MFC r309124:

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0.  Also completely revamp the build system for
clang, llvm, lldb and their related tools.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.

Relnotes:	yes

MFC r309147:

Pull in r282174 from upstream llvm trunk (by Krzysztof Parzyszek):

  [PPC] Set SP after loading data from stack frame, if no red zone is
  present

  Follow-up to r280705: Make sure that the SP is only restored after
  all data is loaded from the stack frame, if there is no red zone.

  This completes the fix for
  https://llvm.org/bugs/show_bug.cgi?id=26519.

  Differential Revision: https://reviews.llvm.org/D24466

Reported by:    Mark Millard
PR:             214433

MFC r309149:

Pull in r283060 from upstream llvm trunk (by Hal Finkel):

  [PowerPC] Refactor soft-float support, and enable PPC64 soft float

  This change enables soft-float for PowerPC64, and also makes
  soft-float disable all vector instruction sets for both 32-bit and
  64-bit modes. This latter part is necessary because the PPC backend
  canonicalizes many Altivec vector types to floating-point types, and
  so soft-float breaks scalarization support for many operations. Both
  for embedded targets and for operating-system kernels desiring
  soft-float support, it seems reasonable that disabling hardware
  floating-point also disables vector instructions (embedded targets
  without hardware floating point support are unlikely to have Altivec,
  etc. and operating system kernels desiring not to use floating-point
  registers to lower syscall cost are unlikely to want to use vector
  registers either). If someone needs this to work, we'll need to
  change the fact that we promote many Altivec operations to act on
  v4f32. To make it possible to disable Altivec when soft-float is
  enabled, hardware floating-point support needs to be expressed as a
  positive feature, like the others, and not a negative feature,
  because target features cannot have dependencies on the disabling of
  some other feature. So +soft-float has now become -hard-float.

  Fixes PR26970.

Pull in r283061 from upstream clang trunk (by Hal Finkel):

  [PowerPC] Enable soft-float for PPC64, and +soft-float -> -hard-float

  Enable soft-float support on PPC64, as the backend now supports it.
  Also, the backend now uses -hard-float instead of +soft-float, so set
  the target features accordingly.

  Fixes PR26970.

Reported by:	Mark Millard
PR:		214433

MFC r309212:

Add a few missed clang 3.9.0 files to OptionalObsoleteFiles.

MFC r309262:

Fix packaging for clang, lldb and lld 3.9.0

During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.

Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package

Reviewed by:	gjb, jmallett
Differential Revision: https://reviews.freebsd.org/D8666

MFC r309656:

During the bootstrap phase, when building the minimal llvm library on
PowerPC, add lib/Support/Atomic.cpp.  This is needed because upstream
llvm revision r271821 disabled the use of std::call_once, which causes
some fallback functions from Atomic.cpp to be used instead.

Reported by:	Mark Millard
PR:		214902

MFC r309835:

Tentatively apply https://reviews.llvm.org/D18730 to work around gcc PR
70528 (bogus error: constructor required before non-static data member).
This should fix buildworld with the external gcc package.

Reported by:	https://jenkins.freebsd.org/job/FreeBSD_HEAD_amd64_gcc/

MFC r310194:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
3.9.1 release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/3.9.1/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/lld/docs/ReleaseNotes.html>

Relnotes:	yes

1 files changed, 60 insertions, 48 deletions

diff --git a/contrib/llvm/tools/clang/lib/Frontend/HeaderIncludeGen.cpp b/contrib/llvm/tools/clang/lib/Frontend/HeaderIncludeGen.cpp
index 0bc1169..5bff4ec 100644
--- a/contrib/llvm/tools/clang/lib/Frontend/HeaderIncludeGen.cpp
+++ b/contrib/llvm/tools/clang/lib/Frontend/HeaderIncludeGen.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/Frontend/DependencyOutputOptions.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
@@ -19,6 +20,7 @@ namespace {
 class HeaderIncludesCallback : public PPCallbacks {
   SourceManager &SM;
   raw_ostream *OutputFile;
+  const DependencyOutputOptions &DepOpts;
   unsigned CurrentIncludeDepth;
   bool HasProcessedPredefines;
   bool OwnsOutputFile;
@@ -28,12 +30,13 @@ class HeaderIncludesCallback : public PPCallbacks {
 
 public:
   HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_,
-                         raw_ostream *OutputFile_, bool OwnsOutputFile_,
-                         bool ShowDepth_, bool MSStyle_)
-    : SM(PP->getSourceManager()), OutputFile(OutputFile_),
-      CurrentIncludeDepth(0), HasProcessedPredefines(false),
-      OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
-      ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
+                         raw_ostream *OutputFile_,
+                         const DependencyOutputOptions &DepOpts,
+                         bool OwnsOutputFile_, bool ShowDepth_, bool MSStyle_)
+      : SM(PP->getSourceManager()), OutputFile(OutputFile_), DepOpts(DepOpts),
+        CurrentIncludeDepth(0), HasProcessedPredefines(false),
+        OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
+        ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
 
   ~HeaderIncludesCallback() override {
     if (OwnsOutputFile)
@@ -46,38 +49,37 @@ public:
 };
 }
 
-static void PrintHeaderInfo(raw_ostream *OutputFile, const char* Filename,
+static void PrintHeaderInfo(raw_ostream *OutputFile, StringRef Filename,
                             bool ShowDepth, unsigned CurrentIncludeDepth,
                             bool MSStyle) {
-    // Write to a temporary string to avoid unnecessary flushing on errs().
-    SmallString<512> Pathname(Filename);
-    if (!MSStyle)
-      Lexer::Stringify(Pathname);
+  // Write to a temporary string to avoid unnecessary flushing on errs().
+  SmallString<512> Pathname(Filename);
+  if (!MSStyle)
+    Lexer::Stringify(Pathname);
 
