From 1ba4a0633833903a3429e87a4c72ffe738139dd4 Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul@tambre.ee>
Date: Mon, 15 Apr 2024 21:51:20 +0300
Subject: GNU: Add flags for C++26 modes

Flags added in GCC commit `5388a43f6a3` (c++: Add support for
-std={c,gnu}++2{c,6}, 2023-06-22).
---
 Modules/Compiler/GNU.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index fa199b4..1113e9a 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -293,4 +293,9 @@ macro(__compiler_gnu_cxx_standards lang)
     set(CMAKE_${lang}20_STANDARD_COMPILE_OPTION "-std=c++2a")
     set(CMAKE_${lang}20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
   endif()
+
+  if(CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL 14.0)
+    set(CMAKE_${lang}26_STANDARD_COMPILE_OPTION "-std=c++26")
+    set(CMAKE_${lang}26_EXTENSION_COMPILE_OPTION "-std=gnu++26")
+  endif()
 endmacro()
-- 
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