[all-commits] [llvm/llvm-project] 3fc0d9: [libc++][test] Make macro detection more friendly ...

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fc0d94ce57de2d0841e77c8fda7feef2923c4e0
      https://github.com/llvm/llvm-project/commit/3fc0d94ce57de2d0841e77c8fda7feef2923c4e0
  Author: A. Jiang <de34 at live.cn>
  Date:   2024-10-26 (Sat, 26 Oct 2024)

  Changed paths:
    M libcxx/test/support/test_macros.h

  Log Message:
  -----------
  [libc++][test] Make macro detection more friendly to MSVC (#113633)

MSVC STL's test suite is a bit nervous about replacing non-macro-defined
identifiers with `0` (see also
https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-4-c4668?view=msvc-170).

On MSVC (and MS-compatible mode of other compilers), `long double` has
the same format (IEEE-754 binary64) as `double`, so it should be OK to
define `TEST_LONG_DOUBLE_IS_DOUBLE` when `_MSC_VER` is defined. Such
detection should be performed first.



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