P0482R6 deprecated these functions for C++20. There was a ballot comment
on the C++23 CD saying to un-deprecate it, but LEWG just rejected that,
so let's add attributes to deprecate them.
libstdc++-v3/ChangeLog:
* include/bits/fs_path.h (u8path): Add deprecated attribute.
* testsuite/27_io/filesystem/path/construct/90281.cc: Add
-Wno-deprecated-declarations for C++20 and later.
* testsuite/27_io/filesystem/path/factory/u8path-char8_t.cc:
Likewise.
* testsuite/27_io/filesystem/path/factory/u8path.cc: Likewise.
* testsuite/27_io/filesystem/path/native/string.cc: Likewise.
* testsuite/27_io/filesystem/path/factory/u8path-depr.cc: New test.
Since the r12-4515-g58f339fc5eaae7 change std::random_device::entropy()
returns non-zero for hardware sources such as RDRAND. However, the call
to the underlying _M_getentropy function is conditionally compiled
according to #if _GLIBCXX_USE_DEV_RANDOM which means it only happens for
targets that support /dev/random and /dev/urandom. This means entropy()
always returns zero for x86 Windows, even though the RDRAND and RDSEED
sources work there.
The _M_getentropy() function is always compiled into the library, it
just doesn't get called for targets without /dev/random. We can change
that just by removing the #if conditional. This is not an ABI change,
because new code will just start calling the existing _M_getentropy
function, old code that has inlined entropy() will not call it.
Similarly, the std::random_device destructor doesn't call the underlying
_M_fini function unless _GLIBCXX_USE_DEV_RANDOM is defined. That's less
of a problem because it's still true that the only resources that need
to be freed are when one of /dev/random or /dev/urandom has been opened
for reading, which is only possible when _GLIBCXX_USE_DEV_RANDOM is
defined. The _M_fini function does also destroy a random engine object
if a std::linear_congruential_engine object is used, but that destructor
is trivial and so no resources are leaked if it's not called. Remove the
preprocessor condition in the destructor too, so that we always call the
_M_fini function even if it doesn't have side effects. This makes the
destructor non-trivial for Windows and bare metal targets, but as the
class is non-copyable that shouldn't cause any ABI change in practice.
libstdc++-v3/ChangeLog:
* include/bits/random.h (random_device) [!_GLIBCXX_USE_DEV_RANDOM]:
Always call _M_fini and _M_getentropy.
The config for --with-libstdcxx-zoneinfo=yes was comparing the target
triplet to "gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu" which is only
the last component of the triplet, so failed to match and always used
the zoneinfo_dir=none default. Check $target_os instead.
There was also an error in the check for native builds that tzdata.zi is
actually present in the configured directory. That meant a warning was
printed even when the file was present:
configure: zoneinfo data directory: /usr/share/zoneinfo
configure: WARNING: "/usr/share/zoneinfo does not contain tzdata.zi file"
configure: static tzdata.zi file will be compiled into the library
libstdc++-v3/ChangeLog:
* acinclude.m4 (GLIBCXX_ZONEINFO_DIR): Check $target_os instead
of $host. Fix check for file being present during native build.
* configure: Regenerate.
When building src/c++20/tzdb.cc we currently get a build error for
--with-default-libstdcxx-abi=gcc4-compatible because std::chrono::tzdb
and related types are not declared for the gcc4-compatible ABI (unless
--disable-libstdcxx-dual-abi is also used, so that the gcc4-compatible
ABI is the only one built).
Define _GLIBCXX_USE_CXX11_ABI in tzdb.cc so that for a dual-abi build we
always build it for the cxx11 ABI.
libstdc++-v3/ChangeLog:
* src/c++20/tzdb.cc (_GLIBCXX_USE_CXX11_ABI): Define to 1.
libstdc++-v3/ChangeLog:
PR libstdc++/108413
* include/c_compatibility/stdatomic.h: Change copyright line to
be consistent with other headers contributed under DCO terms.
* include/std/expected: Add full stop to copyright line.
* src/c++20/tzdb.cc: Likewise.
