| // 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 ( |
| "bytes" |
| "fmt" |
| "os" |
| "strings" |
| ) |
| |
| /* |
| * Helpers for building runtime. |
| */ |
| |
| // mkzversion writes zversion.go: |
| // |
| // package sys |
| // |
| // const TheVersion = <version> |
| // const Goexperiment = <goexperiment> |
| // const StackGuardMultiplier = <multiplier value> |
| // |
| func mkzversion(dir, file string) { |
| var buf bytes.Buffer |
| fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n") |
| fmt.Fprintln(&buf) |
| fmt.Fprintf(&buf, "package sys\n") |
| fmt.Fprintln(&buf) |
| fmt.Fprintf(&buf, "const TheVersion = `%s`\n", findgoversion()) |
| fmt.Fprintf(&buf, "const Goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT")) |
| fmt.Fprintf(&buf, "const StackGuardMultiplier = %d\n", stackGuardMultiplier()) |
| |
| writefile(buf.String(), file, writeSkipSame) |
| } |
| |
| // mkzbootstrap writes cmd/internal/objabi/zbootstrap.go: |
| // |
| // package objabi |
| // |
| // const defaultGOROOT = <goroot> |
| // const defaultGO386 = <go386> |
| // const defaultGOARM = <goarm> |
| // const defaultGOMIPS = <gomips> |
| // const defaultGOMIPS64 = <gomips64> |
| // 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) { |
| var buf bytes.Buffer |
| fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n") |
| fmt.Fprintln(&buf) |
| fmt.Fprintf(&buf, "package objabi\n") |
| fmt.Fprintln(&buf) |
| fmt.Fprintf(&buf, "import \"runtime\"\n") |
| fmt.Fprintln(&buf) |
| fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386) |
| fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm) |
| fmt.Fprintf(&buf, "const defaultGOMIPS = `%s`\n", gomips) |
| fmt.Fprintf(&buf, "const defaultGOMIPS64 = `%s`\n", gomips64) |
| fmt.Fprintf(&buf, "const defaultGOOS = runtime.GOOS\n") |
| fmt.Fprintf(&buf, "const defaultGOARCH = runtime.GOARCH\n") |
| fmt.Fprintf(&buf, "const defaultGO_EXTLINK_ENABLED = `%s`\n", goextlinkenabled) |
| fmt.Fprintf(&buf, "const version = `%s`\n", findgoversion()) |
| fmt.Fprintf(&buf, "const stackGuardMultiplier = %d\n", stackGuardMultiplier()) |
| fmt.Fprintf(&buf, "const goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT")) |
| |
| writefile(buf.String(), 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 { |
| // On AIX, a larger stack is needed for syscalls |
| if goos == "aix" { |
| return 2 |
| } |
| for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") { |
| if s == "-N" { |
| return 2 |
| } |
| } |
| return 1 |
| } |