ENH: support unset of properties

Source/cmGetPropertyCommand.cxx

@@ -94,6 +94,11 @@ bool cmGetPropertyCommand
       doing = DoingNone;
       this->InfoType = OutFullDoc;
       }
+    else if(args[i] == "SET")
+      {
+      doing = DoingNone;
+      this->InfoType = OutSet;
+      }
     else if(args[i] == "DEFINED")
       {
       doing = DoingNone;
@@ -158,6 +163,20 @@ bool cmGetPropertyCommand
       }
     this->Makefile->AddDefinition(this->Variable.c_str(), output.c_str());
     }
+  else if(this->InfoType == OutDefined)
+    {
+    // Lookup if the property is defined
+    const char *value;
+    if(this->Makefile->GetCMakeInstance()->
+       GetPropertyDefinition(this->PropertyName.c_str(), scope))
+      {
+      this->Makefile->AddDefinition(this->Variable.c_str(), "1");
+      }
+    else
+      {
+      this->Makefile->AddDefinition(this->Variable.c_str(), "0");
+      }
+    }
   else
     {
     // Dispatch property getting.
@@ -181,7 +200,7 @@ bool cmGetPropertyCommand
 //----------------------------------------------------------------------------
 bool cmGetPropertyCommand::StoreResult(const char* value)
 {
-  if(this->InfoType == OutDefined)
+  if(this->InfoType == OutSet)
     {
     this->Makefile->AddDefinition(this->Variable.c_str(), value? "1":"0");
     }

Source/cmGetPropertyCommand.h

@@ -68,7 +68,7 @@ public:
         "                TEST      <test>   |\n"
         "                VARIABLE>\n"
         "               PROPERTY <name>\n"
-        "               [DEFINED | BRIEF_DOCS | FULL_DOCS])\n"
+        "               [SET | DEFINED | BRIEF_DOCS | FULL_DOCS])\n"
         "Get one property from one object in a scope.  "
         "The first argument specifies the variable in which to store the "
         "result.  "
@@ -85,8 +85,11 @@ public:
         "The required PROPERTY option is immediately followed by the name "
         "of the property to get.  "
         "If the property is not set an empty value is returned.  "
+        "If the SET option is given the variable is set to a boolean "
+        "value indicating whether the property has been set."
         "If the DEFINED option is given the variable is set to a boolean "
-        "value indicating whether the property has been set.  "
+        "value indicating whether the property has been defined "
+        "such as with define_property. "
         "If BRIEF_DOCS or FULL_DOCS is given then the variable is set to "
         "a string containing documentation for the requested property.  "
         "If documentation is requested for a property that has not been "
@@ -95,7 +98,7 @@ public:
   
   cmTypeMacro(cmGetPropertyCommand, cmCommand);
 private:
-  enum OutType { OutValue, OutDefined, OutBriefDoc, OutFullDoc };
+  enum OutType { OutValue, OutDefined, OutBriefDoc, OutFullDoc, OutSet };
   std::string Variable;
   std::string Name;
   std::string PropertyName;

Source/cmSetPropertyCommand.cxx

@@ -23,6 +23,7 @@
 cmSetPropertyCommand::cmSetPropertyCommand()
 {
   this->AppendMode = false;
+  this->Remove = true;
 }
 
 //----------------------------------------------------------------------------
@@ -96,6 +97,7 @@ bool cmSetPropertyCommand
       this->PropertyValue += sep;
       sep = ";";
       this->PropertyValue += *arg;
+      this->Remove = false;
       }
     else
       {
@@ -141,13 +143,18 @@ bool cmSetPropertyCommand::HandleGlobalMode()
   // Set or append the property.
   cmake* cm = this->Makefile->GetCMakeInstance();
   const char* name = this->PropertyName.c_str();
+  const char *value = this->PropertyValue.c_str();
+  if (this->Remove)
+    {
+    value = 0;
+    }
   if(this->AppendMode)
     {
-    cm->AppendProperty(name, this->PropertyValue.c_str());
+    cm->AppendProperty(name, value);
     }
   else
     {
-    cm->SetProperty(name, this->PropertyValue.c_str());
+    cm->SetProperty(name, value);
     }
 
   return true;
@@ -202,13 +209,18 @@ bool cmSetPropertyCommand::HandleDirectoryMode()
 
