runtime: make tests that invoke 'go build' module-agnostic

In module mode, building the current directory requires a go.mod file
(in order to determine the import path of the package).

Change the tests to pass explicit file arguments instead, since those
can be built in module mode without defining a module.

Updates golang#30228

Change-Id: I680c658d1f79645f73ad4d1e88189ea50a4852e9
Reviewed-on: https://go-review.googlesource.com/c/162837
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

src/runtime/crash_unix_test.go

@@ -63,7 +63,7 @@ func TestCrashDumpsAllThreads(t *testing.T) {
 		t.Fatalf("failed to create Go file: %v", err)
 	}
 
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {

src/runtime/runtime-gdb_test.go

@@ -156,7 +156,7 @@ func testGdbPython(t *testing.T, cgo bool) {
 	}
 	nLines := lastLine(src)
 
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {
@@ -337,7 +337,7 @@ func TestGdbBacktrace(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {
@@ -408,7 +408,7 @@ func TestGdbAutotmpTypes(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {
@@ -474,7 +474,7 @@ func TestGdbConst(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {
@@ -539,7 +539,7 @@ func TestGdbPanic(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
-	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "a.exe", "main.go")
 	cmd.Dir = dir
 	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
 	if err != nil {