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2025-04-28libstdc++: Fix mingw build by using _M_span [PR119970]Tomasz Kamiński1-1/+1
The r16-142-g01e5ef3e8b9128 chagned return type of _Str_sink::view() to basic_string_view<_CharT>. The mutable access is provided by _M_span function, that is now used for mingw path. PR libstdc++/119970 libstdc++-v3/ChangeLog: * include/std/ostream (vprint_unicode) [_WIN32 && !__CYGWIN__]: Call _Str_sink::_M_span instead of view. * include/std/print (vprint_unicode) [_WIN32 && !__CYGWIN__]: Call _Str_sink::_M_span instead of view.
2024-09-25libstdc++: #ifdef out #pragma GCC system_headerJason Merrill1-0/+2
In r15-3714-gd3a7302ec5985a I added -Wsystem-headers to the libstdc++ build flags to help catch problems in the library. This patch takes a different approach, of disabling the #pragma system_header unless _GLIBCXX_SYSHDR is defined. As a result, the testsuites will treat them as non-system-headers to get better warning coverage during regression testing of both gcc and libstdc++, not just when building the library. My rationale for the #ifdef instead of just removing the #pragma is the three G++ tests that want to test libstdc++ system header behavior, so we need a way to select it. This doesn't affect installed libraries, as they get their system-header status from the lookup path. But testsuite_flags --build-includes gives -I directives rather than -isystem. This patch doesn't change the headers in config/ because I'm not compiling with most of them, so won't see any warnings that need fixing. Adjusting them could happen later, or we can not bother. libstdc++-v3/ChangeLog: * acinclude.m4 (WARN_FLAGS): Remove -Wsystem-headers. * configure: Regenerate. * include/bits/algorithmfwd.h: #ifdef out #pragma GCC system_header. * include/bits/atomic_base.h * include/bits/atomic_futex.h * include/bits/atomic_timed_wait.h * include/bits/atomic_wait.h * include/bits/basic_ios.h * include/bits/basic_string.h * include/bits/boost_concept_check.h * include/bits/char_traits.h * include/bits/charconv.h * include/bits/chrono.h * include/bits/chrono_io.h * include/bits/codecvt.h * include/bits/concept_check.h * include/bits/cpp_type_traits.h * include/bits/elements_of.h * include/bits/enable_special_members.h * include/bits/erase_if.h * include/bits/forward_list.h * include/bits/functional_hash.h * include/bits/gslice.h * include/bits/gslice_array.h * include/bits/hashtable.h * include/bits/indirect_array.h * include/bits/invoke.h * include/bits/ios_base.h * include/bits/iterator_concepts.h * include/bits/locale_classes.h * include/bits/locale_facets.h * include/bits/locale_facets_nonio.h * include/bits/localefwd.h * include/bits/mask_array.h * include/bits/max_size_type.h * include/bits/memory_resource.h * include/bits/memoryfwd.h * include/bits/move_only_function.h * include/bits/node_handle.h * include/bits/ostream_insert.h * include/bits/out_ptr.h * include/bits/parse_numbers.h * include/bits/postypes.h * include/bits/quoted_string.h * include/bits/range_access.h * include/bits/ranges_base.h * include/bits/refwrap.h * include/bits/sat_arith.h * include/bits/semaphore_base.h * include/bits/slice_array.h * include/bits/std_abs.h * include/bits/std_function.h * include/bits/std_mutex.h * include/bits/std_thread.h * include/bits/stl_iterator_base_funcs.h * include/bits/stl_iterator_base_types.h * include/bits/stl_tree.h * include/bits/stream_iterator.h * include/bits/streambuf_iterator.h * include/bits/stringfwd.h * include/bits/this_thread_sleep.h * include/bits/unique_lock.h * include/bits/uses_allocator_args.h * include/bits/utility.h * include/bits/valarray_after.h * include/bits/valarray_array.h * include/bits/valarray_before.h * include/bits/version.h * include/c_compatibility/fenv.h * include/c_compatibility/inttypes.h * include/c_compatibility/stdint.h * include/decimal/decimal.h * include/experimental/bits/net.h * include/experimental/bits/shared_ptr.h * include/ext/aligned_buffer.h * include/ext/alloc_traits.h * include/ext/atomicity.h * include/ext/concurrence.h * include/ext/numeric_traits.h * include/ext/pod_char_traits.h * include/ext/pointer.h * include/ext/stdio_filebuf.h * include/ext/stdio_sync_filebuf.h * include/ext/string_conversions.h * include/ext/type_traits.h * include/ext/vstring.h * include/ext/vstring_fwd.h * include/ext/vstring_util.h * include/parallel/algorithmfwd.h * include/parallel/numericfwd.h * include/tr1/functional_hash.h * include/tr1/hashtable.h * include/tr1/random.h * libsupc++/exception.h * libsupc++/hash_bytes.h * include/bits/basic_ios.tcc * include/bits/basic_string.tcc * include/bits/fstream.tcc * include/bits/istream.tcc * include/bits/locale_classes.tcc * include/bits/locale_facets.tcc * include/bits/locale_facets_nonio.tcc * include/bits/ostream.tcc * include/bits/sstream.tcc * include/bits/streambuf.tcc * include/bits/string_view.tcc * include/bits/version.tpl * include/experimental/bits/string_view.tcc * include/ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp * include/ext/random.tcc * include/ext/vstring.tcc * include/tr2/bool_set.tcc * include/tr2/dynamic_bitset.tcc * include/bits/c++config * include/c/cassert * include/c/cctype * include/c/cerrno * include/c/cfloat * include/c/ciso646 * include/c/climits * include/c/clocale * include/c/cmath * include/c/csetjmp * include/c/csignal * include/c/cstdarg * include/c/cstddef * include/c/cstdio * include/c/cstdlib * include/c/cstring * include/c/ctime * include/c/cuchar * include/c/cwchar * include/c/cwctype * include/c_global/cassert * include/c_global/ccomplex * include/c_global/cctype * include/c_global/cerrno * include/c_global/cfenv * include/c_global/cfloat * include/c_global/cinttypes * include/c_global/ciso646 * include/c_global/climits * include/c_global/clocale * include/c_global/cmath * include/c_global/csetjmp * include/c_global/csignal * include/c_global/cstdalign * include/c_global/cstdarg * include/c_global/cstdbool * include/c_global/cstddef * include/c_global/cstdint * include/c_global/cstdio * include/c_global/cstdlib * include/c_global/cstring * include/c_global/ctgmath * include/c_global/ctime * include/c_global/cuchar * include/c_global/cwchar * include/c_global/cwctype * include/c_std/cassert * include/c_std/cctype * include/c_std/cerrno * include/c_std/cfloat * include/c_std/ciso646 * include/c_std/climits * include/c_std/clocale * include/c_std/cmath * include/c_std/csetjmp * include/c_std/csignal * include/c_std/cstdarg * include/c_std/cstddef * include/c_std/cstdio * include/c_std/cstdlib * include/c_std/cstring * include/c_std/ctime * include/c_std/cuchar * include/c_std/cwchar * include/c_std/cwctype * include/debug/array * include/debug/bitset * include/debug/deque * include/debug/forward_list * include/debug/list * include/debug/map * include/debug/set * include/debug/string * include/debug/unordered_map * include/debug/unordered_set * include/debug/vector * include/decimal/decimal * include/experimental/algorithm * include/experimental/any * include/experimental/array * include/experimental/buffer * include/experimental/chrono * include/experimental/contract * include/experimental/deque * include/experimental/executor * include/experimental/filesystem * include/experimental/forward_list * include/experimental/functional * include/experimental/internet * include/experimental/io_context * include/experimental/iterator * include/experimental/list * include/experimental/map * include/experimental/memory * include/experimental/memory_resource * include/experimental/net * include/experimental/netfwd * include/experimental/numeric * include/experimental/propagate_const * include/experimental/ratio * include/experimental/regex * include/experimental/scope * include/experimental/set * include/experimental/socket * include/experimental/string * include/experimental/string_view * include/experimental/synchronized_value * include/experimental/system_error * include/experimental/timer * include/experimental/tuple * include/experimental/type_traits * include/experimental/unordered_map * include/experimental/unordered_set * include/experimental/vector * include/ext/algorithm * include/ext/cmath * include/ext/functional * include/ext/iterator * include/ext/memory * include/ext/numeric * include/ext/random * include/ext/rb_tree * include/ext/rope * include/parallel/algorithm * include/std/algorithm * include/std/any * include/std/array * include/std/atomic * include/std/barrier * include/std/bit * include/std/bitset * include/std/charconv * include/std/chrono * include/std/codecvt * include/std/complex * include/std/concepts * include/std/condition_variable * include/std/coroutine * include/std/deque * include/std/execution * include/std/expected * include/std/filesystem * include/std/format * include/std/forward_list * include/std/fstream * include/std/functional * include/std/future * include/std/generator * include/std/iomanip * include/std/ios * include/std/iosfwd * include/std/iostream * include/std/istream * include/std/iterator * include/std/latch * include/std/limits * include/std/list * include/std/locale * include/std/map * include/std/memory * include/std/memory_resource * include/std/mutex * include/std/numbers * include/std/numeric * include/std/optional * include/std/ostream * include/std/print * include/std/queue * include/std/random * include/std/ranges * include/std/ratio * include/std/regex * include/std/scoped_allocator * include/std/semaphore * include/std/set * include/std/shared_mutex * include/std/span * include/std/spanstream * include/std/sstream * include/std/stack * include/std/stacktrace * include/std/stdexcept * include/std/streambuf * include/std/string * include/std/string_view * include/std/syncstream * include/std/system_error * include/std/text_encoding * include/std/thread * include/std/tuple * include/std/type_traits * include/std/typeindex * include/std/unordered_map * include/std/unordered_set * include/std/utility * include/std/valarray * include/std/variant * include/std/vector * include/std/version * include/tr1/array * include/tr1/cfenv * include/tr1/cinttypes * include/tr1/cmath * include/tr1/complex * include/tr1/cstdbool * include/tr1/cstdint * include/tr1/cstdio * include/tr1/cstdlib * include/tr1/cwchar * include/tr1/cwctype * include/tr1/functional * include/tr1/memory * include/tr1/random * include/tr1/regex * include/tr1/tuple * include/tr1/type_traits * include/tr1/unordered_map * include/tr1/unordered_set * include/tr1/utility * include/tr2/bool_set * include/tr2/dynamic_bitset * include/tr2/type_traits * libsupc++/atomic_lockfree_defines.h * libsupc++/compare * libsupc++/cxxabi.h * libsupc++/cxxabi_forced.h * libsupc++/cxxabi_init_exception.h * libsupc++/exception * libsupc++/initializer_list * libsupc++/new * libsupc++/typeinfo: Likewise. * testsuite/20_util/ratio/operations/ops_overflow_neg.cc * testsuite/23_containers/array/tuple_interface/get_neg.cc * testsuite/23_containers/vector/cons/destructible_debug_neg.cc * testsuite/24_iterators/operations/prev_neg.cc * testsuite/ext/type_traits/add_unsigned_floating_neg.cc * testsuite/ext/type_traits/add_unsigned_integer_neg.cc * testsuite/ext/type_traits/remove_unsigned_floating_neg.cc * testsuite/ext/type_traits/remove_unsigned_integer_neg.cc: Adjust line numbers. gcc/testsuite/ChangeLog * g++.dg/analyzer/fanalyzer-show-events-in-system-headers-default.C * g++.dg/analyzer/fanalyzer-show-events-in-system-headers-no.C * g++.dg/diagnostic/disable.C: #define _GLIBCXX_SYSHDR.
