git: adc3c128c660 - main - src.opts.mk: Require C++20 for C++ support.

The branch main has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=adc3c128c6603054586a993d117e5dd808deac17

commit adc3c128c6603054586a993d117e5dd808deac17
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2022-11-19 04:12:28 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2022-11-19 04:12:28 +0000

    src.opts.mk: Require C++20 for C++ support.
    
    libc++ requires C++20, so mark C++ (MK_CXX) as broken if the compiler
    does not support C++20.
    
    Reviewed by:    emaste
    Differential Revision:  https://reviews.freebsd.org/D36893
---
 share/mk/src.opts.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
index f69208f21556..5089a034350d 100644
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -348,6 +348,11 @@ __DEFAULT_YES_OPTIONS+=OPENMP
 __DEFAULT_NO_OPTIONS+=OPENMP
 .endif
 
+# libc++ requires C++20
+.if !${COMPILER_FEATURES:Mc++20}
+BROKEN_OPTIONS+=CXX
+.endif
+
 .include <bsd.mkopt.mk>
 
 #