Source file src/cmd/dist/buildgo.go

     1	// Copyright 2012 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package main
     6	
     7	import (
     8		"bytes"
     9		"fmt"
    10		"os"
    11		"path/filepath"
    12		"sort"
    13		"strings"
    14	)
    15	
    16	/*
    17	 * Helpers for building cmd/go and cmd/cgo.
    18	 */
    19	
    20	// mkzdefaultcc writes zdefaultcc.go:
    21	//
    22	//	package main
    23	//	const defaultCC = <defaultcc>
    24	//	const defaultCXX = <defaultcxx>
    25	//	const defaultPkgConfig = <defaultpkgconfig>
    26	//
    27	// It is invoked to write cmd/go/internal/cfg/zdefaultcc.go
    28	// but we also write cmd/cgo/zdefaultcc.go
    29	func mkzdefaultcc(dir, file string) {
    30		if strings.Contains(file, filepath.FromSlash("go/internal/cfg")) {
    31			var buf bytes.Buffer
    32			fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
    33			fmt.Fprintln(&buf)
    34			fmt.Fprintf(&buf, "package cfg\n")
    35			fmt.Fprintln(&buf)
    36			fmt.Fprintf(&buf, "const DefaultPkgConfig = `%s`\n", defaultpkgconfig)
    37			buf.WriteString(defaultCCFunc("DefaultCC", defaultcc))
    38			buf.WriteString(defaultCCFunc("DefaultCXX", defaultcxx))
    39			writefile(buf.String(), file, writeSkipSame)
    40			return
    41		}
    42	
    43		var buf bytes.Buffer
    44		fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
    45		fmt.Fprintln(&buf)
    46		fmt.Fprintf(&buf, "package main\n")
    47		fmt.Fprintln(&buf)
    48		fmt.Fprintf(&buf, "const defaultPkgConfig = `%s`\n", defaultpkgconfig)
    49		buf.WriteString(defaultCCFunc("defaultCC", defaultcc))
    50		buf.WriteString(defaultCCFunc("defaultCXX", defaultcxx))
    51		writefile(buf.String(), file, writeSkipSame)
    52	}
    53	
    54	func defaultCCFunc(name string, defaultcc map[string]string) string {
    55		var buf bytes.Buffer
    56	
    57		fmt.Fprintf(&buf, "func %s(goos, goarch string) string {\n", name)
    58		fmt.Fprintf(&buf, "\tswitch goos+`/`+goarch {\n")
    59		var keys []string
    60		for k := range defaultcc {
    61			if k != "" {
    62				keys = append(keys, k)
    63			}
    64		}
    65		sort.Strings(keys)
    66		for _, k := range keys {
    67			fmt.Fprintf(&buf, "\tcase %q:\n\t\treturn %q\n", k, defaultcc[k])
    68		}
    69		fmt.Fprintf(&buf, "\t}\n")
    70		fmt.Fprintf(&buf, "\treturn %q\n", defaultcc[""])
    71		fmt.Fprintf(&buf, "}\n")
    72	
    73		return buf.String()
    74	}
    75	
    76	// mkzcgo writes zosarch.go for cmd/go.
    77	func mkzosarch(dir, file string) {
    78		// sort for deterministic zosarch.go file
    79		var list []string
    80		for plat := range cgoEnabled {
    81			list = append(list, plat)
    82		}
    83		sort.Strings(list)
    84	
    85		var buf bytes.Buffer
    86		fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n\n")
    87		fmt.Fprintf(&buf, "package cfg\n\n")
    88		fmt.Fprintf(&buf, "var OSArchSupportsCgo = map[string]bool{\n")
    89		for _, plat := range list {
    90			fmt.Fprintf(&buf, "\t%q: %v,\n", plat, cgoEnabled[plat])
    91		}
    92		fmt.Fprintf(&buf, "}\n")
    93	
    94		writefile(buf.String(), file, writeSkipSame)
    95	}
    96	
    97	// mkzcgo writes zcgo.go for the go/build package:
    98	//
    99	//	package build
   100	//  var cgoEnabled = map[string]bool{}
   101	//
   102	// It is invoked to write go/build/zcgo.go.
   103	func mkzcgo(dir, file string) {
   104		// sort for deterministic zcgo.go file
   105		var list []string
   106		for plat, hasCgo := range cgoEnabled {
   107			if hasCgo {
   108				list = append(list, plat)
   109			}
   110		}
   111		sort.Strings(list)
   112	
   113		var buf bytes.Buffer
   114		fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
   115		fmt.Fprintln(&buf)
   116		fmt.Fprintf(&buf, "package build\n")
   117		fmt.Fprintln(&buf)
   118		fmt.Fprintf(&buf, "const defaultCGO_ENABLED = %q\n", os.Getenv("CGO_ENABLED"))
   119		fmt.Fprintln(&buf)
   120		fmt.Fprintf(&buf, "var cgoEnabled = map[string]bool{\n")
   121		for _, plat := range list {
   122			fmt.Fprintf(&buf, "\t%q: true,\n", plat)
   123		}
   124		fmt.Fprintf(&buf, "}\n")
   125	
   126		writefile(buf.String(), file, writeSkipSame)
   127	}
   128	

View as plain text