2024-04-17libstdc++: Implement "Printing blank lines with println" for C++23Jonathan Wakely1-0/+14
This was recently approved for C++26 at the Tokyo meeting. As suggested by Stephan T. Lavavej, I'm defining it as an extension for C++23 mode (when std::print and std::prinln were first added) rather than as a new C++26 feature. Both MSVC and libc++ have agreed to do this too. libstdc++-v3/ChangeLog: * include/std/ostream (println(ostream&)): Define new overload. * include/std/print (println(FILE*), println()): Likewise. * testsuite/27_io/basic_ostream/print/2.cc: New test. * testsuite/27_io/print/1.cc: Remove unused header. * testsuite/27_io/print/3.cc: New test.
2024-02-28libstdc++: Fix std::print for CygwinJonathan Wakely1-1/+1
Cygwin should use std::fwrite, not WriteConsoleW. And the -lstdc++exp library is only needed when running the tests on *-*-mingw*. libstdc++-v3/ChangeLog: * include/std/ostream (vprint_unicode) [__CYGWIN__]: Use POSIX code path for Cygwin instead of Windows. * include/std/print (vprint_unicode) [__CYGWIN__]: Likewise. * testsuite/27_io/basic_ostream/print/1.cc: Only add -lstdc++exp for *-*-mingw* targets. * testsuite/27_io/print/1.cc: Likewise.
2024-01-08libstdc++: Implement P2905R2 "Runtime format strings" for C++20Jonathan Wakely1-1/+1
This change makes std::make_format_args refuse to create dangling references to temporaries. This makes the std::vformat API safer. This was approved in Kona 2023 as a DR for C++20 so the change is implemented unconditionally. libstdc++-v3/ChangeLog: * include/bits/chrono_io.h (__formatter_chrono): Always use lvalue arguments to make_format_args. * include/std/format (make_format_args): Change parameter pack from forwarding references to lvalue references. Remove use of remove_reference_t which is now unnecessary. (format_to, formatted_size): Remove incorrect forwarding of arguments. * include/std/ostream (print): Remove forwarding of arguments. * include/std/print (print): Likewise. * testsuite/20_util/duration/io.cc: Use lvalues as arguments to make_format_args. * testsuite/std/format/arguments/args.cc: Likewise. * testsuite/std/format/arguments/lwg3810.cc: Likewise. * testsuite/std/format/functions/format.cc: Likewise. * testsuite/std/format/functions/vformat_to.cc: Likewise. * testsuite/std/format/string.cc: Likewise. * testsuite/std/time/day/io.cc: Likewise. * testsuite/std/time/month/io.cc: Likewise. * testsuite/std/time/weekday/io.cc: Likewise. * testsuite/std/time/year/io.cc: Likewise. * testsuite/std/time/year_month_day/io.cc: Likewise. * testsuite/std/format/arguments/args_neg.cc: New test.
2024-01-08libstdc++: Add Unicode-aware width estimation for std::formatJonathan Wakely1-1/+1
This implements the requirements in the following proposals, which dictate how std::format deals with non-ASCII strings: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1868r1.html https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2572r1.html https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2675r1.pdf There are two parts to this. The width estimation for strings must only count the width of the first character in an extended grapheme cluster. That requires implementing the algorithm for detecting cluster breaks, which requires a number of lookup tables of the grapheme cluster break properties (and Indic_Conjunct_Break and Extended_Pictographic properties) of every code point. Additionally, some characters have a field width of 2, which requires another lookup table of field widths for every code point. The tables added in this commit do not contain entries for every code point from 0 to 0x10FFFF as that would be very inefficient and use too much memory. Instead the tables only contain the code points that form an "edge" for a property, omitting all the code points that have the same property as the preceding one. We can use a binary search to find the closest code point in the table that is not greater than the one we're looking for. The tables are generated by a new Python script added to the contrib/unicode directory, and a new data file downloaded from the Unicode Consortium website. The rules for extended grapheme cluster breaking are implemented for the latest Unicode standard, version 15.1.0. libstdc++-v3/ChangeLog: * include/Makefile.am: Add new headers. * include/Makefile.in: Regenerate. * include/bits/unicode.h: New file. * include/bits/unicode-data.h: New file. * include/std/format: Include <bits/unicode.h>. (__literal_encoding_is_utf8): Move to <bits/unicode.h>. (_Spec::_M_fill): Change type to char32_t. (_Spec::_M_parse_fill_and_align): Read a Unicode scalar value instead of a single character. (__write_padded): Change __fill_char parameter to char32_t and encode it into the output. (__formatter_str::format): Use new __unicode::__field_width and __unicode::__truncate functions. * include/std/ostream: Adjust namespace qualification for __literal_encoding_is_utf8. * include/std/print: Likewise. * src/c++23/print.cc: Add [[unlikely]] attribute to error path. * testsuite/ext/unicode/view.cc: New test. * testsuite/std/format/functions/format.cc: Add missing examples from the standard demonstrating alignment with non-ASCII characters. Add examples checking correct handling of extended grapheme clusters. contrib/ChangeLog: * unicode/README: Add notes about generating libstdc++ tables. * unicode/GraphemeBreakProperty.txt: New file. * unicode/emoji-data.txt: New file. * unicode/gen_libstdcxx_unicode_data.py: New file.
