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, 11 insertions, 3 deletions

diff --git a/Source/cmFindPackageCommand.cxx b/Source/cmFindPackageCommand.cxx
index 694eb0f..6d788e4 100644
--- a/Source/cmFindPackageCommand.cxx
+++ b/Source/cmFindPackageCommand.cxx
@@ -33,6 +33,7 @@
 #include "cmSystemTools.h"
 #include "cmValue.h"
 #include "cmVersion.h"
+#include "cmake.h"
 
 #if defined(__HAIKU__)
 #  include <FindDirectory.h>
@@ -144,9 +145,6 @@ bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args)
     this->RequiredCMakeVersion = CMake_VERSION_ENCODE(v[0], v[1], v[2]);
   }
 
-  this->DebugMode = this->ComputeIfDebugModeWanted();
-  this->DebugBuffer.clear();
-
   // Lookup target architecture, if any.
   if (cmValue arch =
         this->Makefile->GetDefinition("CMAKE_LIBRARY_ARCHITECTURE")) {
@@ -236,6 +234,10 @@ bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args)
   // Always search directly in a generated path.
   this->SearchPathSuffixes.emplace_back();
 
+  // Process debug mode
+  this->DebugMode = this->ComputeIfDebugModeWanted(this->Name);
+  this->DebugBuffer.clear();
+
   // Parse the arguments.
   enum Doing
   {
@@ -619,6 +621,12 @@ bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args)
   return loadedPackage;
 }
 
+bool cmFindPackageCommand::ComputeIfDebugModeWanted(std::string const& var)
+{
+  return this->ComputeIfDebugModeWanted() ||
+    this->Makefile->GetCMakeInstance()->GetDebugFindPkgOutput(var);
+}
+
 bool cmFindPackageCommand::FindPackageUsingModuleMode()
 {
   bool foundModule = false;