Performance: Add an index to Change cmLocalGenerator::GeneratorTargets.

Add an index to Change cmLocalGenerator::GeneratorTargets for faster lookup by
name.

Also changed a bunch of uses of cmLocalGenerator::GetGeneratorTargets() to take
const references instead of copying the vector.

Represent generator targets as a map (name -> target) to make name lookups more
efficient instead of looping through the entire vector to find the desired one.

14 files changed, 71 insertions, 57 deletions

diff --git a/Source/cmComputeTargetDepends.cxx b/Source/cmComputeTargetDepends.cxx
index ff19eac..8a3a671 100644
--- a/Source/cmComputeTargetDepends.cxx
+++ b/Source/cmComputeTargetDepends.cxx
@@ -161,7 +161,7 @@ void cmComputeTargetDepends::CollectTargets()
   std::vector<cmLocalGenerator*> const& lgens =
     this->GlobalGenerator->GetLocalGenerators();
   for (unsigned int i = 0; i < lgens.size(); ++i) {
-    const std::vector<cmGeneratorTarget*> targets =
+    const std::vector<cmGeneratorTarget*>& targets =
       lgens[i]->GetGeneratorTargets();
     for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ++ti) {
diff --git a/Source/cmExtraCodeBlocksGenerator.cxx b/Source/cmExtraCodeBlocksGenerator.cxx
index 5b7b827..e7a8975 100644
--- a/Source/cmExtraCodeBlocksGenerator.cxx
+++ b/Source/cmExtraCodeBlocksGenerator.cxx
@@ -296,8 +296,9 @@ void cmExtraCodeBlocksGenerator::CreateNewProjectFile(
   // and UTILITY targets
   for (std::vector<cmLocalGenerator*>::const_iterator lg = lgs.begin();
        lg != lgs.end(); lg++) {
-    std::vector<cmGeneratorTarget*> targets = (*lg)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lg)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ti++) {
       std::string targetName = (*ti)->GetName();
       switch ((*ti)->GetType()) {
@@ -359,8 +360,9 @@ void cmExtraCodeBlocksGenerator::CreateNewProjectFile(
   for (std::vector<cmLocalGenerator*>::const_iterator lg = lgs.begin();
        lg != lgs.end(); lg++) {
     cmMakefile* makefile = (*lg)->GetMakefile();
-    std::vector<cmGeneratorTarget*> targets = (*lg)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lg)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ti++) {
       switch ((*ti)->GetType()) {
         case cmStateEnums::EXECUTABLE:
diff --git a/Source/cmExtraCodeLiteGenerator.cxx b/Source/cmExtraCodeLiteGenerator.cxx
index b478f34..96502d5 100644
--- a/Source/cmExtraCodeLiteGenerator.cxx
+++ b/Source/cmExtraCodeLiteGenerator.cxx
@@ -292,8 +292,9 @@ void cmExtraCodeLiteGenerator::CreateNewProjectFile(
   for (std::vector<cmLocalGenerator*>::const_iterator lg = lgs.begin();
        lg != lgs.end(); lg++) {
     cmMakefile* makefile = (*lg)->GetMakefile();
-    std::vector<cmGeneratorTarget*> targets = (*lg)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lg)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ti++) {
       projectType = CollectSourceFiles(makefile, *ti, cFiles, otherFiles);
     }
diff --git a/Source/cmExtraEclipseCDT4Generator.cxx b/Source/cmExtraEclipseCDT4Generator.cxx
index 2a6ce98..473af37 100644
--- a/Source/cmExtraEclipseCDT4Generator.cxx
+++ b/Source/cmExtraEclipseCDT4Generator.cxx
@@ -475,7 +475,7 @@ void cmExtraEclipseCDT4Generator::CreateLinksForTargets(cmXMLWriter& xml)
          this->GlobalGenerator->GetLocalGenerators().begin();
        lgIt != this->GlobalGenerator->GetLocalGenerators().end(); ++lgIt) {
     cmMakefile* makefile = (*lgIt)->GetMakefile();
-    const std::vector<cmGeneratorTarget*> targets =
+    const std::vector<cmGeneratorTarget*>& targets =
       (*lgIt)->GetGeneratorTargets();
 
