Add a WITH_CLANG_EXTRAS option for src.conf(5), disabled by default,

that builds the following additional llvm/clang tools:

- bugpoint
- llc
- lli
- llvm-ar
- llvm-as
- llvm-bcanalyzer
- llvm-diff
- llvm-dis
- llvm-extract
- llvm-ld
- llvm-link
- llvm-mc
- llvm-nm
- llvm-objdump
- llvm-prof
- llvm-ranlib
- llvm-rtdyld
- llvm-stub
- macho-dump
- opt

These tools are mainly useful for people that want to manipulate llvm
bitcode (.bc) and llvm assembly language (.ll) files, or want to tinker
with llvm and clang themselves.

MFC after:	2 weeks

1 files changed, 119 insertions, 0 deletions

diff --git a/contrib/llvm/tools/llvm-as/llvm-as.cpp b/contrib/llvm/tools/llvm-as/llvm-as.cpp
new file mode 100644
index 0000000..c1661cd
--- /dev/null
+++ b/contrib/llvm/tools/llvm-as/llvm-as.cpp
@@ -0,0 +1,119 @@
+//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This utility may be invoked in the following manner:
+//   llvm-as --help         - Output information about command line switches
+//   llvm-as [options]      - Read LLVM asm from stdin, write bitcode to stdout
+//   llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
+//                            to the x.bc file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/Signals.h"
+#include <memory>
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+               cl::value_desc("filename"));
+
+static cl::opt<bool>
+Force("f", cl::desc("Enable binary output on terminals"));
+
+static cl::opt<bool>
+DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
+
+static cl::opt<bool>
+DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
+
+static cl::opt<bool>
+DisableVerify("disable-verify", cl::Hidden,
+              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
+
+static void WriteOutputFile(const Module *M) {
+  // Infer the output filename if needed.
+  if (OutputFilename.empty()) {
+    if (InputFilename == "-") {
+      OutputFilename = "-";
+    } else {
+      std::string IFN = InputFilename;
+      int Len = IFN.length();
+      if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
+        // Source ends in .ll
+        OutputFilename = std::string(IFN.begin(), IFN.end()-3);
+      } else {
+        OutputFilename = IFN;   // Append a .bc to it
+      }
+      OutputFilename += ".bc";
+    }
+  }
+
+  std::string ErrorInfo;
+  OwningPtr<tool_output_file> Out
+  (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
+                        raw_fd_ostream::F_Binary));
+  if (!ErrorInfo.empty()) {
+    errs() << ErrorInfo << '\n';
+    exit(1);
+  }
+
+  if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
+    WriteBitcodeToFile(M, Out->os());
+
+  // Declare success.
+  Out->keep();
+}
+
+int main(int argc, char **argv) {
+  // Print a stack trace if we signal out.
+  sys::PrintStackTraceOnErrorSignal();
+  PrettyStackTraceProgram X(argc, argv);
+  LLVMContext &Context = getGlobalContext();
+  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
+  cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
+
+  // Parse the file now...
+  SMDiagnostic Err;
+  std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context));
+  if (M.get() == 0) {
+    Err.Print(argv[0], errs());
+    return 1;
+  }
+
+  if (!DisableVerify) {
+    std::string Err;
+    if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
+      errs() << argv[0]
+             << ": assembly parsed, but does not verify as correct!\n";
+      errs() << Err;
+      return 1;
+    }
+  }
+
+  if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
+
+  if (!DisableOutput)
+    WriteOutputFile(M.get());
+
+  return 0;
+}