Cache context-independent includes on evaluation.

Generator expressions whose output depends on the configuration
now record that fact. The GetIncludeDirectories method can use
that result to cache the include directories for later calls.

GetIncludeDirectories is called multiple times for a target
for each configuration, so this should restore performance for
multi-config generators.

5 files changed, 66 insertions, 14 deletions

diff --git a/Source/cmGeneratorExpression.cxx b/Source/cmGeneratorExpression.cxx
index 78ae8f2..7add1bf 100644
--- a/Source/cmGeneratorExpression.cxx
+++ b/Source/cmGeneratorExpression.cxx
@@ -88,6 +88,7 @@ const char *cmCompiledGeneratorExpression::Evaluate(
   context.Config = config;
   context.Quiet = quiet;
   context.HadError = false;
+  context.HadContextSensitiveCondition = false;
   context.HeadTarget = headTarget;
   context.CurrentTarget = currentTarget ? currentTarget : headTarget;
   context.Backtrace = this->Backtrace;
@@ -109,6 +110,10 @@ const char *cmCompiledGeneratorExpression::Evaluate(
       break;
       }
     }
+  if (!context.HadError)
+    {
+    this->HadContextSensitiveCondition = context.HadContextSensitiveCondition;
+    }
 
   this->Targets = context.Targets;
   // TODO: Return a std::string from here instead?
@@ -118,7 +123,8 @@ const char *cmCompiledGeneratorExpression::Evaluate(
 cmCompiledGeneratorExpression::cmCompiledGeneratorExpression(
               cmListFileBacktrace const& backtrace,
               const char *input)
-  : Backtrace(backtrace), Input(input ? input : "")
+  : Backtrace(backtrace), Input(input ? input : ""),
+    HadContextSensitiveCondition(false)
 {
   cmGeneratorExpressionLexer l;
   std::vector<cmGeneratorExpressionToken> tokens =
diff --git a/Source/cmGeneratorExpression.h b/Source/cmGeneratorExpression.h
index 8f1aef6..700fe03 100644
--- a/Source/cmGeneratorExpression.h
+++ b/Source/cmGeneratorExpression.h
@@ -100,6 +100,10 @@ public:
   {
     return this->Backtrace;
   }
+  bool GetHadContextSensitiveCondition() const
+  {
+    return this->HadContextSensitiveCondition;
+  }
 
 private:
   cmCompiledGeneratorExpression(cmListFileBacktrace const& backtrace,
@@ -118,6 +122,7 @@ private:
   mutable std::set<cmTarget*> Targets;
   mutable std::map<cmStdString, cmStdString> SeenTargetProperties;
   mutable std::string Output;
+  mutable bool HadContextSensitiveCondition;
 };
 
 #endif
diff --git a/Source/cmGeneratorExpressionEvaluator.cxx b/Source/cmGeneratorExpressionEvaluator.cxx
index cd4b7d8..5d94718 100644
--- a/Source/cmGeneratorExpressionEvaluator.cxx
+++ b/Source/cmGeneratorExpressionEvaluator.cxx
@@ -238,6 +238,7 @@ static const struct ConfigurationNode : public cmGeneratorExpressionNode
                        const GeneratorExpressionContent *,
                        cmGeneratorExpressionDAGChecker *) const
   {
+    context->HadContextSensitiveCondition = true;
     return context->Config ? context->Config : "";
   }
 } configurationNode;
@@ -262,6 +263,7 @@ static const struct ConfigurationTestNode : public cmGeneratorExpressionNode
                   "Expression syntax not recognized.");
       return std::string();
       }
+    context->HadContextSensitiveCondition = true;
     if (!context->Config)
       {
       return parameters.front().empty() ? "1" : "0";
@@ -455,12 +457,14 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
         }
       if (propertyName == "POSITION_INDEPENDENT_CODE")
         {
+        context->HadContextSensitiveCondition = true;
         return target->GetLinkInterfaceDependentBoolProperty(
                     "POSITION_INDEPENDENT_CODE", context->Config) ? "1" : "0";
         }
       if (target->IsLinkInterfaceDependentBoolProperty(propertyName,
                                                        context->Config))
         {
+        context->HadContextSensitiveCondition = true;
         return target->GetLinkInterfaceDependentBoolProperty(
                                                 propertyName,
                                                 context->Config) ? "1" : "0";
@@ -468,6 +472,7 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
       if (target->IsLinkInterfaceDependentStringProperty(propertyName,
                                                          context->Config))
         {
+        context->HadContextSensitiveCondition = true;
         const char *propContent =
                               target->GetLinkInterfaceDependentStringProperty(
                                                 propertyName,
@@ -486,12 +491,19 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
       if (targetPropertyTransitiveWhitelist[i] == propertyName)
         {
         cmGeneratorExpression ge(context->Backtrace);
-        return ge.Parse(prop)->Evaluate(context->Makefile,
+        cmsys::auto_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(prop);
+        std::string result = cge->Evaluate(context->Makefile,
                             context->Config,
                             context->Quiet,
                             context->HeadTarget,
                             target,
                             &dagChecker);
+
+        if (cge->GetHadContextSensitiveCondition())
+          {
+          context->HadContextSensitiveCondition = true;
+          }
+        return result;
         }
       }
     return prop;
@@ -585,6 +597,9 @@ static const struct TargetPolicyNode : public cmGeneratorExpressionNode
           "be used with add_custom_command.");
       return std::string();
       }
+
+    context->HadContextSensitiveCondition = true;
+
     for (size_t i = 0;
          i < (sizeof(targetPolicyWhitelist) /
               sizeof(*targetPolicyWhitelist));
@@ -716,12 +731,18 @@ private:
       }
 
