Add '_WINDLL' definition for the MSVC compilers family.
Check the 'FEATURE_optimize_size' value before replacing compiler flags
in the qt_internal_add_optimize_full_flags function. This is required,
because Qt::Core and Qt::Gui modules lost their ability to shrink,
when selecting the appropriate build type or features.
Fixes: QTBUG-89952
Change-Id: I982c25ea84e4793b4006ead0ee516b3f3eb2a054
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Functions in QtFlagHandlingHelpers.cmake try to update the CMake cache
variables for compiler and linker flags. These were using the current
value of those variables and writing the modified ones back to the
cache every time CMake ran. If a toolchain file sets or modifies any of
these variables, that updated value is used and written back into the
cache instead of the original cache variable's value. The next time
CMake executes, the toolchain file re-applies the same change and the
variable grows longer each time with flags repeated. With Ninja, this
causes a complete rebuild every time CMake is re-run. The Android NDK
toolchain file is one example where this behavior is triggered (the
fault is shared, one could argue that the NDK should only be setting
..._INIT variables, but that's out of our control).
Another related bug in the previous implementation was that the flags
used to build after the first CMake execution could be different to
those used for all builds after the second and later CMake runs. This
is because the CMake cache was being updated, but not always the
calling scope of the functions that modified them. If a toolchain file
set any of the compiler or linker flag variables as non-cache
variables, then updating the cache variable would have no effect on
the calling scope. The non-cache variable would continue to take
precedence for that scope for that run. The next time CMake executes
though, the updated cache variable would now have been used by the
toolchain file and the change *will* be part of the non-cache
variable's value.
The above are examples of why you should try to avoid updating these
cache variables from project code. We could leave the cache alone and
always update only non-cache variables, but then a developer looking
at the cache may wonder why the values they see there don't match the
values being used in builds. Or worse, they think the cache values
are being used and don't realize the builds are using something
different. Ultimately, we have to choose which downside we are happy
to live with. The changes here preserve the previous intent of
updating the cache, but it's still a bit fragile.
Fixes: QTBUG-89821
Task-number: QTBUG-85992
Task-number: QTBUG-86866
Change-Id: I8a16753e159bde338e6d2e5dd2ce91fc8ac5c39d
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
*Not* using /permissive- exposes Qt and client apps to interesting
bugs and/or build failures, (e.g. QTBUG-87225, or
19b5520abf). We demand strict
conformance by any other compiler, it's time to demand it from
MSVC too.
The Windows headers themselves are clean starting from the
Windows Fall Creators SDK (10.0.16299.0), and moreover Qt 6 will
drop WinRT; therefore, the comment in the mkspecs does not apply
any more.
Since /permissive- implies /Zc:referenceBinding, drop that
option. The other implied options are set on MSVC < 2017,
but I leave them in to avoid tinkering with the fragile lists
of C/C++ flags.
Rename the CMake internal helper function to better describe
what it does.
Fixes: QTBUG-85633
Fixes: QTBUG-85637
Fixes: QTBUG-85635
Fixes: QTBUG-88244
Change-Id: Ie03fddb61aa066fdc14b7231c22e7108b4a02fbb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
1. clang-cl doesn't support "-fno-exceptions", it uses msvc's parameter.
2. some parameters supported by msvc are not supported by clang-cl
and they are causing huge warning message flood, don't add them.
3. use correct optimize parameter for clang-cl.
Change-Id: Idbadf139127143c5fa6c49068588cb26f47da7a2
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
When linking static libraries, MSVC's link.exe complains about
the unknown parameter "/INCREMENTAL:NO" and output a lot of warning
messages about this. This doesn't happen when it's linking exes
or dlls.
The situation is a lot more worse when we are using clang-cl.
clang-cl will print some error message like it can't find a
file named "/INCREMENTAL:NO" and just stop compiling. It seems
clang-cl treat unknown parameters as input files.
Fixes: QTBUG-87875
Change-Id: I37ed29de082b0258e81494db54f275417ab42708
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Instead of propagating the deprecation wranings, we compiled all code
with -Ddeprecations.
Change-Id: I0233ddc85bdbdcb93d366073b2cea5d47bdbe52a
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Introduce a new feature called 'FEATURE_msvc_obj_debug_info' which
should allow usage of sccache for Windows MSVC configs.
Enabling the feature will replace the default '/Zi' compile flag
that CMake sets in Windows-MSVC.cmake with '/Z7'.
This ensures that the debug info is placed into the compiled object
file instead of placing it in the compilation .pdb file via
mspdbsrv.exe.
The final pdb file will still be created for shared libraries and
executables due to the linker '/debug' flag.
Static libraries will not have a .pdb file, instead the debug info
being embeeded in the .lib file.
The downsides of using '/Z7' are more disk space usage, slower
link times, more memory used for linking because the linker needs
to deal with more symbols.
The upside is that caching each indepedent cl.exe call is possible.
This is what Chromium uses with goma, and Firefox with sccache.
