Index: include/clang-c/Index.h
===================================================================
--- include/clang-c/Index.h
+++ include/clang-c/Index.h
@@ -627,6 +627,15 @@
                                                          CXFile file);
 
 /**
+ * \brief Retrieve all ranges from all files that were skipped by the
+ * preprocessor.
+ *
+ * The preprocessor will skip lines when they are surrounded by an
+ * if/ifdef/ifndef directive whose condition does not evaluate to true.
+ */
+CINDEX_LINKAGE CXSourceRangeList *clang_getAllSkippedRanges(CXTranslationUnit tu);
+
+/**
  * \brief Destroy the given \c CXSourceRangeList.
  */
 CINDEX_LINKAGE void clang_disposeSourceRangeList(CXSourceRangeList *ranges);
Index: tools/libclang/CIndex.cpp
===================================================================
--- tools/libclang/CIndex.cpp
+++ tools/libclang/CIndex.cpp
@@ -7680,6 +7680,33 @@
   return skipped;
 }
 
+CXSourceRangeList *clang_getAllSkippedRanges(CXTranslationUnit TU) {
+  CXSourceRangeList *skipped = new CXSourceRangeList;
+  skipped->count = 0;
+  skipped->ranges = nullptr;
+
+  if (isNotUsableTU(TU)) {
+    LOG_BAD_TU(TU);
+    return skipped;
+  }
+    
+  ASTUnit *astUnit = cxtu::getASTUnit(TU);
+  PreprocessingRecord *ppRec = astUnit->getPreprocessor().getPreprocessingRecord();
+  if (!ppRec)
+    return skipped;
+
+  ASTContext &Ctx = astUnit->getASTContext();
+
+  const std::vector<SourceRange> &SkippedRanges = ppRec->getSkippedRanges();
+
+  skipped->count = SkippedRanges.size();
+  skipped->ranges = new CXSourceRange[skipped->count];
+  for (unsigned i = 0, ei = skipped->count; i != ei; ++i)
+    skipped->ranges[i] = cxloc::translateSourceRange(Ctx, SkippedRanges[i]);
+
+  return skipped;
+}
+
 void clang_disposeSourceRangeList(CXSourceRangeList *ranges) {
   if (ranges) {
     delete[] ranges->ranges;