tree 235e28c224daed4c5e908cdc19cc0424a4f2cdf5
parent 7f3087ed7c0e3b194eab268765190c0996f6aff0
author Eric Fiselier <eric@efcs.ca> 1551751021 +0000
committer Eric Fiselier <eric@efcs.ca> 1551751021 +0000

Make VCRuntime ABI configuration a first-class option.

Summary:
On Windows we currently provide two separate ABI configurations. One which defers to `vcruntime` to provide the C++ runtime and another which doesn't.
Using `vcruntime` allows interoperability which programs compiled against the MSVC STL, and should be preferred whenever possible.

When deferring to `vcruntime` much of the ABI we provide changes. Including the layout of `<stdexcept>` types, their vtables, and how the linkage of their members.

This patch introduces the `_LIBCPP_ABI_VCRUNTIME` macro to denote this configuration. It also cleans up the existing configuration for using `vcruntime`.

This cleanup lays the groundwork for fixing a number of ABI and interoperability bugs in  `<stdexcept>`.


Reviewers: thomasanderson, ldionne, smeenai

Reviewed By: smeenai

Subscribers: jdoerfert, libcxx-commits, #libc

Differential Revision: https://reviews.llvm.org/D58942

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@355366 91177308-0d34-0410-b5e6-96231b3b80d8