[clang-scan-deps] Introduce the DependencyScanning library with the

thread worker code and better error handling

This commit extracts out the code that will powers the fast scanning
worker into a new file in a new DependencyScanning library. The error
and output handling is improved so that the clients can gather
errors/results from the worker directly.

Differential Revision: https://reviews.llvm.org/D63681

llvm-svn: 364474

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index a7c64866a48..291df0ae333 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -517,7 +517,8 @@ int ClangTool::run(ToolAction *Action) {
 
       if (!Invocation.run()) {
         // FIXME: Diagnostics should be used instead.
-        llvm::errs() << "Error while processing " << File << ".\n";
+        if (PrintErrorMessage)
+          llvm::errs() << "Error while processing " << File << ".\n";
         ProcessingFailed = true;
       }
     }
@@ -569,6 +570,10 @@ void ClangTool::setRestoreWorkingDir(bool RestoreCWD) {
   this->RestoreCWD = RestoreCWD;
 }
 
+void ClangTool::setPrintErrorMessage(bool PrintErrorMessage) {
+  this->PrintErrorMessage = PrintErrorMessage;
+}
+
 namespace clang {
 namespace tooling {