Revert "[Tooling] Make clang-tool find libc++ dir on mac when running on a file without compilation database."

This reverts commits r351222 and r351229, they were causing ASan/MSan failures
on the sanitizer bots.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@351282 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Tooling/CompilationDatabase.cpp

@@ -227,16 +227,6 @@ struct FilterUnusedFlags {
   }
 };
 
-std::string GetClangToolCommand() {
-  static int Dummy;
-  std::string ClangExecutable =
-      llvm::sys::fs::getMainExecutable("clang", (void *)&Dummy);
-  SmallString<128> ClangToolPath;
-  ClangToolPath = llvm::sys::path::parent_path(ClangExecutable);
-  llvm::sys::path::append(ClangToolPath, "clang-tool");
-  return ClangToolPath.str();
-}
-
 } // namespace
 
 /// Strips any positional args and possible argv[0] from a command-line
@@ -276,9 +266,9 @@ static bool stripPositionalArgs(std::vector<const char *> Args,
       Diagnostics));
   NewDriver->setCheckInputsExist(false);
 
-  // This becomes the new argv[0]. The value is used to detect libc++ include
-  // dirs on Mac, it isn't used for other platforms.
-  Args.insert(Args.begin(), GetClangToolCommand().c_str());
+  // This becomes the new argv[0]. The value is actually not important as it
+  // isn't used for invoking Tools.
+  Args.insert(Args.begin(), "clang-tool");
 
   // By adding -c, we force the driver to treat compilation as the last phase.
   // It will then issue warnings via Diagnostics about un-used options that
@@ -376,7 +366,7 @@ FixedCompilationDatabase::loadFromFile(StringRef Path, std::string &ErrorMsg) {
 
 FixedCompilationDatabase::
 FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine) {
-  std::vector<std::string> ToolCommandLine(1, GetClangToolCommand());
+  std::vector<std::string> ToolCommandLine(1, "clang-tool");
   ToolCommandLine.insert(ToolCommandLine.end(),
                          CommandLine.begin(), CommandLine.end());
   CompileCommands.emplace_back(Directory, StringRef(),

test/Tooling/clang-check-mac-libcxx-fixed-compilation-db.cpp

@@ -1,16 +0,0 @@
-// Clang on MacOS can find libc++ living beside the installed compiler.
-// This test makes sure our libTooling-based tools emulate this properly with
-// fixed compilation database.
-//
-// RUN: rm -rf %t
-// RUN: mkdir %t
-//
-// Install the mock libc++ (simulates the libc++ directory structure).
-// RUN: cp -r %S/Inputs/mock-libcxx %t/
-//
-// RUN: cp clang-check %t/mock-libcxx/bin/
-// RUN: cp "%s" "%t/test.cpp"
-// RUN: %t/mock-libcxx/bin/clang-check -p "%t" "%t/test.cpp" -- -stdlib=libc++
-
-#include <mock_vector>
-vector v;

unittests/Tooling/CompilationDatabaseTest.cpp

@@ -14,15 +14,11 @@
 #include "clang/Tooling/JSONCompilationDatabase.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/Support/Path.h"
-#include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 namespace clang {
 namespace tooling {
 
-using testing::ElementsAre;
-using testing::EndsWith;
-
 static void expectFailure(StringRef JSONDatabase, StringRef Explanation) {
   std::string ErrorMessage;
   EXPECT_EQ(nullptr,
@@ -471,15 +467,21 @@ TEST(unescapeJsonCommandLine, ParsesSingleQuotedString) {
 }
 
