[libc++] Add a new target check-cxx-deps to build dependencies of the test suite
When running the tests through `lit` directly instead of through `check-cxx`,
it is required to manually build the `cxx` (and often `cxx_experimental`)
targets. Instead of having to do that manually, this commit adds a new
target `check-cxx-deps` that does that for you.
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 3fbc9c7b51e427a549109f092d3a822b70e1e679
diff --git a/docs/TestingLibcxx.rst b/docs/TestingLibcxx.rst
index 683d5e0..b70cf2e 100644
--- a/docs/TestingLibcxx.rst
+++ b/docs/TestingLibcxx.rst
@@ -25,11 +25,14 @@
-----
After building libc++, you can run parts of the libc++ test suite by simply
-running ``llvm-lit`` on a specified test or directory. For example:
+running ``llvm-lit`` on a specified test or directory. If you're unsure
+whether the required libraries have been built, you can use the
+`check-cxx-deps` target. For example:
.. code-block:: bash
$ cd <monorepo-root>
+ $ make -C <build> check-cxx-deps # If you want to make sure the targets get rebuilt
$ <build>/bin/llvm-lit -sv libcxx/test/std/re # Run all of the std::regex tests
$ <build>/bin/llvm-lit -sv libcxx/test/std/depr/depr.c.headers/stdlib_h.pass.cpp # Run a single test
$ <build>/bin/llvm-lit -sv libcxx/test/std/atomics libcxx/test/std/threads # Test std::thread and std::atomic