   // Set or append the property.
   const char* name = this->PropertyName.c_str();
+  const char *value = this->PropertyValue.c_str();
+  if (this->Remove)
+    {
+    value = 0;
+    }
   if(this->AppendMode)
     {
-    mf->AppendProperty(name, this->PropertyValue.c_str());
+    mf->AppendProperty(name, value);
     }
   else
     {
-    mf->SetProperty(name, this->PropertyValue.c_str());
+    mf->SetProperty(name, value);
     }
 
   return true;
@@ -245,13 +257,18 @@ bool cmSetPropertyCommand::HandleTarget(cmTarget* target)
 {
   // Set or append the property.
   const char* name = this->PropertyName.c_str();
+  const char *value = this->PropertyValue.c_str();
+  if (this->Remove)
+    {
+    value = 0;
+    }
   if(this->AppendMode)
     {
-    target->AppendProperty(name, this->PropertyValue.c_str());
+    target->AppendProperty(name, value);
     }
   else
     {
-    target->SetProperty(name, this->PropertyValue.c_str());
+    target->SetProperty(name, value);
     }
 
   return true;
@@ -287,13 +304,19 @@ bool cmSetPropertyCommand::HandleSource(cmSourceFile* sf)
 {
   // Set or append the property.
   const char* name = this->PropertyName.c_str();
+  const char *value = this->PropertyValue.c_str();
+  if (this->Remove)
+    {
+    value = 0;
+    }
+
   if(this->AppendMode)
     {
-    sf->AppendProperty(name, this->PropertyValue.c_str());
+    sf->AppendProperty(name, value);
     }
   else
     {
-    sf->SetProperty(name, this->PropertyValue.c_str());
+    sf->SetProperty(name, value);
     }
   return true;
 }
@@ -343,13 +366,18 @@ bool cmSetPropertyCommand::HandleTest(cmTest* test)
 {
   // Set or append the property.
   const char* name = this->PropertyName.c_str();
+  const char *value = this->PropertyValue.c_str();
+  if (this->Remove)
+    {
+    value = 0;
+    }
   if(this->AppendMode)
     {
-    test->AppendProperty(name, this->PropertyValue.c_str());
+    test->AppendProperty(name, value);
     }
   else
     {
-    test->SetProperty(name, this->PropertyValue.c_str());
+    test->SetProperty(name, value);
     }
 
   return true;

Source/cmSetPropertyCommand.h

@@ -92,6 +92,7 @@ private:
   std::set<cmStdString> Names;
   std::string PropertyName;
   std::string PropertyValue;
+  bool Remove;
   bool AppendMode;
 
   // Implementation of each property type.

Source/cmSourceFile.cxx

@@ -262,10 +262,6 @@ void cmSourceFile::SetProperty(const char* prop, const char* value)
     {
     return;
     }
-  if (!value)
-    {
-    value = "NOTFOUND";
-    }
 
   this->Properties.SetProperty(prop, value, cmProperty::SOURCE_FILE);
 }

Source/cmTarget.cxx

@@ -1591,10 +1591,6 @@ void cmTarget::SetProperty(const char* prop, const char* value)
     {
     return;
     }
-  if (!value)
-    {
-    value = "NOTFOUND";
-    }
 
   this->Properties.SetProperty(prop, value, cmProperty::TARGET);
 

Source/cmTest.cxx

@@ -76,10 +76,6 @@ void cmTest::SetProperty(const char* prop, const char* value)
     {
     return;
     }
-  if (!value)
-    {
-    value = "NOTFOUND";
-    }
 
   this->Properties.SetProperty(prop, value, cmProperty::TEST);
 }

Tests/Properties/CMakeLists.txt

@@ -23,10 +23,23 @@ include_directories("${Properties_SOURCE_DIR}" "${Properties_BINARY_DIR}")
 
