diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst --- a/libcxx/docs/ReleaseNotes.rst +++ b/libcxx/docs/ReleaseNotes.rst @@ -130,6 +130,11 @@ This ABI break only affects users that compile with ``-ffreestanding``, and only for ``atomic`` where ``T`` is a non-builtin type that could be lockfree on the platform. See https://llvm.org/D133377 for more details. +- When building libc++ against newlib/picolibc, the type of ``regex_type_traits::char_class_type`` was changed to + ``uint16_t`` since all values of ``ctype_base::mask`` are taken. This is technically an ABI break, but including + `` `` has triggered a ``static_assert`` failure since libc++ 14, so it is unlikely that this causes + problems for existing users. + Build System Changes -------------------- - Support for ``libcxx``, ``libcxxabi`` and ``libunwind`` in ``LLVM_ENABLE_PROJECTS`` has officially diff --git a/libcxx/include/__locale b/libcxx/include/__locale --- a/libcxx/include/__locale +++ b/libcxx/include/__locale @@ -512,7 +512,8 @@ static const mask punct = _P; static const mask xdigit = _X | _N; static const mask blank = _B; - static const mask __regex_word = 0x80; + // mask is already fully saturated, use a different type in regex_type_traits. + static const unsigned short __regex_word = 0x100; # define _LIBCPP_CTYPE_MASK_IS_COMPOSITE_PRINT # define _LIBCPP_CTYPE_MASK_IS_COMPOSITE_ALPHA # define _LIBCPP_CTYPE_MASK_IS_COMPOSITE_XDIGIT @@ -551,7 +552,8 @@ _LIBCPP_INLINE_VISIBILITY ctype_base() {} - static_assert((__regex_word & ~(space | print | cntrl | upper | lower | alpha | digit | punct | xdigit | blank)) == __regex_word, + static_assert((__regex_word & ~(std::make_unsigned::type)(space | print | cntrl | upper | lower | alpha | + digit | punct | xdigit | blank)) == __regex_word, "__regex_word can't overlap other bits"); }; diff --git a/libcxx/include/regex b/libcxx/include/regex --- a/libcxx/include/regex +++ b/libcxx/include/regex @@ -1026,7 +1026,7 @@ typedef _CharT char_type; typedef basic_string string_type; typedef locale locale_type; -#ifdef __BIONIC__ +#if defined(__BIONIC__) || defined(_NEWLIB_VERSION) // Originally bionic's ctype_base used its own ctype masks because the // builtin ctype implementation wasn't in libc++ yet. Bionic's ctype mask // was only 8 bits wide and already saturated, so it used a wider type here @@ -1035,6 +1035,11 @@ // implementation, but this was not updated to match. Since then Android has // needed to maintain a stable libc++ ABI, and this can't be changed without // an ABI break. + // We also need this workaround for newlib since _NEWLIB_VERSION is not + // defined yet inside __config, so we can't set the + // _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE macro. Additionally, newlib is + // often used for space constrained environments, so it makes sense not to + // duplicate the ctype table. typedef uint16_t char_class_type; #else typedef ctype_base::mask char_class_type;