Don't use -msse4.2 with MSVC.

Change-Id: I457d45d9ad05e0eb851e78a7342e666ef9df8ffd
Reviewed-on: https://code.wireshark.org/review/5086
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 17 insertions, 5 deletions

diff --git a/wsutil/CMakeLists.txt b/wsutil/CMakeLists.txt
index bf9ebfc1d8..a7f0663ead 100644
--- a/wsutil/CMakeLists.txt
+++ b/wsutil/CMakeLists.txt
@@ -122,11 +122,23 @@ if (WERROR)
 	)
 endif()
 if (HAVE_SSE4_2)
-	set_source_files_properties(
-		${WSUTIL_SSE42_FILES}
-		PROPERTIES
-		COMPILE_FLAGS -msse4.2
-	)
+	#
+	# XXX - we're assuming MSVC supports the SSE 4.2 intrinsics and
+	# that other C compilers support them iff they support the
+	# -msse4.2 flag.
+	#
+	# Perhaps we should check whether we can compile something
+	# that uses them, instead, and do something else to figure
+	# out what compiler flag, if any, we need to pass to the
+	# compiler to compile code that uses them.
+	#
+	if(NOT CMAKE_C_COMPILER_ID MATCHES "MSVC")
+		set_source_files_properties(
+			${WSUTIL_SSE42_FILES}
+			PROPERTIES
+			COMPILE_FLAGS -msse4.2
+		)
+	endif()
 endif()
 
 add_library(wsutil ${LINK_MODE_LIB}