ENH: Preserve <pkg>_FIND_XXX vars in find_package

When the find_package command loads a module it sets several
<pkg>_FIND_XXX variables to communicate information about the command
invocation to the module.  This restores the original state of the
variables when the command returns.  This behavior is useful when a
find-module recursively calls find_package with NO_MODULE so that the
inner call does not change the values in the find-module.

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmFindPackageCommand.h b/Source/cmFindPackageCommand.h
index cf7b93c..1bfb2af 100644
--- a/Source/cmFindPackageCommand.h
+++ b/Source/cmFindPackageCommand.h
@@ -75,6 +75,8 @@ private:
   void AppendToProperty(const char* propertyName);
   void SetModuleVariables(const std::string& components);
   bool FindModule(bool& found);
+  void AddFindDefinition(const char* var, const char* val);
+  void RestoreFindDefinitions();
   bool HandlePackageMode();
   void FindConfig();
   bool FindPrefixedConfig();
@@ -104,6 +106,9 @@ private:
 
   friend class cmFindPackageFileList;
 
+  struct OriginalDef { bool exists; std::string value; };
+  std::map<cmStdString, OriginalDef> OriginalDefs;
+
   std::string CommandDocumentation;
   cmStdString Name;
   cmStdString Variable;