Force lit to execute the ASan and TSan tests on iOS devices

sequentially.

The current implementation of commands in
`test/sanitizer_common/ios_commands/` for iOS devices cannot be executed
in parallel which results in the ASan and TSan tests failing when
executed in parallel by lit which was the default behaviour.

We now force the ASan and TSan tests to be a new parallelism group named
`darwin-ios-device-sanitizer` which allows only one test to be run at a
time.  We also emit a warning informing the user that tests are being
run sequentially.

This only applies if the target is an iOS device.

Differential Revision: https://reviews.llvm.org/D42156

llvm-svn: 323026

compiler-rt/test/asan/lit.cfg

@@ -212,5 +212,8 @@ else:
 if config.host_os not in ['Linux', 'Darwin', 'FreeBSD', 'SunOS', 'Windows']:
   config.unsupported = True
 
-if config.host_os == 'Darwin' and config.target_arch in ["x86_64", "x86_64h"]:
-  config.parallelism_group = "darwin-64bit-sanitizer"
+if config.host_os == 'Darwin':
+  if config.target_arch in ["x86_64", "x86_64h"]:
+    config.parallelism_group = "darwin-64bit-sanitizer"
+  elif config.ios and not config.iossim:
+    config.parallelism_group = "darwin-ios-device-sanitizer"

compiler-rt/test/lit.common.cfg

@@ -291,6 +291,14 @@ if platform.system() == 'Windows':
 if platform.system() == 'Darwin':
   lit_config.parallelism_groups["darwin-64bit-sanitizer"] = 3
 
+# The current implementation of the tools in sanitizer_common/ios_comamnds
+# do not support parallel execution so force sequential execution of the
+# tests on iOS devices.
+if config.host_os == 'Darwin' and config.ios and not config.iossim:
+  lit_config.warning("iOS device test cases being run sequentially")
+  lit_config.parallelism_groups["darwin-ios-device-sanitizer"] = 1
+
+
 if config.host_os == 'Darwin':
   config.substitutions.append( ("%ld_flags_rpath_exe", '-Wl,-rpath,@executable_path/ %dynamiclib') )
   config.substitutions.append( ("%ld_flags_rpath_so", '-install_name @rpath/`basename %dynamiclib`') )

compiler-rt/test/tsan/lit.cfg

@@ -85,5 +85,8 @@ if config.host_os not in ['FreeBSD', 'Linux', 'Darwin', 'NetBSD']:
 if config.android:
   config.unsupported = True
 
-if config.host_os == 'Darwin' and config.target_arch in ["x86_64", "x86_64h"]:
-  config.parallelism_group = "darwin-64bit-sanitizer"
+if config.host_os == 'Darwin':
+  if config.target_arch in ["x86_64", "x86_64h"]:
+    config.parallelism_group = "darwin-64bit-sanitizer"
+  elif config.ios and not config.iossim:
+    config.parallelism_group = "darwin-ios-device-sanitizer"