From d8126d3784c149f1738865cc239a34fdd29ec442 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 2 Apr 2015 13:16:23 -0400
Subject: liblzma: Disable XL compiler optimizations

Somehow the XL compiler optimizations create incorrect behavior in
liblzma and lead to crashes or truncated output during compression.
---
 Utilities/cmliblzma/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Utilities/cmliblzma/CMakeLists.txt b/Utilities/cmliblzma/CMakeLists.txt
index d991438..991c699 100644
--- a/Utilities/cmliblzma/CMakeLists.txt
+++ b/Utilities/cmliblzma/CMakeLists.txt
@@ -211,4 +211,10 @@ ENDIF()
 
 ADD_LIBRARY(cmliblzma ${LZMA_SRCS})
 
+IF(CMAKE_C_COMPILER_ID STREQUAL "XL")
+  # Disable the XL compiler optimizer because it causes crashes
+  # and other bad behavior in liblzma code.
+  SET_PROPERTY(TARGET cmliblzma PROPERTY COMPILE_FLAGS "-qnooptimize")
+ENDIF()
+
 INSTALL(FILES COPYING DESTINATION ${CMAKE_DOC_DIR}/cmliblzma)
-- 
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