From 6e1d3edb4d1e1b491df879a2764d8a24442795dc Mon Sep 17 00:00:00 2001
From: Alex Neundorf <neundorf@kde.org>
Date: Thu, 16 Jun 2011 21:11:06 +0200
Subject: [PATCH] Add a switch to disable a find_package() call completely

As discussed, this adds a switch CMAKE_DISABLE_FIND_PACKAGE_<name>,
which, when set to TRUE, keeps the find_package() command from executing.
When the package is REQUIRED at the same time, an error is generated.

Alex
---
 Source/cmFindPackageCommand.cxx | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Source/cmFindPackageCommand.cxx b/Source/cmFindPackageCommand.cxx
index 5f106bce0..554601dcb 100644
--- a/Source/cmFindPackageCommand.cxx
+++ b/Source/cmFindPackageCommand.cxx
@@ -607,6 +607,24 @@ bool cmFindPackageCommand
       }
     }
 
+  std::string disableFindPackageVar = "CMAKE_DISABLE_FIND_PACKAGE_";
+  disableFindPackageVar += this->Name;
+  if(this->Makefile->IsOn(disableFindPackageVar.c_str()))
+    {
+    if (this->Required)
+      {
+      cmOStringStream e;
+      e << "for module " << this->Name << " called with REQUIRED, but "
+        << disableFindPackageVar
+        << " is enabled. A REQUIRED package cannot be disabled.";
+      this->SetError(e.str().c_str());
+      return false;
+      }
+
+    return true;
+    }
+
+
   this->SetModuleVariables(components);
 
   // See if there is a Find<package>.cmake module.