pkg/bisect: use default compiler during bisection where possible

This allows us to bisect at least recently introduced bugs, where the
manager that found the bug uses a non standard compiler. This is usefull
during development of a new sanitizer for which a compiler with
non-upstreamed patches is required.

1 files changed, 50 insertions, 0 deletions

diff --git a/pkg/vcs/linux_test.go b/pkg/vcs/linux_test.go
new file mode 100644
index 000000000..1865aa2d6
--- /dev/null
+++ b/pkg/vcs/linux_test.go
@@ -0,0 +1,50 @@
+// Copyright 2022 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package vcs
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestClangVersion(t *testing.T) {
+	defaultCompiler := "/some/default/compiler"
+	binDir := "/some/dir/"
+	tags := make(map[string]bool)
+
+	// No tags case.
+	actual := linuxClangPath(tags, binDir, defaultCompiler)
+	expected := binDir + "llvm-9.0.1/bin/clang"
+	assert.Equal(t, actual, expected, "unexpected clang path")
+
+	// Recent tag case.
+	tags["v5.9"] = true
+	actual = linuxClangPath(tags, binDir, defaultCompiler)
+	expected = defaultCompiler
+	assert.Equal(t, actual, expected, "unexpected clang path")
+}
+
+func TestGCCVersion(t *testing.T) {
+	defaultCompiler := "/some/default/compiler"
+	binDir := "/some/dir/"
+	tags := make(map[string]bool)
+
+	// No tags case.
+	actual := linuxGCCPath(tags, binDir, defaultCompiler)
+	expected := binDir + "gcc-5.5.0/bin/gcc"
+	assert.Equal(t, actual, expected, "unexpected gcc path")
+
+	// Somewhat old tag case.
+	tags["v4.12"] = true
+	actual = linuxGCCPath(tags, binDir, defaultCompiler)
+	expected = binDir + "gcc-8.1.0/bin/gcc"
+	assert.Equal(t, actual, expected, "unexpected gcc path")
+
+	// Recent tag case.
+	tags["v5.9"] = true
+	actual = linuxGCCPath(tags, binDir, defaultCompiler)
+	expected = defaultCompiler
+	assert.Equal(t, actual, expected, "unexpected gcc path")
+}