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cmd/cgo: clarify implicit "cgo" build constraint #24072

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cmd/cgo: clarify implicit "cgo" build constraint #24072

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cmd/cgo: clarify implicit "cgo" build constraint
ikkerens Feb 23, 2018
0bf7571
cmd/cgo: applied alternative wording to cgo constraint
ikkerens Feb 23, 2018
5a13f00
cmd/cgo: improved formatting & removed whitespace
ikkerens Feb 23, 2018
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6 changes: 5 additions & 1 deletion src/cmd/cgo/doc.go
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Expand Up @@ -109,7 +109,11 @@ it is expected to work. It is disabled by default when
cross-compiling. You can control this by setting the CGO_ENABLED
environment variable when running the go tool: set it to 1 to enable
the use of cgo, and to 0 to disable it. The go tool will set the
build constraint "cgo" if cgo is enabled.
build constraint "cgo" if cgo is enabled. The special import "C"
implies the "cgo" build constraint, as though the file also said
"// +build cgo". Therefore, if cgo is disabled, files that import
"C" will not be built by the go tool. (For more about build constraints
see https://golang.org/pkg/go/build/#hdr-Build_Constraints).
When cross-compiling, you must specify a C cross-compiler for cgo to
use. You can do this by setting the generic CC_FOR_TARGET or the
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