chore/docs: enable cgo as much as possible

.github/workflows/kernel-test.yml

@@ -25,10 +25,12 @@ jobs:
           go.sum
         go-version: 1.22.4
 
+    - uses: goto-bus-stop/setup-zig@v2
+
     - name: Generate and build
       run: |
         git submodule update --init
-        make GOFLAGS="-buildvcs=false" CC=clang
+        make GOFLAGS="-buildvcs=false"
 
     - name: Store executable
       uses: actions/upload-artifact@v4

.github/workflows/prerelease.yml

@@ -78,6 +78,8 @@ jobs:
             go.sum          
           go-version: '^1.22'
 
+      - uses: goto-bus-stop/setup-zig@v2
+
       - name: Install Dependencies
         run: |
           sudo apt-get update -y

.github/workflows/release.yml

@@ -78,6 +78,8 @@ jobs:
             go.sum          
           go-version: '^1.22'
 
+      - uses: goto-bus-stop/setup-zig@v2
+
       - name: Install Dependencies
         run: |
           sudo apt-get update -y

.github/workflows/seed-build.yml

@@ -104,6 +104,8 @@ jobs:
             go.sum          
           go-version: '^1.22'
 
+      - uses: goto-bus-stop/setup-zig@v2
+
       - name: Install Dependencies
         run: |
           sudo apt-get update -y

Dockerfile

@@ -1,12 +1,12 @@
 FROM golang:1.22-bookworm AS builder
-RUN apt-get update && apt-get install -y llvm-15 clang-15 git make
+RUN apt-get update && apt-get install -y llvm-15 clang-15 git make musl-tools
 ENV CLANG=clang-15
 WORKDIR /build/
 ADD go.mod go.sum ./
 RUN go mod download
 ADD . .
 RUN git submodule update --init
-RUN make OUTPUT=dae GOFLAGS="-buildvcs=false" CC=clang CGO_ENABLED=0
+RUN make OUTPUT=dae GOFLAGS="-buildvcs=false"
 
 FROM alpine
 RUN mkdir -p /usr/local/share/dae/
@@ -17,5 +17,4 @@ COPY --from=builder /build/dae /usr/local/bin
 COPY --from=builder /build/install/empty.dae /etc/dae/config.dae
 RUN chmod 0600 /etc/dae/config.dae
 
-CMD ["dae"]
-ENTRYPOINT ["dae", "run", "-c", "/etc/dae/config.dae"]
+CMD ["dae", "run", "-c", "/etc/dae/config.dae"]

Makefile

@@ -16,6 +16,7 @@ CFLAGS := -DMAX_MATCH_SET_LEN=$(MAX_MATCH_SET_LEN) $(CFLAGS)
 NOSTRIP ?= n
 STRIP_PATH := $(shell command -v $(STRIP) 2>/dev/null)
 BUILD_TAGS_FILE := .build_tags
+KEEP_CGO_ENVS ?= 0
 ifeq ($(strip $(NOSTRIP)),y)
 	STRIP_FLAG := -no-strip
 else ifeq ($(wildcard $(STRIP_PATH)),)
@@ -24,7 +25,18 @@ else
 	STRIP_FLAG := -strip=$(STRIP_PATH)
 endif
 
-GOARCH ?= $(shell go env GOARCH)
+ifndef CGO_ENABLED
+CGO_ENABLED_NDEF := 1
+CGO_ENABLED := $(shell go env CGO_ENABLED)
+endif
+ifndef CC
+CC_NDEF := 1
+CC := $(shell go env CC)
+endif
+ifndef GOARCH
+GOARCH_NDEF := 1
+GOARCH := $(shell go env GOARCH)
+endif
 
 # Do NOT remove the line below. This line is for CI.
 #export GOMODCACHE=$(PWD)/go-mod
@@ -39,18 +51,23 @@ else
 	VERSION ?= unstable-$(date).r$(count).$(commit)
 endif
 
