[libcxx-commits] [PATCH] D58942: Make VCRuntime ABI configuration a first-class option.

[Eric Fiselier via Phabricator via libcxx-commits]

EricWF created this revision.
EricWF added reviewers: thomasanderson, ldionne, smeenai.
Herald added subscribers: libcxx-commits, jdoerfert.

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>`.


Repository:
  rCXX libc++

https://reviews.llvm.org/D58942

Files:
  include/__config
  include/exception
  include/new
  include/typeinfo
  src/new.cpp
  src/stdexcept.cpp
  src/support/runtime/exception_msvc.ipp
  src/typeinfo.cpp

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