Do not run tests for crash recovery if libstdc++ safe mode is enabled

[sepavloff]

Summary

If expensive checks are enabled, safe mode of libstdc++ is enabled too.
In this mode the library uses more complex data that allow additional
checks, for instance, a container may keep list of iterators that points
to it. If a code crashes it can leave these complex library objects in
inconsistent state. It occurs in a few tests that check error recovery
if compiler crashes. These test hang in expensive check mode, as the
library tries to synchronize access to the iterators pointing to some
container, but corresponding mutex remains locked after the crash.

This fix marks these tests as unsupported if clang is built with
libstdc++ safe mode enabled.

[sepavloff]

Any feedback?

[sepavloff]

The problem solved by the fix is still actual.

[gkistanova]

LGTM

Thanks

Galina

test/Index/crash-recovery-code-complete.c

 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_PREAMBLE_FILE=%t-preamble.pch \
 // RUN:   not c-index-test -code-completion-at=%s:20:1 \
 // RUN:   "-remap-file=%s,%S/Inputs/crash-recovery-code-complete-remap.c" \
 // RUN:   %s 2> %t.err
 // RUN: FileCheck < %t.err -check-prefix=CHECK-CODE-COMPLETE-CRASH %s
 // RUN: test ! -e %t-preamble.pch
 // CHECK-CODE-COMPLETE-CRASH: Unable to perform code completion!
 //
 // REQUIRES: crash-recovery
 
 // FIXME: Please investigate abnormal path in MemoryBuffer.
 // REQUIRES: can-remove-opened-file
+// UNSUPPORTED: libstdcxx-safe-mode
 
 #warning parsing original file

test/Index/crash-recovery-modules.m

 // Clear out the module cache entirely, so we start from nothing.
 // RUN: rm -rf %t
 
 // Parse the file, such that building the module will cause Clang to crash.
 // RUN: not env CINDEXTEST_FAILONERROR=1 c-index-test -test-load-source all -fmodules -fmodules-cache-path=%t -Xclang -fdisable-module-hash -I %S/Inputs/Headers -DCRASH %s > /dev/null 2> %t.err
 // RUN: FileCheck < %t.err -check-prefix=CHECK-CRASH %s
-// CHECK-CRASH: crash-recovery-modules.m:16:9:{16:2-16:14}: fatal error: could not build module 'Crash'
+// CHECK-CRASH: crash-recovery-modules.m:17:9:{17:2-17:14}: fatal error: could not build module 'Crash'
 
 // Parse the file again, without crashing, to make sure that
 // subsequent parses do the right thing.
 // RUN: env CINDEXTEST_FAILONERROR=1 c-index-test -test-load-source all -fmodules -fmodules-cache-path=%t -Xclang -fdisable-module-hash -I %S/Inputs/Headers %s > /dev/null
 
 // REQUIRES: crash-recovery
 // REQUIRES: shell
+// UNSUPPORTED: libstdcxx-safe-mode
 
 @import Crash;
 
 #ifdef LIBCLANG_CRASH
 #pragma clang __debug crash
 #endif
 
 void test() {

test/Index/crash-recovery-reparse.c

 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_PREAMBLE_FILE=%t-preamble.pch \
 // RUN:   not c-index-test -test-load-source-reparse 1 local \
 // RUN:   -remap-file="%s,%S/Inputs/crash-recovery-reparse-remap.c" \
 // RUN:   %s 2> %t.err
 // RUN: FileCheck < %t.err -check-prefix=CHECK-REPARSE-SOURCE-CRASH %s
 // RUN: test ! -e $t-preamble.pch
 // CHECK-REPARSE-SOURCE-CRASH: Unable to reparse translation unit
 //
 // REQUIRES: crash-recovery
+// UNSUPPORTED: libstdcxx-safe-mode
 
 #warning parsing original file

test/Index/crash-recovery.c

 // RUN: not c-index-test -test-load-source all %s 2> %t.err
 // RUN: FileCheck < %t.err -check-prefix=CHECK-LOAD-SOURCE-CRASH %s
 // CHECK-LOAD-SOURCE-CRASH: Unable to load translation unit
 // RUN: env LIBCLANG_DISABLE_CRASH_RECOVERY=1 not --crash c-index-test -test-load-source all %s
 //
 // REQUIRES: crash-recovery
+// UNSUPPORTED: libstdcxx-safe-mode
 
 #pragma clang __debug crash

test/lit.cfg

 if not re.match(r'.*-(cygwin)$', config.target_triple):
     config.available_features.add('clang-driver')
 
 # [PR18856] Depends to remove opened file. On win32, a file could be removed
 # only if all handles were closed.
 if platform.system() not in ['Windows']:
     config.available_features.add('can-remove-opened-file')
 
-# Returns set of available features, registered-target(s) and asserts.
+# Returns set of available features, registered-target(s), asserts and
+# compile definitions.
 def get_llvm_config_props():
     set_of_features = set()
 
     cmd = subprocess.Popen(
         [
             os.path.join(llvm_tools_dir, 'llvm-config'),
             '--assertion-mode',
             '--targets-built',
+            '--cxxflags'
             ],
         stdout=subprocess.PIPE,
         env=config.environment
         )
     # 1st line corresponds to --assertion-mode, "ON" or "OFF".
     line = cmd.stdout.readline().strip().decode('ascii')
     if line == "ON":
         set_of_features.add('asserts')
 
     # 2nd line corresponds to --targets-built, like;
     # AArch64 ARM CppBackend X86
     for arch in cmd.stdout.readline().decode('ascii').split():
         set_of_features.add(arch.lower() + '-registered-target')
 
+    # 3rd line contains compile definitions, search it to define if
+    # libstdc++ safe mode is set.
+    if re.search(r'-D_GLIBCXX_DEBUG\b', cmd.stdout.readline().decode('ascii')):
+        set_of_features.add('libstdcxx-safe-mode')
+
     return set_of_features
 
 config.available_features.update(get_llvm_config_props())
 
 if lit.util.which('xmllint'):
     config.available_features.add('xmllint')
 
 # Sanitizers.