Add a %darwin_min_target_with_tls_support lit substitution.

Summary:
This substitution expands to the appropriate minimum deployment target
flag where thread local storage (TLS) was first introduced on Darwin
platforms. For all other platforms the substitution expands to an empty
string.

E.g. for macOS the substitution expands to `-mmacosx-version-min=10.12`

This patch adds support for the substitution (and future substitutions)
by doing a minor refactor and then uses the substitution in the relevant
TSan tests.

rdar://problem/59568956

Reviewers: yln, kubamracek, dvyukov, vitalybuka

Subscribers: #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D74802

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

@@ -257,6 +257,15 @@ if config.gwp_asan:
 
 lit.util.usePlatformSdkOnDarwin(config, lit_config)
 
+# Maps a lit substitution name for the minimum target OS flag
+# to the macOS version that first contained the relevant feature.
+darwin_min_deployment_target_substitutions = {
+  '%macos_min_target_10_11': '10.11',
+  # rdar://problem/22207160
+  '%darwin_min_target_with_full_runtime_arc_support': '10.11',
+  '%darwin_min_target_with_tls_support': '10.12',
+}
+
 if config.host_os == 'Darwin':
   def get_apple_platform_version_aligned_with(macos_version, apple_platform):
     """
@@ -326,25 +335,29 @@ if config.host_os == 'Darwin':
   except:
     pass
 
-  min_os_aligned_with_osx_10_11 = get_apple_platform_version_aligned_with('10.11', config.apple_platform)
-  min_os_aligned_with_osx_10_11_flag = ''
-  if min_os_aligned_with_osx_10_11:
-    min_os_aligned_with_osx_10_11_flag = '{flag}={version}'.format(
-      flag=config.apple_platform_min_deployment_target_flag,
-      version=min_os_aligned_with_osx_10_11)
-  else:
-    lit_config.warning('Could not find a version of {} that corresponds with macOS 10.11'.format(config.apple_platform))
-  config.substitutions.append( ("%macos_min_target_10_11", min_os_aligned_with_osx_10_11_flag) )
-  # rdar://problem/22207160
-  config.substitutions.append( ("%darwin_min_target_with_full_runtime_arc_support", min_os_aligned_with_osx_10_11_flag) )
+  def get_apple_min_deploy_target_flag_aligned_with_osx(version):
+    min_os_aligned_with_osx_v = get_apple_platform_version_aligned_with(version, config.apple_platform)
+    min_os_aligned_with_osx_v_flag = ''
+    if min_os_aligned_with_osx_v:
+      min_os_aligned_with_osx_v_flag = '{flag}={version}'.format(
+        flag=config.apple_platform_min_deployment_target_flag,
+        version=min_os_aligned_with_osx_v)
+    else:
+      lit_config.warning('Could not find a version of {} that corresponds with macOS {}'.format(
+        config.apple_platform,
+        version))
+    return min_os_aligned_with_osx_v_flag
+
+  for substitution, osx_version in darwin_min_deployment_target_substitutions.items():
+    config.substitutions.append( (substitution, get_apple_min_deploy_target_flag_aligned_with_osx(osx_version)) )
 
   # 32-bit iOS simulator is deprecated and removed in latest Xcode.
   if config.apple_platform == "iossim":
     if config.target_arch == "i386":
       config.unsupported = True
 else:
-  config.substitutions.append( ("%macos_min_target_10_11", "") )
-  config.substitutions.append( ("%darwin_min_target_with_full_runtime_arc_support", "") )
+  for substitution in darwin_min_deployment_target_substitutions.keys():
+    config.substitutions.append( (substitution, "") )
 
 if config.android:
   env = os.environ.copy()

compiler-rt/test/tsan/dtls.c

@@ -1,5 +1,6 @@
-// RUN: %clang_tsan %s -o %t
-// RUN: %clang_tsan %s -DBUILD_SO -fPIC -o %t-so.so -shared
+// RUN: %clang_tsan %darwin_min_target_with_tls_support %s -o %t
+// RUN: %clang_tsan %darwin_min_target_with_tls_support %s -DBUILD_SO -fPIC -o \
+// RUN:   %t-so.so -shared
 // RUN: %run %t 2>&1 | FileCheck %s
 // XFAIL: netbsd
 

compiler-rt/test/tsan/mutexset7.cpp

@@ -1,4 +1,5 @@
-// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+// RUN: %clangxx_tsan %darwin_min_target_with_tls_support -O1 %s -o %t && \
+// RUN:   %deflake %run %t | FileCheck %s
 #include "test.h"
 
 int Global;

compiler-rt/test/tsan/tls_race.cpp

@@ -1,4 +1,6 @@
-// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s --check-prefix=CHECK-%os --check-prefix=CHECK
+// RUN: %clangxx_tsan %darwin_min_target_with_tls_support -O1 %s -o %t && \
+// RUN:   %deflake %run %t | \
+// RUN:   FileCheck %s --check-prefix=CHECK-%os --check-prefix=CHECK
 #include "test.h"
 
 void *Thread(void *a) {

compiler-rt/test/tsan/tls_race2.cpp

@@ -1,4 +1,6 @@
-// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s --check-prefix=CHECK-%os --check-prefix=CHECK
+// RUN: %clangxx_tsan %darwin_min_target_with_tls_support -O1 %s -o %t && \
+// RUN:   %deflake %run %t | \
+// RUN:   FileCheck %s --check-prefix=CHECK-%os --check-prefix=CHECK
 #include "test.h"
 
 void *Thread2(void *a) {