cmake: Add filtered debug-find options

Add a `--debug-find-pkg=` option to debug find calls for specific
packages.

Add a `--debug-find-var=` option to debug find calls for specific
return variables.

Fixes: #21880

1 files changed, 8 insertions, 1 deletions

diff --git a/Source/cmake.h b/Source/cmake.h
index 3f2b2eda41..a356e6596c 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -486,7 +486,11 @@ public:
 
   //! Do we want debug output from the find commands during the cmake run.
   bool GetDebugFindOutput() const { return this->DebugFindOutput; }
-  void SetDebugFindOutputOn(bool b) { this->DebugFindOutput = b; }
+  bool GetDebugFindOutput(std::string const& var) const;
+  bool GetDebugFindPkgOutput(std::string const& var) const;
+  void SetDebugFindOutput(bool b) { this->DebugFindOutput = b; }
+  void SetDebugFindOutputPkgs(std::string const& args);
+  void SetDebugFindOutputVars(std::string const& args);
 
   //! Do we want trace output during the cmake run.
   bool GetTrace() const { return this->Trace; }
@@ -704,6 +708,9 @@ private:
 
   std::vector<std::string> TraceOnlyThisSources;
 
+  std::set<std::string> DebugFindPkgs;
+  std::set<std::string> DebugFindVars;
+
   LogLevel MessageLogLevel = LogLevel::LOG_STATUS;
   bool LogLevelWasSetViaCLI = false;
   bool LogContext = false;