whitepaper: 352/169 — wave4 MEDIUM (hadoop/hbase/nova/neutron/openstack) + fix odl-0002 dup

defects/cmake/patch/cmake-0004-addsource-unordered-set.patch

@@ -0,0 +1,28 @@
+diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
+index abc1234..def5678 100644
+--- a/Source/cmTarget.cxx
++++ b/Source/cmTarget.cxx
+@@ -1428,11 +1428,19 @@ cmSourceFile* cmTarget::AddSource(std::string const& src, bool before)
+ {
+   cmSourceFileLocation sfl(this->impl->Makefile, src,
+                            cmSourceFileLocationKind::Known);
++  // Fast path: check a parallel unordered_set of source-path strings.
++  // The full TargetPropertyEntryFinder scan is O(n) and is called from loops
++  // (e.g. Unity build file iteration), producing O(n^2) overall.
++  // An exact-string set lookup is O(1) amortized and covers the common case
++  // where src is a canonical resolved path.
++  if (!this->impl->SourcePathsSet.insert(src).second) {
++    // Already present — skip the expensive find_if and WriteDirect.
++    if (cmGeneratorExpression::Find(src) != std::string::npos)
++      return nullptr;
++    return this->impl->Makefile->GetOrCreateSource(
++      src, false, cmSourceFileLocationKind::Known);
++  }
+   auto const& sources = this->impl->Sources.Entries;
+   if (std::find_if(sources.begin(), sources.end(),
+                    TargetPropertyEntryFinder(sfl)) == sources.end()) {
+     this->impl->Sources.WriteDirect(
+       this->impl.get(), {}, cmValue(src),
+       before ? UsageRequirementProperty::Action::Prepend
+              : UsageRequirementProperty::Action::Append);
+   }