Cmake: check for popcount, and build it from wsutil/popcount.c if missing.

Change-Id: Id646a9f0b1fc6acafa99a78725e3f0ec8a48c170
Reviewed-on: https://code.wireshark.org/review/6006
Reviewed-by: Guy Harris <guy@alum.mit.edu>

ConfigureChecks.cmake

@@ -86,6 +86,7 @@ check_function_exists("mmap"             HAVE_MMAP)
 check_function_exists("mprotect"         HAVE_MPROTECT)
 check_function_exists("mkdtemp"          HAVE_MKDTEMP)
 check_function_exists("mkstemp"          HAVE_MKSTEMP)
+check_function_exists("popcount"         HAVE_POPCOUNT)
 check_function_exists("setresgid"        HAVE_SETRESGID)
 check_function_exists("setresuid"        HAVE_SETRESUID)
 check_function_exists("strptime"         HAVE_STRPTIME)

cmakeconfig.h.in

@@ -242,6 +242,9 @@
 /* Define to 1 if you have the `pcap_set_tstamp_precision' function. */
 #cmakedefine HAVE_PCAP_SET_TSTAMP_PRECISION 1
 
+/* Define to 1 if you have the popcount function. */
+#cmakedefine HAVE_POPCOUNT 1
+
 /* Define to 1 if you have the <portaudio.h> header file. */
 #cmakedefine HAVE_PORTAUDIO_H 1
 

wsutil/CMakeLists.txt

@@ -38,6 +38,12 @@ if(HAVE_SSE4_2)
 	)
 endif()
 
+if(NOT HAVE_POPCOUNT)
+	set( WSUTIL_POPCOUNT_FILES
+		popcount.c
+	)
+endif()
+
 set(WSUTIL_FILES
 	adler32.c
 	aes.c
@@ -89,6 +95,7 @@ set(WSUTIL_FILES
 	ws_version_info.c
 	${WSUTIL_PLATFORM_FILES}
 	${WSUTIL_SSE42_FILES}
+	${WSUTIL_POPCOUNT_FILES}
 )
 
 if(APPLE)