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cmd/cgo: check whether C compiler exists

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Currently we print a cryptic message if a C compiler doesn't exist.
This patch adds more graceful handling.

Fixes #44271

Change-Id: I44f16ef6eb2853fee22fa1d996e41ec6c9ee82f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/301249
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Andrey Bokhanko 2021-03-13 00:21:18 +08:00 committed by Ian Lance Taylor
parent a5df88355c
commit 4313c28861
1 changed files with 9 additions and 0 deletions
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9
src/cmd/cgo/main.go
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@ -20,6 +20,7 @@ import (
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"reflect"
"runtime"
@ -302,6 +303,14 @@ func main() {
p := newPackage(args[:i])
// We need a C compiler to be available. Check this.
gccName := p.gccBaseCmd()[0]
_, err := exec.LookPath(gccName)
if err != nil {
fatalf("C compiler %q not found: %v", gccName, err)
os.Exit(2)
}
// Record CGO_LDFLAGS from the environment for external linking.
if ldflags := os.Getenv("CGO_LDFLAGS"); ldflags != "" {
args, err := splitQuoted(ldflags)