liblzma: Disable warnings to avoid changing 3rd party code

Utilities/cmliblzma/CMakeLists.txt

@@ -190,6 +190,16 @@ INCLUDE_DIRECTORIES(
   "${CMLIBLZMA_BINARY_DIR}"
   )
 
+# Disable warnings to avoid changing 3rd party code.
+IF("${CMAKE_C_COMPILER_ID}" MATCHES
+    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|MIPSpro|HP|Intel)$")
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
+ELSEIF("${CMAKE_C_COMPILER_ID}" MATCHES "^(PathScale)$")
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
+ELSEIF(BORLAND)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w-")
+ENDIF()
+
 ADD_LIBRARY(cmliblzma ${LZMA_SRCS})
 
 INSTALL(FILES COPYING DESTINATION ${CMAKE_DOC_DIR}/cmliblzma)

Utilities/cmliblzma/common/sysdefs.h

@@ -17,7 +17,9 @@
 #define LZMA_SYSDEFS_H
 
 #if defined(_MSC_VER)
-#  pragma warning(disable: 4028 4244 4761)
+# pragma warning(push,1)
+# pragma warning(disable: 4142) /* benign redefinition of type */
+# pragma warning(disable: 4761) /* integral size mismatch in argument */
 #endif
 
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