[lldb][swift] Check runtime dependencies of SwiftREPL tests in local lit config

These binaries only exists if the Swift runtime was built correctly.
We cannot check them at configuration time, because they might not exist yet.

Author: weliveindetail

lldb/test/Shell/SwiftREPL/lit.local.cfg

@@ -2,3 +2,14 @@ config.suffixes = ['.test']
 
 if 'lldb-repro' in config.available_features:
   config.unsupported = True
+
+def check_exists(path):
+  import os
+  if not os.path.isfile(path):
+    lit_config.warning(f"Runtime dependency not found: {path}")
+
+# Check runtime dependencies for SwiftREPL tests on Windows
+if sys.platform == "win32":
+  host_arch = config.host_triple.split("-")[0]
+  check_exists(f"{config.swift_libs_dir}/windows/{host_arch}/swiftrt.obj")
+  check_exists(f"{config.llvm_shlib_dir}/swiftCore.dll")

lldb/test/Shell/lit.site.cfg.py.in

@@ -17,6 +17,7 @@ config.cmake_sysroot = lit_config.substitute("@CMAKE_SYSROOT@")
 config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.python_executable = "@Python3_EXECUTABLE@"
 config.swiftc = "@LLDB_SWIFTC@"
+config.swift_libs_dir = '@LLDB_SWIFT_LIBS@'
 config.lldb_enable_swift = @LLDB_ENABLE_SWIFT_SUPPORT@
 config.have_zlib = @LLVM_ENABLE_ZLIB@
 config.objc_gnustep_dir = "@LLDB_TEST_OBJC_GNUSTEP_DIR@"