From: michals <noreply@...>
Date: 2022-06-12T21:49:52+00:00
Subject: [ruby-core:108864] [Ruby master Bug#18823] _Bool not defined for C++

Issue #18823 has been updated by michals (Michal Such��nek).


Apparently for MSVC to report the correct c++ version it needs the /Zc:__cplusplus flag.

I don't know where to inject this flag, though.

The other failure cases are probably really obsolete.


----------------------------------------
Bug #18823: _Bool  not defined for C++
https://bugs.ruby-lang.org/issues/18823#change-97945

* Author: michals (Michal Such��nek)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0dev (2022-06-12T17:35:26Z master 8158f05e72)
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
When a _Bool argument is added to rb_fd_select ruby cannot be compiled on

VisualStudio 2022
VisualStudio 2019

gcc-5
gcc-4.8

clang-5
clang-4
clang-3.9

c++98 (llvm 14)
c++2a (llvm 14)

which suggests that `if defined(HAVE_STDBOOL_H) && (__cplusplus >= 201103L)` in `include/ruby/internal/stdbool.h` may not be a great way to detect that C++ has bool, especially on Visual Studio.



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