/usr/share/gocode/src/github.com/constabulary/gb/cgo.go is in golang-github-constabulary-gb-dev 0.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
)
func cgo(pkg *Package) (*Action, []string, []string, error) {
switch {
case goversion == 1.4:
return cgo14(pkg)
case goversion > 1.4:
return cgo15(pkg)
default:
return nil, nil, nil, errors.Errorf("unsupported Go version: %v", runtime.Version())
}
}
// cgo produces a an Action representing the cgo steps
// an ofile representing the result of the cgo steps
// a set of .go files for compilation, and an error.
func cgo14(pkg *Package) (*Action, []string, []string, error) {
// collect cflags and ldflags from the package
// the environment, and pkg-config.
cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoLDFLAGS := cflags(pkg, false)
pcCFLAGS, pcLDFLAGS, err := pkgconfig(pkg)
if err != nil {
return nil, nil, nil, err
}
cgoCFLAGS = append(cgoCFLAGS, pcCFLAGS...)
cgoLDFLAGS = append(cgoLDFLAGS, pcLDFLAGS...)
runcgo1 := []*Action{
&Action{
Name: "runcgo1: " + pkg.ImportPath,
Run: func() error { return runcgo1(pkg, cgoCFLAGS, cgoLDFLAGS) },
}}
workdir := cgoworkdir(pkg)
defun := filepath.Join(workdir, "_cgo_defun.o")
rundefun := Action{
Name: "cc: " + pkg.ImportPath + ": _cgo_defun_c",
Deps: runcgo1,
Run: func() error { return pkg.tc.Cc(pkg, defun, filepath.Join(workdir, "_cgo_defun.c")) },
}
cgofiles := []string{filepath.Join(workdir, "_cgo_gotypes.go")}
for _, f := range pkg.CgoFiles {
cgofiles = append(cgofiles, filepath.Join(workdir, stripext(f)+".cgo1.go"))
}
cfiles := []string{
filepath.Join(workdir, "_cgo_main.c"),
filepath.Join(workdir, "_cgo_export.c"),
}
cfiles = append(cfiles, pkg.CFiles...)
for _, f := range pkg.CgoFiles {
cfiles = append(cfiles, filepath.Join(workdir, stripext(f)+".cgo2.c"))
}
cflags := append(cgoCPPFLAGS, cgoCFLAGS...)
cxxflags := append(cgoCPPFLAGS, cgoCXXFLAGS...)
gcc1, ofiles := cgocc(pkg, cflags, cxxflags, cfiles, pkg.CXXFiles, runcgo1...)
ofiles = append(ofiles, pkg.SysoFiles...)
ofile := filepath.Join(filepath.Dir(ofiles[0]), "_cgo_.o")
gcc2 := Action{
Name: "gccld: " + pkg.ImportPath + ": _cgo_.o",
Deps: gcc1,
Run: func() error { return gccld(pkg, cgoCFLAGS, cgoLDFLAGS, ofile, ofiles) },
}
dynout := filepath.Join(workdir, "_cgo_import.c")
imports := stripext(dynout) + ".o"
runcgo2 := Action{
Name: "runcgo2: " + pkg.ImportPath,
Deps: []*Action{&gcc2},
Run: func() error {
if err := runcgo2(pkg, dynout, ofile); err != nil {
return err
}
return pkg.tc.Cc(pkg, imports, dynout)
},
}
allo := filepath.Join(filepath.Dir(ofiles[0]), "_all.o")
action := Action{
Name: "rungcc3: " + pkg.ImportPath,
Deps: []*Action{&runcgo2, &rundefun},
Run: func() error {
return rungcc3(pkg, pkg.Dir, allo, ofiles[1:]) // skip _cgo_main.o
},
}
return &action, []string{defun, imports, allo}, cgofiles, nil
}
// cgo produces a an Action representing the cgo steps
// an ofile representing the result of the cgo steps
// a set of .go files for compilation, and an error.
func cgo15(pkg *Package) (*Action, []string, []string, error) {
// collect cflags and ldflags from the package
// the environment, and pkg-config.
cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoLDFLAGS := cflags(pkg, false)
pcCFLAGS, pcLDFLAGS, err := pkgconfig(pkg)
if err != nil {
return nil, nil, nil, err
}
cgoCFLAGS = append(cgoCFLAGS, pcCFLAGS...)
cgoLDFLAGS = append(cgoLDFLAGS, pcLDFLAGS...)