Use the global override_used to tell whether the target supports the
override functionality that the test_reload and test_erase functions
rely on.
libstdc++-v3/ChangeLog:
* testsuite/std/time/tzdb_list/1.cc: Remove dg-xfail-run-if
and fail gracefully if defining the weak symbol doesn't work.
This shouldn't be in the common options, it's already added for the
relevant targets using dg-additional-options.
libstdc++-v3/ChangeLog:
* testsuite/30_threads/jthread/jthread.cc: Remove -pthread from
dg-options.
For a port with signed char and unsigned wchar_t initializing a wchar_t
array with a char is a narrowing conversion. The code is wrong for
assuming that (int)'a' == (int)L'a' anyway, so fix it properly by using
ctype<wchar_t>::widen(char).
libstdc++-v3/ChangeLog:
* testsuite/std/time/clock/utc/io.cc: Use ctype to widen char.
__cxa_demangle is only to demangle C++ names, for all C functions,
extern "C" functions, and including main it returns -2, in that case
just adapt the given name. Otherwise it's kept empty, which doesn't look
nice in the stacktrace.
libstdc++-v3/ChangeLog:
* include/std/stacktrace (stacktrace_entry::_S_demangle): Use
raw __name if __cxa_demangle could not demangle it.
Signed-off-by: Björn Schäpers <bjoern@hazardy.de>
This allows most of the tzdb functionality to be disabled by
configuring with --with-libstdcxx-zoneinfo=no. This might be desirable
for small targets that don't need the time zone support.
libstdc++-v3/ChangeLog:
* src/c++20/tzdb.cc (TZDB_DISABLED): Disable all code for
loading tzdb.
* testsuite/std/time/tzdb/leap_seconds.cc: Require tzdb
effective target.
* testsuite/std/time/tzdb_list/1.cc: Likewise.
This adds a copy of the tzdata.zi file to the library, and allows
configuring to use it instead of a copy read from disk at runtime.
The content of the file is in the public domain, but will need to be
updated to the latest upstream file before making GCC releases.
libstdc++-v3/ChangeLog:
* acinclude.m4 (GLIBCXX_ZONEINFO_DIR): Replace the
--with-libstdcxx-zoneinfo-dir configure option with
--with-libstdcxx-zoneinfo with yes/no/static choices as well as
a directory.
* config.h.in: Regenerate.
* configure: Regenerate.
* doc/xml/manual/configure.xml: Document configure option.
* doc/html/manual/configure.html: Regenerate.
* src/c++20/Makefile.am: Generate tzdata.zi.h header.
* src/c++20/Makefile.in: Regenerate.
* src/c++20/tzdb.cc (__gnu_cxx::zoneinfo_dir_override): Return a
null pointer if no directory is configured.
(zoneinfo_dir): Replace with ...
(zoneinfo_file): New function.
(tzdata_stream): New istream class.
(remote_version, reload_tzdb): Use tzdata_stream.
* testsuite/lib/libstdc++.exp (check_effective_target_tzdb):
Check new _GLIBCXX_STATIC_TZDATA macro and ignore presence of
tzdata.zi file in default location.
* src/c++20/tzdata.zi: New file.
libstdc++-v3/ChangeLog:
* include/bits/chrono_io.h (operator<<): Fix syntax errors.
* testsuite/std/time/month_day/io.cc: New test.
* testsuite/std/time/month_day_last/io.cc: New test.
* testsuite/std/time/month_weekday/io.cc: New test.
* testsuite/std/time/month_weekday_last/io.cc: New test.
* testsuite/std/time/weekday_indexed/io.cc: New test.
* testsuite/std/time/weekday_last/io.cc: New test.
* testsuite/std/time/year_month/io.cc: New test.
* testsuite/std/time/year_month_day_last/io.cc: New test.
* testsuite/std/time/year_month_weekday/io.cc: New test.
* testsuite/std/time/year_month_weekday_last/io.cc: New test.
This needs to be included explicitly now that we don't include all of
<system_error> here.
libstdc++-v3/ChangeLog:
* include/bits/std_mutex.h: Include <errno.h>.
libstdc++-v3/ChangeLog:
* testsuite/20_util/to_chars/version.cc: Mark hosted-only.
* testsuite/20_util/uses_allocator/lwg3677.cc: Ditto.