-BUILD_ARGS := -trimpath -ldflags "-s -w -X github.com/daeuniverse/dae/cmd.Version=$(VERSION) -X github.com/daeuniverse/dae/common/consts.MaxMatchSetLen_=$(MAX_MATCH_SET_LEN)" $(BUILD_ARGS)
+
+GO_BUILD_ARGS = -trimpath -ldflags "-s -w -X github.com/daeuniverse/dae/cmd.Version=$(VERSION) -X github.com/daeuniverse/dae/common/consts.MaxMatchSetLen_=$(MAX_MATCH_SET_LEN) $(GO_LDFLAGS)" $(BUILD_ARGS)
 
 .PHONY: clean-ebpf ebpf dae submodule submodules
 
 ## Begin Dae Build
 dae: export GOOS=linux
-ifndef CGO_ENABLED
-dae: export CGO_ENABLED=0
-endif
 dae: ebpf
-	@echo $(CFLAGS)
-	go build -tags=$(shell cat $(BUILD_TAGS_FILE)) -o $(OUTPUT) $(BUILD_ARGS) .
+	$(eval include cgo_enabled.mk)
+	$(info CFLAGS=$(CFLAGS))
+	$(info KEEP_CGO_ENVS=$(KEEP_CGO_ENVS))
+	$(info CGO_ENABLED=$(CGO_ENABLED))
+	$(info GO_LDFLAGS=$(GO_LDFLAGS))
+	$(info CC=$(CC))
+	$(info GOARCH=$(GOARCH))
+	go build -tags=$(shell cat $(BUILD_TAGS_FILE)) -o $(OUTPUT) $(GO_BUILD_ARGS) .
+	@$(STRIP) $(OUTPUT) || strip $(OUTPUT) || true
 ## End Dae Build
 
 ## Begin Git Submodules

cgo_enabled.mk

@@ -0,0 +1,32 @@
+#
+#  SPDX-License-Identifier: AGPL-3.0-only
+#  Copyright (c) 2022-2024, daeuniverse Organization <[email protected]>
+#
+
+ifneq ($(KEEP_CGO_ENVS),1)
+    ifdef CGO_ENABLED_NDEF
+        export CGO_ENABLED := 0
+    endif
+    ifeq ($(CGO_ENABLED),0)
+        ifdef GOARCH_NDEF
+            ifeq ($(CC),cc)
+                ifneq ($(shell which musl-gcc),)
+                    export CC := musl-gcc
+                else ifneq ($(shell which zig),)
+                    export CC := zig cc -target $(shell . install/musl-targets.sh && echo $$GOARCH_$(GOARCH))
+                else
+                    $(info ! CGO_ENABLED=0 is not recommended. Please consider to install musl-gcc for static link instead. See https://github.com/daeuniverse/dae/issues/557)
+                endif
+            endif
+        else ifneq ($(shell which zig),)
+            export CC := zig cc -target $(shell . install/musl-targets.sh && echo $$GOARCH_$(GOARCH))
+        else
+            $(info ! CGO_ENABLED=0 is not recommended. See https://github.com/daeuniverse/dae/issues/557)
+        endif
+    endif
+    ifneq ($(CC),cc)
+        export CGO_ENABLED := 1
+        GO_LDFLAGS += -linkmode external -extldflags=-static
+        $(info * Building dae with "$(CC)" static linking instead of CGO_ENABLED=0. See https://github.com/daeuniverse/dae/issues/557)
+    endif
+endif

docs/en/user-guide/build-by-yourself.md

@@ -18,8 +18,7 @@ git clone https://github.com/daeuniverse/dae.git
 cd dae
 git submodule update --init
 ## Minimal dependency build
-make GOFLAGS="-buildvcs=false" \
-  CC=clang
+make GOFLAGS="-buildvcs=false" CC=clang KEEP_CGO_ENVS=1
 
 ## Normal build
 #make

install/musl-targets.sh

@@ -0,0 +1,9 @@
+GOARCH_386=i386-linux-musl
+GOARCH_amd64=x86_64-linux-musl
+GOARCH_arm=arm-linux-musleabi
+GOARCH_arm64=aarch64-linux-musl
+GOARCH_mips64le=mips64el-linux-musl
+GOARCH_mips64=mips64-linux-musl
+GOARCH_mipsle=mipsel-linux-musl
+GOARCH_mips=mips-linux-musl
+GOARCH_riscv64=riscv64-linux-musl