runcgo1 := []*Action{
&Action{
Name: "runcgo1: " + pkg.ImportPath,
Run: func() error { return runcgo1(pkg, cgoCFLAGS, cgoLDFLAGS) },
},
}
workdir := cgoworkdir(pkg)
cgofiles := []string{filepath.Join(workdir, "_cgo_gotypes.go")}
for _, f := range pkg.CgoFiles {
cgofiles = append(cgofiles, filepath.Join(workdir, stripext(f)+".cgo1.go"))
}
cfiles := []string{
filepath.Join(workdir, "_cgo_main.c"),
filepath.Join(workdir, "_cgo_export.c"),
}
cfiles = append(cfiles, pkg.CFiles...)
for _, f := range pkg.CgoFiles {
cfiles = append(cfiles, filepath.Join(workdir, stripext(f)+".cgo2.c"))
}
cflags := append(cgoCPPFLAGS, cgoCFLAGS...)
cxxflags := append(cgoCPPFLAGS, cgoCXXFLAGS...)
gcc1, ofiles := cgocc(pkg, cflags, cxxflags, cfiles, pkg.CXXFiles, runcgo1...)
ofiles = append(ofiles, pkg.SysoFiles...)
ofile := filepath.Join(filepath.Dir(ofiles[0]), "_cgo_.o")
gcc2 := Action{
Name: "gccld: " + pkg.ImportPath + ": _cgo_.o",
Deps: gcc1,
Run: func() error { return gccld(pkg, cgoCFLAGS, cgoLDFLAGS, ofile, ofiles) },
}
dynout := filepath.Join(workdir, "_cgo_import.go")
runcgo2 := Action{
Name: "runcgo2: " + pkg.ImportPath,
Deps: []*Action{&gcc2},
Run: func() error { return runcgo2(pkg, dynout, ofile) },
}
cgofiles = append(cgofiles, dynout)
allo := filepath.Join(filepath.Dir(ofiles[0]), "_all.o")
action := Action{
Name: "rungcc3: " + pkg.ImportPath,
Deps: []*Action{&runcgo2},
Run: func() error {
return rungcc3(pkg, pkg.Dir, allo, ofiles[1:]) // skip _cgo_main.o
},
}
return &action, []string{allo}, cgofiles, nil
}
// cgocc compiles all .c files.
// TODO(dfc) cxx not done
func cgocc(pkg *Package, cflags, cxxflags, cfiles, cxxfiles []string, deps ...*Action) ([]*Action, []string) {
workdir := cgoworkdir(pkg)
var cc []*Action
var ofiles []string
for _, cfile := range cfiles {
cfile := cfile
ofile := filepath.Join(workdir, stripext(filepath.Base(cfile))+".o")
ofiles = append(ofiles, ofile)
cc = append(cc, &Action{
Name: "rungcc1: " + pkg.ImportPath + ": " + cfile,
Deps: deps,
Run: func() error { return rungcc1(pkg, cflags, ofile, cfile) },
})
}
for _, cxxfile := range cxxfiles {
cxxfile := cxxfile
ofile := filepath.Join(workdir, stripext(filepath.Base(cxxfile))+".o")
ofiles = append(ofiles, ofile)
cc = append(cc, &Action{
Name: "rung++1: " + pkg.ImportPath + ": " + cxxfile,
Deps: deps,
Run: func() error { return rungpp1(pkg, cxxflags, ofile, cxxfile) },
})
}
return cc, ofiles
}
// rungcc1 invokes gcc to compile cfile into ofile
func rungcc1(pkg *Package, cgoCFLAGS []string, ofile, cfile string) error {
args := []string{"-g", "-O2",
"-I", pkg.Dir,
"-I", filepath.Dir(ofile),
}
args = append(args, cgoCFLAGS...)
args = append(args,
"-o", ofile,
"-c", cfile,
)
t0 := time.Now()
gcc := gccCmd(pkg, pkg.Dir)
var buf bytes.Buffer
err := runOut(&buf, pkg.Dir, nil, gcc[0], append(gcc[1:], args...)...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
pkg.Record(gcc[0], time.Since(t0))
return err
}
// rungpp1 invokes g++ to compile cfile into ofile
func rungpp1(pkg *Package, cgoCFLAGS []string, ofile, cfile string) error {
args := []string{"-g", "-O2",
"-I", pkg.Dir,
"-I", filepath.Dir(ofile),
}
args = append(args, cgoCFLAGS...)
args = append(args,
"-o", ofile,
"-c", cfile,
)
t0 := time.Now()
gxx := gxxCmd(pkg, pkg.Dir)
var buf bytes.Buffer
err := runOut(&buf, pkg.Dir, nil, gxx[0], append(gxx[1:], args...)...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
pkg.Record(gxx[0], time.Since(t0))
return err
}
// gccld links the o files from rungcc1 into a single _cgo_.o.
