[llvm][Support] Only enable backtrace test when it's enabled

rdar://138554797

Author: jroelofs

llvm/test/CMakeLists.txt

@@ -1,6 +1,7 @@
 llvm_canonicalize_cmake_booleans(
   BUILD_SHARED_LIBS
   HAVE_OCAMLOPT
+  ENABLE_BACKTRACES
   LLVM_ENABLE_DIA_SDK
   LLVM_ENABLE_FFI
   LLVM_ENABLE_THREADS

llvm/test/Other/crash-stack-trace.ll

@@ -1,4 +1,4 @@
-; REQUIRES: asserts
+; REQUIRES: asserts, backtrace
 
 ; RUN: not --crash opt -passes=trigger-crash-module %s -disable-output 2>&1 | \
 ; RUN: FileCheck %s --check-prefix=CHECK-MODULE

llvm/test/lit.cfg.py

@@ -597,6 +597,9 @@ def have_ld64_plugin_support():
 ) and not re.match(r"^arm64(e)?-apple-(macos|darwin)", config.target_triple):
     config.available_features.add("debug_frame")
 
+if config.enable_backtrace:
+    config.available_features.add("backtrace")
+
 if config.enable_threads:
     config.available_features.add("thread_support")
 

llvm/test/lit.site.cfg.py.in

@@ -41,6 +41,7 @@ config.have_httplib = @LLVM_ENABLE_HTTPLIB@
 config.have_dia_sdk = @LLVM_ENABLE_DIA_SDK@
 config.enable_ffi = @LLVM_ENABLE_FFI@
 config.build_examples = @LLVM_BUILD_EXAMPLES@
+config.enable_backtrace = @ENABLE_BACKTRACES@
 config.enable_threads = @LLVM_ENABLE_THREADS@
 config.build_shared_libs = @BUILD_SHARED_LIBS@
 config.link_llvm_dylib = @LLVM_LINK_LLVM_DYLIB@