[libcxx-commits] [libcxx] [llvm] [libc++] Unify the benchmarks with the test suite (PR #101399)

[Mark de Wever via libcxx-commits]

================
@@ -438,48 +442,20 @@ Libc++ contains benchmark tests separately from the test of the test suite.
 The benchmarks are written using the `Google Benchmark`_ library, a copy of which
 is stored in the libc++ repository.
 
-For more information about using the Google Benchmark library see the
+For more information about using the Google Benchmark library, see the
 `official documentation <https://github.com/google/benchmark>`_.
 
-.. _`Google Benchmark`: https://github.com/google/benchmark
-
-Building Benchmarks
--------------------
-
-The benchmark tests are not built by default. The benchmarks can be built using
-the ``cxx-benchmarks`` target.
-
-An example build would look like:
-
-.. code-block:: bash
-
-  $ ninja -C build cxx-benchmarks
-
-This will build all of the benchmarks under ``<libcxx>/test/benchmarks`` to be
-built against the just-built libc++. The compiled tests are output into
-``build/libcxx/test/benchmarks``.
+The benchmarks are located under ``libcxx/test/benchmarks``. Running a benchmark
+works in the same way as running a test. Both the benchmarks and the tests share
+the same configuration, so make sure to enable the relevant optimization level
+when running the benchmarks.
----------------
mordante wrote:

This feels really error prone to me and might run benchmarks at lower optimization levels than expected.

https://github.com/llvm/llvm-project/pull/101399