From e5d336beb27ea06a0f5058d0ae87c7cd84b8b4b4 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 8 Apr 2015 13:52:02 -0400
Subject: liblzma: Disable GNU 3.3 compiler optimizations

The GNU 3.3 optimizer causes bad behavior in liblzma, so disable it.
---
 Utilities/cmliblzma/CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Utilities/cmliblzma/CMakeLists.txt b/Utilities/cmliblzma/CMakeLists.txt
index 991c699..8920536 100644
--- a/Utilities/cmliblzma/CMakeLists.txt
+++ b/Utilities/cmliblzma/CMakeLists.txt
@@ -215,6 +215,10 @@ 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")
+ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "GNU" AND
+       CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
+  # Disable the old GNU compiler optimizer.
+  SET_PROPERTY(TARGET cmliblzma PROPERTY COMPILE_FLAGS "-O0")
 ENDIF()
 
 INSTALL(FILES COPYING DESTINATION ${CMAKE_DOC_DIR}/cmliblzma)
-- 
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