stderr no-such-warning

-- go.mod --
module ldflag

-- bad/bad.go --
package bad

// #cgo LDFLAGS: -Wno-such-warning -Wno-unknown-warning
import "C"

func F() {}
-- ok/ok.go --
package ok

import "C"

func F() {}
-- main.go --
package main

import _ "ldflag/ok"

[!GOOS:darwin] skip
[!cgo] skip

! go build
stderr 'invalid flag in #cgo LDFLAGS: -lto_library'

-- go.mod --
module ldflag

-- main.go --
package main

// #cgo CFLAGS: -flto
// #cgo LDFLAGS: -lto_library bad.dylib
import "C"

// license that can be found in the LICENSE file.

// Package cmdflag handles flag processing common to several go tools.
package cmdflag

import (
	"errors"
	"flag"
	"fmt"
	"strings"
)

// The flag handling part of go commands such as test is large and distracting.
// We can't use the standard flag package because some of the flags from

type boolFlag interface {
	flag.Value
	IsBoolFlag() bool
}

// SetFromGOFLAGS sets the flags in the given flag set using settings in $GOFLAGS.
func SetFromGOFLAGS(flags *flag.FlagSet) {
	InitGOFLAGS()

	// This loop is similar to flag.Parse except that it ignores
	// unknown flags found in goflags, so that setting, say, GOFLAGS=-ldflags=-w

	"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.

			// This is the error from cgo.
			continue
		}

		// We passed -ldflags=-v to see the external linker invocation,
		// which should not include -badflag.
		if bytes.Contains(line, []byte("-badflag")) {
			t.Error("output should not mention -badflag")
		}

		// Also check for compiler errors, just in case.
		// GCC says "unrecognized command line option".

	return gf.Value.String() != "0"
}

var (
	klogFlagSet     = &goflag.FlagSet{}
	klogFlagSetOnce = sync.Once{}
)

// KlogVerboseFlag returns verbose flag from the klog library.
// After parsing it contains the parsed verbosity value.
func klogVerboseFlag() *goflag.Flag {
	klogFlagSetOnce.Do(func() {
		klog.InitFlags(klogFlagSet)
	})
	// --v= flag of klog.
	return klogFlagSet.Lookup("v")
}

Harshavardhana <******@****.***> 1655421048 -0700

/*
// intentionally write the same LDFLAGS differently
// to test correct handling of LDFLAGS.
#cgo linux LDFLAGS: -L. -lcgosotest
#cgo dragonfly LDFLAGS: -L. -l cgosotest
#cgo freebsd LDFLAGS: -L. -l cgosotest
#cgo openbsd LDFLAGS: -L. -l cgosotest
#cgo solaris LDFLAGS: -L. -lcgosotest
#cgo netbsd LDFLAGS: -L. libcgosotest.so
#cgo darwin LDFLAGS: -L. libcgosotest.dylib
#cgo windows LDFLAGS: -L. libcgosotest.a

# -ldflags applies to link of command
go build -a -n -ldflags=-X=math.pi=3 my/cmd/prog
stderr 'link.* -X=math.pi=3'

# -ldflags applies to link of command even with strange directory name
go build -a -n -ldflags=-X=math.pi=3 my/cmd/prog/
stderr 'link.* -X=math.pi=3'

# -ldflags applies to current directory
cd my/cmd/prog
go build -a -n -ldflags=-X=math.pi=3
stderr 'link.* -X=math.pi=3'