     for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
@@ -853,8 +853,9 @@ void cmExtraEclipseCDT4Generator::CreateCProjectFile() const
   for (std::vector<cmLocalGenerator*>::const_iterator it =
          this->GlobalGenerator->GetLocalGenerators().begin();
        it != this->GlobalGenerator->GetLocalGenerators().end(); ++it) {
-    std::vector<cmGeneratorTarget*> targets = (*it)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator l = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*it)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator l = targets.begin();
          l != targets.end(); ++l) {
       std::vector<std::string> includeDirs;
       std::string config = mf->GetSafeDefinition("CMAKE_BUILD_TYPE");
@@ -910,7 +911,7 @@ void cmExtraEclipseCDT4Generator::CreateCProjectFile() const
   for (std::vector<cmLocalGenerator*>::const_iterator it =
          this->GlobalGenerator->GetLocalGenerators().begin();
        it != this->GlobalGenerator->GetLocalGenerators().end(); ++it) {
-    const std::vector<cmGeneratorTarget*> targets =
+    const std::vector<cmGeneratorTarget*>& targets =
       (*it)->GetGeneratorTargets();
     std::string subdir = (*it)->ConvertToRelativePath(
       this->HomeOutputDirectory, (*it)->GetCurrentBinaryDirectory());
diff --git a/Source/cmExtraKateGenerator.cxx b/Source/cmExtraKateGenerator.cxx
index 3730433..e366774 100644
--- a/Source/cmExtraKateGenerator.cxx
+++ b/Source/cmExtraKateGenerator.cxx
@@ -115,7 +115,7 @@ void cmExtraKateGenerator::WriteTargets(const cmLocalGenerator* lg,
   for (std::vector<cmLocalGenerator*>::const_iterator it =
          this->GlobalGenerator->GetLocalGenerators().begin();
        it != this->GlobalGenerator->GetLocalGenerators().end(); ++it) {
-    const std::vector<cmGeneratorTarget*> targets =
+    const std::vector<cmGeneratorTarget*>& targets =
       (*it)->GetGeneratorTargets();
     std::string currentDir = (*it)->GetCurrentBinaryDirectory();
     bool topLevel = (currentDir == (*it)->GetBinaryDirectory());
diff --git a/Source/cmExtraSublimeTextGenerator.cxx b/Source/cmExtraSublimeTextGenerator.cxx
index 1fd1418..a62a546 100644
--- a/Source/cmExtraSublimeTextGenerator.cxx
+++ b/Source/cmExtraSublimeTextGenerator.cxx
@@ -185,8 +185,9 @@ void cmExtraSublimeTextGenerator::AppendAllTargets(
   for (std::vector<cmLocalGenerator*>::const_iterator lg = lgs.begin();
        lg != lgs.end(); lg++) {
     cmMakefile* makefile = (*lg)->GetMakefile();
-    std::vector<cmGeneratorTarget*> targets = (*lg)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lg)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ti++) {
       std::string targetName = (*ti)->GetName();
       switch ((*ti)->GetType()) {
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 18d10c5..85ba5ee 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -2594,9 +2594,9 @@ void cmGlobalGenerator::GetTargetSets(TargetDependSet& projectTargets,
       continue;
     }
     // Get the targets in the makefile
-    std::vector<cmGeneratorTarget*> tgts = (*i)->GetGeneratorTargets();
+    const std::vector<cmGeneratorTarget*>& tgts = (*i)->GetGeneratorTargets();
     // loop over all the targets
-    for (std::vector<cmGeneratorTarget*>::iterator l = tgts.begin();
+    for (std::vector<cmGeneratorTarget*>::const_iterator l = tgts.begin();
          l != tgts.end(); ++l) {
       cmGeneratorTarget* target = *l;
       if (this->IsRootOnlyTarget(target) &&
@@ -2789,9 +2789,9 @@ void cmGlobalGenerator::WriteSummary()
   cmGeneratedFileStream fout(fname.c_str());
 
   for (unsigned int i = 0; i < this->LocalGenerators.size(); ++i) {
-    std::vector<cmGeneratorTarget*> tgts =
+    const std::vector<cmGeneratorTarget*>& tgts =
       this->LocalGenerators[i]->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator it = tgts.begin();
+    for (std::vector<cmGeneratorTarget*>::const_iterator it = tgts.begin();
          it != tgts.end(); ++it) {
       if ((*it)->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
         continue;
diff --git a/Source/cmGlobalKdevelopGenerator.cxx b/Source/cmGlobalKdevelopGenerator.cxx
index e72c6e3..85a1417 100644
--- a/Source/cmGlobalKdevelopGenerator.cxx
+++ b/Source/cmGlobalKdevelopGenerator.cxx
@@ -128,8 +128,9 @@ bool cmGlobalKdevelopGenerator::CreateFilelistFile(
     }
 
