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>
/OPT:REF is enabled for release builds for MSVC by default,
however, clang-cl may not enable it without this flag,
add it to MSVC's mkspec so that all compilers based on MSVC
can benefit from it as well.
Change-Id: Ia80c20a8510cfa1e4687e39104ce99b37a2aa13f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
clang-cl will never support C++ standards newer than
C++14 without these flags.
I didn't add them to msvc-based-version.conf because
on Windows, only clang-cl use the same flags with MSVC,
both ICC and MinGW have their own flags. So they are
clang-cl specific flags.
Change-Id: Ia44a5ea4237c77ea5e897fffded32cbc008a4729
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Clang-cl couldn't find the header given to it by -FI when it isn't in
any of the included directories.
Additionally clang-cl 8 has a bug with exported templated classes with
inline methods that causes it to have missing symbols at link time. We
work around this.
Fixes: QTBUG-74563
Change-Id: I7becf05fa8edb07bd4cefe12bee3737e5e1dfa14
Reviewed-by: Yuhang Zhao <2546789017@qq.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
To enable LTCG, clang-cl.exe need "-flto" instead of "-GL". But if you
enabled LTO, the lib tool will have to change to "llvm-lib.exe" and the
link tool also need to change to "lld-link.exe", because msvc linker
will see these lib files as corrupted files. Leave QMAKE_LFLAGS_LTCG
empty because lld-link doesn't need any additional parameters.
Fixes: QTBUG-72402
Change-Id: Ia34d98bd1ad919d542ea3eac83944bf8c40ce0cd
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
with 40e87491 merged, 'QMAKE_CXXFLAGS' variable in
'win32-g++' toolchain became defined via 'QMAKE_CFLAGS'.
the similar can be found in 'win32-clang-msvc' and
'win32-icc' toolchains too.
this works for now, because such definitions just duplicates code
from includes, like 'gcc-base.conf', 'msvc-desktop.conf', etc.
but it would became broken, if changes would be applied to
'QMAKE_CXXFLAGS' definitions in that includes, prior
to the redefinitions in 'win32-*/qmake.conf' toolchains.
thus 'QMAKE_CXXFLAGS' definitions in 'win32-*/qmake.conf' toolchains
should not depend on 'QMAKE_CFLAGS' and be done explicitly.
in order to apply this change correctly to 'win32-icc' toolchain,
its 'QMAKE_CFLAGS' variable should become dependent on definitions
in the includes, similar to 'win32-clang-msvc' and
'win32-msvc' toolchains.
Change-Id: I5e820e44a769a590ba63f70dcb3a115311093311
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Pass it through as a traditional clang argument instead of relying on
what MSVC cl.exe can take.
Change-Id: I94405ce6ab80d16b687e62c9aa4b2866ba84f0e2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
In release mode, MSVC linker will enable it by default
while clang-cl won't. So enable it explicitly.
Change-Id: Iabfd8698d426290fee59662acf6c124b9f226c11
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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>
