From 3ca844bd94b25181d910b963942be04785b2de11 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Mon, 6 Apr 2026 01:00:32 +0300
Subject: [PATCH] meson: Use <version> header for C++ library version check
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The ciso646 header has been removed in C++20. Use the version header
instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
---
 meson.build | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/meson.build b/meson.build
index a6cfdd07..a411d171 100644
--- a/meson.build
+++ b/meson.build
@@ -118,10 +118,9 @@ cpp_arguments = [
     '-Wnon-virtual-dtor',
 ]
 
-# \todo Switch to `version` when moving to C++20 as `ciso646` has been removed in C++20.
-if cxx.has_header_symbol('ciso646', '_LIBCPP_VERSION')
+if cxx.has_header_symbol('version', '_LIBCPP_VERSION')
     cxx_stdlib = 'libc++'
-elif cxx.has_header_symbol('ciso646', '__GLIBCXX__')
+elif cxx.has_header_symbol('version', '__GLIBCXX__')
     cxx_stdlib = 'libstdc++'
 else
     error('C++ standard library cannot be detected')