cmake: Add --fresh option to clear the cache and start from scratch

Simplify the workflow to re-run CMake from scratch as if a build tree
were never before processed, regardless of whether it has been.

Fixes: #23119

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/cmake.h b/Source/cmake.h
index 3c2a36c610..c2bbff7b41 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -703,6 +703,7 @@ private:
   FileExtensions HipFileExtensions;
   bool ClearBuildSystem = false;
   bool DebugTryCompile = false;
+  bool FreshCache = false;
   bool RegenerateDuringBuild = false;
   std::unique_ptr<cmFileTimeCache> FileTimeCache;
   std::string GraphVizFile;