wip: Build: Use C++20

murraycu · murraycu · commit 2815cb3cea99 · 2019-10-27T14:57:31.000+01:00
This currently reqires the c++20 branch of mm-common.
diff --git a/configure.ac b/configure.ac
@@ -37,7 +37,7 @@ MM_INIT_MODULE([sigc++-3.0])
 MM_CONFIG_DOCTOOL_DIR([docs/docs])
 
 AC_PROG_CXX
-MM_AX_CXX_COMPILE_STDCXX([17],[noext],[mandatory])
+MM_AX_CXX_COMPILE_STDCXX([20],[noext],[mandatory])
 
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])
