find_*: Add support for REQUIRED keyword

In the same spirit as the REQUIRED keyword on find_package, this will
stop cmake execution with an error on a failed find_program, find_file,
find_path or find_library.

1 files changed, 2 insertions, 0 deletions

diff --git a/Source/cmFindBase.h b/Source/cmFindBase.h
index c553dbd..4cbf09e 100644
--- a/Source/cmFindBase.h
+++ b/Source/cmFindBase.h
@@ -53,6 +53,8 @@ protected:
   bool AlreadyInCache = false;
   bool AlreadyInCacheWithoutMetaInfo = false;
 
+  bool Required = false;
+
 private:
   // Add pieces of the search.
   void FillPackageRootPath();