stdout '^\tbuild\t-ldflags=example\.com/m=-w$'

go build -trimpath
go version -m m$GOEXE
stdout '\tbuild\t-trimpath=true$'

# gccgoflags are not added when gc is used, and vice versa.
# TODO: test gccgo.
go build -gccgoflags=all=UNUSED
go version -m m$GOEXE
! stdout gccgoflags

# Build and tool tags are added but not release tags.
# "race" is included with build tags but not "cgo".
go build -tags=a,b

	"fmt"
	"strings"
)

var (
	BuildAsmflags   PerPackageFlag // -asmflags
	BuildGcflags    PerPackageFlag // -gcflags
	BuildLdflags    PerPackageFlag // -ldflags
	BuildGccgoflags PerPackageFlag // -gccgoflags
)

// A PerPackageFlag is a command-line flag implementation (a flag.Value)
// that allows specifying different effective flags for different packages.
// See 'go help build' for more details about per-package flags.