cmTarget: Fix buildsystem property empty value set and append operations

Refactoring in commit 1f54bc1c (cmTarget: Split storage of include
directories from genexes, 2015-08-04), commit 772ecef4 (cmTarget: Split
storage of compile options from genexes, 2015-08-04), commit 44e071ae
(cmTarget: Split storage of compile features from genexes, 2015-08-04),
and commit 197f4de1 (cmTarget: Split storage of compile definitions from
genexes, 2015-08-04) failed to account for value==NULL in SetProperty
and AppendProperty methods.

1 files changed, 48 insertions, 24 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 590654d..396715d 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -1601,33 +1601,45 @@ void cmTarget::SetProperty(const std::string& prop, const char* value)
     {
     this->Internal->IncludeDirectoriesEntries.clear();
     this->Internal->IncludeDirectoriesBacktraces.clear();
-    this->Internal->IncludeDirectoriesEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->IncludeDirectoriesBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->IncludeDirectoriesEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->IncludeDirectoriesBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_OPTIONS")
     {
     this->Internal->CompileOptionsEntries.clear();
     this->Internal->CompileOptionsBacktraces.clear();
-    this->Internal->CompileOptionsEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileOptionsBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileOptionsEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileOptionsBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_FEATURES")
     {
     this->Internal->CompileFeaturesEntries.clear();
     this->Internal->CompileFeaturesBacktraces.clear();
-    this->Internal->CompileFeaturesEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileFeaturesBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileFeaturesEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileFeaturesBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_DEFINITIONS")
     {
     this->Internal->CompileDefinitionsEntries.clear();
     this->Internal->CompileDefinitionsBacktraces.clear();
-    this->Internal->CompileDefinitionsEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileDefinitionsBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileDefinitionsEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileDefinitionsBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "EXPORT_NAME" && this->IsImported())
     {
@@ -1693,27 +1705,39 @@ void cmTarget::AppendProperty(const std::string& prop, const char* value,
     }
   else if(prop == "INCLUDE_DIRECTORIES")
     {
-    this->Internal->IncludeDirectoriesEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->IncludeDirectoriesBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->IncludeDirectoriesEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->IncludeDirectoriesBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_OPTIONS")
     {
-    this->Internal->CompileOptionsEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileOptionsBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileOptionsEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileOptionsBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_FEATURES")
     {
-    this->Internal->CompileFeaturesEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileFeaturesBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileFeaturesEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileFeaturesBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "COMPILE_DEFINITIONS")
     {
-    this->Internal->CompileDefinitionsEntries.push_back(value);
-    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-    this->Internal->CompileDefinitionsBacktraces.push_back(lfbt);
+    if (value)
+      {
+      this->Internal->CompileDefinitionsEntries.push_back(value);
+      cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+      this->Internal->CompileDefinitionsBacktraces.push_back(lfbt);
+      }
     }
   else if(prop == "EXPORT_NAME" && this->IsImported())
     {