* testsuite/20_util/weak_ptr/cons/self_move.cc: Ditto.
* testsuite/std/ranges/adaptors/as_rvalue/1.cc: Replace usage of
std::make_unique with a freestanding-compatible wrapper around
unique_ptr.
* testsuite/21_strings/basic_string_view/operations/contains/char.cc:
Don't test for presence of __cpp_lib_string_contains on !HOSTED.
* testsuite/21_strings/basic_string_view/operations/contains/char/2.cc:
Ditto.
* testsuite/std/ranges/version_c++23.cc: Don't test for presence
of __cpp_lib_ranges in !HOSTED.
Fixes the conversion from UTF-8 to UTF-16 to properly return partial
instead ok.
Fixes the conversion from UTF-16 to UTF-8 to properly return partial
instead ok.
Fixes the conversion from UTF-8 to UCS-2 to properly return partial
instead error.
Fixes the conversion from UTF-8 to UCS-2 to treat 4-byte UTF-8 sequences
as error just by seeing the leading byte.
Fixes UTF-8 decoding for all codecvts so they detect error at the end of
the input range when the last code point is also incomplete.
libstdc++-v3/ChangeLog:
PR libstdc++/86419
* src/c++11/codecvt.cc (read_utf8_code_point): Correctly detect
errors in incomplete multibyte sequences.
(utf16_in): Remove surrogates parameter. Fix conditions for
returning partial.
(utf16_out): Fix condition for returning partial.
(ucs2_in): Do not pass surrogates argument to utf16_in.
* testsuite/22_locale/codecvt/codecvt_unicode.cc: New test.
* testsuite/22_locale/codecvt/codecvt_unicode.h: New header for
tests.
* testsuite/22_locale/codecvt/codecvt_unicode_wchar_t.cc: New
test.
GCC 13 has a new implementation of gthr-win32.h which supports C++11
mutexes, threads etc. but this causes an unintended ABI break. The
__gthread_mutex_t type is always used in std::basic_filebuf even in
C++98, so independent of whether C++11 sync primitives work or not.
Because that type changed for the win32 thread model, we have a layout
change in std::basic_filebuf. The member is completely unused, it just
gets passed to the std::__basic_file constructor and ignored. So we
don't need that mutex to actually work, we just need its layout to not
change.
Introduce a new __gthr_win32_legacy_mutex_t struct in gthr-win32.h with
the old layout, and conditionally use that in std::basic_filebuf.
PR libstdc++/108331
libgcc/ChangeLog:
* config/i386/gthr-win32.h (__gthr_win32_legacy_mutex_t): New
struct matching the previous __gthread_mutex_t struct.
(__GTHREAD_LEGACY_MUTEX_T): Define.
libstdc++-v3/ChangeLog:
* config/io/c_io_stdio.h (__c_lock): Define as a typedef for
__GTHREAD_LEGACY_MUTEX_T if defined.
The new symbols need to be exported, as well as some of the
std::locale::facet::id globals, which are not new but were presumably
not needed by any inline functions before now.
libstdc++-v3/ChangeLog:
PR libstdc++/108327
* config/os/gnu-linux/ldbl-extra.ver (GLIBCXX_LDBL_3.4.31):
Export __try_use_facet specializations for facets in namespace
__gnu_cxx_ldbl128.
* config/os/gnu-linux/ldbl-ieee128-extra.ver
(GLIBCXX_IEEE128_3.4.31): Likewise for facets in namespace
__gnu_cxx_ieee128.
* testsuite/util/testsuite_abi.cc: Add to lists of known and
latest versions.
The <condition_variable>, <mutex>, and <shared_mutex> headers use
std::errc constants, but don't use std::system_error itself. They only
use the __throw_system_error(int) function, which is defined in
<bits/functexcept.h>.
By including the header for the errc constants instead of the whole of
<system_error> we avoid depending on the whole std::string definition.
libstdc++-v3/ChangeLog:
* include/bits/std_mutex.h: Remove <system_error> include.
* include/std/condition_variable: Add <bits/error_constants.h>
include.
* include/std/mutex: Likewise.
* include/std/shared_mutex: Likewise.
