GCC modified for the FreeChainXenon project
7c1e7eed89
This adds support for the new __ieee128 long double format on powerpc64le targets. Most of the complexity comes from wanting a single libstdc++.so library that contains the symbols needed by code compiled with both -mabi=ibmlongdouble and -mabi=ieeelongdouble (and not forgetting -mlong-double-64 as well!) In a few places this just requires an extra overload, for example std::from_chars has to be overloaded for both forms of long double. That can be done in a single translation unit that defines overloads for 'long double' and also '__ieee128', so that user code including <charconv> will be able to link to a definition for either type of long double. Those are the easy cases. The difficult parts are (as for the std::string ABI transition) the I/O and locale facets. In order to be able to write either form of long double to an ostream such as std::cout we need the locale to contain a std::num_put facet that can handle both forms. The same approach is taken as was already done for supporting 64-bit long double and 128-bit long double: adding extra overloads of do_put to the facet class. On targets where the new long double code is enabled, the facets that are registered in the locale at program startup have additional overloads so that they can work with any long double type. Where this fails to work is if user code installs its own facet, which will probably not have the additional overloads and so will only be able to output one or the other type. In practice the number of users expecting to be able to use their own locale facets in code using a mix of -mabi=ibmlongdouble and -mabi=ieeelongdouble is probably close to zero. libstdc++-v3/ChangeLog: * Makefile.in: Regenerate. * config.h.in: Regenerate. * config/abi/pre/gnu.ver: Make patterns less greedy. * config/os/gnu-linux/ldbl-ieee128-extra.ver: New file with patterns for IEEE128 long double symbols. * configure: Regenerate. * configure.ac: Enable alternative 128-bit long double format on powerpc64*-*-linux*. * doc/Makefile.in: Regenerate. * fragment.am: Regenerate. * include/Makefile.am: Set _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT. * include/Makefile.in: Regenerate. * include/bits/c++config: Define inline namespace for new long double symbols. Don't define _GLIBCXX_USE_FLOAT128 when it's the same type as long double. * include/bits/locale_classes.h [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT] (locale::_Impl::_M_init_extra_ldbl128): Declare new member function. * include/bits/locale_facets.h (_GLIBCXX_NUM_FACETS): Simplify by only counting narrow character facets. (_GLIBCXX_NUM_CXX11_FACETS): Likewise. (_GLIBCXX_NUM_LBDL_ALT128_FACETS): New. [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT] (num_get::__do_get): Define vtable placeholder for __ibm128 long double type. [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (num_get::__do_get): Declare vtable placeholder for __ibm128 long double type. [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (num_put::__do_put): Likewise. * include/bits/locale_facets.tcc [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (num_get::__do_get, num_put::__do_put): Define. * include/bits/locale_facets_nonio.h [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (money_get::__do_get): Declare vtable placeholder for __ibm128 long double type. [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (money_put::__do_put): Likewise. * include/bits/locale_facets_nonio.tcc [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__] (money_get::__do_get, money_put::__do_put): Define. * include/ext/numeric_traits.h [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT] (__numeric_traits<__ibm128>, __numeric_traits<__ieee128>): Define. * libsupc++/Makefile.in: Regenerate. * po/Makefile.in: Regenerate. * python/Makefile.in: Regenerate. * src/Makefile.am: Add compatibility-ldbl-alt128.cc and compatibility-ldbl-alt128-cxx11.cc sources and recipes for objects. * src/Makefile.in: Regenerate. * src/c++11/Makefile.in: Regenerate. * src/c++11/compatibility-ldbl-alt128-cxx11.cc: New file defining symbols using the old 128-bit long double format, for the cxx11 ABI. * src/c++11/compatibility-ldbl-alt128.cc: Likewise, for the gcc4-compatible ABI. * src/c++11/compatibility-ldbl-facets-aliases.h: New header for long double compat aliases. * src/c++11/cow-locale_init.cc: Add comment. * src/c++11/cxx11-locale-inst.cc: Define C and C_is_char unconditionally. * src/c++11/cxx11-wlocale-inst.cc: Add sanity check. Include locale-inst.cc directly, not via cxx11-locale-inst.cc. * src/c++11/locale-inst-monetary.h: New header for monetary category instantiations. * src/c++11/locale-inst-numeric.h: New header for numeric category instantiations. * src/c++11/locale-inst.cc: Include new headers for monetary, numeric, and long double definitions. * src/c++11/wlocale-inst.cc: Remove long double compat aliases that are defined in new header now. * src/c++17/Makefile.am: Use -mabi=ibmlongdouble for floating_from_chars.cc. * src/c++17/Makefile.in: Regenerate. * src/c++17/floating_from_chars.cc (from_chars_impl): Add if-constexpr branch for __ieee128. (from_chars): Overload for __ieee128. * src/c++20/Makefile.in: Regenerate. * src/c++98/Makefile.in: Regenerate. * src/c++98/locale_init.cc (num_facets): Adjust calculation. (locale::_Impl::_Impl(size_t)): Call _M_init_extra_ldbl128. * src/c++98/localename.cc (num_facets): Adjust calculation. (locale::_Impl::_Impl(const char*, size_t)): Call _M_init_extra_ldbl128. * src/filesystem/Makefile.in: Regenerate. * testsuite/Makefile.in: Regenerate. * testsuite/util/testsuite_abi.cc: Add new symbol versions. Allow new symbols to be added to GLIBCXX_IEEE128_3.4.29 and CXXABI_IEEE128_1.3.13 too. * testsuite/26_numerics/complex/abi_tag.cc: Add u9__ieee128 to regex matching expected symbols. |
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