[compiler-rt] [test] Disable MPROTECT on two builtin tests

[mgorny]

Summary

Introduce a new %run_nomprotect substitution to run tests that do not
work with MPROTECT enabled. This uses paxctl via a wrapper on NetBSD,
and evaluates to plain %run on other systems.

[mgorny]

Switch to using %run_nomprotect instead of extra %paxctl. This should be more consistent and should avoid potential issues with : on Windows.

compiler-rt/test/builtins/Unit/clear_cache_test.c

 // REQUIRES: native-run
 // UNSUPPORTED: arm, aarch64
-// RUN: %clang_builtins %s %librt -o %t && %run %t
+// RUN: %clang_builtins %s %librt -o %t && %run_nomprotect %t
 // REQUIRES: librt_has_clear_cache
 //===-- clear_cache_test.c - Test clear_cache -----------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//

compiler-rt/test/builtins/Unit/enable_execute_stack_test.c

 // REQUIRES: native-run
-// RUN: %clang_builtins %s %librt -o %t && %run %t
+// RUN: %clang_builtins %s %librt -o %t && %run_nomprotect %t
 // REQUIRES: librt_has_enable_execute_stack
 //===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//

compiler-rt/test/lit.common.cfg.py

if config.have_zlib == "1":
   config.available_features.add("zlib")
 
 # Use ugly construction to explicitly prohibit "clang", "clang++" etc.
 # in RUN lines.
 config.substitutions.append(
     (' clang', """\n\n*** Do not use 'clangXXX' in tests,
      instead define '%clangXXX' substitution in lit config. ***\n\n""") )
 
+if config.host_os == 'NetBSD':
+  nb_commands_dir = os.path.join(config.compiler_rt_src_root,
+                                 "test", "sanitizer_common", "netbsd_commands")
+  config.netbsd_noaslr_prefix = ('sh ' +
+                                 os.path.join(nb_commands_dir, 'run_noaslr.sh'))
+  config.netbsd_nomprotect_prefix = ('sh ' +
+                                     os.path.join(nb_commands_dir,
+                                                  'run_nomprotect.sh'))
+  config.substitutions.append( ('%run_nomprotect',
+                                config.netbsd_nomprotect_prefix) )
+else:
+  config.substitutions.append( ('%run_nomprotect', '%run') )
+
 # Allow tests to be executed on a simulator or remotely.
 if config.emulator:
   config.substitutions.append( ('%run', config.emulator) )
   config.substitutions.append( ('%env ', "env ") )
   # TODO: Implement `%device_rm` to perform removal of files in the emulator.
   # For now just make it a no-op.
   lit_config.warning('%device_rm is not implemented')
   config.substitutions.append( ('%device_rm', 'echo ') )

 
 if config.use_lld and config.has_lld and not config.use_lto:
   extra_cflags += ["-fuse-ld=lld"]
 elif config.use_lld and (not config.has_lld):
   config.unsupported = True
 
 config.clang = " " + " ".join(run_wrapper + [config.compile_wrapper, config.clang]) + " "
 config.target_cflags = " " + " ".join(target_cflags + extra_cflags) + " "
-
-if config.host_os == 'NetBSD':
-  nb_commands_dir = os.path.join(config.compiler_rt_src_root,
-                                 "test", "sanitizer_common", "netbsd_commands")
-  config.netbsd_noaslr_prefix = ('sh ' +
-                                 os.path.join(nb_commands_dir, 'run_noaslr.sh'))

compiler-rt/test/sanitizer_common/netbsd_commands/run_nomprotect.sh

+#!/bin/sh
+/usr/sbin/paxctl +m "${1}"
+exec "${@}"