// Copyright 2012 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package main import ( "fmt" "os" "strings" ) /* * Helpers for building runtime. */ // mkzversion writes zversion.go: // // package runtime // const defaultGoroot = <goroot> // const theVersion = <version> // const goexperiment = <goexperiment> // const stackGuardMultiplier = <multiplier value> // const buildVersion = <build version> // func mkzversion(dir, file string) { out := fmt.Sprintf( "// auto generated by go tool dist\n"+ "\n"+ "package runtime\n"+ "\n"+ "const defaultGoroot = `%s`\n"+ "const theVersion = `%s`\n"+ "const goexperiment = `%s`\n"+ "const stackGuardMultiplier = %d\n"+ "var buildVersion = theVersion\n", goroot_final, findgoversion(), os.Getenv("GOEXPERIMENT"), stackGuardMultiplier()) writefile(out, file, writeSkipSame) } // mkzbootstrap writes cmd/internal/obj/zbootstrap.go: // // package obj // // const defaultGOROOT = <goroot> // const defaultGO386 = <go386> // const defaultGOARM = <goarm> // const defaultGOOS = runtime.GOOS // const defaultGOARCH = runtime.GOARCH // const defaultGO_EXTLINK_ENABLED = <goextlinkenabled> // const version = <version> // const stackGuardMultiplier = <multiplier value> // const goexperiment = <goexperiment> // // The use of runtime.GOOS and runtime.GOARCH makes sure that // a cross-compiled compiler expects to compile for its own target // system. That is, if on a Mac you do: // // GOOS=linux GOARCH=ppc64 go build cmd/compile // // the resulting compiler will default to generating linux/ppc64 object files. // This is more useful than having it default to generating objects for the // original target (in this example, a Mac). func mkzbootstrap(file string) { out := fmt.Sprintf( "// auto generated by go tool dist\n"+ "\n"+ "package obj\n"+ "\n"+ "import \"runtime\"\n"+ "\n"+ "const defaultGOROOT = `%s`\n"+ "const defaultGO386 = `%s`\n"+ "const defaultGOARM = `%s`\n"+ "const defaultGOOS = runtime.GOOS\n"+ "const defaultGOARCH = runtime.GOARCH\n"+ "const defaultGO_EXTLINK_ENABLED = `%s`\n"+ "const version = `%s`\n"+ "const stackGuardMultiplier = %d\n"+ "const goexperiment = `%s`\n", goroot_final, go386, goarm, goextlinkenabled, findgoversion(), stackGuardMultiplier(), os.Getenv("GOEXPERIMENT")) writefile(out, file, writeSkipSame) } // stackGuardMultiplier returns a multiplier to apply to the default // stack guard size. Larger multipliers are used for non-optimized // builds that have larger stack frames. func stackGuardMultiplier() int { for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") { if s == "-N" { return 2 } } return 1 }