buildruntime.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  	"fmt"
     9  	"os"
    10  	"strings"
    11  )
    12  
    13  /*
    14   * Helpers for building runtime.
    15   */
    16  
    17  // mkzversion writes zversion.go:
    18  //
    19  //	package sys
    20  //
    21  // (Nothing right now!)
    22  func mkzversion(dir, file string) {
    23  	var buf strings.Builder
    24  	writeHeader(&buf)
    25  	fmt.Fprintf(&buf, "package sys\n")
    26  	writefile(buf.String(), file, writeSkipSame)
    27  }
    28  
    29  // mkbuildcfg writes internal/buildcfg/zbootstrap.go:
    30  //
    31  //	package buildcfg
    32  //
    33  //	const defaultGOROOT = <goroot>
    34  //	const defaultGO386 = <go386>
    35  //	...
    36  //	const defaultGOOS = runtime.GOOS
    37  //	const defaultGOARCH = runtime.GOARCH
    38  //
    39  // The use of runtime.GOOS and runtime.GOARCH makes sure that
    40  // a cross-compiled compiler expects to compile for its own target
    41  // system. That is, if on a Mac you do:
    42  //
    43  //	GOOS=linux GOARCH=ppc64 go build cmd/compile
    44  //
    45  // the resulting compiler will default to generating linux/ppc64 object files.
    46  // This is more useful than having it default to generating objects for the
    47  // original target (in this example, a Mac).
    48  func mkbuildcfg(file string) {
    49  	var buf strings.Builder
    50  	writeHeader(&buf)
    51  	fmt.Fprintf(&buf, "package buildcfg\n")
    52  	fmt.Fprintln(&buf)
    53  	fmt.Fprintf(&buf, "import \"runtime\"\n")
    54  	fmt.Fprintln(&buf)
    55  	fmt.Fprintf(&buf, "const DefaultGO386 = `%s`\n", go386)
    56  	fmt.Fprintf(&buf, "const DefaultGOAMD64 = `%s`\n", goamd64)
    57  	fmt.Fprintf(&buf, "const DefaultGOARM = `%s`\n", goarm)
    58  	fmt.Fprintf(&buf, "const DefaultGOARM64 = `%s`\n", goarm64)
    59  	fmt.Fprintf(&buf, "const DefaultGOMIPS = `%s`\n", gomips)
    60  	fmt.Fprintf(&buf, "const DefaultGOMIPS64 = `%s`\n", gomips64)
    61  	fmt.Fprintf(&buf, "const DefaultGOPPC64 = `%s`\n", goppc64)
    62  	fmt.Fprintf(&buf, "const DefaultGORISCV64 = `%s`\n", goriscv64)
    63  	fmt.Fprintf(&buf, "const defaultGOEXPERIMENT = `%s`\n", goexperiment)
    64  	fmt.Fprintf(&buf, "const defaultGO_EXTLINK_ENABLED = `%s`\n", goextlinkenabled)
    65  	fmt.Fprintf(&buf, "const defaultGO_LDSO = `%s`\n", defaultldso)
    66  	fmt.Fprintf(&buf, "const version = `%s`\n", findgoversion())
    67  	fmt.Fprintf(&buf, "const defaultGOOS = runtime.GOOS\n")
    68  	fmt.Fprintf(&buf, "const defaultGOARCH = runtime.GOARCH\n")
    69  	fmt.Fprintf(&buf, "const DefaultGOFIPS140 = `%s`\n", gofips140)
    70  	fmt.Fprintf(&buf, "const DefaultCGO_ENABLED = %s\n", quote(os.Getenv("CGO_ENABLED")))
    71  
    72  	writefile(buf.String(), file, writeSkipSame)
    73  }
    74  
    75  // mkobjabi writes cmd/internal/objabi/zbootstrap.go:
    76  //
    77  //	package objabi
    78  //
    79  // (Nothing right now!)
    80  func mkobjabi(file string) {
    81  	var buf strings.Builder
    82  	writeHeader(&buf)
    83  	fmt.Fprintf(&buf, "package objabi\n")
    84  
    85  	writefile(buf.String(), file, writeSkipSame)
    86  }
    87
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