We're not enabling the feature by default to allow easier
testing (and switching it off) in the CI if it proves not to be
feasible.
It will probably have to be disabled at least for building
qtwebengine due to high memory requirements.
Task-number: QTQAINFRA-3934
Change-Id: I89e0e57995e938a780be318d1faec700194aa93f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Enabling it will force usage of '-O3' flag when building Qt.
If the platform has no '-O3' flag, use '-O2' as a fallback.
Task-number: QTBUG-86866
Change-Id: If13f7de954ba5c01dc9634f06a85529828fe90a9
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Introduce a bunch of helper functions to manipulate compiler
flags and linker flags for the
CMAKE_<LANG>_FLAGS_<CONFIG>
and
CMAKE_<LINK_TYPE>_LINKER_FLAGS_<CONFIG>
CMake variables.
These variables can be assigned and modified either in the cache
or for a specific subdirectory scope, which will apply the flags
only to targets in that scope.
Add qt_internal_add_optimize_full_flags() function which mimics
qmake's CONFIG += optimize_full behavior.
Calling it will force usage of the '-O3' optimization flag on supported
platforms (falling back '-O2' where not supported).
Use the function for the Core and Gui subdirectories, to enable full
optimization for the respective Qt modules as it is done in the qmake
projects.
To ensure that the global qmake-like compiler flags are assigned
eveywhere,
qt_internal_set_up_config_optimizations_like_in_qmake() needs
to be called after Qt global features like optimize_size and
optimize_full are available.
This means that qtbase and its standalone tests need some special
handling in regards to when to call that function.
Task-number: QTBUG-86866
Change-Id: Ic7ac23de0265561cb06a0ba55089b6c0d3347441
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Apparently the combination of the --no-undefined linker flag together
with ASAN when building on Linux with Clang does not work.
Disable --no-undefined flag in such a scenario. Note that linux-clang
mkspec doesn't add that flag at all, which is why asan builds work
there.
Change-Id: I6167c757ce4be5d2263311bc84e5fb445b0f7c2d
Fixes: QTBUG-86879
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
This configure switch controls the feature 'optimize_size'.
This isn't merely a mapping to CMAKE_BUILD_TYPE=MinSizeRel, because
we potentially want to combine -optimize-size with -force-debug-info,
which maps to CMAKE_BUILD_CONFIG=RelWithDebInfo.
Task-number: QTBUG-85373
Change-Id: I1a9343ebc54816f52e90e9d33ea3df4c99b1ec9f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
There are inconsistencies in the default optimization flags added by
CMake across configurations like Release and RelWithDebInfo.
In particular Release uses -O3, whereas RelWithDebInfo uses -O2,
as well as usage of /INCREMENTAL in release configs with MSVC, etc.
To make sure that the Qt 6 binaries built with CMake are consistent
across configs, as well as consistent with the flags we used when
building Qt 5 with qmake, add a horrible search and replace mechanism
to replaces the CMake flags with what our mkspecs indicate to use.
Ideally this would be done by providing custom CMake toolchain files
for each platform we support, and we might revisit that later if the
need really arises.
To implement the replacing, we first need the flags that should be
added. Port the QMAKE_CFLAGS_OPTIMIZE variables to CMake, which is
done in QtCompilerOptimization.cmake.
Then a new function called
qt_internal_set_up_config_optimizations_like_in_qmake will look for
any kind of optimization flags set in the
CMAKE_<LANG>_FLAGS_<CONFIG> style variables, remove them, and add
the appropriate flags that qmake mkspecs provide.
On some platforms (like Windows MSVC) the function also alters the
linker CMAKE_${TYPE}_LINKER_FLAGS_<CONFIG> style variables.
The mechanism allows opting out of this replacing by
setting the QT_USE_DEFAULT_CMAKE_OPTIMIZATION_FLAGS value.
It also allows opting into removal of flags for custom configs by
providing QT_ADDITIONAL_OPTIMIZATION_FLAG_CONFIGS. It's only removal,
because we wouldn't know what kind of config it is, and thus what
flags to add.
The currently modified configs are: Release, RelWithDebInfo,
MinSizeRel, Debug aka the usual default CMake provided ones.
The mechanism is only applied to C-like languages.
ASM is not handled to be on the safe side due to not knowing what kind
of compiler flags the platform assembler might take.
It's also important to skip RC on MSVC platforms.
Task-number: QTBUG-85992
Change-Id: I3712d5cd5a34fceab54f56a6fa46b4e678952362
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
QtBuild.cmake is huge. Split it.
Move module, plugin, tools, executables and test related functions out
of QtBuild.cmake into separate files.
Do the same for many other things too.
An additional requirement is that all the new Helpers files only
define functions and macros.
No global variable definitions are allowed, nor execution of commands
with side effects.
Some notes:
qt_install_qml_files is removed because it's dead code.
Some functions still need to be figured out, because they are
interspersed and depend on various global state assignments.
Task-number: QTBUG-86035
Change-Id: I21d79ff02eef923c202eb1000422888727cb0e2c
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
