[libcxx] [test] Calling min and max on an empty valarray is UB.
libcxx/test/std/numerics/numarray/template.valarray/valarray.members/min.pass.cpp
libcxx/test/std/numerics/numarray/template.valarray/valarray.members/max.pass.cpp
The calls `v1.min();` and `v1.max();` were emitting nodiscard warnings
with MSVC's STL. Upon closer inspection, these calls were triggering
undefined behavior. N4842 [valarray.members] says:
"T min() const;
8 Preconditions: size() > 0 is true.
T max() const;
10 Preconditions: size() > 0 is true."
As these tests already provide coverage for non-empty valarrays
(immediately above), I've simply deleted the code for empty valarrays.
[libcxx] [test] Add macros to msvc_stdlib_force_include.h (NFC).
libcxx/test/support/msvc_stdlib_force_include.h
These macros are being used by:
libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp
Defining them to nothing allows that test to pass.
[libcxx] [test] Silence MSVC warning C5063 for is_constant_evaluated (NFC).
libcxx/test/std/utilities/meta/meta.const.eval/is_constant_evaluated.pass.cpp
This test is intentionally writing code that MSVC intentionally warns
about, so the warning should be silenced.
Additionally, comment an endif for clarity.
[libcxx] [test] Silence MSVC warning C4127 (NFC).
libcxx/test/support/charconv_test_helpers.h
MSVC avoids emitting this warning when it sees a single constexpr value
being tested, but this condition is a mix of compile-time and run-time.
Using push-disable-pop is the least intrusive way to silence this.
[libcxx] [test] Silence MSVC truncation warning (NFC).
libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
This test is intentionally truncating float to int, which MSVC
intentionally warns about, so push-disable-pop is necessary.
[libcxx] [test] Avoid truncation warnings in erase_if tests (NFC).
libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
libcxx/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
libcxx/test/std/containers/unord/unord.map/erase_if.pass.cpp
libcxx/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
These tests use maps with `short` keys and values, emitting MSVC
truncation warnings from `int`. Adding `static_cast` to `key_type`
and `mapped_type` avoids these warnings.
As these tests require C++20 mode (or newer), for brevity I've changed
the multimap tests to use emplace to initialize the test data.
This has no effect on the erase_if testing.
Too many warnings are being disabled too quickly. Warnings are
important to keeping libc++ correct. This patch re-enables two
warnings: -Wconstant-evaluated and -Wdeprecated-copy.
In future, all warnings disabled for the test suite should require
an attached bug. The bug should state the plan for re-enabling that
warning, or a strong case why it should remain disabled.
Since C++11, [depr.impldec]:
The implicit definition of a copy constructor as defaulted is deprecated
if the class has a user-declared copy assignment operator or a
user-declared destructor.
At clang HEAD, -Wdeprecated-copy (included by -Wextra) will warn on such instances.
Reviewed By: EricWF
Differential Revision: https://reviews.llvm.org/D71096
LLVM has moved to C++14, and the libc++ build should too.
C++14 is needed to provide constant initialization for certain global
objects.
I suspect this change may break some older GCC buildbots, and I'll clean
those up as they fall.
Summary:
The __name__ attribute is the correct way to get a function name in
Python 3. This also works with Python 2.
Reviewers: jroelofs, EricWF
Subscribers: christof, ldionne, libcxx-commits
Tags: #libc
Differential Revision: https://reviews.llvm.org/D71136
target_info is inferred to WindowsLocalTI on Windows hosts unless
specified otherwise. In the latter case, it doesn't make sense to use
Windows-specific settings if the target is not Windows.
This change should not break anything, because target_info is inferred
based on what platform.system() returns. self.is_windows was set based
on the same platform.system() call.
Thanks to Sergej Jaskiewicz for the patch.
Differential Revision: https://reviews.llvm.org/D68275
These are a part of the libc so linking these explicitly isn't necessary
and embedding these as deplibs causes link time error.
This issues was introduced in a9b5fff which changed how we emit deplibs.
Differential Revision: https://reviews.llvm.org/D71135
This is a followup to 35bc5276ca. It fixes the dependent libs usage
in libcxx and libcxxabi to link pthread and rt libraries only if CMake
detects them, rather than based on explicit platform blacklist.
