From ddaaee907dc617f6a763de37c368e50cd23a8a53 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 29 Jan 2021 18:00:19 +0000
Subject: CMakeDetermineCompilerId: Recognize XCOFF executable format

---
 Modules/CMakeDetermineCompilerId.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 90697f0..1be570e 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -920,6 +920,11 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
       set(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE INTERNAL "Executable file format")
     endif()
 
+    # XCOFF files start with 0x01 followed by 0xDF (32-bit) or 0xF7 (64-bit).
+    if("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "^01(df|f7)")
+      set(CMAKE_EXECUTABLE_FORMAT "XCOFF" CACHE INTERNAL "Executable file format")
+    endif()
+
   endif()
   if(NOT DEFINED CMAKE_EXECUTABLE_FORMAT)
     set(CMAKE_EXECUTABLE_FORMAT)
-- 
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