| Commit message (Collapse) | Author | Age | Files | Lines |
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A comment in the existing implementation encouraged doing so, but for
a bug in GCC 6. We no longer care.
Change-Id: Ia8cb2bc5e184510e3d756e8bbfe6bc0e852e6830
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Amends 22c92f39670d0376478cc2e73a17307508f86692
Task-number: QTBUG-98545
Change-Id: Ifaa7e4884f0eb1caa6d3d4906a2701f8fa5e43c2
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
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Augments e0ecb0ded21082f4e00ee77411339009cb1294a4
Pick-to: 6.2
Change-Id: I4eea51b66ffa5ffe45faa3c51a4b65a526dd73e7
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
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The old code had several bugs:
- it immediately clobbered *this with new state, before having copied
over the elements from the old to the new buffer
- when buffer relocation threw, it would keep the new (partially-filled)
buffer and throw away the old
- it unconditionally used std::move() for non-relocatable types, making
it impossible to restore the original buffer when a move throws
Instead of clobbering *this with new state, do all the work on the
side and change *this only once the reallocation has happened
successfully.
Also use q_uninitialized_relocate_n() and unique_ptr in the
implementation to simplify the code. The former got the necessary
update to use std::move_if_noexcept() instead of an unconditional
std::move() for the non-relocatable case.
[ChangeLog][QtCore][QVarLengthArray] The append()-like functions are
now strongly exception safe. This means reallocation will now use
copies instead of moves, unless the value_type has a noexcept move
constructor.
Fixes: QTBUG-99039
Change-Id: I031251b8d14ac045592d01caed59d4638c3d9892
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Less code duplication, means less functions to move into the
upcoming QVLABase.
Change-Id: I67a817c971a4e5a81ae45ff30282878be1bde2aa
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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These functions don't deserve to be defined outside the class body,
as they're trivial wrappers around reallocate().
Cleans up the header somewhat, in preparation of the upcoming
QVLABase/QVLAStorage split.
Change-Id: Ib4062eca4214a67e67f472a7c1e4bf4d9813c8a4
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Simplifies the code, since we now need neither the manual size check,
nor the warning fix (checked iterator macro) for MSVC.
Change-Id: Ic267c66eb4568d2db8d9c9ccad0ce7e1a5cc3373
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Exclude the check introduced by 0dc6cc055174a0556f2e41ca269013b3a7056c86
for clang compilers since there seems to be no equivalent option
-permissive- for the MSVC emulation.
Change-Id: I0468d8e2f2c988e604be6960f1b1f4760ea0c400
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
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This commit extends functionality for QLocale::codeToLanguage()
and QLocale::languageToCode() by adding an additional argument
that allows selection of the ISO 639 code-set to consider for
those operations.
The following ISO 639 codes are supported:
* Part 1
* Part 2 bibliographic
* Part 2 terminological
* Part 3
As a result of this change the codeToLanguage() overload without
the additional argument now returns a Language value if it matches
any know code. Previously a valid language was returned only if
the function argument matched the first code defined for that
language from the above list.
[ChangeLog][QtCore][QLocale] Added overloads for codeToLanguage()
and languageToCode() that support specifying which ISO 639 codes
to consider.
Fixes: QTBUG-98129
Change-Id: I4da8a89e2e68a673cf63a621359cded609873fa2
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
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Functionality is being added in other repos which require finalizers
to be run for non-static builds. That means we now need to ensure
finalizers always run even with CMake versions before
cmake_language() was added. The fallback method of writing to a file
and including it is slower, but that's better than missing important
functionality altogether.
Task-number: QTBUG-98545
Pick-to: 6.2
Change-Id: Ic8668c91c26d0c30de084b1b803032088c10fcf4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Task-number: QTBUG-98545
Change-Id: Ifd5c0f4ce278c683bb0d3ba6a259ec14a7f24181
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
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Task-number: QTBUG-98545
Change-Id: I581c1173cdfc92c09fd2cf0bbe7ec6bc8d52b868
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
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If the in-place constructor throws, the old code had already updated
the container's size(). Fix by delaying the update to after the
in-place construction.
[ChangeLog][QtCore][QVarLengthArray] Fixed a bug whereby a failed
append() would leave the container with an inconsistent size().
Pick-to: 6.2 5.15
Change-Id: Ief1e668d945149bd8ba96c8af1398baaa7876880
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Change-Id: I9aeeb2cef4d068020e0c176a70ad86c9e28b0e68
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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This reverts commit d62e9d3c5bd9d3aae5f4b72ed0688dcbd02134a7.
