stdout Hello

# Some targets don't support -static
[GOOS:darwin] skip 'no static linking on Darwin'
[GOOS:solaris] skip 'no static linking on Solaris'

# Building with -linkmode=external -extldflags=-static should work.
go build -ldflags='-linkmode=external -extldflags=-static'
! stderr runtime/cgo
exec ./hello
stdout Hello

-- go.mod --
module hello

go 1.20
-- hello.go --
package main

import "fmt"

func main() {

		}
		id, err = buildid.ReadFile(tg.path("hello3.exe"))
		if err != nil {
			t.Fatalf("reading build ID from hello binary (linkmode=external -extldflags=-fuse-ld=gold): %v", err)
		}
		if id != buildID {
			t.Fatalf("buildID in hello binary = %q, want %q (linkmode=external -extldflags=-fuse-ld=gold)", id, buildID)
		}
	}

[cgo] env CGO_CXXFLAGS=-DFROM_CXXFLAGS=1
[cgo] env CGO_LDFLAGS=-L/extra/dir/does/not/exist
[cgo] go build '-ldflags=all=-linkmode=external -extldflags=-L/bonus/dir/does/not/exist'
[cgo] go version -m m$GOEXE
[cgo] stdout '^\tbuild\t-ldflags="all=-linkmode=external -extldflags=-L/bonus/dir/does/not/exist"$'
[cgo] stdout '^\tbuild\tCGO_ENABLED=1$'
[cgo] stdout '^\tbuild\tCGO_CPPFLAGS=-DFROM_CPPFLAGS=1$'

	cd $(MD_PATH) && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o $(BIN_NAME)-amd64 -a -tags netgo -ldflags '-w -extldflags "-static"' main.go

$(MD_PATH)/$(BIN_NAME)-arm64: $(MD_PATH)/main.go
	cd $(MD_PATH) && CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o $(BIN_NAME)-arm64 -a -tags netgo -ldflags '-w -extldflags "-static"' main.go

build: $(MD_PATH)/$(BIN_NAME)-amd64  $(MD_PATH)/$(BIN_NAME)-arm64

build_and_push: build

all: build_and_push clean

build_and_push:
	cd $(MD_PATH) && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o main-amd64 -a -tags netgo -ldflags '-w -extldflags "-static"' main.go
	cd $(MD_PATH) && CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o main-arm64 -a -tags netgo -ldflags '-w -extldflags "-static"' main.go
	docker buildx build --platform=linux/amd64,linux/arm64  $(MD_PATH) -t $(IMG):$(TAG) --push

clean:

[short] skip
[!cgo] skip
[GOOS:aix] skip  # no --gc-sections
[GOOS:darwin] skip  # no --gc-sections

go build -ldflags='-linkmode=external -extldflags=-Wl,--gc-sections'
go version hello$GOEXE
! stdout 'not a Go executable'
! stderr 'not a Go executable'

-- go.mod --
module hello
-- hello.go --
package main

/*
*/
import "C"

# build a tcp-echo binary using the golang container
FROM golang:1.22 as builder
WORKDIR /go/src/istio.io/tcp-echo-server/
COPY main.go .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags '-extldflags -static -s -w' -o tcp-echo main.go

FROM scratch

WORKDIR /bin/
COPY --from=builder /go/src/istio.io/tcp-echo-server/tcp-echo .
ENTRYPOINT [ "/bin/tcp-echo" ]
CMD [ "9000", "hello" ]

		}
	}
	return string(buf), nil
}

// A Flag parses a list of string arguments encoded with Join.
// It is useful for flags like cmd/link's -extldflags.
type Flag []string

var _ flag.Value = (*Flag)(nil)

func (f *Flag) Set(v string) error {
	fs, err := Split(v)
	if err != nil {
		return err
	}
	*f = fs[:len(fs):len(fs)]
	return nil

shift

set -e

export BUILD_GOOS=${GOOS:-linux}
export BUILD_GOARCH=${GOARCH:-amd64}
GOBINARY=${GOBINARY:-go}
GOPKG="$GOPATH/pkg"
BUILDINFO=${BUILDINFO:-""}
STATIC=${STATIC:-1}
LDFLAGS=${LDFLAGS:--extldflags -static}
GOBUILDFLAGS=${GOBUILDFLAGS:-""}
# Split GOBUILDFLAGS by spaces into an array called GOBUILDFLAGS_ARRAY.
IFS=' ' read -r -a GOBUILDFLAGS_ARRAY <<< "$GOBUILDFLAGS"

GCFLAGS=${GCFLAGS:-}

	-dumpdep
		Dump symbol dependency graph.
	-extar ar
		Set the external archive program (default "ar").
		Used only for -buildmode=c-archive.
	-extld linker
		Set the external linker (default "clang" or "gcc").
	-extldflags flags
		Set space-separated flags to pass to the external linker.
	-f
		Ignore version mismatch in the linked archives.
	-g
		Disable Go package data checks.
	-importcfg file
		Read import configuration from file.