From 79622d4a3eece8e95c31525e1485274d4adaefe1 Mon Sep 17 00:00:00 2001
From: Nicole Rabjohn <Nicole.Rabjohn@ibm.com>
Date: Wed, 22 Mar 2023 11:59:06 -0400
Subject: IBMClang: No thin LTO on AIX

AIX does not yet support thin LTO.
---
 Modules/Compiler/IBMClang.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Modules/Compiler/IBMClang.cmake b/Modules/Compiler/IBMClang.cmake
index a9d760f..169a0f0 100644
--- a/Modules/Compiler/IBMClang.cmake
+++ b/Modules/Compiler/IBMClang.cmake
@@ -43,7 +43,10 @@ macro(__compiler_ibmclang lang)
   set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
   set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
 
-  set(_CMAKE_LTO_THIN TRUE)
+  # Thin LTO is not yet supported on AIX.
+  if(NOT (CMAKE_SYSTEM_NAME STREQUAL "AIX"))
+    set(_CMAKE_LTO_THIN TRUE)
+  endif()
 
   if(_CMAKE_LTO_THIN)
     set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto=thin")
-- 
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