Reason for revert: The -Wstringop-overread option was introduced in
gcc 11. This fixes the build for gcc 9 and 10.
Change-Id: I96ab5f917d6200cb1681fe6236f1fd4630ef4f7d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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This is implemented in two passes, first we try the older and
always available DeviceIoControl() function. This works most of
the time, though it might fail for example for storage devices
attached via USB. In this case, we try to dynamically load the
newer NtQueryVolumeInformationFile kernel function. Since this
is probably more expensive, we do this as fallback.
[ChangeLog][QtCore][QStorageInfo] The QStorageInfo::blockSize()
will now report the physical block size of a storage device under
Windows. Network mapped drives are not supported.
Fixes: QTBUG-93976
Change-Id: I08b5b879e5bf79c025e2e305196ec5c5fce8b20f
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
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Change-Id: I0929f7653cb07665842d0aa7bf18dc80471febdc
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
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QVarLengthArray is neither implicitly shared, nor does it feature a
magic resize() on out-of-bounds.
Therefore, data() doesn't detach(), so 't' remains stable.
The only reason for the copy, then, would be if T wasn't
self-assignment-safe, but we don't support such types.
Remove the copy.
Change-Id: I8dd12e1c9b8131ae17d641354fe362554062b78d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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The functions aren't const so begin() will return a mutable
iterator. The function arguments, however, are const_iterators.
It doesn't matter for QVLA, which isn't implicitly shared, but code
hygiene suggests to use cbegin() instead, to compare const_iterators
to const_iterators.
Change-Id: I9bfa993780ee4b68d13f6b6410772b0f1ccedad3
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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In preparation of splitting the class into QVLABase and
QVLAStorage.
Task-number: QTBUG-84785
Change-Id: Ic0da6c2e110a5b979b78989616b9a2cb0f27463b
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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If one destroys a running QThread, so far the behavior has been to crash
(à la std::thread) -- assuming the thread hasn't already signalled that
it has finished. This behavior is hostile to solutions such as using
QThread::create(), which always require a wait() before destroying the
thread object.
We can use the opportunity to change the behavior without breaking any
valid code. Instead of crashing, inside QThread's destructor we can ask
the new thread to quit, and then join it (à la std::jthread). This
simplifies the implementation of long-living runnables and the code that
manages them.
Deploying this solution for the whole QThread class may not be entirely
painless. While no correct code would work differently with the proposed
changes, incorrect code that deletes a running thread would no longer
crash "loudly" -- instead, it might deadlock "quietly", have memory
corruptions, etc.
Hence I'm limiting this approach to only the threads created by
QThread::create(), at least for the time being. This also side-steps
perhaps the biggest problem of generalizing the approach, which is that
placing such interrupt+join logic into~QThread's destructor would cause
it to be run _after_ a QThread subclass' own destructor has run,
destroying the subclass' data members too early. This might create
an antipattern if one chooses to subclass QThread. With create(), a
subclass in question exists, and it indeed has NSDMs, but it's entirely
under our control (in fact, I'm placing the logic just in its dtor).
[ChangeLog][QtCore][QThread] Destroying a QThread object created by
QThread::create() while the thread that it manages is still running will
now automatically ask that thread to quit, and will wait until the
thread has finished. Before, this resulted in a program crash. See the
documentation of QThread::~QThread() for more details.
Change-Id: Ib268b13da422e277ee3ed6f6c7b2ecc8cea5750c
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
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remove(i) is the same as remove(i, 1), and the extra 'n' argument is
of trivial type, so it's ok to default it instead of overloading.
Change-Id: Id926cd63fde518e002684a41e055edc1004247a4
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Previously, only the printf-style overloads were marked as such.
Saves ~7KB in QtCore text size on Linux AMD64 GCC 11 C++ 20 builds.
Change-Id: I4ed480e48060b87968f3d15bb5a84bdbcf70a647
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Factor the assertions relating to sizes and indexes into an inline
function, verify(). This hopefully reduces the string data generated
for assertions to the bare minimum.
Change-Id: Iad5c2e587ad189e7e1a62b9ca61ada4282c44f51
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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When deleting the last item in a chain, without it being the last item
in the chain, then we re-use the iterator which was passed in as an
argument. This is wrong if we detached earlier in the function, and
means we return an iterator to the previously shared data.
Pick-to: 6.2
Change-Id: I7da6309e23a32073da59e7da0cbfd1d16734f1ca
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
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Open the file only if matching on content is needed.
