[libcxx-commits] [libcxx] [RFC][libc++][test] Improves C++ Standard filtering. (PR #89499)
Mark de Wever via libcxx-commits
libcxx-commits at lists.llvm.org
Mon Dec 2 09:36:13 PST 2024
https://github.com/mordante updated https://github.com/llvm/llvm-project/pull/89499
>From cd9debce5652a5010868de9398b416cd4466a1ff Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Fri, 19 Apr 2024 20:31:19 +0200
Subject: [PATCH] [RFC][libc++][test] Improves C++ Standard filtering.
This is a proof-of-concept how we could improve the C++ language filtering
in lit. There will be a Discourse post for adding feedback on the
approach.
---
libcxx/docs/TestingLibcxx.rst | 32 +++++++++++++++++++
.../print.fun/includes.compile.pass.cpp | 2 +-
.../print.fun/no_file_description.pass.cpp | 2 +-
.../locale.stdcvt/depr.verify.cpp | 2 +-
.../conversions.buffer/depr.verify.cpp | 2 +-
.../conversions.string/depr.verify.cpp | 2 +-
.../reserve.deprecated_in_cxx20.verify.cpp | 2 +-
libcxx/utils/libcxx/test/params.py | 3 +-
8 files changed, 40 insertions(+), 7 deletions(-)
diff --git a/libcxx/docs/TestingLibcxx.rst b/libcxx/docs/TestingLibcxx.rst
index 6d2c954489f62e..432d39080049a3 100644
--- a/libcxx/docs/TestingLibcxx.rst
+++ b/libcxx/docs/TestingLibcxx.rst
@@ -435,6 +435,38 @@ writing tests easier. See `libc++-specific Lit Directives`_ for more information
extension.)
+C++ Standard version tests
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Historically libc++ tests used to filter the tests for C++ Standard versions
+with lit directives like:
+
+.. code-block:: cpp
+
+ // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+With C++ Standards released every 3 years, this solution is not scalable.
+Instead use:
+
+.. code-block:: cpp
+
+ // UNSUPPORTED: std-at-least-c++26
+
+There is no corresponding ``std-at-most-c++23``. This could be useful when
+tests are only valid for a small set of standard versions. For example, a
+deprecation test is only valid when the feature is deprecated until it is
+removed from the Standard. These tests should be written like:
+
+.. code-block:: cpp
+
+ // REQUIRES: c++17 || c++20 || c++23
+
+.. note::
+
+ There are a lot of tests with the first style, these can remain as they are.
+ The new style is only intended to be used for new tests.
+
+
Benchmarks
==========
diff --git a/libcxx/test/std/input.output/iostream.format/print.fun/includes.compile.pass.cpp b/libcxx/test/std/input.output/iostream.format/print.fun/includes.compile.pass.cpp
index 9b9b0e404e6b7b..38e4e4d3fb9ef5 100644
--- a/libcxx/test/std/input.output/iostream.format/print.fun/includes.compile.pass.cpp
+++ b/libcxx/test/std/input.output/iostream.format/print.fun/includes.compile.pass.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// REQUIRES: std-at-least-c++23
// UNSUPPORTED: no-filesystem
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
diff --git a/libcxx/test/std/input.output/iostream.format/print.fun/no_file_description.pass.cpp b/libcxx/test/std/input.output/iostream.format/print.fun/no_file_description.pass.cpp
index d3e4463fe0bc89..5561a1a8b33347 100644
--- a/libcxx/test/std/input.output/iostream.format/print.fun/no_file_description.pass.cpp
+++ b/libcxx/test/std/input.output/iostream.format/print.fun/no_file_description.pass.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// REQUIRES: std-at-least-c++23
// UNSUPPORTED: no-filesystem
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
diff --git a/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
index b3c6fc8674f8a2..7bdcaa5190bd04 100644
--- a/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14, c++26
+// REQUIRES: c++17 || c++20 || c++23
// UNSUPPORTED: no-wide-characters
// <codecvt>
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
index cb067e99a4764b..dcab5cef3a550a 100644
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14, c++26
+// REQUIRES: c++17 || c++20 || c++23
// XFAIL: no-wide-characters
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
index f8bd156bdd5f6a..6eab4a5dd9223c 100644
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
@@ -8,7 +8,7 @@
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX26_REMOVED_WSTRING_CONVERT
-// UNSUPPORTED: c++03, c++11, c++14, c++26
+// REQUIRES: c++17 || c++20 || c++23
// UNSUPPORTED: no-wide-characters
// <codecvt>
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp b/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
index 81edd9b83d184d..87b56c06b95125 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/reserve.deprecated_in_cxx20.verify.cpp
@@ -10,7 +10,7 @@
// void reserve(); // Deprecated in C++20
-// UNSUPPORTED: c++03, c++11, c++14, c++17, c++26
+// REQUIRES: c++20 || c++23
#include <string>
diff --git a/libcxx/utils/libcxx/test/params.py b/libcxx/utils/libcxx/test/params.py
index 2c5cb169c0a9a3..626ddd16ebc3ad 100644
--- a/libcxx/utils/libcxx/test/params.py
+++ b/libcxx/utils/libcxx/test/params.py
@@ -186,7 +186,8 @@ def getSuitableClangTidy(cfg):
AddFeature(std),
AddSubstitution("%{cxx_std}", re.sub(r"\+", "x", std)),
AddCompileFlag(lambda cfg: getStdFlag(cfg, std)),
- ],
+ ]
+ + [AddFeature(f"std-at-least-{s}") for s in _allStandards if s <= std],
),
Parameter(
name="optimization",
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