fix-msa-support-for-mips.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c1d632..a2a0d0d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -158,8 +158,8 @@ endif()
 # set definitions and sources for MIPS
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
    CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*")
-  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
-  set(PNG_MIPS_MSA "on" CACHE STRING "Enable MIPS_MSA optimizations:
+  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off check)
+  set(PNG_MIPS_MSA "check" CACHE STRING "Enable MIPS_MSA optimizations:
      off: disable the optimizations")
   set_property(CACHE PNG_MIPS_MSA PROPERTY STRINGS
      ${PNG_MIPS_MSA_POSSIBLE_VALUES})
@@ -173,6 +173,8 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
       mips/filter_msa_intrinsics.c)
     if(${PNG_MIPS_MSA} STREQUAL "on")
       add_definitions(-DPNG_MIPS_MSA_OPT=2)
+    else()
+      add_definitions(-DPNG_MIPS_MSA_CHECK_SUPPORTED)
     endif()
   else()
     add_definitions(-DPNG_MIPS_MSA_OPT=0)