New experimental/undocumented feature: 'works_on_empty'.

[oota-llvm.git] / lib / CompilerDriver / CompilationGraph.cpp

diff --git a/lib/CompilerDriver/CompilationGraph.cpp b/lib/CompilerDriver/CompilationGraph.cpp
index 56e5b9ce076161d04d10ff97fb910b1b5b194dcc..a36d3fb692a7f9b6ce1a56b495d8104479fb8c54 100644 (file)
--- a/lib/CompilerDriver/CompilationGraph.cpp
+++ b/lib/CompilerDriver/CompilationGraph.cpp
@@ -33,9 +33,11 @@ using namespace llvmc;
 namespace llvmc {
 
   const std::string& LanguageMap::GetLanguage(const sys::Path& File) const {
-    LanguageMap::const_iterator Lang = this->find(File.getSuffix());
+    StringRef suf = File.getSuffix();
+    LanguageMap::const_iterator Lang = this->find(suf);
     if (Lang == this->end())
-      throw std::runtime_error(("Unknown suffix: " + File.getSuffix()).str());
+      throw std::runtime_error("File '" + File.str() +
+                                "' has unknown suffix '" + suf.str() + '\'');
     return Lang->second;
   }
 }
@@ -311,7 +313,7 @@ int CompilationGraph::Build (const sys::Path& TempDir,
     JoinTool* JT = &dynamic_cast<JoinTool&>(*CurNode->ToolPtr.getPtr());
 
     // Are there any files in the join list?
-    if (JT->JoinListEmpty())
+    if (JT->JoinListEmpty() && !(JT->WorksOnEmpty() && InputFilenames.empty()))
       continue;
 
     Action CurAction = JT->GenerateAction(CurNode->HasChildren(),