The Intel whitepaer[1] recommends using the RDSEED over RDRAND whenever
present. libstdc++ from GCC 10 will also use it in std::random_device.
[ChangeLog][QtCore][QRandomGenerator] The system() random generator will
now use the RDSEED instruction on x86 processors whenever available as
the first source of random data. It will fall back to RDRAND and then to
the system functions, in that order.
[1] https://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide
Change-Id: I907a43cd9a714da288a2fffd15bab176e54e1975
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Makes it possible to build user projects and Qt with C++2a. It is not
automatically upgraded to yet though.
Change-Id: I949ce94871ddc53f21b7265a52b9c0e1370456c8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: I963fc1c159edc644f081675c3dee248c25d7c9dc
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
fbbe8aba9d introduced a check for
MSVC_VER to qmake, which is not set in win32-clang-msvc,
causing the build to fail:
Mkspec does not specify MSVC_VER. Cannot continue.
Unable to generate output for: .../config.tests/verifyspec/Makefile
Extract a minimal msvc-based-version.conf which determines
MSVC_VER from QMAKE_MSC_VER for win32-clang-msvc and win32-icc.
Task-number: QTBUG-63512
Change-Id: Ia6de8c4b1aae2ae1962cf4e60e3e6d51fdbbbabe
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Move the definition of _ENABLE_EXTENDED_ALIGNED_STORAGE
to msvc-desktop.conf so that it becomes effective
for all compilers using MSVC (icc, clang-cl).
Task-number: QTBUG-50804
Change-Id: I5ff612cc0f5a712b855925f9bcf645e578e80504
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
We need -Zc:__cplusplus in order to enable the __cplusplus macro having
the correct value. This causes configure to now print:
Checking for C++14 support... yes
Checking for C++1z support... yes
and
Using C++ standard ..................... C++1z
Change-Id: I5d0ee9389a794d80983efffd152c95a4d9d8adbc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
mingw-w64 toolchain:
- add missing compiler definitions, similar to
'msvc-desktop.conf' toolchain,
- describe the reasons of missing compiler definitions, available in
'msvc-desktop.conf' toolchain,
- add missing 'QMAKE_CXXFLAGS' and 'QMAKE_CXXFLAGS_WARN_ON' variables,
similar to 'msvc-desktop.conf' toolchain.
ICC on Windows toolchain:
- add 'QMAKE_CFLAGS_OPTIMIZE_FULL' variable, similar to 'gcc-base.conf'
toolchain, though left it unused for now,
- add missing flags to 'QMAKE_CFLAGS' variable, similar to
'msvc-desktop.conf' toolchain,
- update deprecated 'Qwd' flag with 'Qdiag-disable',
- use 'QMAKE_CFLAGS_OPTIMIZE_DEBUG' variable instead of '-Od' flag,
similar to 'gcc-base.conf' toolchain (ICC implies '-O2' optimization
level by default, while MSVC implies '-Od'),
- add 'QMAKE_CFLAGS_UTF8_SOURCE' variable, similar to
'msvc-version.conf' toolchain; use a workaround to initialize it,
until '-utf-8' flag would be supported by ICC on Windows,
- update deprecated '-Qstd=c++1z' flag with '-Qstd=c++17',
MSVC toolchain:
- remove 'incremental' from MSVC 'CONFIG' variable, since it has
relevance only for the Unix generator,
- add 'QMAKE_CFLAGS_OPTIMIZE_DEBUG' variable, used in ICC for Windows
toolchain,
- add empty 'QMAKE_LIBS' variable, similar to 'win32-g++' toolchain,
- add 'uuid.lib' library to 'QMAKE_LIBS_GUI' variable, similar to
'win32-g++' toolchain,
- add C++14 and C++17 language support flags, though left them disabled
for now, similar to 'win32-icc' toolchain.
Change-Id: Ideef62d0422674184836faa655bfc5d09a5f612f
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
It seems the compiler supports /arch:AVX512 and /arch:AVX512F but none
of the other switches (and neither are documented). And when you pass
those, you also get Conflict Detection (CD), Double & Quad (DQ), Byte &
Word (BW) and Vector Length (VL), which matches the ICC switch
"-xCORE-AVX512". Unlike ICC, there doesn't seem to be an option to
enable only the common part of AVX-512.
Support for Intel Xeon Phi's current features (Exponential &
Reciprocation and Prefetch) and future ones (IFMA, VBMI, 4FMAPS, 4VNNI
and VPOPCNTDQ) seems to be missing altogether.
