[libcxx-commits] [libcxx] [libc++] Remove the inline namespace for std::filesystem in ABIv2 (PR #92971)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 created https://github.com/llvm/llvm-project/pull/92971

None

>From 17185fc668093cc3c88229f91715039f7b2b9565 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Wed, 22 May 2024 01:07:35 +0200
Subject: [PATCH] [libc++] Remove the inline namespace for std::filesystem in
 ABIv2

---
 libcxx/include/__config | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libcxx/include/__config b/libcxx/include/__config
index 104a244cc82cc..b2f0a50cf787a 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -166,6 +166,8 @@
 // requires code not to make these assumptions.
 #    define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_ARRAY
 #    define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW
+// Dont' add an inline namespace for `std::filesystem`
+#    define _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
 #  elif _LIBCPP_ABI_VERSION == 1
 #    if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF))
 // Enable compiling copies of now inline methods into the dylib to support
@@ -831,10 +833,16 @@ typedef __char32_t char32_t;
                                inline namespace _LIBCPP_ABI_NAMESPACE {
 #  define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS
 
+#ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
+#  define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem {
+#  define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD
+#else
 #  define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD                                               \
                                              inline namespace __fs { namespace filesystem {
 
 #  define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD
+#endif
+
 // clang-format on
 
 #  if __has_attribute(__enable_if__)