GCC's std::max_align_t doesn't agree with the system malloc on HP-UX, so
generalize the current hack for Solaris to apply to that target too.
libstdc++-v3/ChangeLog:
PR libstdc++/77691
* include/experimental/memory_resource
(_GLIBCXX_MAX_ALIGN_MATCHES_MALLOC): Define.
(do_allocate, do_deallocate): Check it.
* testsuite/experimental/memory_resource/new_delete_resource.cc:
Relax expected behaviour for 64-bit hppa-hp-hpux11.11.
For non-futex targets the __platform_wait_t type is currently uint64_t,
but that requires a lock in libatomic for some 32-bit targets. We don't
really need a 64-bit type, so use unsigned long if that is lock-free,
and int otherwise. This should mean it's lock-free on a wider set of
targets.
libstdc++-v3/ChangeLog:
* include/bits/atomic_wait.h (__detail::__platform_wait_t):
Define as unsigned long if always lock-free, and unsigned int
otherwise.
Some standard algorithms fail to compile when size_t or ptrdiff_t is
narrower than int. The __lg helper function is ambiguous if ptrdiff_t is
short or __int20, so replace it with a function template that works for
those types as well as signed/unsigned int/long/long long. The helpers
for stable_sort perform arithmetic on size values and assume the types
won't change, which isn't true if the type promotes to int.
libstdc++-v3/ChangeLog:
PR libstdc++/108221
* include/bits/stl_algobase.h (__lg): Replace six overloads with
a single function template for all integer types.
* include/bits/stl_algo.h (__merge_adaptive_resize): Cast
arithmetic results back to _Distance.
The default constructor has a constraint that is always false if
arithmetic on size_t values promotes to int. Rewrite the constraint
exactly as written in the standard, which works correctly.
libstdc++-v3/ChangeLog:
PR libstdc++/108221
* include/std/span (span::span()): Un-simplify constraint to
work for size_t of lesser rank than int.
For some tarets the weak symbol is always defined, so we get a warning
that its address is never null. The warning isn't useful in this case,
so suppress it.
libstdc++-v3/ChangeLog:
PR libstdc++/108228
* src/c++20/tzdb.cc (zoneinfo_dir): Add diagnostic pragma.
Abstract the atomic counter used to synchronize access to time_zone
infos behind a Lockable class API, and use atomic_signed_lock_free
instead of atomic<int_least32_t>, as that should be the most efficient
type. (For futex-supporting targets it makes no difference, but might
benefit other targets in future.)
The new API allows the calling code to be simpler, without needing to
repeat the same error prone preprocessor conditions in multiple places.
It also allows using template metaprogramming to decide whether to use
the atomic or a mutex, which gives us more flexibility than only using
preprocessor conditions. That allows us to choose the mutex
implementation for targets such as hppa-hp-hpux11.11 where 32-bit
atomics are not lock-free and so would introduce an unwanted dependency
on libatomic.
libstdc++-v3/ChangeLog:
PR libstdc++/108235
* src/c++20/tzdb.cc (time_zone::_Impl::RulesCounter): New class
template and partial specialization for synchronizing access to
time_zone::_Impl::infos.
(time_zone::_M_get_sys_info, reload_tzdb): Adjust uses of
rules_counter.
The use of alloca in a constructor is wrong, because the memory is gone
after the constructor returns, and will be overwritten by a subsequent
function call. This didn't show up in testing because function inlining
alters the stack usage.
libstdc++-v3/ChangeLog:
PR libstdc++/108214
* include/std/bitset (operator>>): Use alloca in the right
scope, not in a constructor.
* testsuite/20_util/bitset/io/input.cc: Check case from PR.
If we don't have std::to_chars for floating-point types (either because
float and double are not IEEE format, or size_t is 16-bit) then we can't
use them with std::format. This causes a bootstrap failure since
std/c++20/tzdb.cc was added to the library, because <chrono> now
includes <format>.
This change just disables formatting support for those types. This is
not a proper fix, but solves the bootstrap failure for now.
libstdc++-v3/ChangeLog:
PR libstdc++/108221
* include/std/format (basic_format_arg) [!__cpp_lib_to_chars]:
Disable visiting floating-point types.
