commit 1ba4a0633833903a3429e87a4c72ffe738139dd4
author Raul Tambre <raul@tambre.ee> Mon Apr 15 21:51:20 2024 +0300
committer Brad King <brad.king@kitware.com> Tue Apr 16 15:34:57 2024 -0400
tree 048b823523dae406221d98a47a4d9255ad16adef
parent 2038f2c2b14b733a697d332fdaf357a1ea3167bb

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

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 @@
     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()