[libunwind] Tidy-up the testing configuration for libunwind

Start testing Apple backdeployment with older libunwinds, and stop
explicitly specifying the libunwind testing config, since it is
already selected correctly by default.

Differential Revision: https://reviews.llvm.org/D126470

3 files changed, 68 insertions, 4 deletions

diff --git a/libunwind/test/configs/apple-libunwind-backdeployment.cfg.in b/libunwind/test/configs/apple-libunwind-backdeployment.cfg.in
new file mode 100644
index 000000000000..d4777e2f6917
--- /dev/null
+++ b/libunwind/test/configs/apple-libunwind-backdeployment.cfg.in
@@ -0,0 +1,64 @@
+# Testing configuration for back-deployment against older Apple system libunwind.
+#
+# Under this configuration, we compile and link all the test suite against the latest libunwind,
+# however we run against the libunwind on a different platform. This emulates the workflow of
+# a developer building their application using recent tools but with the goal of deploying
+# on existing devices running an older OS (and hence an older dylib).
+
+import os, site
+site.addsitedir(os.path.join('@LIBUNWIND_LIBCXX_PATH@', 'utils'))
+import libcxx.test.params, libcxx.test.newconfig, libcxx.test.dsl
+
+lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
+
+BACKDEPLOYMENT_PARAMETERS = [
+    libcxx.test.dsl.Parameter(name='cxx_runtime_root', type=str,
+        actions=lambda root: [libcxx.test.dsl.AddSubstitution('%{cxx-runtime-root}', root)],
+        help="""
+        The simulated root of the system (for libc++) when running tests.
+
+        This should be a directory hierarchy under which the libc++ dylib can be found.
+        The dylib in that hierarchy is the one that will be used at runtime when running
+        the tests.
+        """),
+    libcxx.test.dsl.Parameter(name='abi_runtime_root', type=str,
+        actions=lambda root: [libcxx.test.dsl.AddSubstitution('%{abi-runtime-root}', root)],
+        help="""
+        The simulated root of the system (for libc++abi) when running tests.
+
+        This should be a directory hierarchy under which the libc++abi dylib can be found.
+        The dylib in that hierarchy is the one that will be used at runtime when running
+        the tests.
+        """),
+    libcxx.test.dsl.Parameter(name='unwind_runtime_root', type=str,
+        actions=lambda root: [libcxx.test.dsl.AddSubstitution('%{unwind-runtime-root}', root)],
+        help="""
+        The simulated root of the system (for libunwind) when running tests.
+
+        This should be a directory hierarchy under which the libunwind dylib can be found.
+        The dylib in that hierarchy is the one that will be used at runtime when running
+        the tests.
+        """),
+]
+
+config.substitutions.append(('%{flags}',
+    '-isysroot {}'.format('@CMAKE_OSX_SYSROOT@') if '@CMAKE_OSX_SYSROOT@' else ''
+))
+config.substitutions.append(('%{compile_flags}',
+    '-nostdinc++ -I %{include}'
+))
+config.substitutions.append(('%{link_flags}',
+    '-nostdlib++ -L %{lib} -lc++ -lc++abi -lunwind'
+))
+config.substitutions.append(('%{exec}',
+    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}:%{unwind-runtime-root}" -- '
+))
+
+import os, site
+import libcxx.test.params, libcxx.test.newconfig, libcxx.test.newconfig
+libcxx.test.newconfig.configure(
+    libcxx.test.params.DEFAULT_PARAMETERS + BACKDEPLOYMENT_PARAMETERS,
+    libcxx.test.features.DEFAULT_FEATURES,
+    config,
+    lit_config
+)
diff --git a/libunwind/test/libunwind_01.pass.cpp b/libunwind/test/libunwind_01.pass.cpp
index 8b4825ac30dc..bbfaffd153cc 100644
--- a/libunwind/test/libunwind_01.pass.cpp
+++ b/libunwind/test/libunwind_01.pass.cpp
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-// TODO: Investigate these failures on x86_64 macOS back deployment
-// UNSUPPORTED: target=x86_64-apple-darwin{{.+}}
+// TODO: Investigate this failure on x86_64 macOS back deployment
+// XFAIL: use_system_cxx_lib && target=x86_64-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan
diff --git a/libunwind/test/signal_frame.pass.cpp b/libunwind/test/signal_frame.pass.cpp
index d9fb439cd1e7..b17804efa08c 100644
--- a/libunwind/test/signal_frame.pass.cpp
+++ b/libunwind/test/signal_frame.pass.cpp
@@ -9,8 +9,8 @@
 
 // Ensure that functions marked as signal frames are reported as such.
 
-// TODO: Investigate this failure on macOS
-// XFAIL: target={{.+}}-apple-darwin{{.+}}
+// TODO: Investigate this failure on Apple
+// XFAIL: target={{.+}}-apple-{{.+}}
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan