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b615ad8fd5
GODEBUG=netdns=1 prints a one-time strategy decision. (cgo or go DNS lookups) GODEBUG=netdns=2 prints the per-lookup strategy as a function of the hostname. The new "netcgo" build tag forces cgo DNS lookups. GODEBUG=netdns=go (or existing build tag "netgo") forces Go DNS resolution. GODEBUG=netdns=cgo (or new build tag "netcgo") forces libc DNS resolution. Options can be combined with e.g. GODEBUG=netdns=go+1 or GODEBUG=netdns=2+cgo. Fixes #11322 Fixes #11450 Change-Id: I7a67e9f759fd0a02320e7803f9ded1638b19e861 Reviewed-on: https://go-review.googlesource.com/11584 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
19 lines
370 B
Go
19 lines
370 B
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build netcgo
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package net
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/*
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// Fail if cgo isn't available.
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*/
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import "C"
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// The build tag "netcgo" forces use of the cgo DNS resolver.
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// It is the opposite of "netgo".
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func init() { netCgo = true }
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