Differential Revision: https://reviews.llvm.org/D70888
Android API level 21 and above have all these functions available, so we
don't need to include our fallback definitions.
Differential Revision: https://reviews.llvm.org/D69983
This apparently breaks weird use cases where the build directory is on
a separate drive. Someone reported that failure to me privately.
I can't remember of a reason for collating the two arguments in the
first place, so I don't think this should break anything.
Summary:
Android added quick_exit()/at_quick_exit() in API level 21,
aligned_alloc() in API level 28, and timespec_get() in API level 29,
but has the other C11 features at all API levels (since they're basically
just coming from clang directly).
_LIBCPP_HAS_QUICK_EXIT and _LIBCPP_HAS_TIMESPEC_GET already existed,
so we can reuse them. (And use _LIBCPP_HAS_TIMESPEC_GET in a few more
places where _LIBCPP_HAS_C11_FEATURES has been used as a proxy. This
isn't correct for Android.)
_LIBCPP_HAS_ALIGNED_ALLOC is added, to cover aligned_alloc() (obviously).
Add a missing std:: before aligned_alloc in a cstdlib test, and remove a
couple of !defined(_WIN32)s now that we're explicitly testing
TEST_HAS_ALIGNED_ALLOC rather than TEST_HAS_C11_FEATURES.
Reviewers: danalbert, EricWF, mclow.lists
Reviewed By: danalbert
Subscribers: srhines, christof, libcxx-commits
Tags: #libc
Differential Revision: https://reviews.llvm.org/D69929
Summary:
Rewrite the in-tree build to be a clearer tl;dr like we have for the
out-of-tree build.
Reviewers: EricWF, mclow.lists, ldionne
Reviewed By: ldionne
Subscribers: dexonsmith, christof, ldionne, enh, libcxx-commits
Tags: #libc
Differential Revision: https://reviews.llvm.org/D69917
With the upcoming introduction of iterator concepts in ranges,
the meaning of "__is_contiguous_iterator" changes drastically.
Currently we intend it to mean "does it have this iterator category",
but it could now also mean "does it meet the requirements of this
concept", and these can be different.
These traits are currently unused because we don't implement ranges.
However, their addition is part of ongoing work to allow libc++
to optimize on user-provided contiguous iterators.
This function has the same behavior as the now-standand std::to_address.
Re-using the name makes the behavior more clear, and in the future it
will allow us to correctly get the raw pointer for user provided pointer
types.
We effectively never want to export that function, which is an
implementation detail of libc++. This was previously tried in
603715c66b and then reverted in 8335dd314f because it caused
linker warnings. These linker warnings should go away now that we
use internal_linkage instead of always_inline to implement per-TU
insulation.
This change would have warned about the bug found in D62451.
No unit tests since the exception should never throw.
Differential Revision: https://reviews.llvm.org/D62452
Same idea as the current algorithm, that is, add (half of the difference between a and b) to a.
But we use a different technique for computing the difference: we compute b - a into a pair of integers that are named "sign_bit" and "diff". We have to use a pair because subtracting two 32-bit integers produces a 33-bit result.
Computing half of that is a simple matter of shifting diff right by 1, and adding sign_bit shifted left by 31. llvm knows how to do that with one instruction: shld.
The only tricky part is that if the difference is odd and negative, then shifting it by one isn't the same as dividing it by two - shifting a negative one produces a negative one, for example. So there's one more adjustment: if the sign bit and the low bit of diff are one, we add one.
For a demonstration of the codegen difference, see https://godbolt.org/z/7ar3K9 , which also has a built-in test.
Differential Revision: https://reviews.llvm.org/D69459
Use the builtin CMake support for specifying the proper flags for the targets to
build at a certain C++ standard. This avoids unnecessary checks in CMake,
speeding up the configure phase as well as simplifies the logic overall.
PR13592 was caused by a problem in how to compiler implemented the
__is_convertible_to intrinsic. That problem, reported as PR13591,
was fixed back in 2012. We don't support such old versions of Clang
anyway, so we don't need the library workaround that had been added
to solve PR13592 (while waiting for the compiler fix).
Eric Fiselier