Use QFileInfo::filePath() instead of QFileInfo::absoluteFilePath() in
QMimeDatabase::mimeTypeForFile(). filePath() does much less work, and so
is faster. Thiago Macieira helpfully explained in a review comment why
the absolute path is not useful for correctness here: "Nothing needs
absolute paths within the same application that would resolve the
relative path to absolute. You only need an absolute path if you're
communicating with another application that may be in a different
directory."
QMimeDatabase::mimeTypeForFile() checks fileInfo.isDir(), so the
fileName.endsWith(QLatin1Char('/')) check in
QMimeDatabasePrivate::mimeTypeForFileNameAndData() was redundant when
called from this function. The other two callers of that function now
check this condition before opening IO devices. This improves
performance of the two QMimeDatabase::mimeTypeForFileNameAndData()
overloads in the corner case.
Refactor and optimize QMimeDatabasePrivate::findByFileName() and its
usages. Previously each caller constructed a QFileInfo object and passed
QFileInfo::fileName() into this function. Now the callers simply pass an
absolute or relative path to a file into this function, which then uses
QFileSystemEntry::fileName() to exclude the path. Constructing QFileInfo
is relatively expensive, so this change slightly improves performance.
Optimize QMimeDatabasePrivate::loadProviders() by calling static
QFileInfo::exists() instead of constructing a QFileInfo object and
calling the non-static QFileInfo::exists() overload. Note that the
QFileInfo object was always created, even if QFileInfo::exists() under
an `if` and an `#if` was never called.
The following table contains the average results of the added benchmark
tst_QMimeDatabase::benchMimeTypeForFile() on my GNU/Linux system before
and at this commit. The numbers denote milliseconds per iteration.
data row tag before at
MatchDefault:
archive 0.029 0.016
OpenDocument Text 0.029 0.015
existent archive with extension 0.039 0.025
existent C with extension 0.033 0.020
existent text file with extension 0.033 0.020
existent C w/o extension 0.076 0.074
existent patch w/o extension 0.11 0.105
existent archive w/o extension 0.069 0.066
MatchExtension:
archive 0.012 0.0115
OpenDocument Text 0.0115 0.011
existent archive with extension 0.017 0.016
existent C with extension 0.011 0.011
existent text file with extension 0.011 0.011
existent C w/o extension 0.016 0.0155
existent patch w/o extension 0.013 0.012
existent archive w/o extension 0.013 0.012
MatchContent:
archive 0.019 0.012
OpenDocument Text 0.019 0.012
existent archive with extension 0.053 0.051
existent C with extension 0.056 0.0545
existent text file with extension 0.058 0.056
existent C w/o extension 0.0605 0.059
existent patch w/o extension 0.10 0.099
existent archive w/o extension 0.057 0.054
Change-Id: Idb541656e073a2c4822ace3f4da412f29f2351f8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: David Faure <david.faure@kdab.com>
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Change-Id: I865dc51d466d90636e177556d95558ba66f466de
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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- GHS compiler is not fully compliant with iec559. Therefore we need
to update is_iec559 checking for GHS case.
Pick-to: 6.2
Change-Id: Ia094509d26bf5f0109f2937547a056267019cffb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>
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The allows qmetatype.cpp compilation to enjoy PCH again.
Change-Id: I47c5af33a5dbc930ee4c120b254e732c52bc2369
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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It's a precondition and we might just as well check it, given that
people have actually got the order of the arguments wrong (cf.
QTBUG-69330).
Unfortunately, Q_ASSERT is defined below qBound in qglobal.h, so I had
to reshuffle some code around.
Change-Id: I82e52bcb863ff8c96594817e0cd5d7d2abe2e57e
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
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[ChangeLog][QtCore][QStringBuilder] Added support for QByteArrayView.
Change-Id: If2c23549d533dd31c320f3ee455fcd01ea5b460a
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
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The new overload allows creation of files with non-default permissions.
This is useful when files need to be created with more restrictive
permissions than the default ones, and removes the time window when
such files are available with less restrictive permissions.
[ChangeLog][QtCore][QFile] Added QDir::open() overload that
accepts permissions argument.
Fixes: QTBUG-79750
Change-Id: Iddfced3c324e03f2c53f421c9b31c76dee82df58
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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The new argument allows atomic creation of files with non-default
permissions.
Task-number: QTBUG-79750
Change-Id: I4c49455b41f924ba87148302c8d0f77f5de0832b
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Fix the parameter types corresponding to the sample code and subclasses
Fixes: QTBUG-98578
Pick-to: 6.2
Change-Id: I06e342ae1210ed53c5deec3e2711457cf2ac5b15
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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There are no users left in the tree.
