[libc++] Drop the legacy debug mode symbols by default
Leave the escape hatch in place with a note, but don't include the
debug mode symbols by default since we don't support the debug mode
in the normal library anymore.
This is technically an ABI break for users who were depending on
those debug mode symbols in the dylib, however those users will
already be broken at compile-time because they must have been using
_LIBCPP_DEBUG=2, which is now an error.
Differential Revision: https://reviews.llvm.org/D127360
NOKEYCHECK=True
GitOrigin-RevId: f1c30135417f8eed9585e5a42ae14f6ba9811fbc
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index bf232ad..da76d39 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -189,6 +189,11 @@
as a return type instead of relying on the type of ``valarray``-expressions, which is
not guaranteed by the Standard anyway.
+- By default, the legacy debug mode symbols are not provided with the library anymore. If
+ you are a vendor and need to re-enable them, please use the ``LIBCXX_ENABLE_BACKWARDS_COMPATIBILITY_DEBUG_MODE_SYMBOLS``
+ CMake flag, and contact the libc++ developers as this will be removed in LLVM 16.
+ Furthermore, please note that ``LIBCXX_ENABLE_DEBUG_MODE_SUPPORT`` is not honored anymore.
+
Build System Changes
--------------------
@@ -221,10 +226,6 @@
``libcxxabi/test/configs`` or ``libunwind/test/configs``, please move to one of those
configurations or define your own.
-- The ``LIBCXX_ENABLE_DEBUG_MODE_SUPPORT`` CMake configuration is not supported anymore. If you
- were disabling support for the debug mode with that flag, please use ``LIBCXX_ENABLE_BACKWARDS_COMPATIBILITY_DEBUG_MODE_SYMBOLS=OFF``
- instead.
-
- MinGW DLL builds of libc++ no longer use dllimport in their headers, which
means that the same set of installed headers works for both DLL and static
linkage. This means that distributors finally can build both library