 
 # test generic property interfaces
+get_property(GLOBALRESULT GLOBAL PROPERTY GLOBALTEST DEFINED)
+if (GLOBALRESULT)
+    message(SEND_ERROR "Error: global prop defined when it should not be, "
+            "result is GLOBALRESULT=${GLOBALRESULT}")
+endif (GLOBALRESULT)
+
 define_property(GLOBAL PROPERTY GLOBALTEST
   BRIEF_DOCS "A test property"
   FULL_DOCS "A long description of this test property"
   )
+
+get_property(GLOBALRESULT GLOBAL PROPERTY GLOBALTEST DEFINED)
+if (NOT GLOBALRESULT)
+    message(SEND_ERROR "Error: global prop not defined "
+            "result is GLOBALRESULT=${GLOBALRESULT}")
+endif (NOT GLOBALRESULT)
+  
 set_property(GLOBAL PROPERTY GLOBALTEST 1)
 set_property(DIRECTORY PROPERTY DIRECTORYTEST 1)
 set_property(SOURCE SubDir/properties3.cxx PROPERTY SOURCETEST 1)
@@ -42,7 +55,8 @@ if (RESULT1 AND RESULT2 AND RESULT3 AND GLOBALRESULT AND
   add_executable (Properties SubDir/properties3.cxx properties)
 else (RESULT1 AND RESULT2 AND RESULT3 AND GLOBALRESULT AND 
     DIRECTORYRESULT AND SOURCERESULT)
-  message("Error: test results are RESULT1=${RESULT1} RESULT2=${RESULT2} "
+  message(SEND_ERROR 
+    "Error: test results are RESULT1=${RESULT1} RESULT2=${RESULT2} "
     "RESULT3=${RESULT3} GLOBALRESULT=${GLOBALRESULT} "
     "DIRECTORYRESULT=${DIRECTORYRESULT} "
     "SOURCERESULT=${SOURCERESULT}")
@@ -53,15 +67,33 @@ endif (RESULT1 AND RESULT2 AND RESULT3 AND GLOBALRESULT AND
 set_property(TARGET Properties PROPERTY TARGETTEST 1)
 get_property(TARGETRESULT TARGET Properties PROPERTY TARGETTEST)
 if (NOT TARGETRESULT)
-    message("Error: target result is TARGETRESULT=${TARGETRESULT}")
+    message(SEND_ERROR 
+      "Error: target result is TARGETRESULT=${TARGETRESULT}")
 endif (NOT TARGETRESULT)
 
+# test get_property SET
+get_property(TARGETRESULT TARGET Properties PROPERTY TARGETTEST SET)
+if (NOT TARGETRESULT)
+    message(SEND_ERROR 
+      "Error: target prop not set, result is TARGETRESULT=${TARGETRESULT}")
+endif (NOT TARGETRESULT)
+
+# test unsetting a property
+set_property(TARGET Properties PROPERTY TARGETTEST)
+get_property(TARGETRESULT TARGET Properties PROPERTY TARGETTEST SET)
+if (TARGETRESULT)
+    message(SEND_ERROR "Error: target prop not unset, "
+            "result is TARGETRESULT=${TARGETRESULT}")
+endif (TARGETRESULT)
+
+
+
 # test the target SOURCES property
 get_property(Properties_SOURCES TARGET Properties PROPERTY SOURCES)
 set_source_files_properties(${Properties_SOURCES} PROPERTIES TEST4 1)
 get_source_file_property(RESULT4 properties.h TEST4)
 if(NOT RESULT4)
-  message("Error: target result is"
+  message(SEND_ERROR "Error: target result is"
     " RESULT4=${RESULT4}"
     " Properties_SOURCES=[${Properties_SOURCES}]")
 endif(NOT RESULT4)