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net: improve documentation of netgo/netcgo build tags #69682

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net: improve documentation of netgo/netcgo build tags #69682

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net: improve documentation of netgo and netcgo build tags
mateusz834 Sep 27, 2024
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mateusz834 Sep 27, 2024
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mateusz834 Sep 27, 2024
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5 changes: 5 additions & 0 deletions src/net/net.go
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Expand Up @@ -68,6 +68,11 @@ GODEBUG environment variable (see package runtime) to go or cgo, as in:

The decision can also be forced while building the Go source tree
by setting the netgo or netcgo build tag.
The netgo build tag disables entirely the use of the native (CGO) resolver,
meaning the Go resolver is the only one that can be used.
With the netcgo build tag the native and the pure Go resolver are compiled into the binary,
but the native (CGO) resolver is preferred over the Go resolver.
With netcgo, the Go resolver can still be forced at runtime with GODEBUG=netdns=go.

A numeric netdns setting, as in GODEBUG=netdns=1, causes the resolver
to print debugging information about its decisions.
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