func gccld(pkg *Package, cgoCFLAGS, cgoLDFLAGS []string, ofile string, ofiles []string) error {
args := []string{}
args = append(args, "-o", ofile)
args = append(args, ofiles...)
args = append(args, cgoLDFLAGS...) // this has to go at the end, because reasons!
t0 := time.Now()
var cmd []string
if len(pkg.CXXFiles) > 0 || len(pkg.SwigCXXFiles) > 0 {
cmd = gxxCmd(pkg, pkg.Dir)
} else {
cmd = gccCmd(pkg, pkg.Dir)
}
var buf bytes.Buffer
err := runOut(&buf, pkg.Dir, nil, cmd[0], append(cmd[1:], args...)...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
pkg.Record("gccld", time.Since(t0))
return err
}
// rungcc3 links all previous ofiles together with libgcc into a single _all.o.
func rungcc3(pkg *Package, dir string, ofile string, ofiles []string) error {
args := []string{}
args = append(args, "-o", ofile)
args = append(args, ofiles...)
args = append(args, "-Wl,-r", "-nostdlib")
if gccSupportsNoPie(pkg) {
args = append(args, "-no-pie")
}
var cmd []string
if len(pkg.CXXFiles) > 0 || len(pkg.SwigCXXFiles) > 0 {
cmd = gxxCmd(pkg, dir)
} else {
cmd = gccCmd(pkg, dir)
}
if !strings.HasPrefix(cmd[0], "clang") {
libgcc, err := libgcc(pkg.Context)
if err != nil {
return nil
}
args = append(args, libgcc)
}
t0 := time.Now()
var buf bytes.Buffer
err := runOut(&buf, dir, nil, cmd[0], append(cmd[1:], args...)...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
pkg.Record("gcc3", time.Since(t0))
return err
}
// libgcc returns the value of gcc -print-libgcc-file-name.
func libgcc(ctx *Context) (string, error) {
args := []string{
"-print-libgcc-file-name",
}
var buf bytes.Buffer
cmd := gccCmd(&Package{Context: ctx}, "") // TODO(dfc) hack
err := runOut(&buf, ".", nil, cmd[0], args...)
return strings.TrimSpace(buf.String()), err
}
// gccSupportsNoPie check if the -no-pie option is supported. On systems with
// PIE (position independent executables) enabled by default, -no-pie must be
// passed when doing a partial link with -Wl,-r.
func gccSupportsNoPie(pkg *Package) bool {
cmd := gccCmd(pkg, "")
args := []string{
"-no-pie",
"-fsyntax-only",
"-xc",
"-",
}
return exec.Command(cmd[0], append(cmd[1:], args...)...).Run() == nil
}
func cgotool(ctx *Context) string {
return filepath.Join(runtime.GOROOT(), "pkg", "tool", ctx.gohostos+"_"+ctx.gohostarch, "cgo")
}
// envList returns the value of the given environment variable broken
// into fields, using the default value when the variable is empty.
func envList(key, def string) []string {
v := os.Getenv(key)
if v == "" {
v = def
}
return strings.Fields(v)
}
// Return the flags to use when invoking the C or C++ compilers, or cgo.
func cflags(p *Package, def bool) (cppflags, cflags, cxxflags, ldflags []string) {
var defaults string
if def {
defaults = "-g -O2"
}
cppflags = stringList(envList("CGO_CPPFLAGS", ""), p.CgoCPPFLAGS)
cflags = stringList(envList("CGO_CFLAGS", defaults), p.CgoCFLAGS)
cxxflags = stringList(envList("CGO_CXXFLAGS", defaults), p.CgoCXXFLAGS)
ldflags = stringList(envList("CGO_LDFLAGS", defaults), p.CgoLDFLAGS)
return
}
// call pkg-config and return the cflags and ldflags.
func pkgconfig(p *Package) ([]string, []string, error) {
if len(p.CgoPkgConfig) == 0 {
return nil, nil, nil // nothing to do
}
args := []string{
"--cflags",
}
args = append(args, p.CgoPkgConfig...)
var out bytes.Buffer
err := runOut(&out, p.Dir, nil, "pkg-config", args...)
if err != nil {
return nil, nil, err
}
cflags := strings.Fields(out.String())
args = []string{
"--libs",
}
args = append(args, p.CgoPkgConfig...)
out.Reset()
err = runOut(&out, p.Dir, nil, "pkg-config", args...)
if err != nil {
return nil, nil, err
}
ldflags := strings.Fields(out.String())
return cflags, ldflags, nil
}
func quoteFlags(flags []string) []string {
quoted := make([]string, len(flags))
for i, f := range flags {
quoted[i] = strconv.Quote(f)
}
return quoted
}
// runcgo1 invokes the cgo tool to process pkg.CgoFiles.
