[Tests] Skip the newly added test if TSan is enabled

TSan seems to trigger a false positive with this test.

Author: akyrtzi

Tests/IndexStoreDBTests/IndexStoreDBTests.swift

@@ -15,6 +15,13 @@ import ISDBTibs
 import XCTest
 import Foundation
 
+let isTSanEnabled: Bool = {
+  if let value = ProcessInfo.processInfo.environment["INDEXSTOREDB_ENABLED_THREAD_SANITIZER"] {
+    return value == "1" || value == "YES"
+  }
+  return false
+}()
+
 func checkThrows(_ expected: IndexStoreDBError, file: StaticString = #file, line: UInt = #line, _ body: () throws -> ()) {
   do {
     try body()
@@ -73,6 +80,9 @@ final class IndexStoreDBTests: XCTestCase {
   }
 
   func testSymlinkedDBPaths() throws {
+    // FIXME: This test seems to trigger a false-positive in TSan.
+    try XCTSkipIf(isTSanEnabled, "skipping because TSan is enabled")
+
     let toolchain = TibsToolchain.testDefault
     let libIndexStore = try! IndexStoreLibrary(dylibPath: toolchain.libIndexStore.path)
 

Utilities/build-script-helper.py

@@ -62,6 +62,8 @@ def handle_invocation(swift_exec, args):
   if args.sanitize and 'undefined' in args.sanitize:
     supp = os.path.join(args.package_path, 'Utilities', 'ubsan_supressions.supp')
     env['UBSAN_OPTIONS'] = 'halt_on_error=true,suppressions=%s' % supp
+  if args.sanitize and 'thread' in args.sanitize:
+    env['INDEXSTOREDB_ENABLED_THREAD_SANITIZER'] = '1'
 
   # Workaround for incremental build bug in swiftpm.
   print('Cleaning ' + args.build_path)