From cc8162a98144749e5dd73fdc0fe290afe35b65bb Mon Sep 17 00:00:00 2001
From: Craig Scott <craig.scott@crascit.com>
Date: Thu, 17 Dec 2020 21:09:46 +1100
Subject: CMakeDetermineCompilerId: Ensure CMAKE_EXECUTABLE_FORMAT is INTERNAL

Fixes: #21607
---
 Modules/CMakeDetermineCompilerId.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 8cf161f..d07db70 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -911,12 +911,12 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
 
 #    # COFF (.exe) files start with "MZ"
 #    if("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
-#      set(CMAKE_EXECUTABLE_FORMAT "COFF" CACHE STRING "Executable file format")
+#      set(CMAKE_EXECUTABLE_FORMAT "COFF" CACHE INTERNAL "Executable file format")
 #    endif()
 #
     # Mach-O files start with MH_MAGIC or MH_CIGAM
     if("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface|cefaedfe|feedfacf|cffaedfe")
-      set(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
+      set(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE INTERNAL "Executable file format")
     endif()
 
   endif()
-- 
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