m4/nut_check_libmodbus.m4: tests on Windows may require -lws2_32 and/…

…or -liphlpapi Signed-off-by: Jim Klimov <[email protected]>
networkupstools · Jan 22, 2025 · ee2d330 · ee2d330
1 parent 9045f4e
commit ee2d330
Showing 1 changed file with 13 additions and 1 deletion.
diff --git a/m4/nut_check_libmodbus.m4 b/m4/nut_check_libmodbus.m4
@@ -73,9 +73,21 @@ if test -z "${nut_have_libmodbus_seen}"; then
 	CFLAGS="${CFLAGS_ORIG} ${depCFLAGS}"
 	LIBS="${LIBS_ORIG} ${depLIBS}"
 	AC_CHECK_HEADERS(modbus.h, [nut_have_libmodbus=yes], [nut_have_libmodbus=no], [AC_INCLUDES_DEFAULT])
+	AS_IF([test x"${nut_have_libmodbus}" = xyes ], [
+		AC_CHECK_FUNCS(modbus_new_tcp, [], [
+			AC_REQUIRE([NUT_CHECK_SOCKETLIB])
+			AS_IF([test x"${NETLIBS-}${NETLIBS_GETADDRS-}" = x], [
+				nut_have_libmodbus=no
+			],[
+				AC_MSG_NOTICE([Retry detection of libmodbus TCP support with NETLIBS])
+				unset ac_cv_func_modbus_new_tcp
+				LIBS="${LIBS} ${NETLIBS} ${NETLIBS_GETADDRS-}"
+				AC_CHECK_FUNCS(modbus_new_tcp, [], [nut_have_libmodbus=no])
+			])
+		])
+	])
 	AS_IF([test x"${nut_have_libmodbus}" = xyes ], [
 		AC_CHECK_FUNCS(modbus_new_rtu, [], [nut_have_libmodbus=no])
-		AC_CHECK_FUNCS(modbus_new_tcp, [], [nut_have_libmodbus=no])
 		AC_CHECK_FUNCS(modbus_set_byte_timeout, [], [nut_have_libmodbus=no])
 		AC_CHECK_FUNCS(modbus_set_response_timeout, [], [nut_have_libmodbus=no])
 	])