Date: Wed, 08 Dec 2021 21:07:16 +0000 From: bugzilla-noreply@freebsd.org To: toolchain@FreeBSD.org Subject: [Bug 215193] libc++ and libcxxrt: convert to a private library Message-ID: <bug-215193-29464-FMJAicmCl8@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-215193-29464@https.bugs.freebsd.org/bugzilla/> References: <bug-215193-29464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215193 Mark Millard <marklmi26-fbsd@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marklmi26-fbsd@yahoo.com --- Comment #5 from Mark Millard <marklmi26-fbsd@yahoo.com> --- (In reply to David Chisnall from comment #2) For reference: https://releases.llvm.org/13.0.0/projects/libcxx/docs/DesignDocs/ABIVersion= ing.html reports . . . QUOTE Libc++ aims to preserve a stable ABI to avoid subtle bugs when code built u= nder the old ABI is linked with code built under the new ABI. At the same time, libc++ wants to make ABI-breaking improvements and bugfixes in scenarios wh= ere the user doesn=E2=80=99t mind ABI breaks. To support both cases, libc++ allows specifying an ABI version at build tim= e. The version is defined with CMake option LIBCXX_ABI_VERSION. Currently supported values are 1 (the stable default) and 2 (the unstable =E2=80=9Cne= xt=E2=80=9D version). At some point =E2=80=9CABI version 2=E2=80=9D will be frozen and = new ABI-breaking changes will start being applied to version 3; but this has not happened ye= t. To always use the most cutting-edge, most unstable ABI (which is currently 2 but at some point will become 3), set the CMake option LIBCXX_ABI_UNSTABLE. Internally, each ABI-changing feature is placed under its own C++ macro, _LIBCPP_ABI_XXX. These macros=E2=80=99 definitions are controlled by the C+= + macro _LIBCPP_ABI_VERSION, which is controlled by the LIBCXX_ABI_VERSION set at b= uild time. Libc++ does not intend users to interact with these C++ macros direct= ly. END QUOTE --=20 You are receiving this mail because: You are the assignee for the bug.=
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