some mods to the plugin API

Source/cmCPluginAPI.cxx

@@ -35,6 +35,15 @@ void cmSetClientData(void *info, void *cd)
   ((cmLoadedCommandInfo *)info)->ClientData = cd;
 }
 
+void cmSetError(void *info, const char *err)
+{
+  if (((cmLoadedCommandInfo *)info)->Error)
+    {
+    free(((cmLoadedCommandInfo *)info)->Error);
+    }
+  ((cmLoadedCommandInfo *)info)->Error = strdup(err);
+}
+
 unsigned int cmGetCacheMajorVersion(void *arg)
 {
   cmMakefile *mf = static_cast<cmMakefile *>(arg);
@@ -461,50 +470,51 @@ void cmRemoveFile(const char *name)
 cmCAPI cmStaticCAPI =
 {
   cmGetClientData,
-    cmGetTotalArgumentSize,
-    cmFreeArguments,
-    cmSetClientData,
-    cmAddCacheDefinition,
-    cmAddCustomCommand,
-    cmAddDefineFlag,
-    cmAddDefinition,
-    cmAddExecutable,
-    cmAddLibrary,
-    cmAddLinkDirectoryForTarget,
-    cmAddLinkLibraryForTarget,
-    cmAddUtilityCommand,
-    cmCommandExists,
-    cmExecuteCommand,
-    cmExpandSourceListArguments,
-    cmExpandVariablesInString,
-    cmGetCacheMajorVersion,
-    cmGetCacheMinorVersion,
-    cmGetCurrentDirectory,
-    cmGetCurrentOutputDirectory,
-    cmGetDefinition,
-    cmGetHomeDirectory,
-    cmGetHomeOutputDirectory,
-    cmGetMajorVersion,
-    cmGetMinorVersion,
-    cmGetProjectName,
-    cmGetStartDirectory,
-    cmGetStartOutputDirectory,
-    cmIsOn,
+  cmGetTotalArgumentSize,
+  cmFreeArguments,
+  cmSetClientData,
+  cmSetError,
+  cmAddCacheDefinition,
+  cmAddCustomCommand,
+  cmAddDefineFlag,
+  cmAddDefinition,
+  cmAddExecutable,
+  cmAddLibrary,
+  cmAddLinkDirectoryForTarget,
+  cmAddLinkLibraryForTarget,
+  cmAddUtilityCommand,
+  cmCommandExists,
+  cmExecuteCommand,
+  cmExpandSourceListArguments,
+  cmExpandVariablesInString,
+  cmGetCacheMajorVersion,
+  cmGetCacheMinorVersion,
+  cmGetCurrentDirectory,
+  cmGetCurrentOutputDirectory,
+  cmGetDefinition,
+  cmGetHomeDirectory,
+  cmGetHomeOutputDirectory,
+  cmGetMajorVersion,
+  cmGetMinorVersion,
+  cmGetProjectName,
+  cmGetStartDirectory,
+  cmGetStartOutputDirectory,
+  cmIsOn,
   
-    cmAddSource,
-    cmCreateSourceFile,
-    cmGetSource,
-    cmSourceFileAddDepend,
-    cmSourceFileGetProperty,
-    cmSourceFileGetPropertyAsBool,
-    cmSourceFileGetSourceName,
-    cmSourceFileSetName,
-    cmSourceFileSetName2,
-    cmSourceFileSetProperty,
-    
-    cmCapitalized,
-    cmCopyFileIfDifferent,
-    cmGetFilenameWithoutExtension,
-    cmRemoveFile,
+  cmAddSource,
+  cmCreateSourceFile,
+  cmGetSource,
+  cmSourceFileAddDepend,
+  cmSourceFileGetProperty,
+  cmSourceFileGetPropertyAsBool,
+  cmSourceFileGetSourceName,
+  cmSourceFileSetName,
+  cmSourceFileSetName2,
+  cmSourceFileSetProperty,
+  
+  cmCapitalized,
+  cmCopyFileIfDifferent,
+  cmGetFilenameWithoutExtension,
+  cmRemoveFile,
 };
 

Source/cmCPluginAPI.h

@@ -52,7 +52,9 @@ typedef struct
      information is passed from the InitialPass to FInalPass for commands
      that need a FinalPass and need information from the InitialPass */
   void  (*SetClientData) (void *info, void *cd);
-
+  /* when an error occurs, call this function to set the error string */
+  void  (*SetError) (void *info, const char *err);
+  
   /*=========================================================================
   The following functions all directly map to methods in the cmMakefile
   class. See cmMakefile.h for descriptions of what each method does. All of
@@ -188,6 +190,7 @@ Finally we define the key data structures and function prototypes
     CM_DOC_FUNCTION GetTerseDocumentation;
     CM_DOC_FUNCTION GetFullDocumentation;  
     const char *Name;
+    char *Error;
     void *ClientData;
   } cmLoadedCommandInfo;
 

Source/cmLoadCommandCommand.cxx

@@ -110,6 +110,12 @@ bool cmLoadedCommand::InitialPass(std::vector<std::string> const& args)
     {
     return true;
     }
+
+  // clear the error string
+  if (this->info.Error)
+    {
+    free(this->info.Error);
+    }
   
   // create argc and argv and then invoke the command
   int argc = static_cast<int> (args.size());
@@ -125,10 +131,17 @@ bool cmLoadedCommand::InitialPass(std::vector<std::string> const& args)
     }
   int result = info.InitialPass((void *)&info,(void *)this->m_Makefile,argc,argv);
   cmFreeArguments(argc,argv);
+  
   if (result)
     {
     return true;
     }
+
+  /* Initial Pass must have failed so set the error string */
+  if (this->info.Error)
+    {
+    this->SetError(this->info.Error);
+    }
   return false;
 }
 
@@ -146,6 +159,10 @@ cmLoadedCommand::~cmLoadedCommand()
     {
     this->info.Destructor((void *)&this->info);
     }
+  if (this->info.Error)
+    {
+    free(this->info.Error);
+    }
 }
 
 // cmLoadCommandCommand
@@ -187,16 +204,18 @@ bool cmLoadCommandCommand::InitialPass(std::vector<std::string> const& argsIn)
   cmLibHandle lib = cmDynamicLoader::OpenLibrary(fullPath.c_str());
   if(lib)
     {
-    // Look for the symbol cmLoad, cmGetFactoryCompilerUsed,
-    // and cmGetFactoryVersion in the library
+    // find the init function
+    std::string initFuncName = args[0] + "Init";
     CM_INIT_FUNCTION initFunction
       = (CM_INIT_FUNCTION)
-      cmDynamicLoader::GetSymbolAddress(lib, "cmInitializeCommand");
+      cmDynamicLoader::GetSymbolAddress(lib, initFuncName.c_str());
     if ( !initFunction )
       {
-      initFunction = 
-	(CM_INIT_FUNCTION)(
-	  cmDynamicLoader::GetSymbolAddress(lib, "_cmInitializeCommand"));
+      initFuncName = "_";
+      initFuncName += args[0];
+      initFuncName += "Init";
+      initFunction = (CM_INIT_FUNCTION)(
+        cmDynamicLoader::GetSymbolAddress(lib, initFuncName.c_str()));
       }
     // if the symbol is found call it to set the name on the 
     // function blocker