Revert "cmd/link: fix GC data reading from shared library"

This reverts CL 240462.

Reason for revert: test fails on PPC64LE.

Updates #39927.

Change-Id: I4f14fd0c36e604a80ae9f2f86d1e643e28945e93
Reviewed-on: https://go-review.googlesource.com/c/go/+/240616
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

3 files changed, 0 insertions, 60 deletions

diff --git a/misc/cgo/testshared/shared_test.go b/misc/cgo/testshared/shared_test.go
index f8dabbe7a0..fda3d2ce76 100644
--- a/misc/cgo/testshared/shared_test.go
+++ b/misc/cgo/testshared/shared_test.go
@@ -38,15 +38,7 @@ var testWork = flag.Bool("testwork", false, "if true, log and do not delete the
 
 // run runs a command and calls t.Errorf if it fails.
 func run(t *testing.T, msg string, args ...string) {
-	runWithEnv(t, msg, nil, args...)
-}
-
-// runWithEnv runs a command under the given environment and calls t.Errorf if it fails.
-func runWithEnv(t *testing.T, msg string, env []string, args ...string) {
 	c := exec.Command(args[0], args[1:]...)
-	if len(env) != 0 {
-		c.Env = append(os.Environ(), env...)
-	}
 	if output, err := c.CombinedOutput(); err != nil {
 		t.Errorf("executing %s (%s) failed %s:\n%s", strings.Join(args, " "), msg, err, output)
 	}
@@ -1042,11 +1034,3 @@ func TestGeneratedHash(t *testing.T) {
 func TestPackageOrder(t *testing.T) {
 	goCmd(t, "install", "-buildmode=shared", "-linkshared", "./issue39777/a", "./issue39777/b")
 }
-
-// Test that GC data are generated correctly by the linker when it needs a type defined in
-// a shared library. See issue 39927.
-func TestGCData(t *testing.T) {
-	goCmd(t, "install", "-buildmode=shared", "-linkshared", "./gcdata/p")
-	goCmd(t, "build", "-linkshared", "./gcdata/main")
-	runWithEnv(t, "running gcdata/main", []string{"GODEBUG=clobberfree=1"}, "./main")
-}
diff --git a/misc/cgo/testshared/testdata/gcdata/main/main.go b/misc/cgo/testshared/testdata/gcdata/main/main.go
deleted file mode 100644
index 394862fd94..0000000000
--- a/misc/cgo/testshared/testdata/gcdata/main/main.go
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Test that GC data is generated correctly for global
-// variables with types defined in a shared library.
-// See issue 39927.
-
-// This test run under GODEBUG=clobberfree=1. The check
-// *x[i] == 12345 depends on this debug mode to clobber
-// the value if the object is freed prematurely.
-
-package main
-
-import (
-	"fmt"
-	"runtime"
-	"testshared/gcdata/p"
-)
-
-var x p.T
-
-func main() {
-	for i := range x {
-		x[i] = new(int)
-		*x[i] = 12345
-	}
-	runtime.GC()
-	runtime.GC()
-	runtime.GC()
-	for i := range x {
-		if *x[i] != 12345 {
-			fmt.Printf("x[%d] == %d, want 12345\n", i, *x[i])
-			panic("FAIL")
-		}
-	}
-}
diff --git a/misc/cgo/testshared/testdata/gcdata/p/p.go b/misc/cgo/testshared/testdata/gcdata/p/p.go
deleted file mode 100644
index 1fee75429e..0000000000
--- a/misc/cgo/testshared/testdata/gcdata/p/p.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package p
-
-type T [10]*int