func runcgo1(pkg *Package, cflags, ldflags []string) error {
cgo := cgotool(pkg.Context)
workdir := cgoworkdir(pkg)
if err := mkdir(workdir); err != nil {
return err
}
args := []string{"-objdir", workdir}
switch {
case goversion == 1.4:
args = append(args,
"--",
"-I", pkg.Dir,
)
case goversion > 1.4:
args = append(args,
"-importpath", pkg.ImportPath,
"--",
"-I", workdir,
"-I", pkg.Dir,
)
default:
return errors.Errorf("unsupported Go version: %v", runtime.Version())
}
args = append(args, cflags...)
args = append(args, pkg.CgoFiles...)
cgoenv := []string{
"CGO_CFLAGS=" + strings.Join(quoteFlags(cflags), " "),
"CGO_LDFLAGS=" + strings.Join(quoteFlags(ldflags), " "),
}
var buf bytes.Buffer
err := runOut(&buf, pkg.Dir, cgoenv, cgo, args...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
return err
}
// runcgo2 invokes the cgo tool to create _cgo_import.go
func runcgo2(pkg *Package, dynout, ofile string) error {
cgo := cgotool(pkg.Context)
workdir := cgoworkdir(pkg)
args := []string{
"-objdir", workdir,
}
switch {
case goversion == 1.4:
args = append(args,
"-dynimport", ofile,
"-dynout", dynout,
)
case goversion > 1.4:
args = append(args,
"-dynpackage", pkg.Name,
"-dynimport", ofile,
"-dynout", dynout,
)
default:
return errors.Errorf("unsuppored Go version: %v", runtime.Version())
}
var buf bytes.Buffer
err := runOut(&buf, pkg.Dir, nil, cgo, args...)
if err != nil {
fmt.Fprintf(os.Stderr, "# %s\n", pkg.ImportPath)
io.Copy(os.Stderr, &buf)
}
return err
}
// cgoworkdir returns the cgo working directory for this package.
func cgoworkdir(pkg *Package) string {
return filepath.Join(pkg.Workdir(), pkg.pkgname(), "_cgo")
}
// gccCmd returns a gcc command line prefix.
func gccCmd(pkg *Package, objdir string) []string {
return ccompilerCmd(pkg, "CC", defaultCC, objdir)
}
// gxxCmd returns a g++ command line prefix.
func gxxCmd(pkg *Package, objdir string) []string {
return ccompilerCmd(pkg, "CXX", defaultCXX, objdir)
}
// ccompilerCmd returns a command line prefix for the given environment
// variable and using the default command when the variable is empty.
func ccompilerCmd(pkg *Package, envvar, defcmd, objdir string) []string {
compiler := envList(envvar, defcmd)
a := []string{compiler[0]}
if objdir != "" {
a = append(a, "-I", objdir)
}
a = append(a, compiler[1:]...)
// Definitely want -fPIC but on Windows gcc complains
// "-fPIC ignored for target (all code is position independent)"
if pkg.gotargetos != "windows" {
a = append(a, "-fPIC")
}
a = append(a, gccArchArgs(pkg.gotargetarch)...)
// gcc-4.5 and beyond require explicit "-pthread" flag
// for multithreading with pthread library.
switch pkg.gotargetos {
case "windows":
a = append(a, "-mthreads")
default:
a = append(a, "-pthread")
}
if strings.Contains(a[0], "clang") {
// disable ASCII art in clang errors, if possible
a = append(a, "-fno-caret-diagnostics")
// clang is too smart about command-line arguments
a = append(a, "-Qunused-arguments")
}
// disable word wrapping in error messages
a = append(a, "-fmessage-length=0")
// On OS X, some of the compilers behave as if -fno-common
// is always set, and the Mach-O linker in 6l/8l assumes this.
// See https://golang.org/issue/3253.
if pkg.gotargetos == "darwin" {
a = append(a, "-fno-common")
}
return a
}
// linkCmd returns the name of the binary to use for linking for the given
// environment variable and using the default command when the variable is
// empty.
func linkCmd(pkg *Package, envvar, defcmd string) string {
compiler := envList(envvar, defcmd)
return compiler[0]
}
// gccArchArgs returns arguments to pass to gcc based on the architecture.
func gccArchArgs(goarch string) []string {
switch goarch {
case "386":
return []string{"-m32"}
case "amd64", "amd64p32":
return []string{"-m64"}
case "arm":
return []string{"-marm"} // not thumb
}
return nil
}
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