ruby-core

Issue #18616 has been updated by shyouhei (Shyouhei Urabe).


Thank you for reporting!  Are you using the compiler that nginx detects here?  If you use one that the ruby's build system finds, then it should have added `-fdeclspec` into `CFLAGS` for you.

https://github.com/ruby/ruby/blob/cd9a9bdfc57bd5e3f5378345720e3c6aa45fdc3d/configure.ac#L614

Maybe you want to do the same thing.

----------------------------------------
Bug #18616: Warning with clang(1) on MacOS due to __declspec()
https://bugs.ruby-lang.org/issues/18616#change-96727

* Author: alx (Alejandro Colomar)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Issue originally reported in Nginx Unit <https://github.com/nginx/unit/issues/653>.

Apple version of `clang`(1) behaves different than what we have in Debian
(and presumably other Linux systems).
It reports `1` for `__has_declspec_attribute(noreturn)` (in Debian it evaluates to `0`),
without specifying `-fdeclspec`,
but then ruby triggers a build error due to not having specified `-fdeclspec`.

Not sure if that's a ruby bug or a clang bug.

```c
$ cat ruby.c
#include <ruby.h>

int main(void)
{
	printf("RBIMPL_COMPILER_IS_MSVC: %i\n", RBIMPL_COMPILER_IS_MSVC);
	return 0;
}
```
```sh
$ cc -I /usr/local/opt/ruby/include/ruby-3.1.0/ -I /usr/local/opt/ruby/include/ruby-3.1.0/x86_64-darwin20/ -fdeclspec ruby.c
```
```sh
$ cc -I /usr/local/opt/ruby/include/ruby-3.1.0/ -I /usr/local/opt/ruby/include/ruby-3.1.0/x86_64-darwin20/ ruby.c
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:25:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/defines.h:73:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/backward/2/attributes.h:42:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/pure.h:25:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/assert.h:132:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:26:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/anyargs.h:77:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/intern/vm.h:383:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/int.h:26:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/long.h:70:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:28:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:63:14: error: expected parameter declarator
RUBY_ALIGNAS(SIZEOF_VALUE)
             ^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value.h:106:23: note: expanded from macro 'SIZEOF_VALUE'
# define SIZEOF_VALUE SIZEOF_LONG
                      ^
/usr/local/opt/ruby/include/ruby-3.1.0/x86_64-darwin20/ruby/config.h:66:21: note: expanded from macro 'SIZEOF_LONG'
#define SIZEOF_LONG 8
                    ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:28:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:63:14: error: expected ')'
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value.h:106:23: note: expanded from macro 'SIZEOF_VALUE'
# define SIZEOF_VALUE SIZEOF_LONG
                      ^
/usr/local/opt/ruby/include/ruby-3.1.0/x86_64-darwin20/ruby/config.h:66:21: note: expanded from macro 'SIZEOF_LONG'
#define SIZEOF_LONG 8
                    ^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:63:1: note: to match this '('
RUBY_ALIGNAS(SIZEOF_VALUE)
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/backward/2/stdalign.h:27:22: note: expanded from macro 'RUBY_ALIGNAS'
#define RUBY_ALIGNAS RBIMPL_ALIGNAS /**< @copydoc RBIMPL_ALIGNAS */
                     ^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/stdalign.h:66:44: note: expanded from macro 'RBIMPL_ALIGNAS'
# define RBIMPL_ALIGNAS(_) __declspec(align(_))
                                           ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:28:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:64:1: error: expected function body after function declarator
RBasic {
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:155:23: error: incomplete definition of type 'struct RBasic'
    return RBASIC(obj)->klass;
           ~~~~~~~~~~~^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:155:12: note: forward declaration of 'struct RBasic'
    return RBASIC(obj)->klass;
           ^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rbasic.h:40:57: note: expanded from macro 'RBASIC'
#define RBASIC(obj)                 RBIMPL_CAST((struct RBasic *)(obj))
                                                        ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:86:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:103:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:118:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:139:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:151:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:176:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:187:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:204:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:216:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:236:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:248:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
In file included from ruby.c:1:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/ruby.h:27:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic.h:23:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/arithmetic/char.h:29:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/core/rstring.h:30:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/fl_type.h:38:
In file included from /usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/value_type.h:33:
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/error.h:287:1: error: '__declspec' attributes are not enabled; use '-fdeclspec' or '-fms-extensions' to enable support for __declspec attributes
RBIMPL_ATTR_NORETURN()
^
/usr/local/opt/ruby/include/ruby-3.1.0/ruby/internal/attr/noreturn.h:29:33: note: expanded from macro 'RBIMPL_ATTR_NORETURN'
# define RBIMPL_ATTR_NORETURN() __declspec(noreturn)
                                ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
```
```sh
$ cc --version
Apple clang version 13.0.0 (clang-1300.0.29.30)
Target: x86_64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
```



-- 
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