1 files changed, 52 insertions, 0 deletions
diff --git a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
index 683d9070b1dc..d194b2877ad8 100644
--- a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
+++ b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
@@ -384,3 +384,55 @@ TEST(DependencyScanner, ScanDepsWithDiagConsumer) {
     EXPECT_TRUE(DiagConsumer.Finished);
   }
 }
+
+TEST(DependencyScanner, NoNegativeCache) {
+  StringRef CWD = "/root";
+
+  auto VFS = new llvm::vfs::InMemoryFileSystem();
+  VFS->setCurrentWorkingDirectory(CWD);
+  auto Sept = llvm::sys::path::get_separator();
+  std::string HeaderPath =
+      std::string(llvm::formatv("{0}root{0}header.h", Sept));
+  std::string Test0Path =
+      std::string(llvm::formatv("{0}root{0}test0.cpp", Sept));
+  std::string Test1Path =
+      std::string(llvm::formatv("{0}root{0}test1.cpp", Sept));
+
+  VFS->addFile(Test0Path, 0,
+               llvm::MemoryBuffer::getMemBuffer(
+                   "#if __has_include(\"header.h\")\n#endif"));
+  VFS->addFile(Test1Path, 0,
+               llvm::MemoryBuffer::getMemBuffer("#include \"header.h\""));
+
+  DependencyScanningService Service(
+      ScanningMode::DependencyDirectivesScan, ScanningOutputFormat::Make,
+      ScanningOptimizations::All, false, false,
+      llvm::sys::toTimeT(std::chrono::system_clock::now()), false);
+  DependencyScanningTool ScanTool(Service, VFS);
+
+  std::vector<std::string> CommandLine0 = {"clang",
+                                           "-target",
+                                           "x86_64-apple-macosx10.7",
+                                           "-c",
+                                           "test0.cpp",
+                                           "-o"
+                                           "test0.cpp.o"};
+  std::vector<std::string> CommandLine1 = {"clang",
+                                           "-target",
+                                           "x86_64-apple-macosx10.7",
+                                           "-c",
+                                           "test1.cpp",
+                                           "-o"
+                                           "test1.cpp.o"};
+
+  std::string Result;
+  ASSERT_THAT_ERROR(
+      ScanTool.getDependencyFile(CommandLine0, CWD).moveInto(Result),
+      llvm::Succeeded());
+
+  VFS->addFile(HeaderPath, 0, llvm::MemoryBuffer::getMemBuffer(""));
+
+  ASSERT_THAT_ERROR(
+      ScanTool.getDependencyFile(CommandLine1, CWD).moveInto(Result),
+      llvm::Succeeded());
+}