Summary:
Certain C libraries require configuration macros defined in __config
to provide the correct functionality for libc++. This patch ensures
that the C header math.h is always included after the __config
header. It also adds a Windows-specific #if guard for the case when
the C math.h file is included the second time, as suggested by
Marshall in https://reviews.llvm.org/rL323490.
Fixes PR36382.
Reviewers: mclow.lists, EricWF
Reviewed By: mclow.lists
Subscribers: cfe-commits, pcc, christof, rogfer01
Differential Revision: https://reviews.llvm.org/D43579
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@325760 91177308-0d34-0410-b5e6-96231b3b80d8
Code on Windows expects to be able to do:
#define _USE_MATH_DEFINES
#include <math.h>
and receive the definitions of mathematical constants, even if <math.h>
has previously been included. To support this scenario, re-include
<math.h> every time the wrapper header is included.
Differential Revision: https://reviews.llvm.org/D42403
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@323490 91177308-0d34-0410-b5e6-96231b3b80d8
For std::isinf, the standard requires effectively calling isinf as
double from Libc for integral types. But integral types are never
infinite; we don't need to call Libc to return false.
Also short-circuit other functions where Libc won't have interesting
answers: signbit, fpclassify, isfinite, isnan, and isnormal.
I added correctness tests for integral types since we're no longer
deferring to Libc.
In review it was pointed out that in future revisions of the C++
standard we may add more types to std::is_arithmetic (e.g.,
std::is_fixed_point). I'll leave it to a future commit to hack this to
allow using math functions on those. We'll need to change things like
__libcpp_fpclassify anyway, so I'm not sure anything here would really
be future-proof.
https://reviews.llvm.org/D31561
rdar://problem/31361223
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@301060 91177308-0d34-0410-b5e6-96231b3b80d8
LLVM dropped support for Visual Studio versions older than 2015 quite
some time ago, so I consider it safe to drop libc++'s support for older
CRTs. The CRT in Visual Studio 2015 provides a lot of previously missing
functions, so targeting it requires less special casing.
Differential Revision: https://reviews.llvm.org/D31798
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@299743 91177308-0d34-0410-b5e6-96231b3b80d8
When building with MSVCRT, we need to manually provide the type
promoting overloads to allow the correct type deduced invocation for
signbit(Int) and fpclassify(int).
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@295559 91177308-0d34-0410-b5e6-96231b3b80d8
The previous changes missed the change to include/cmath. These changes
allow some of the rand.distribution tests to pass on Windows.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294957 91177308-0d34-0410-b5e6-96231b3b80d8
Pull in the math functions from ucrt 14+ after auditing the library. It
seems that they are now complete for C99 math. Fixes more windows
tests!
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294918 91177308-0d34-0410-b5e6-96231b3b80d8