     // get all sources
-    std::vector<cmGeneratorTarget*> targets = (*it)->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*it)->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
          ti != targets.end(); ti++) {
       std::vector<cmSourceFile*> sources;
       cmGeneratorTarget* gt = *ti;
diff --git a/Source/cmGlobalUnixMakefileGenerator3.cxx b/Source/cmGlobalUnixMakefileGenerator3.cxx
index 23b3718..e42bf20 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.cxx
+++ b/Source/cmGlobalUnixMakefileGenerator3.cxx
@@ -382,8 +382,8 @@ void cmGlobalUnixMakefileGenerator3::WriteMainCMakefileLanguageRules(
   for (unsigned int i = 0; i < lGenerators.size(); ++i) {
     lg = static_cast<cmLocalUnixMakefileGenerator3*>(lGenerators[i]);
     // for all of out targets
-    std::vector<cmGeneratorTarget*> tgts = lg->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator l = tgts.begin();
+    const std::vector<cmGeneratorTarget*>& tgts = lg->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator l = tgts.begin();
          l != tgts.end(); l++) {
       if (((*l)->GetType() == cmStateEnums::EXECUTABLE) ||
           ((*l)->GetType() == cmStateEnums::STATIC_LIBRARY) ||
@@ -414,8 +414,8 @@ void cmGlobalUnixMakefileGenerator3::WriteDirectoryRule2(
   // The directory-level rule should depend on the target-level rules
   // for all targets in the directory.
   std::vector<std::string> depends;
-  std::vector<cmGeneratorTarget*> targets = lg->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator l = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = lg->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator l = targets.begin();
        l != targets.end(); ++l) {
     cmGeneratorTarget* gtarget = *l;
     int type = gtarget->GetType();
@@ -547,8 +547,8 @@ void cmGlobalUnixMakefileGenerator3::WriteConvenienceRules(
   for (i = 0; i < this->LocalGenerators.size(); ++i) {
     lg = static_cast<cmLocalUnixMakefileGenerator3*>(this->LocalGenerators[i]);
     // for each target Generate the rule files for each target.
-    std::vector<cmGeneratorTarget*> targets = lg->GetGeneratorTargets();
-    for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+    const std::vector<cmGeneratorTarget*>& targets = lg->GetGeneratorTargets();
+    for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
          t != targets.end(); ++t) {
       cmGeneratorTarget* gtarget = *t;
       // Don't emit the same rule twice (e.g. two targets with the same
@@ -629,8 +629,8 @@ void cmGlobalUnixMakefileGenerator3::WriteConvenienceRules2(
   depends.push_back("cmake_check_build_system");
 