 TEST(FixedCompilationDatabase, ReturnsFixedCommandLine) {
-  FixedCompilationDatabase Database(".", /*CommandLine*/ {"one", "two"});
+  std::vector<std::string> CommandLine;
+  CommandLine.push_back("one");
+  CommandLine.push_back("two");
+  FixedCompilationDatabase Database(".", CommandLine);
   StringRef FileName("source");
   std::vector<CompileCommand> Result =
     Database.getCompileCommands(FileName);
   ASSERT_EQ(1ul, Result.size());
+  std::vector<std::string> ExpectedCommandLine(1, "clang-tool");
+  ExpectedCommandLine.insert(ExpectedCommandLine.end(),
+                             CommandLine.begin(), CommandLine.end());
+  ExpectedCommandLine.push_back("source");
   EXPECT_EQ(".", Result[0].Directory);
   EXPECT_EQ(FileName, Result[0].Filename);
-  EXPECT_THAT(Result[0].CommandLine,
-              ElementsAre(EndsWith("clang-tool"), "one", "two", "source"));
+  EXPECT_EQ(ExpectedCommandLine, Result[0].CommandLine);
 }
 
 TEST(FixedCompilationDatabase, GetAllFiles) {
@@ -535,8 +537,12 @@ TEST(ParseFixedCompilationDatabase, ReturnsArgumentsAfterDoubleDash) {
     Database->getCompileCommands("source");
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
-  ASSERT_THAT(Result[0].CommandLine, ElementsAre(EndsWith("clang-tool"),
-                                                 "-DDEF3", "-DDEF4", "source"));
+  std::vector<std::string> CommandLine;
+  CommandLine.push_back("clang-tool");
+  CommandLine.push_back("-DDEF3");
+  CommandLine.push_back("-DDEF4");
+  CommandLine.push_back("source");
+  ASSERT_EQ(CommandLine, Result[0].CommandLine);
   EXPECT_EQ(2, Argc);
 }
 
@@ -552,8 +558,10 @@ TEST(ParseFixedCompilationDatabase, ReturnsEmptyCommandLine) {
     Database->getCompileCommands("source");
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
-  ASSERT_THAT(Result[0].CommandLine,
-              ElementsAre(EndsWith("clang-tool"), "source"));
+  std::vector<std::string> CommandLine;
+  CommandLine.push_back("clang-tool");
+  CommandLine.push_back("source");
+  ASSERT_EQ(CommandLine, Result[0].CommandLine);
   EXPECT_EQ(2, Argc);
 }
 
@@ -569,8 +577,12 @@ TEST(ParseFixedCompilationDatabase, HandlesPositionalArgs) {
     Database->getCompileCommands("source");
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
-  ASSERT_THAT(Result[0].CommandLine,
-              ElementsAre(EndsWith("clang-tool"), "-c", "-DDEF3", "source"));
+  std::vector<std::string> Expected;
+  Expected.push_back("clang-tool");
+  Expected.push_back("-c");
+  Expected.push_back("-DDEF3");
+  Expected.push_back("source");
+  ASSERT_EQ(Expected, Result[0].CommandLine);
   EXPECT_EQ(2, Argc);
 }
 
@@ -587,9 +599,12 @@ TEST(ParseFixedCompilationDatabase, HandlesPositionalArgsSyntaxOnly) {
   std::vector<CompileCommand> Result = Database->getCompileCommands("source");
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
-  ASSERT_THAT(
-      Result[0].CommandLine,
-      ElementsAre(EndsWith("clang-tool"), "-fsyntax-only", "-DDEF3", "source"));
+  std::vector<std::string> Expected;
+  Expected.push_back("clang-tool");
+  Expected.push_back("-fsyntax-only");
+  Expected.push_back("-DDEF3");
+  Expected.push_back("source");
+  ASSERT_EQ(Expected, Result[0].CommandLine);
 }
 
 TEST(ParseFixedCompilationDatabase, HandlesArgv0) {
@@ -605,8 +620,9 @@ TEST(ParseFixedCompilationDatabase, HandlesArgv0) {
   ASSERT_EQ(1ul, Result.size());
   ASSERT_EQ(".", Result[0].Directory);
   std::vector<std::string> Expected;
-  ASSERT_THAT(Result[0].CommandLine,
-              ElementsAre(EndsWith("clang-tool"), "source"));
+  Expected.push_back("clang-tool");
+  Expected.push_back("source");
+  ASSERT_EQ(Expected, Result[0].CommandLine);
   EXPECT_EQ(2, Argc);
 }