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go.tools/importer: negate "cgo" build tag to avoid native code in "net".

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This removes the need for the caller to specify CGO_ENABLED=0
in the environment.

R=crawshaw
CC=golang-dev
https://golang.org/cl/13464045
This commit is contained in:
Alan Donovan 2013-09-04 15:20:38 -04:00
parent f9e325b575
commit b21b4e8c88
4 changed files with 11 additions and 25 deletions
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19
cmd/oracle/main.go
View File

@ -51,11 +51,6 @@ Examples:
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
// TODO(adonovan): the caller must---before go/build.init
// runs---specify CGO_ENABLED=0, which entails the "!cgo" go/build
// tag, preferring (dummy) Go to native C implementations of
// cgoLookupHost et al.
func init() {
// If $GOMAXPROCS isn't set, use the full capacity of the machine.
// For small machines, use at least 4 threads.
@ -66,16 +61,6 @@ func init() {
}
runtime.GOMAXPROCS(n)
}
// For now, caller must---before go/build.init runs---specify
// CGO_ENABLED=0, which entails the "!cgo" go/build tag,
// preferring (dummy) Go to native C implementations of
// cgoLookupHost et al.
// TODO(adonovan): make the importer do this.
if os.Getenv("CGO_ENABLED") != "0" {
fmt.Fprint(os.Stderr, "Warning: CGO_ENABLED=0 not specified; "+
"analysis of cgo code may be less precise.\n")
}
}
func main() {
@ -114,14 +99,14 @@ func main() {
// -format flag
if *formatFlag != "json" && *formatFlag != "plain" {
fmt.Fprintf(os.Stderr, "illegal -format value: %q", *formatFlag)
fmt.Fprintf(os.Stderr, "Error: illegal -format value: %q", *formatFlag)
os.Exit(1)
}
// Ask the oracle.
res, err := oracle.Query(args, *modeFlag, *posFlag, ptalog, &build.Default)
if err != nil {
fmt.Fprintln(os.Stderr, err)
fmt.Fprintf(os.Stderr, "Error: %s\n", err)
os.Exit(1)
}

2
cmd/oracle/oracle.el
View File

@ -101,7 +101,7 @@ result."
(message "Running oracle...")
;; Use dynamic binding to modify/restore the environment
(let ((process-environment (list* goroot-env gopath-env "CGO_ENABLED=0" process-environment)))
(let ((process-environment (list* goroot-env gopath-env process-environment)))
(apply #'call-process args)))
(insert "\n")
(compilation-mode)

7
importer/util.go
View File

@ -70,9 +70,14 @@ func init() {
// loadPackage ascertains which files belong to package path, then
// loads, parses and returns them.
func loadPackage(ctxt *build.Context, fset *token.FileSet, path string) (files []*ast.File, err error) {
// Set the "!cgo" go/build tag, preferring (dummy) Go to
// native C implementations of net.cgoLookupHost et al.
ctxt2 := *ctxt
ctxt2.CgoEnabled = false
// TODO(adonovan): fix: Do we need cwd? Shouldn't
// ImportDir(path) / $GOROOT suffice?
bp, err := ctxt.Import(path, cwd, 0)
bp, err := ctxt2.Import(path, cwd, 0)
if _, ok := err.(*build.NoGoError); ok {
return nil, nil // empty directory
}

8
ssa/stdlib_test.go
View File

@ -7,9 +7,7 @@ package ssa_test
// This file runs the SSA builder in sanity-checking mode on all
// packages beneath $GOROOT and prints some summary information.
//
// Run test with GOMAXPROCS=8 and CGO_ENABLED=0. The latter cannot be
// set from the test because it's too late to stop go/build.init()
// from picking up the value from the parent's environment.
// Run test with GOMAXPROCS=8.
import (
"go/build"
@ -52,9 +50,7 @@ func allPackages() []string {
}
func TestStdlib(t *testing.T) {
ctxt := build.Default
ctxt.CgoEnabled = false // mutating a global!
impctx := importer.Config{Build: &ctxt}
impctx := importer.Config{Build: &build.Default}
// Load, parse and type-check the program.
t0 := time.Now()