build: enable Go modules on amd64 only

the current Go doesn’t support c-shared on other architectures than amd64

Makefile

@@ -28,10 +28,14 @@ $(eval $(call find_lib,socket_wrapper))
 $(eval $(call find_lib,libdnssec))
 $(eval $(call find_gopkg,geoip,github.com/abh/geoip))
 # Find Go compiler version
+# @note Go 1.5 support amd64 only, disabled for other architectures
+ifeq ($(ARCH),x86_64)
 E :=
 GO_VERSION := $(subst $(E) $(E),,$(subst go,,$(wordlist 1,2,$(subst ., ,$(word 3,$(shell $(GO) version))))))
 $(eval $(call find_ver,go,$(GO_VERSION),15))
-
+else
+HAS_go = no
+endif
 # Work around luajit on OS X
 ifeq ($(PLATFORM), Darwin)
 ifneq (,$(findstring luajit, $(lua_LIBS)))
@@ -41,8 +45,36 @@ endif
 
 BUILD_CFLAGS += $(libknot_CFLAGS) $(libuv_CFLAGS) $(cmocka_CFLAGS) $(python_CFLAGS) $(lua_CFLAGS) $(libdnssec_CFLAGS)
 
+# Overview
+info:
+	$(info Target:     Knot DNS Resolver $(MAJOR).$(MINOR).$(PATCH)-$(PLATFORM))
+	$(info Compiler:   $(CC) $(BUILD_CFLAGS))
+	$(info Linker:     $(LD) $(BUILD_LDFLAGS))
+	$(info PREFIX:     $(PREFIX))
+	$(info BINDIR:     $(BINDIR))
+	$(info LIBDIR:     $(LIBDIR))
+	$(info INCLUDEDIR: $(INCLUDEDIR))
+	$(info MODULEDIR:  $(MODULEDIR))
+	$(info )
+	$(info Dependencies)
+	$(info ------------)
+	$(info [$(HAS_libknot)] libknot (lib))
+	$(info [$(HAS_lua)] LuaJIT (daemon))
+	$(info [$(HAS_libuv)] libuv (daemon))
+	$(info )
+	$(info Optional)
+	$(info --------)
+	$(info [$(HAS_doxygen)] doxygen (doc))
+	$(info [$(HAS_go)] Go 1.5+ on amd64 (modules/go))
+	$(info [$(HAS_geoip)] github.com/abh/geoip (modules/tinyweb))
+	$(info [$(HAS_libmemcached)] libmemcached (modules/memcached))
+	$(info [$(HAS_hiredis)] hiredis (modules/redis))
+	$(info [$(HAS_cmocka)] cmocka (tests/unit))
+	$(info [$(HAS_python)] Python (tests/integration))
+	$(info [$(HAS_socket_wrapper)] socket_wrapper (lib))
+	$(info )
+
 # Sub-targets
-include help.mk
 include lib/lib.mk
 include daemon/daemon.mk
 include modules/modules.mk

help.mk

-info:
-	$(info )
-	$(info Target:     Knot DNS Resolver $(MAJOR).$(MINOR).$(PATCH)-$(PLATFORM))
-	$(info Compiler:   $(CC) $(BUILD_CFLAGS))
-	$(info Linker:     $(LD) $(BUILD_LDFLAGS))
-	$(info PREFIX:     $(PREFIX))
-	$(info BINDIR:     $(BINDIR))
-	$(info LIBDIR:     $(LIBDIR))
-	$(info INCLUDEDIR: $(INCLUDEDIR))
-	$(info MODULEDIR:  $(MODULEDIR))
-	$(info )
-	$(info Dependencies)
-	$(info ------------)
-	$(info [$(HAS_libknot)] libknot (lib))
-	$(info [$(HAS_lua)] LuaJIT (daemon))
-	$(info [$(HAS_libuv)] libuv (daemon))
-	$(info )
-	$(info Optional)
-	$(info --------)
-	$(info [$(HAS_doxygen)] doxygen (doc))
-	$(info [$(HAS_go)] Go (modules/go))
-	$(info [$(HAS_geoip)] github.com/abh/geoip (modules/tinyweb))
-	$(info [$(HAS_libmemcached)] libmemcached (modules/memcached))
-	$(info [$(HAS_hiredis)] hiredis (modules/redis))
-	$(info [$(HAS_cmocka)] cmocka (tests/unit))
-	$(info [$(HAS_python)] Python (tests/integration))
-	$(info [$(HAS_socket_wrapper)] socket_wrapper (lib))
-	$(info )

platform.mk

@@ -10,6 +10,7 @@ MODTYPE := shared
 ARTYPE  := static
 BINEXT :=
 PLATFORM = Linux
+ARCH :=
 ifeq ($(OS),Windows_NT)
 	PLATFORM := Windows
 	RM := del
@@ -17,6 +18,7 @@ ifeq ($(OS),Windows_NT)
 	LIBEXT := .lib
 	BINEXT := .exe
 else
+	ARCH := $(shell uname -m)
 	UNAME := $(shell uname -s)
     ifeq ($(UNAME),Darwin)
         PLATFORM := Darwin