Change-Id: I336f4e15c0ec1f5933c1fcfa661bad85bd38ed35
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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We can now get qt_configure_strs to tell us the size of the string, as
well as its start, bypassing the strlen()-calling branch of
fromLocal8Bit() that caused the need for a hack using a volatile
variable. However, QT_CONFIGURE_SETTINGS_PATH still needs the volatile
hack.
Change-Id: I0181abf512123e6355acdd506d6845c3fb75c0e3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Commit 6cee204d56205e250b0675c9c6d4dd8a2367f3c4 introduced overloads
of lastIndexOf() which drop the 'from' argument, inadvertently fixing
QTBUG-80694, but failed to provide the new overloads for all existing
lastIndexOf() overloads, making the fix for QTBUG-80694 incomplete.
This patch completes the fix, by adding the missing overloads (for
char-likes) and also adds the missing (non-regex) tests to
tst_qstringapisymmetry.
Also amends 1c164ec7f21a78025475c561a70b94d1e3dd6bb6.
Fixes: QTBUG-80694
Change-Id: Ib4b3d597d658ce2edf01a2bce0d711ecea593d6e
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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cmake_automoc_parser has the logic preventing the run of moc with the
--collect-json parameter if metatype json files are not changed.
This logic only verify if the file list is changed but not their
content. This change adds a timestamp file that contains the last
metatype json file timestamp that was modified during the last
cmake_automoc_parser run. The logic still prevents of running
'moc --collect-json' when the list of metatype json files is not
changed, but also checks if their content is no changed.
Another approach it to generate the depfile that can be utilized by
CMake in add_custom_command as DEPFILE argument. But this concept only
works from the second build attempt because of an issue related to
dyndep.
Pick-to: 6.2
Fixes: QTBUG-98532
Change-Id: I713f8bfa9ae769cefe0beac0b7fa19750b00a765
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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Encapsulate configuration options in a function and use it instead of
a globally defined variable.
Pick-to: 6.2
Change-Id: I5c69c207788fe069fdd046b68a6bc58aa16e71b4
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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qt_internal_${target}_copy_apk_dependencies should use CMake DEPFILE
approach when it's possible. Since we don't have any specific
artifact that androiddeployqt can produce when collecting dependencies
this change adds simple timestamp file that is touched each time when
androiddeployqt is running. The timestamp is used then as a file-level
dependency for the qt_internal_${target}_copy_apk_dependencies target.
Task-number: QTBUG-88841
Change-Id: I985535c7b6e471cb4cfbf90128628087dadc72d0
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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Instead of generating external projects that build the project tree
for each target, this creates a single project for each ABI that have
the common for all targets configure steps. Each executable target
then adds additional build step to each ABI-specific external project,
that builds and copies dependencies to the "main" project build tree.
To resolve dependencies from the build tree, when building multi-abi
apk instead of scanning the build directories of external projects for
dependencies, it makes sense to run androiddeployqt for each
ABI-specific external project to copy all necessary libraries. This
is done by adding --copy-dependencies-only flag to androiddeployqt
that only copies the apk dependencies, but avoids creating apk and all
the essential steps. The ABI-specific external project now handles the
deploying of the build artifacts to the end-point apk deployment
directory and the "main" project assembles the apk using collected
artifacts. The ABI-specific external project uses the
qt_internal_${target}_copy_apk_dependencies target to run androiddeployqt
with the introduced --copy-dependencies-only flag.
TODO: Build steps that build and copy the ABI-specific apk
dependencies are non-skipable and will run each time top-level build
is triggered. This behavior should be fixed by adding dependencies to
the generated by androiddeployqt DEPFILES for each ABI in the
top-level build.
Task-number: QTBUG-88841
Tash-number: QTBUG-94714
Change-Id: Id442a9fbd589f58b70f4204c5215645056b379a2
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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And mention the example in the bindable properties docs.
Pick-to: 6.2
Task-number: QTBUG-97655
Change-Id: I676e90dbda66c2e718c7f6c2240fac608a8653df
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Cleaner. Probably also more efficient at compile time, who knows?
Also more consistent, since _some_ static if's were already
constexpr'ed.
Change-Id: I9657f7cf2166975f562db52e9f90630aaf412986
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Two more instances where we can use public API instead of accessing the data members directly.
Amends 9d79e5f26ca58e7ddbb6367de044d05192107a4d.
Task-number: QTBUG-84785
Change-Id: I2037339383836b0d292b3362fe1d6b056638e81a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
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ABI-specific external projects should use the same config as the one is
used by the "main" ABI.