   // for each target Generate the rule files for each target.
-  std::vector<cmGeneratorTarget*> targets = lg->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = lg->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     cmGeneratorTarget* gtarget = *t;
     int type = gtarget->GetType();
@@ -807,7 +807,7 @@ void cmGlobalUnixMakefileGenerator3::InitializeProgressMarks()
          this->LocalGenerators.begin();
        lgi != this->LocalGenerators.end(); ++lgi) {
     cmLocalGenerator* lg = *lgi;
-    std::vector<cmGeneratorTarget*> targets = lg->GetGeneratorTargets();
+    const std::vector<cmGeneratorTarget*>& targets = lg->GetGeneratorTargets();
     for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
          t != targets.end(); ++t) {
       cmGeneratorTarget* gt = *t;
@@ -952,8 +952,9 @@ void cmGlobalUnixMakefileGenerator3::WriteHelpRule(
     // the targets
     if (lg2 == lg || lg->IsRootMakefile()) {
       // for each target Generate the rule files for each target.
-      std::vector<cmGeneratorTarget*> targets = lg2->GetGeneratorTargets();
-      for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+      const std::vector<cmGeneratorTarget*>& targets =
+        lg2->GetGeneratorTargets();
+      for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
            t != targets.end(); ++t) {
         cmGeneratorTarget* target = *t;
         cmStateEnums::TargetType type = target->GetType();
diff --git a/Source/cmGraphVizWriter.cxx b/Source/cmGraphVizWriter.cxx
index 7e953ce..015f887 100644
--- a/Source/cmGraphVizWriter.cxx
+++ b/Source/cmGraphVizWriter.cxx
@@ -420,7 +420,8 @@ int cmGraphVizWriter::CollectAllTargets()
   for (std::vector<cmLocalGenerator*>::const_iterator lit =
          this->LocalGenerators.begin();
        lit != this->LocalGenerators.end(); ++lit) {
-    std::vector<cmGeneratorTarget*> targets = (*lit)->GetGeneratorTargets();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lit)->GetGeneratorTargets();
     for (std::vector<cmGeneratorTarget*>::const_iterator it = targets.begin();
          it != targets.end(); ++it) {
       const char* realTargetName = (*it)->GetName().c_str();
@@ -445,7 +446,8 @@ int cmGraphVizWriter::CollectAllExternalLibs(int cnt)
   for (std::vector<cmLocalGenerator*>::const_iterator lit =
          this->LocalGenerators.begin();
        lit != this->LocalGenerators.end(); ++lit) {
-    std::vector<cmGeneratorTarget*> targets = (*lit)->GetGeneratorTargets();
+    const std::vector<cmGeneratorTarget*>& targets =
+      (*lit)->GetGeneratorTargets();
     for (std::vector<cmGeneratorTarget*>::const_iterator it = targets.begin();
          it != targets.end(); ++it) {
       const char* realTargetName = (*it)->GetName().c_str();
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 2c5db10..2c8157e 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -214,8 +214,8 @@ void cmLocalGenerator::TraceDependencies()
     this->GlobalGenerator->CreateEvaluationSourceFiles(*ci);
   }
   // Generate the rule files for each target.
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     if ((*t)->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
       continue;
@@ -548,6 +548,8 @@ void cmLocalGenerator::GenerateInstallRules()
 void cmLocalGenerator::AddGeneratorTarget(cmGeneratorTarget* gt)
 {
   this->GeneratorTargets.push_back(gt);
+  this->GeneratorTargetSearchIndex.insert(
+    std::pair<std::string, cmGeneratorTarget*>(gt->GetName(), gt));
   this->GlobalGenerator->IndexGeneratorTarget(gt);
 }
 
@@ -581,11 +583,10 @@ private:
 cmGeneratorTarget* cmLocalGenerator::FindLocalNonAliasGeneratorTarget(
   const std::string& name) const
 {
-  std::vector<cmGeneratorTarget*>::const_iterator ti =
-    std::find_if(this->GeneratorTargets.begin(), this->GeneratorTargets.end(),
-                 NamedGeneratorTargetFinder(name));
-  if (ti != this->GeneratorTargets.end()) {
-    return *ti;
+  GeneratorTargetMap::const_iterator ti =
+    this->GeneratorTargetSearchIndex.find(name);
+  if (ti != this->GeneratorTargetSearchIndex.end()) {
+    return ti->second;
   }
   return CM_NULLPTR;
 }
@@ -600,8 +601,8 @@ void cmLocalGenerator::ComputeTargetManifest()
   }
 
   // Add our targets to the manifest for each configuration.
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     cmGeneratorTarget* target = *t;
     if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
@@ -625,8 +626,8 @@ bool cmLocalGenerator::ComputeTargetCompileFeatures()
   }
 