See https://blogs.msdn.microsoft.com/vcblog/2017/07/11/microsoft-visual-studio-2017-supports-intel-avx-512/
Change-Id: I98105cd9616b8097957db680d73eb1f86e487e6d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
This definition causes a build error if concrt.h is included.
According to Microsoft [1], this macro is unsupported. It was added in
f5908363 to silence compiler warnings that are generated when exceptions
are turned off and certain STL headers are included.
We specifically disable the warnings in question now.
[1] https://blogs.msdn.microsoft.com/vcblog/2015/07/14/stl-fixes-in-vs-2015-part-2/
Task-number: QTBUG-63409
Change-Id: I567d5d46292fbd7898394e217bb0987fbcdca9de
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The instruction is "RDRAND", but the feature name, according to GCC, is
RDRND, so I had to change some macros in qsimd_p.h.
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5166779137e63
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The flag makes the build fail for UWP as well as desktop Windows . It
will trigger a compile error as soon as UWP API is used, which happens
in qtbase for desktop in the direct2d backend, but it is also used for
other Qt modules, so we decided to disable the flag for now.
This patch partly reverts b7d76e533c
Task-number: QTBUG-61239
Change-Id: I0cc630f4c09c52f0c116f4a7b95a44c3a55e0be3
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
That's not the same as -Za.
Change-Id: Ica9894dc9b5e48278fd4fffd14bb316b687abffe
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Let's not allow any new code that uses non-conforming syntaxes. With
GCC and like, we already use -std=c++11 instead of -std=gnu++11 for that
very reason.
Change-Id: I4a7dc1fe14154695b968fffd14aba9f8cea69c47
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Neither the Intel compiler nor Visual C++ have a dedicated switch to
enable F16C support, like GCC and Clang do. So we used the AVX switch
for that in commit 8241d51f70, as it was
the closest, lowest denominator. That was incorrect and insufficient.
The Intel compiler silently miscompiles the intrinsics with -xAVX,
making calls to out-of-line functions like _mm_cvtps_ph, which don't
exist. So we actually have to use AVX2 support to generate correct code.
That might be a problem later, since Ivy Bridge supports F16C but not
AVX2.
Visual C++ is able to generate F16C code with just -arch:AVX.
Either way, since there's no dedicated command-line switch, there's also
no dedicated preprocessor macro. We're using __AVX2__ for both
compilers, as that's a sufficient condition to indicate a processor that
supports F16C.
Change-Id: I27b55fdf514247549455fffd14b205b8d8b86da7
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Building qt with msvc would fail with the -developer-build configure
option turned on under simplified chinese locale.
This is because msvc will emit warnings for source files with utf-8
characters which are not representable in CP936, and -developer-build
implies treating warnings as errors.
This patch turn on -utf-8 compiler option for msvc2015 update 2
and up only for building qt.
Task-number: QTBUG-58161
Change-Id: If38ea11eb1f39f8e08efa1cccb92e0eea50daf92
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Since we can tell the MSVC version from the compiler now, each of the
qmake.conf files is now the same, so let's just have "win32-msvc" and be
future-proof. Likewise for win32-clang-msvc.
qplatformdefs.h was already common.
Since we can't obtain the MSVC version from the unified mkspec name any
more, I dropped the warning level during the qmake bootstrap to reduce
the number of warnings that need to be disabled from compiler version to
version.
There is no point in keeping the old mkspecs, but configure will re-map
the -platform argument to the unified spec as necessary, to keep
existing configure command lines working.
[ChangeLog][Visual Studio] Qt now has a common mkspec for all Visual
Studio versions, called "win32-msvc". The old names which contained the
version number are now gone (but qmake scopes based on the old names
continue to work). The version of the compiler can be obtained from the
MSC_VER and MSVC_VER variables (for example, for Visual Studio 2015,
those contain the values 1900 and 14.0, respectively). Those variables
are also available with the Intel compiler (win32-icc) and with Clang
(win32-clang-msvc).
Done-with: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Change-Id: Ib57b52598e2f452985e9fffd14587c0a77a5c09c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
We're asking the compiler anyway, so we can fully use this information
just as well. Note that this actually happens after the spec itself has
been processed, so it was necessary to delay the version-specific flag
handling as well.
Change-Id: Ib57b52598e2f452985e9fffd14587b581d946022
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