Task-number: QTBUG-88841
Change-Id: If7a1834d9a3f238f6dadd05323ccc0cf8552128c
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
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std::function, which is used to store the type-erased continuation
lambdas, requires the passed callable to be copy-constructible. This
makes impossible to use move-only callables with continuations/handlers.
In particular, it makes impossible passing lambdas that are capturing
move-only objects. The workaround is to store the continuation lambda
inside a wrapper for the callable, which stores the move-only lambda in
a QSharedPtr and can be stored in std::function, since it's copyable.
Pick-to: 6.2
Fixes: QTBUG-98493
Change-Id: I8b7a22fcf68dc132b3c533216a7a1665e9f9fb0a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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Instead of calling the QVLA(qsizetype) ctor and letting the optimizer
and inliner have a field day on them, simply set the trivial values
for a, s, and ptr manually.
Mark it as noexcept.
Task-number: QTBUG-84785
Change-Id: I011826eacdaf63a4c37b21465e5fe4a6e70a1ab7
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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According to the CMake documentation any relative paths in DEPFILE
should be relative to the CMAKE_CURRENT_BINARY_DIR if the CMP0116
is set to NEW. This also forces CMP0116 to NEW if the policy exists.
Pick-to: 6.2
Change-Id: I3d697b008ea06effb2247bc204da9bcc4e9046b4
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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Add target triggering AAB creation. Since the _make_aab target is
not added to the ALL set, we may avoid dependency check for it and
admit that the target is "always out of date".
[ChangeLog][Android][Platform Specific Changes] Add the extra
_make_aab targets for each executable target, that can be used
to generate android app bundles. Also add aab metatarget to build
all _make_aab targets that are created in the project.
Pick-to: 6.2
Fixes: QTBUG-96710
Change-Id: I3b0c7fbb5a7dd493ca7a124c4e4b91fd857386bd
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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The only documented replacements for Q*String*::arg() are sequences like
%1, %2, %3 -- where the n-th number is expressed using a sequence of
ASCII digits [1].
The code parsing the replacements however used the QChar::digitValue()
function. That function simply checks if a QChar has a *Unicode digit
value* (no matter what its block/category is), and if so, returns the
corresponding digit value as an int (otherwise returns -1).
The result of this is that a sequence like "%¹" or "%१" actually
triggered substitutions (both count as "1"). Similarly, QChars with
a digit value would be parsed as part of longer sequences like "%1²"
(counting as "12" (!)).
This behavior is weird, undocumented, and extremely likely the usual
backstabbing by Unicode by using "convenience" QChar methods -- that is,
never *intended* by the implementation.
This commit deprecates (via warnings) such usages, which for the time
being are left working as before (in the name of backwards
compatibility). At the same time: given it's extremely unlikely that
someone would be deliberately relying on this behavior, it implements
the desired change of behavior (only accept sequences of ASCII digits)
starting from Qt 6.6, that is, after the next LTS.
Throughout Qt 6's lifetime users will still be able to control arg()'s
behavior by setting an env variable, but that variable (and the support
for Unicode digits) will disappear in Qt 7.
To summarize:
* Qt 6.3->6.5: default is Unicode digits, env var to control
* Qt 6.6->6.x: default is ASCII digits, env var to control
* Qt 7: only ASCII digits, no env var
[1] That's the name Unicode gives to them, cf. https://www.unicode.org/charts/PDF/U0000.pdf
[ChangeLog][QtCore][Deprecation Notices] The arg() functions
featured in Qt string classes have always been documented to require
replacements tokens to be sequences of ASCII digits (like %1, %2, %34,
and so on). A coding oversight made it accept sequences of arbitrary
characters with a Unicode digit value instead. For instance, "%2੩" is
interpreted as the 23rd substitution; and "%1²" is interpreted as the
12th substitution. This behavior is deprecated, and will result in
runtime warnings. Starting from Qt 6.6, arg()'s behavior will be changed
to accept only ASCII digits by default. That means that "%1²" is going
to be interpreted as substitution number 1 followed by the "²" character
(which does not get substituted, so it gets left as-is in the result).
Users can restore the previous semantics (accept Unicode digits) by
setting the QT_USE_UNICODE_DIGIT_VALUES_IN_STRING_ARG environment
variable to a non-zero value. In Qt 7, arg() will only support sequences
of ASCII digits. Note that from Qt 6.3 users can also set
QT_USE_UNICODE_DIGIT_VALUES_IN_STRING_ARG to zero; this will make arg()
use ASCII digits only, in preparation for the future change of defaults.
Change-Id: I8a044b629bcca6996e76018c9faf7c6748ae04e8
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
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