Also support -xarch=sse_42 in the Sun C compiler for x86(-64).

Change-Id: Ib6d0ae9c237b96568e2522d2077b311b3ac5af2e
Reviewed-on: https://code.wireshark.org/review/6706
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 12 insertions, 7 deletions

diff --git a/wsutil/CMakeLists.txt b/wsutil/CMakeLists.txt
index 0a8ed63acc..9a559e094f 100644
--- a/wsutil/CMakeLists.txt
+++ b/wsutil/CMakeLists.txt
@@ -77,14 +77,13 @@ set(WSUTIL_FILES
 )
 
 #
-# 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.
+# XXX - we're assuming MSVC doesn't require a flag to enable SSE 4.2
+# support, and that, if the compiler supports a flag for SSE 4.2
+# support, the intrinsics are supported iff we can include the
+# <nmmintrin.h> 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.
+# We only check for the GCC-style -msse4.2 flag and the Sun C
+# -xarch=sse4_2 flag.
 #
 if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
 	set(HAVE_SSE4_2 TRUE)
@@ -94,6 +93,12 @@ else()
 	check_c_compiler_flag(-msse4.2 HAVE_SSE4_2)
 	if(HAVE_SSE4_2)
 		set(SSE4_2_FLAG "-msse4.2")
+	else()
+		message(STATUS "Checking for c-compiler flag: -xarch=sse4_2")
+		check_c_compiler_flag(-xarch=sse4_2 HAVE_SSE4_2)
+		if(HAVE_SSE4_2)
+			set(SSE4_2_FLAG "-xarch=sse4_2")
+		endif()
 	endif()
 endif()
 if(HAVE_SSE4_2)