Packages: Integrate FetchContent and find_package()

Allow FetchContent_MakeAvailable() to try a call to
find_package() first, or redirect a find_package() call to
FetchContent_MakeAvailable(). The user can set variables
to control which of these are allowed or tried by default.

Fixes: #21687

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/cmFindPackageCommand.h b/Source/cmFindPackageCommand.h
index b9f19e4..d01a886 100644
--- a/Source/cmFindPackageCommand.h
+++ b/Source/cmFindPackageCommand.h
@@ -76,6 +76,7 @@ private:
       : cmFindCommon::PathLabel(label)
     {
     }
+    static PathLabel PackageRedirect;
     static PathLabel UserRegistry;
     static PathLabel Builds;
     static PathLabel SystemRegistry;
@@ -119,8 +120,10 @@ private:
   };
   bool ReadListFile(const std::string& f, PolicyScopeRule psr);
   void StoreVersionFound();
+  void SetConfigDirCacheVariable(const std::string& value);
 
   void ComputePrefixes();
+  void FillPrefixesPackageRedirect();
   void FillPrefixesPackageRoot();
   void FillPrefixesCMakeEnvironment();
   void FillPrefixesCMakeVariable();