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Add sse4.1 flag when using clang-cl on MSVC targets

Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -14,6 +14,14 @@

 include(CMakeDependentOption)

 include(FeatureSummary)

+# Detect clang-cl

+set(MSVC_CLANG_CL false BOOL)

+if (MSVC)

+    if("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")

+        set(MSVC_CLANG_CL true BOOL)

+    endif()

+endif()

+

 set(OPUS_BUILD_SHARED_LIBRARY_HELP_STR "build shared library.")

 option(OPUS_BUILD_SHARED_LIBRARY ${OPUS_BUILD_SHARED_LIBRARY_HELP_STR} OFF)

 if(OPUS_BUILD_SHARED_LIBRARY OR BUILD_SHARED_LIBS OR OPUS_BUILD_FRAMEWORK)

@@ -484,13 +492,13 @@

         add_sources_group(opus lpcnet ${dnn_sources_sse4_1})

       endif()

       target_compile_definitions(opus PRIVATE OPUS_X86_MAY_HAVE_SSE4_1)

-      if(NOT MSVC)

+      if(NOT MSVC OR MSVC_CLANG_CL)

         set_source_files_properties(${celt_sources_sse4_1} ${silk_sources_sse4_1} ${dnn_sources_sse4_1} PROPERTIES COMPILE_FLAGS -msse4.1)

       endif()

       if(OPUS_FIXED_POINT)

         add_sources_group(opus silk ${silk_sources_fixed_sse4_1})

-        if(NOT MSVC)

+        if(NOT MSVC OR MSVC_CLANG_CL)

           set_source_files_properties(${silk_sources_fixed_sse4_1} PROPERTIES COMPILE_FLAGS -msse4.1)

         endif()

       endif()

@@ -497,7 +505,7 @@

     endif()

     if(OPUS_X86_PRESUME_SSE4_1)

       target_compile_definitions(opus PRIVATE OPUS_X86_PRESUME_SSE4_1)

-      if(NOT MSVC)

+      if(NOT MSVC OR MSVC_CLANG_CL)

         target_compile_options(opus PRIVATE -msse4.1)

       endif()

     endif()

-- 

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