Check for backtraces in tests which are verifying pretty stack traces from a crashing clang.

PrettyStackTrace now requires the ENABLE_BACKTRACES option.  We need to check for that here or these tests fail llvm-lit.

Reviewed by chandlerc

llvm-svn: 228735

clang/test/Analysis/crash-trace.c

@@ -2,7 +2,8 @@
 // REQUIRES: crash-recovery
 
 // FIXME: CHECKs might be incompatible to win32.
-// REQUIRES: shell
+// Stack traces also require back traces.
+// REQUIRES: shell backtrace
 
 void clang_analyzer_crash(void);
 

clang/test/Parser/crash-report.c

@@ -2,7 +2,8 @@
 // REQUIRES: crash-recovery
 
 // FIXME: CHECKs might be incompatible to win32.
-// REQUIRES: shell
+// Stack traces also require back traces.
+// REQUIRES: shell backtrace
 
 #prag\
 ma clang __debug crash

clang/test/lit.cfg

@@ -464,6 +464,9 @@ if config.llvm_use_sanitizer == "Undefined":
 else:
     config.available_features.add("not_ubsan")
 
+if config.enable_backtrace == "1":
+    config.available_features.add("backtrace")
+
 # Check if we should run long running tests.
 if lit_config.params.get("run_long_tests", None) == "true":
     config.available_features.add("long_tests")

clang/test/lit.site.cfg.in

@@ -18,6 +18,7 @@ config.clang_arcmt = @ENABLE_CLANG_ARCMT@
 config.clang_staticanalyzer = @ENABLE_CLANG_STATIC_ANALYZER@
 config.clang_examples = @ENABLE_CLANG_EXAMPLES@
 config.enable_shared = @ENABLE_SHARED@
+config.enable_backtrace = "@ENABLE_BACKTRACES@"
 config.host_arch = "@HOST_ARCH@"
 
 # Support substitution of the tools and libs dirs with user parameters. This is