fix clang++ compile warnings

Makefile.am

@@ -0,0 +1,20 @@
+
+RTM_CPPFLAGS = @RTM_CPPFLAGS@
+AM_CPPFLAGS=$(RTM_CPPFLAGS)
+
+lib_LIBRARIES = librtm.a
+librtm_a_SOURCES = \
+   core/src/rtm.c \
+   core/src/rtm_posix.c \
+   core/src/rtm_json.c \
+   easy/rtm_easy.c
+
+if ENABLE_APPLE_SSL
+librtm_a_SOURCES += \
+   core/src/rtm_apple_ssl.c
+endif
+
+if ENABLE_OPEN_SSL
+librtm_a_SOURCES += \
+   core/src/rtm_openssl.c
+endif

configure.ac

@@ -0,0 +1,30 @@
+
+AC_INIT([librtm], [1.0], [[email protected]])
+AM_INIT_AUTOMAKE([-Wall foreign subdir-objects])
+
+AC_PROG_CC
+AC_PROG_RANLIB
+AM_PROG_AR
+
+AC_ARG_ENABLE(apple-ssl,
+  [  --enable-apple-ssl  Use Apple SSL],
+  [ enable_apple_ssl=yes])
+AM_CONDITIONAL([ENABLE_APPLE_SSL], [test $enable_apple_ssl = yes])
+
+AC_ARG_ENABLE(open-ssl,
+  [  --enable-open-ssl  Use OpenSSL],
+  [ enable_open_ssl=yes])
+AM_CONDITIONAL([ENABLE_OPEN_SSL], [test $enable_open_ssl = yes])
+
+dnl C flags
+RTM_CPPFLAGS="-Ivendor -Icore/src -Ieasy"
+test $enable_apple_ssl = yes && {
+	RTM_CPPFLAGS="${RTM_CPPFLAGS} -DUSE_APPLE_SSL=ON"
+}
+test $enable_open_ssl = yes && {
+	RTM_CPPFLAGS="${RTM_CPPFLAGS} -DUSE_OPENSSL=ON"
+}
+AC_SUBST(RTM_CPPFLAGS)
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT

core/src/rtm.c

@@ -528,15 +528,18 @@ static rtm_status parse_endpoint(rtm_client_t *rtm, const char *endpoint, char *
   ASSERT_NOT_NULL(path_out);
   ASSERT_NOT_NULL(use_tls_out);
 
+  const char port80[] = "80";
+  const char port443[] = "443";
+
   char *auto_port = NULL;
   const char *hostname_start = NULL;
 
   if (strncmp(endpoint, WS_PREFIX, sizeof(WS_PREFIX) - 1) == 0) {
-    auto_port = "80";
+    auto_port = port80;
     hostname_start = endpoint + sizeof(WS_PREFIX) - 1;
     *use_tls_out = NO;
   } else if (strncmp(endpoint, WSS_PREFIX, sizeof(WSS_PREFIX) - 1) == 0) {
-    auto_port = "443";
+    auto_port = port443;
     hostname_start = endpoint + sizeof(WSS_PREFIX) - 1;
     *use_tls_out = YES;
   } else {