   // Process compile features of all targets.
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     cmGeneratorTarget* target = *t;
     for (std::vector<std::string>::iterator ci = configNames.begin();
@@ -2121,8 +2122,8 @@ void cmLocalGenerator::GenerateTargetInstallRules(
 {
   // Convert the old-style install specification from each target to
   // an install generator and run it.
-  std::vector<cmGeneratorTarget*> tgts = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator l = tgts.begin();
+  const std::vector<cmGeneratorTarget*>& tgts = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator l = tgts.begin();
        l != tgts.end(); ++l) {
     if ((*l)->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
       continue;
diff --git a/Source/cmLocalGenerator.h b/Source/cmLocalGenerator.h
index 9f78be4..9083c83 100644
--- a/Source/cmLocalGenerator.h
+++ b/Source/cmLocalGenerator.h
@@ -16,6 +16,7 @@
 #include "cmOutputConverter.h"
 #include "cmPolicies.h"
 #include "cmStateSnapshot.h"
+#include "cm_unordered_map.hxx"
 #include "cmake.h"
 
 class cmComputeLinkInformation;
@@ -353,8 +354,11 @@ protected:
   std::string::size_type ObjectPathMax;
   std::set<std::string> ObjectMaxPathViolations;
 
-  std::set<cmGeneratorTarget const*> WarnCMP0063;
+  typedef CM_UNORDERED_MAP<std::string, cmGeneratorTarget*> GeneratorTargetMap;
+  GeneratorTargetMap GeneratorTargetSearchIndex;
   std::vector<cmGeneratorTarget*> GeneratorTargets;
+
+  std::set<cmGeneratorTarget const*> WarnCMP0063;
   std::vector<cmGeneratorTarget*> ImportedGeneratorTargets;
   std::vector<cmGeneratorTarget*> OwnedImportedGeneratorTargets;
   std::map<std::string, std::string> AliasTargets;
diff --git a/Source/cmLocalNinjaGenerator.cxx b/Source/cmLocalNinjaGenerator.cxx
index 266710c..9fa3ca5 100644
--- a/Source/cmLocalNinjaGenerator.cxx
+++ b/Source/cmLocalNinjaGenerator.cxx
@@ -79,8 +79,8 @@ void cmLocalNinjaGenerator::Generate()
     }
   }
 
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     if ((*t)->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
       continue;
diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index 9b9d22c..2d10021 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -116,10 +116,10 @@ void cmLocalUnixMakefileGenerator3::Generate()
     this->Makefile->IsOn("CMAKE_SKIP_ASSEMBLY_SOURCE_RULES");
 
   // Generate the rule files for each target.
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
   cmGlobalUnixMakefileGenerator3* gg =
     static_cast<cmGlobalUnixMakefileGenerator3*>(this->GlobalGenerator);
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     if ((*t)->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
       continue;
@@ -172,8 +172,8 @@ void cmLocalUnixMakefileGenerator3::ComputeObjectFilenames(
 void cmLocalUnixMakefileGenerator3::GetLocalObjectFiles(
   std::map<std::string, LocalObjectInfo>& localObjectFiles)
 {
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  for (std::vector<cmGeneratorTarget*>::iterator ti = targets.begin();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  for (std::vector<cmGeneratorTarget*>::const_iterator ti = targets.begin();
        ti != targets.end(); ++ti) {
     cmGeneratorTarget* gt = *ti;
     if (gt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
@@ -382,9 +382,9 @@ void cmLocalUnixMakefileGenerator3::WriteLocalMakefileTargets(
 
   // for each target we just provide a rule to cd up to the top and do a make
   // on the target
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
   std::string localName;
-  for (std::vector<cmGeneratorTarget*>::iterator t = targets.begin();
+  for (std::vector<cmGeneratorTarget*>::const_iterator t = targets.begin();
        t != targets.end(); ++t) {
     if (((*t)->GetType() == cmStateEnums::EXECUTABLE) ||
         ((*t)->GetType() == cmStateEnums::STATIC_LIBRARY) ||
@@ -1562,8 +1562,8 @@ void cmLocalUnixMakefileGenerator3::WriteLocalAllRules(
   this->WriteDivider(ruleFileStream);
   ruleFileStream << "# Targets provided globally by CMake.\n"
                  << "\n";
-  std::vector<cmGeneratorTarget*> targets = this->GetGeneratorTargets();
-  std::vector<cmGeneratorTarget*>::iterator glIt;
+  const std::vector<cmGeneratorTarget*>& targets = this->GetGeneratorTargets();
+  std::vector<cmGeneratorTarget*>::const_iterator glIt;
   for (glIt = targets.begin(); glIt != targets.end(); ++glIt) {
     if ((*glIt)->GetType() == cmStateEnums::GLOBAL_TARGET) {
       std::string targetString =