-    SmallString<256> Msg;
-    if (MSStyle)
-      Msg += "Note: including file:";
+  SmallString<256> Msg;
+  if (MSStyle)
+    Msg += "Note: including file:";
 
-    if (ShowDepth) {
-      // The main source file is at depth 1, so skip one dot.
-      for (unsigned i = 1; i != CurrentIncludeDepth; ++i)
-        Msg += MSStyle ? ' ' : '.';
+  if (ShowDepth) {
+    // The main source file is at depth 1, so skip one dot.
+    for (unsigned i = 1; i != CurrentIncludeDepth; ++i)
+      Msg += MSStyle ? ' ' : '.';
 
-      if (!MSStyle)
-        Msg += ' ';
-    }
-    Msg += Pathname;
-    Msg += '\n';
+    if (!MSStyle)
+      Msg += ' ';
+  }
+  Msg += Pathname;
+  Msg += '\n';
 
-    OutputFile->write(Msg.data(), Msg.size());
-    OutputFile->flush();
+  *OutputFile << Msg;
+  OutputFile->flush();
 }
 
 void clang::AttachHeaderIncludeGen(Preprocessor &PP,
-                                   const std::vector<std::string> &ExtraHeaders,
-                                   bool ShowAllHeaders,
-                                   StringRef OutputPath, bool ShowDepth,
-                                   bool MSStyle) {
+                                   const DependencyOutputOptions &DepOpts,
+                                   bool ShowAllHeaders, StringRef OutputPath,
+                                   bool ShowDepth, bool MSStyle) {
   raw_ostream *OutputFile = MSStyle ? &llvm::outs() : &llvm::errs();
   bool OwnsOutputFile = false;
 
@@ -97,20 +99,16 @@ void clang::AttachHeaderIncludeGen(Preprocessor &PP,
     }
   }
 
-  // Print header info for extra headers, pretending they were discovered
-  // by the regular preprocessor. The primary use case is to support
-  // proper generation of Make / Ninja file dependencies for implicit includes,
-  // such as sanitizer blacklists. It's only important for cl.exe
-  // compatibility, the GNU way to generate rules is -M / -MM / -MD / -MMD.
-  for (auto Header : ExtraHeaders) {
-    PrintHeaderInfo(OutputFile, Header.c_str(), ShowDepth, 2, MSStyle);
-  }
-  PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(&PP,
-                                                              ShowAllHeaders,
-                                                              OutputFile,
-                                                              OwnsOutputFile,
-                                                              ShowDepth,
-                                                              MSStyle));
+  // Print header info for extra headers, pretending they were discovered by
+  // the regular preprocessor. The primary use case is to support proper
+  // generation of Make / Ninja file dependencies for implicit includes, such
+  // as sanitizer blacklists. It's only important for cl.exe compatibility,
+  // the GNU way to generate rules is -M / -MM / -MD / -MMD.
+  for (const auto &Header : DepOpts.ExtraDeps)
+    PrintHeaderInfo(OutputFile, Header, ShowDepth, 2, MSStyle);
+  PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(
+      &PP, ShowAllHeaders, OutputFile, DepOpts, OwnsOutputFile, ShowDepth,
+      MSStyle));
 }
 
 void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
@@ -132,8 +130,13 @@ void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
 
     // We track when we are done with the predefines by watching for the first
     // place where we drop back to a nesting depth of 1.
-    if (CurrentIncludeDepth == 1 && !HasProcessedPredefines)
+    if (CurrentIncludeDepth == 1 && !HasProcessedPredefines) {
+      if (!DepOpts.ShowIncludesPretendHeader.empty()) {
+        PrintHeaderInfo(OutputFile, DepOpts.ShowIncludesPretendHeader,
+                        ShowDepth, 2, MSStyle);
+      }
       HasProcessedPredefines = true;
+    }
 
     return;
   } else
@@ -144,11 +147,20 @@ void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
   // line buffers.
   bool ShowHeader = (HasProcessedPredefines ||
                      (ShowAllHeaders && CurrentIncludeDepth > 2));
+  unsigned IncludeDepth = CurrentIncludeDepth;
+  if (!HasProcessedPredefines)
+    --IncludeDepth; // Ignore indent from <built-in>.
+  else if (!DepOpts.ShowIncludesPretendHeader.empty())
+    ++IncludeDepth; // Pretend inclusion by ShowIncludesPretendHeader.
 
   // Dump the header include information we are past the predefines buffer or
-  // are showing all headers.
-  if (ShowHeader && Reason == PPCallbacks::EnterFile) {
-    PrintHeaderInfo(OutputFile, UserLoc.getFilename(),
-                    ShowDepth, CurrentIncludeDepth, MSStyle);
+  // are showing all headers and this isn't the magic implicit <command line>
+  // header.
+  // FIXME: Identify headers in a more robust way than comparing their name to
+  // "<command line>" and "<built-in>" in a bunch of places.
+  if (ShowHeader && Reason == PPCallbacks::EnterFile &&
+      UserLoc.getFilename() != StringRef("<command line>")) {
+    PrintHeaderInfo(OutputFile, UserLoc.getFilename(), ShowDepth, IncludeDepth,
+                    MSStyle);
   }
 }