     cmGeneratorExpression ge(context->Backtrace);
-    return ge.Parse(propContent)->Evaluate(context->Makefile,
+    cmsys::auto_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(propContent);
+    std::string result = cge->Evaluate(context->Makefile,
                         context->Config,
                         context->Quiet,
                         context->HeadTarget,
                         target,
                         &dagChecker);
+    if (cge->GetHadContextSensitiveCondition())
+      {
+      context->HadContextSensitiveCondition = true;
+      }
+    return result;
   }
 
 } linkedNode;
diff --git a/Source/cmGeneratorExpressionEvaluator.h b/Source/cmGeneratorExpressionEvaluator.h
index fb6c7ee..37d5c86 100644
--- a/Source/cmGeneratorExpressionEvaluator.h
+++ b/Source/cmGeneratorExpressionEvaluator.h
@@ -32,6 +32,7 @@ struct cmGeneratorExpressionContext
                            // directly or indirectly in the property.
   bool Quiet;
   bool HadError;
+  bool HadContextSensitiveCondition;
 };
 
 struct cmGeneratorExpressionDAGChecker;
diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 5669872..1a6b7ce 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -134,6 +134,7 @@ public:
       : ge(cge)
     {}
     const cmsys::auto_ptr<cmCompiledGeneratorExpression> ge;
+    std::vector<std::string> CachedIncludes;
   };
   std::vector<IncludeDirectoriesEntry*> IncludeDirectoriesEntries;
 };
@@ -2778,22 +2779,36 @@ std::vector<std::string> cmTarget::GetIncludeDirectories(const char *config)
       end = this->Internal->IncludeDirectoriesEntries.end();
       it != end; ++it)
     {
-    std::vector<std::string> entryIncludes;
-    cmSystemTools::ExpandListArgument((*it)->ge->Evaluate(this->Makefile,
-                                              config,
-                                              false,
-                                              this,
-                                              &dagChecker),
-                                    entryIncludes);
+
+    bool testIsOff = true;
+    bool cacheIncludes = false;
+    std::vector<std::string> entryIncludes = (*it)->CachedIncludes;
+    if(!entryIncludes.empty())
+      {
+      testIsOff = false;
+      }
+    else
+      {
+      cmSystemTools::ExpandListArgument((*it)->ge->Evaluate(this->Makefile,
+                                                config,
+                                                false,
+                                                this,
+                                                &dagChecker),
+                                      entryIncludes);
+      if (!(*it)->ge->GetHadContextSensitiveCondition())
+        {
+        cacheIncludes = true;
+        }
+      }
     std::string usedIncludes;
-    for(std::vector<std::string>::const_iterator
+    for(std::vector<std::string>::iterator
           li = entryIncludes.begin(); li != entryIncludes.end(); ++li)
       {
-      std::string inc = *li;
-      if (!cmSystemTools::IsOff(inc.c_str()))
+      if (testIsOff && !cmSystemTools::IsOff(li->c_str()))
         {
-        cmSystemTools::ConvertToUnixSlashes(inc);
+        cmSystemTools::ConvertToUnixSlashes(*li);
         }
+      std::string inc = *li;
 
       if(uniqueIncludes.insert(inc).second)
         {
@@ -2804,6 +2819,10 @@ std::vector<std::string> cmTarget::GetIncludeDirectories(const char *config)
           }
         }
       }
+    if (cacheIncludes)
+      {
+      (*it)->CachedIncludes = entryIncludes;
+      }
     if (!usedIncludes.empty())
       {
       this->Makefile->GetCMakeInstance()->IssueMessage(cmake::LOG,