Fix port compilation for rebar projects

core/deps.mk

@@ -178,6 +178,7 @@ define dep_autopatch_rebar.erl
 	Write("IGNORE_DEPS += edown eper eunit_formatters meck node_package "
 		"rebar_lock_deps_plugin rebar_vsn_plugin reltool_util\n"),
 	Write("C_SRC_DIR = /path/do/not/exist\n"),
+	Write("C_SRC_TYPE = rebar\n"),
 	Write("DRV_CFLAGS = -fPIC\nexport DRV_CFLAGS\n"),
 	Write(["ERLANG_ARCH = ", rebar_utils:wordsize(), "\nexport ERLANG_ARCH\n"]),
 	fun() ->

plugins/c_src.mk

@@ -32,10 +32,6 @@ CXXFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR)
 
 LDLIBS += -L $(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei
 
-ifeq ($(C_SRC_TYPE),shared)
-LDFLAGS += -shared
-endif
-
 # Verbosity.
 
 c_verbose_0 = @echo " C     " $(?F);
@@ -77,7 +73,9 @@ test-build:: $(C_SRC_ENV) $(C_SRC_OUTPUT)
 
 $(C_SRC_OUTPUT): $(OBJECTS)
 	$(verbose) mkdir -p priv/
-	$(link_verbose) $(CC) $(OBJECTS) $(LDFLAGS) $(LDLIBS) -o $(C_SRC_OUTPUT)
+	$(link_verbose) $(CC) $(OBJECTS) \
+		$(LDFLAGS) $(if $(filter $(C_SRC_TYPE),shared),-shared) $(LDLIBS) \
+		-o $(C_SRC_OUTPUT)
 
 %.o: %.c
 	$(COMPILE_C) $(OUTPUT_OPTION) $<