[PATCH] D32778: [libcxx] [test] Conditionally workaround C1XX/EDG bugs

[Casey Carter via Phabricator via cfe-commits]

CaseyCarter created this revision.

Test support machinery changes needed to parse with EDG and compile with C1XX's /Za flag that disables MS extensions.

I try to make changes to `<optional>` and the `optional`/`variant` tests simultaneously in the MS STL and in libc++, which realistically requires that I keep the tests largely synchronized between libc++ and our internal test suite. As a first step toward automating that integration, I'd like to upstream this patch.

This change works around a couple of bugs:

1. EDG doesn't like explicit constexpr in a derived class. This program:

  struct Base {};
  
  struct Derived : Base {
      constexpr Derived() = default;
  };

triggers "error: defaulted default constructor cannot be constexpr."

2. C1XX with /Za has no idea which constructor needs to be valid for copy elision.

The change also conditionally disables parts of the msvc_stdlib_force_include.hpp header that conflict with external configuration when `_LIBCXX_IN_DEVCRT` is defined.


https://reviews.llvm.org/D32778

Files:
  test/support/archetypes.hpp
  test/support/archetypes.ipp
  test/support/msvc_stdlib_force_include.hpp
  test/support/test.workarounds/c1xx_broken_za_ctor_check.pass.cpp
  test/support/test_macros.h
  test/support/test_workarounds.h

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