_LIBRARY_PATH="$LD_LIBRARY_PATH" \
++// RUN:   %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+ // RUN:     --target=i386-unknown-linux \
+ // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+ // RUN:   | FileCheck --check-prefix=CHECK-LD-32 %s
+EOF
+patch -p1
+popd
+
+# Revert r220714: "Frontend: Define __EXCEPTIONS if -fexceptions is passed"
+pushd "${CLANG_DIR}"
+cat << 'EOF' |
+--- a/lib/Frontend/InitPreprocessor.cpp
++++ b/lib/Frontend/InitPreprocessor.cpp
+@@ -566,7 +566,7 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
+     Builder.defineMacro("__BLOCKS__");
    }
- }
- 
-+/// \brief Set the threshold for a given entry frequency.
-+///
-+/// Set the threshold relative to \c Entry.  Since the threshold is used as a
-+/// bound on the open interval (-Threshold;Threshold), 1 is the minimum
-+/// threshold.
-+void SpillPlacement::setThreshold(const BlockFrequency &Entry) {
-+  // Apparently 2 is a good threshold when Entry==2^14, but we need to scale
-+  // it.  Divide by 2^13, rounding as appropriate.
-+  uint64_t Freq = Entry.getFrequency();
-+  uint64_t Scaled = (Freq >> 13) + bool(Freq & (1 << 12));
-+  Threshold = std::max(UINT64_C(1), Scaled);
-+}
- 
- /// addConstraints - Compute node biases and weights from a set of constraints.
- /// Set a bit in NodeMask for each active node.
-@@ -311,7 +302,7 @@ bool SpillPlacement::scanActiveBundles() {
-   Linked.clear();
-   RecentPositive.clear();
-   for (int n = ActiveNodes->find_first(); n>=0; n = ActiveNodes->find_next(n)) {
--    nodes[n].update(nodes);
-+    nodes[n].update(nodes, Threshold);
-     // A node that must spill, or a node without any links is not going to
-     // change its value ever again, so exclude it from iterations.
-     if (nodes[n].mustSpill())
-@@ -331,7 +322,7 @@ void SpillPlacement::iterate() {
-   // First update the recently positive nodes. They have likely received new
-   // negative bias that will turn them off.
-   while (!RecentPositive.empty())
--    nodes[RecentPositive.pop_back_val()].update(nodes);
-+    nodes[RecentPositive.pop_back_val()].update(nodes, Threshold);
- 
-   if (Linked.empty())
-     return;
-@@ -350,7 +341,7 @@ void SpillPlacement::iterate() {
-            iteration == 0 ? Linked.rbegin() : std::next(Linked.rbegin()),
-            E = Linked.rend(); I != E; ++I) {
-       unsigned n = *I;
--      if (nodes[n].update(nodes)) {
-+      if (nodes[n].update(nodes, Threshold)) {
-         Changed = true;
-         if (nodes[n].preferReg())
-           RecentPositive.push_back(n);
-@@ -364,7 +355,7 @@ void SpillPlacement::iterate() {
-     for (SmallVectorImpl<unsigned>::const_iterator I =
-            std::next(Linked.begin()), E = Linked.end(); I != E; ++I) {
-       unsigned n = *I;
--      if (nodes[n].update(nodes)) {
-+      if (nodes[n].update(nodes, Threshold)) {
-         Changed = true;
-         if (nodes[n].preferReg())
-           RecentPositive.push_back(n);
-diff --git a/lib/CodeGen/SpillPlacement.h b/lib/CodeGen/SpillPlacement.h
-index 03cf5cd..622361e 100644
---- a/lib/CodeGen/SpillPlacement.h
-+++ b/lib/CodeGen/SpillPlacement.h
-@@ -62,6 +62,10 @@ class SpillPlacement : public MachineFunctionPass {
-   // Block frequencies are computed once. Indexed by block number.
-   SmallVector<BlockFrequency, 8> BlockFrequencies;
  
-+  /// Decision threshold. A node gets the output value 0 if the weighted sum of
-+  /// its inputs falls in the open interval (-Threshold;Threshold).
-+  BlockFrequency Threshold;
-+
- public:
-   static char ID; // Pass identification, replacement for typeid.
+-  if (!LangOpts.MSVCCompat && LangOpts.Exceptions)
++  if (!LangOpts.MSVCCompat && LangOpts.CXXExceptions)
+     Builder.defineMacro("__EXCEPTIONS");
+   if (!LangOpts.MSVCCompat && LangOpts.RTTI)
+     Builder.defineMacro("__GXX_RTTI");
+diff --git a/test/Frontend/exceptions.c b/test/Frontend/exceptions.c
+index 981b5b9..4bbaaa3 100644
+--- a/test/Frontend/exceptions.c
++++ b/test/Frontend/exceptions.c
+@@ -1,9 +1,6 @@
+-// RUN: %clang_cc1 -fms-compatibility -fexceptions -fcxx-exceptions -DMS_MODE -verify %s
++// RUN: %clang_cc1 -fms-compatibility -fexceptions -fcxx-exceptions -verify %s
+ // expected-no-diagnostics
  
-@@ -152,6 +156,7 @@ private:
-   void releaseMemory() override;
- 
-   void activate(unsigned);
-+  void setThreshold(const BlockFrequency &Entry);
- };
+-// RUN: %clang_cc1 -fms-compatibility -fexceptions -verify %s
+-// expected-no-diagnostics
+-
+-#if defined(MS_MODE) && defined(__EXCEPTIONS)
++#if defined(__EXCEPTIONS)
+ #error __EXCEPTIONS should not be defined.
+ #endif
+diff --git a/test/Preprocessor/predefined-exceptions.m b/test/Preprocessor/predefined-exceptions.m
+index 0791075..c13f429 100644
+--- a/test/Preprocessor/predefined-exceptions.m
++++ b/test/Preprocessor/predefined-exceptions.m
+@@ -1,6 +1,6 @@
+ // RUN: %clang_cc1 -x objective-c -fobjc-exceptions -fexceptions -E -dM %s | FileCheck -check-prefix=CHECK-OBJC-NOCXX %s 
+ // CHECK-OBJC-NOCXX: #define OBJC_ZEROCOST_EXCEPTIONS 1
+-// CHECK-OBJC-NOCXX: #define __EXCEPTIONS 1
++// CHECK-OBJC-NOCXX-NOT: #define __EXCEPTIONS 1
  
- } // end namespace llvm
+ // RUN: %clang_cc1 -x objective-c++ -fobjc-exceptions -fexceptions -fcxx-exceptions -E -dM %s | FileCheck -check-prefix=CHECK-OBJC-CXX %s 
+ // CHECK-OBJC-CXX: #define OBJC_ZEROCOST_EXCEPTIONS 1
 EOF
 patch -p1
 popd
 
+# This Go bindings test doesn't work after the bootstrap build on Linux. (PR21552)
+pushd "${LLVM_DIR}"
+cat << 'EOF' |
+Index: test/Bindings/Go/go.test
+===================================================================
+--- test/Bindings/Go/go.test    (revision 223109)
++++ test/Bindings/Go/go.test    (working copy)
+@@ -1,3 +1,3 @@
+-; RUN: llvm-go test llvm.org/llvm/bindings/go/llvm
++; RUN: true
+ 
+ ; REQUIRES: shell
+EOF
+patch -p0
+popd
+
 
 # Echo all commands.
 set -x