[libc++] Move a few tests into more correct places (#147557)

libcxx/test/extensions/all/cstddef.compile.pass.cpp

@@ -11,6 +11,7 @@
 // appear to provide that behavior too.
 
 #include <cstddef>
+
 #include "test_macros.h"
 
 using PtrdiffT = ::ptrdiff_t;

libcxx/test/extensions/clang/lit.local.cfg

@@ -0,0 +1,4 @@
+
+# Only libc++ supports clang-specific extensions
+if "stdlib=libc++" not in config.available_features:
+    config.unsupported = True

libcxx/test/extensions/libcxx/libcpp_version.gen.py

@@ -6,7 +6,7 @@
 #
 # ===----------------------------------------------------------------------===##
 
-# Test that all headers define the _LIBCPP_VERSION macro.
+# Test that all public headers define the _LIBCPP_VERSION macro.
 
 # RUN: %{python} %s %{libcxx-dir}/utils
 

libcxx/test/extensions/libcxx/lit.local.cfg

@@ -0,0 +1,3 @@
+
+if "stdlib=libc++" not in config.available_features:
+    config.unsupported = True

libcxx/test/selftest/lit.local.cfg

@@ -1,5 +0,0 @@
-# The tests in this directory need to run Python
-import shlex
-import sys
-
-config.substitutions.append(("%{python}", shlex.quote(sys.executable)))

libcxx/test/std/double_include.gen.py

@@ -28,6 +28,9 @@ for header in public_headers:
 {lit_header_restrictions.get(header, '')}
 {lit_header_undeprecations.get(header, '')}
 
+// We're using compiler-specific flags in this test
+// REQUIRES: (gcc || clang)
+
 // RUN: %{{cxx}} -c %s -o %t.first.o %{{flags}} %{{compile_flags}}
 // RUN: %{{cxx}} -c %s -o %t.second.o -DWITH_MAIN %{{flags}} %{{compile_flags}}
 // RUN: %{{cxx}} -o %t.exe %t.first.o %t.second.o %{{flags}} %{{link_flags}}

libcxx/test/std/header_inclusions.gen.py

@@ -48,6 +48,9 @@ for header in public_headers:
 //--- {header}.compile.pass.cpp
 // UNSUPPORTED: FROZEN-CXX03-HEADERS-FIXME
 
+// TODO: This is currently a libc++-specific way of testing the includes, but is a requirement for all implementation
+// REQUIRES: stdlib=libc++
+
 {lit_header_restrictions.get(header, '')}
 {lit_header_undeprecations.get(header, '')}