Compile protobuf before compiling shared C++ libraries.

This change fixes a parallel make which always failed with "cannot find
-lprotobuf".

For C++ static libraries, protobuf was already added as dependency, see
commit 5383062df6.

Makefile

@@ -2825,12 +2825,12 @@ endif
 
 
 ifeq ($(SYSTEM),MINGW32)
-$(LIBDIR)/$(CONFIG)/grpc++.$(SHARED_EXT): $(LIBGRPC++_OBJS)  $(ZLIB_DEP) $(LIBDIR)/$(CONFIG)/gpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/grpc.$(SHARED_EXT) $(OPENSSL_DEP)
+$(LIBDIR)/$(CONFIG)/grpc++.$(SHARED_EXT): $(LIBGRPC++_OBJS)  $(ZLIB_DEP) $(PROTOBUF_DEP) $(LIBDIR)/$(CONFIG)/gpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/grpc.$(SHARED_EXT) $(OPENSSL_DEP)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,--output-def=$(LIBDIR)/$(CONFIG)/grpc++.def -Wl,--out-implib=$(LIBDIR)/$(CONFIG)/libgrpc++-imp.a -o $(LIBDIR)/$(CONFIG)/grpc++.$(SHARED_EXT) $(LIBGRPC++_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr-imp -lgrpc-imp
 else
-$(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT): $(LIBGRPC++_OBJS)  $(ZLIB_DEP) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(OPENSSL_DEP)
+$(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT): $(LIBGRPC++_OBJS)  $(ZLIB_DEP) $(PROTOBUF_DEP) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(OPENSSL_DEP)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)
@@ -3043,12 +3043,12 @@ endif
 
 
 ifeq ($(SYSTEM),MINGW32)
-$(LIBDIR)/$(CONFIG)/grpc++_unsecure.$(SHARED_EXT): $(LIBGRPC++_UNSECURE_OBJS)  $(ZLIB_DEP) $(LIBDIR)/$(CONFIG)/gpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/grpc_unsecure.$(SHARED_EXT)
+$(LIBDIR)/$(CONFIG)/grpc++_unsecure.$(SHARED_EXT): $(LIBGRPC++_UNSECURE_OBJS)  $(ZLIB_DEP) $(PROTOBUF_DEP) $(LIBDIR)/$(CONFIG)/gpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/grpc_unsecure.$(SHARED_EXT)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,--output-def=$(LIBDIR)/$(CONFIG)/grpc++_unsecure.def -Wl,--out-implib=$(LIBDIR)/$(CONFIG)/libgrpc++_unsecure-imp.a -o $(LIBDIR)/$(CONFIG)/grpc++_unsecure.$(SHARED_EXT) $(LIBGRPC++_UNSECURE_OBJS) $(LDLIBS) $(LDLIBSXX) $(LDLIBS_PROTOBUF) -lgpr-imp -lgrpc_unsecure-imp
 else
-$(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT): $(LIBGRPC++_UNSECURE_OBJS)  $(ZLIB_DEP) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT)
+$(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT): $(LIBGRPC++_UNSECURE_OBJS)  $(ZLIB_DEP) $(PROTOBUF_DEP) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT)
 	$(E) "[LD]      Linking $@"
 	$(Q) mkdir -p `dirname $@`
 ifeq ($(SYSTEM),Darwin)

templates/Makefile.template

@@ -1191,6 +1191,9 @@ endif
   lib_deps = ' $(ZLIB_DEP)'
   mingw_libs = ''
   mingw_lib_deps = ' $(ZLIB_DEP)'
+  if lib.language == 'c++':
+    lib_deps += ' $(PROTOBUF_DEP)'
+    mingw_lib_deps += ' $(PROTOBUF_DEP)'
   for dep in lib.get('deps', []):
     libs = libs + ' -l' + dep
     lib_deps = lib_deps + ' $(LIBDIR)/$(CONFIG)/lib' + dep + '.$(SHARED_EXT)'