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go/build: support compiler as build constraint

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This supports writing different .c/.s code when using gccgo.

R=golang-dev, dsymonds, iant, rsc
CC=golang-dev
https://golang.org/cl/6823055
This commit is contained in:
Ian Lance Taylor 2012-11-01 11:12:15 -07:00
parent b11f85a8aa
commit f07f9de8ec
2 changed files with 4 additions and 1 deletions
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4
src/pkg/go/build/build.go
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@ -897,6 +897,8 @@ func splitQuoted(s string) (r []string, err error) {
// $GOARCH
// cgo (if cgo is enabled)
// !cgo (if cgo is disabled)
// ctxt.Compiler
// !ctxt.Compiler
// tag (if tag is listed in ctxt.BuildTags)
// !tag (if tag is not listed in ctxt.BuildTags)
// a comma-separated list of any of these
@ -928,7 +930,7 @@ func (ctxt *Context) match(name string) bool {
if ctxt.CgoEnabled && name == "cgo" {
return true
}
if name == ctxt.GOOS || name == ctxt.GOARCH {
if name == ctxt.GOOS || name == ctxt.GOARCH || name == ctxt.Compiler {
return true
}

1
src/pkg/go/build/doc.go
View File

@ -88,6 +88,7 @@
//
// - the target operating system, as spelled by runtime.GOOS
// - the target architecture, as spelled by runtime.GOARCH
// - the compiler being used, currently either "gc" or "gccgo"
// - "cgo", if ctxt.CgoEnabled is true
// - any additional words listed in ctxt.BuildTags
//