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diff -up cmake-2.8.11/Source/CMakeLists.txt\~ cmake-2.8.11/Source/CMakeLists.txt
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--- cmake-2.8.11/Source/CMakeLists.txt~	2013-05-15 19:38:13.000000000 +0200
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+++ cmake-2.8.11/Source/CMakeLists.txt	2013-07-25 16:35:01.200389140 +0200
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@@ -308,6 +308,13 @@ if(APPLE)
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     cmLocalXCodeGenerator.h)
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 endif()
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+# GCC shows strict aliasing warnings with cm_sha2.c.  Turn off the
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+# corresponding optimizations.
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+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_GNUCC)
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+  set_source_files_properties(cm_sha2.c PROPERTIES
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+			      COMPILE_FLAGS "-fno-strict-aliasing")
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+endif()
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+
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 if (WIN32)
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   set(SRCS ${SRCS}
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Diff finished.  Thu Jul 25 16:35:18 2013