test: handle spaces in paths better on macOS tests

Ensure that we quote the path to the SDKROOT which may contain spaces.
Failure to so will break the path into multiple components (split on
spaces) and generate an invalid command.

Author: compnerd

test/lit.cfg

@@ -435,8 +435,8 @@ if kIsWindows:
                                                                            config.swift_test_options,
                                                                            config.swift_driver_test_options)) )
 else:
-    config.substitutions.append( ('%swift_driver', "env SDKROOT=%s %r %s %s %s" % (config.variant_sdk, config.swift, mcp_opt, config.swift_test_options, config.swift_driver_test_options)) )
-    config.substitutions.append( ('%swiftc_driver', "env SDKROOT=%s %r -toolchain-stdlib-rpath -Xlinker -rpath -Xlinker /usr/lib/swift %s %s %s" % (config.variant_sdk, config.swiftc, mcp_opt, config.swift_test_options, config.swift_driver_test_options)) )
+    config.substitutions.append( ('%swift_driver', "env SDKROOT=%s %r %s %s %s" % (shell_quote(config.variant_sdk), config.swift, mcp_opt, config.swift_test_options, config.swift_driver_test_options)) )
+    config.substitutions.append( ('%swiftc_driver', "env SDKROOT=%s %r -toolchain-stdlib-rpath -Xlinker -rpath -Xlinker /usr/lib/swift %s %s %s" % (shell_quote(config.variant_sdk), config.swiftc, mcp_opt, config.swift_test_options, config.swift_driver_test_options)) )
 config.substitutions.append( ('%sil-opt', "%r %s %s" % (config.sil_opt, mcp_opt, config.sil_test_options)) )
 config.substitutions.append( ('%sil-func-extractor', "%r %s" % (config.sil_func_extractor, mcp_opt)) )
 config.substitutions.append( ('%sil-llvm-gen', "%r %s" % (config.sil_llvm_gen, mcp_opt)) )