tree f5aedbcdeb1dae262cec3fba2768ea93e0b91edf
parent 30a22af8361c957dd8d80b3b56ea0c05180ffcfb
author Eric Fiselier <eric@efcs.ca> 1551904317 +0000
committer Eric Fiselier <eric@efcs.ca> 1551904317 +0000

Fix ABI compatibility of `<stdexcept>` with VCRuntime.

Summary:
Currently, libc++'s `<stdexcept>` doesn't play nice with `vcruntime`. Specifically:

* `logic_error` and `runtime_error` have a different layout.
* libc++'s `logic_error` and `runtime_error` override `what()` but `vcruntime` does not.
*  `vcruntime` uses weak vtables for `<stdexcept>` types.
* libc++'s `<stdexcept>` constructors and assignment operators may have different manglings than `vcruntimes`.

This patch makes libc++'s declarations in `<stdexcept>` match those provided by MSVC's STL as closely as possible.
If MSVC doesn't declare a special member, then neither do we. This ensures that the implicit definitions have the same linkage, visibility, triviality, and noexcept-ness.


Reviewers: thomasanderson, ldionne, smeenai

Reviewed By: thomasanderson

Subscribers: jdoerfert, libcxx-commits

Differential Revision: https://reviews.llvm.org/D58945

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@355546 91177308-0d34-0410-b5e6-96231b3b80d8