[libc++] Adds a new feature-test macro generator class.

libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py

@@ -0,0 +1,54 @@
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
+
+import sys
+
+sys.path.append(sys.argv[1])
+from generate_feature_test_macro_components import FeatureTestMacros
+
+
+def test(output, expected):
+    assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+
+
+ftm = FeatureTestMacros(sys.argv[2])
+test(
+    ftm.implemented_ftms,
+    {
+        "__cpp_lib_any": {
+            "c++17": "201606L",
+            "c++20": "201606L",
+            "c++23": "201606L",
+            "c++26": "201606L",
+        },
+        "__cpp_lib_barrier": {
+            "c++20": "201907L",
+            "c++23": "201907L",
+            "c++26": "201907L",
+        },
+        "__cpp_lib_format": {
+            "c++20": None,
+            "c++23": None,
+            "c++26": None,
+        },
+        "__cpp_lib_parallel_algorithm": {
+            "c++17": "201603L",
+            "c++20": "201603L",
+            "c++23": "201603L",
+            "c++26": "201603L",
+        },
+        "__cpp_lib_variant": {
+            "c++17": "202102L",
+            "c++20": "202102L",
+            "c++23": "202102L",
+            "c++26": "202102L",
+        },
+    },
+)

libcxx/test/libcxx/feature_test_macro/invalid.sh.py

@@ -0,0 +1,108 @@
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+# RUN: %{python} %s %{libcxx-dir}/utils %t
+
+import sys
+import json
+
+sys.path.append(sys.argv[1])
+from generate_feature_test_macro_components import FeatureTestMacros
+
+
+def test(output, expected):
+    assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+
+
+def test_error(data, type, message):
+    tmp = sys.argv[2]
+    with open(tmp, "w") as file:
+        file.write(json.dumps(data))
+    ftm = FeatureTestMacros(tmp)
+    try:
+        ftm.implemented_ftms
+    except type as error:
+        test(str(error), message)
+    else:
+        assert False, "no exception was thrown"
+
+
+test_error(
+    [
+        {
+            "values": {
+                "c++17": {
+                    "197001": [
+                        {
+                            "implemented": False,
+                        },
+                    ],
+                },
+            },
+            "headers": [],
+        },
+    ],
+    KeyError,
+    "'name'",
+)
+
+test_error(
+    [
+        {
+            "name": "a",
+            "headers": [],
+        },
+    ],
+    KeyError,
+    "'values'",
+)
+
+test_error(
+    [
+        {
+            "name": "a",
+            "values": {},
+            "headers": [],
+        },
+    ],
+    AssertionError,
+    "'values' is empty",
+)
+
+
+test_error(
+    [
+        {
+            "name": "a",
+            "values": {
+                "c++17": {},
+            },
+            "headers": [],
+        },
+    ],
+    AssertionError,
+    "a[c++17] has no entries",
+)
+
+test_error(
+    [
+        {
+            "name": "a",
+            "values": {
+                "c++17": {
+                    "197001": [
+                        {},
+                    ],
+                },
+            },
+            "headers": [],
+        },
+    ],
+    KeyError,
+    "'implemented'",
+)

libcxx/test/libcxx/feature_test_macro/standard_ftms.sh.py

@@ -0,0 +1,54 @@
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
+
+import sys
+
+sys.path.append(sys.argv[1])
+from generate_feature_test_macro_components import FeatureTestMacros
+
+
+def test(output, expected):
+    assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+
+
+ftm = FeatureTestMacros(sys.argv[2])
+test(
+    ftm.standard_ftms,
+    {
+        "__cpp_lib_any": {
+            "c++17": "201606L",
+            "c++20": "201606L",
+            "c++23": "201606L",
+            "c++26": "201606L",
+        },
+        "__cpp_lib_barrier": {
+            "c++20": "201907L",
+            "c++23": "201907L",
+            "c++26": "201907L",
+        },
+        "__cpp_lib_format": {
+            "c++20": "202110L",
+            "c++23": "202207L",
+            "c++26": "202311L",
+        },
+        "__cpp_lib_parallel_algorithm": {
+            "c++17": "201603L",
+            "c++20": "201603L",
+            "c++23": "201603L",
+            "c++26": "201603L",
+        },
+        "__cpp_lib_variant": {
+            "c++17": "202102L",
+            "c++20": "202106L",
+            "c++23": "202106L",
+            "c++26": "202306L",
+        },
+    },
+)

libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py

@@ -0,0 +1,30 @@
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
+
+import sys
+
+sys.path.append(sys.argv[1])
+from generate_feature_test_macro_components import FeatureTestMacros
+
+
+def test(output, expected):
+    assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+
+
+ftm = FeatureTestMacros(sys.argv[2])
+test(
+    ftm.std_dialects,
+    [
+        "c++17",
+        "c++20",
+        "c++23",
+        "c++26",
+    ],
+)