2023-12-15libstdc++: Simplify std::vprint_unicode for non-Windows targetsJonathan Wakely1-3/+7
Since we don't need to do anything special to print Unicode on non-Windows targets, we might as well just use std::vprint_nonunicode to implement std::vprint_unicode. Removing the duplicated code should reduce code size in cases where those calls aren't inlined. Also use an RAII type for the unused case where a non-Windows target calls __open_terminal(streambuf*) and needs to fclose the result. This makes the code futureproof in case we ever start using the __write_terminal function for non-Windows targets. libstdc++-v3/ChangeLog: * include/std/ostream (vprint_unicode) [_WIN32]: Use RAII guard. (vprint_unicode) [!_WIN32]: Just call vprint_nonunicode. * include/std/print (vprint_unicode) [!_WIN32]: Likewise.
2023-12-14libstdc++: Implement C++23 <print> header [PR107760]Jonathan Wakely1-0/+138
This adds the C++23 std::print functions, which use std::format to write to a FILE stream or std::ostream (defaulting to stdout). The new extern symbols are in the libstdc++exp.a archive, so we aren't committing to stable symbols in the DSO yet. There's a UTF-8 validating and transcoding function added by this change. That can certainly be optimized, but it's internal to libstdc++exp.a so can be tweaked later at leisure. Currently the external symbols work for all targets, but are only actually used for Windows, where it's necessary to transcode to UTF-16 to write to the console. The standard seems to encourage us to also diagnose invalid UTF-8 for non-Windows targets when writing to a terminal (and only when writing to a terminal), but I'm reliably informed that that wasn't the intent of the wording. Checking for invalid UTF-8 sequences only needs to happen for Windows, which is good as checking for a terminal requires a call to isatty, and on Linux that uses an ioctl syscall, which would make std::print ten times slower! Testing the std::print behaviour is difficult if it depends on whether the output stream is connected to a Windows console or not, as we can't (as far as I know) do that non-interactively in DejaGNU. One of the new tests uses the internal __write_to_terminal function directly. That allows us to verify its UTF-8 error handling on POSIX targets, even though that's not actually used by std::print. For Windows, that __write_to_terminal function transcodes to UTF-16 but then uses WriteConsoleW which fails unless it really is writing to the console. That means the 27_io/print/2.cc test FAILs on Windows. The UTF-16 transcoding has been manually tested using mingw-w64 and Wine, and appears to work. libstdc++-v3/ChangeLog: PR libstdc++/107760 * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/bits/version.def (__cpp_lib_print): Define. * include/bits/version.h: Regenerate. * include/std/format (__literal_encoding_is_utf8): New function. (_Seq_sink::view()): New member function. * include/std/ostream (vprintf_nonunicode, vprintf_unicode) (print, println): New functions. * include/std/print: New file. * src/c++23/Makefile.am: Add new source file. * src/c++23/Makefile.in: Regenerate. * src/c++23/print.cc: New file. * testsuite/27_io/basic_ostream/print/1.cc: New test. * testsuite/27_io/print/1.cc: New test. * testsuite/27_io/print/2.cc: New test.
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