fix: no longer explicitly specify cgo_enabled (labring#1253)

Signed-off-by: maybaby <[email protected]>

Author: whybeyoung

DEVELOPGUIDE.md

@@ -12,11 +12,24 @@ cd sealos
 make build
 ```
 
-You can scp the bin file to your linux host. 
+You can scp the bin file to your linux host.
 
 If you use multipaas, you can mount the bin dir to the vm:
+
 ```shell script
 multipass mount /your-bin-dir <name>[:<path>]
 ```
 
+## Notice About build and cross build
+
+Since Golang CGO_ENABLED is enabled by default if it is not specified, if you compile the sealos binary of linuxos on
+macos, it is cross-compiled, and since CGO_ENABLED is not explicitly specified, go will close CGO_ENABLED by default,
+that is, CGO_ENABLED=0, and compile at this time Some functions of sealos will not be supported, such as
+'images' subcommand depends on cgo for overlay. At this time, sealos does not support overlay driver by default, and
+will report "driver not supported" error. Therefore, if you are developing or debugging images storage related
+functions, it is best to compile sealos in a linux environment such as ubuntu.
+
+In addition, the final release build of sealos is based on the ubuntu environment of Github Action. The built binary
+defaults to open CGO and supports overlay driver.
+
 Then test it locally.

scripts/make-rules/golang.mk

@@ -48,22 +48,22 @@ go.build.%.sealos:
 	$(eval PLATFORM := $(word 1,$(subst ., ,$*)))
 	$(eval OS := $(word 1,$(subst _, ,$(PLATFORM))))
 	$(eval ARCH := $(word 2,$(subst _, ,$(PLATFORM))))
-	$(eval GO_LDFLAGS += -linkmode external)
+	$(eval GO_LDFLAGS += "")
 
 	@echo "===========> Building binary $(COMMAND) for $(PLATFORM)"
 	@mkdir -p $(BIN_DIR)/$(PLATFORM)
-	CGO_ENABLED=1 GOOS=$(OS) GOARCH=$(ARCH) $(GO) build $(GO_BUILD_FLAGS) -o $(BIN_DIR)/$(PLATFORM)/$(COMMAND) $(ROOT_PACKAGE)/cmd/$(COMMAND)
+	GOOS=$(OS) GOARCH=$(ARCH) $(GO) build $(GO_BUILD_FLAGS) -o $(BIN_DIR)/$(PLATFORM)/$(COMMAND) $(ROOT_PACKAGE)/cmd/$(COMMAND)
 
 .PHONY: go.build.%.sealctl
 go.build.%.sealctl:
 	$(eval COMMAND := sealctl)
 	$(eval PLATFORM := $(word 1,$(subst ., ,$*)))
 	$(eval OS := $(word 1,$(subst _, ,$(PLATFORM))))
 	$(eval ARCH := $(word 2,$(subst _, ,$(PLATFORM))))
-
 	@echo "===========> Building binary $(COMMAND) for $(PLATFORM)"
 	@mkdir -p $(BIN_DIR)/$(PLATFORM)
-	CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH) $(GO) build $(GO_BUILD_FLAGS) -o $(BIN_DIR)/$(PLATFORM)/$(COMMAND) $(ROOT_PACKAGE)/cmd/$(COMMAND)
+	GOOS=$(OS) GOARCH=$(ARCH) $(GO) build $(GO_BUILD_FLAGS) -o $(BIN_DIR)/$(PLATFORM)/$(COMMAND) $(ROOT_PACKAGE)/cmd/$(COMMAND)
+
 
 .PHONY: go.build
 go.build: go.build.verify $(addprefix go.build., $(addprefix $(PLATFORM)., $(BINS)))