Add missing GCC version to settings.yml
This version is already apt package, g++-10, in Ubuntu 20.04.
@@ -64,7 +64,8 @@ _t_default_settings_yml = Template(textwrap.dedent("""
"6", "6.1", "6.2", "6.3", "6.4",
"7", "7.1", "7.2", "7.3", "7.4",
"8", "8.1", "8.2", "8.3",
- "9", "9.1", "9.2", "9.3"]
+ "9", "9.1", "9.2", "9.3",
+ "10"]
libcxx: [libstdc++, libstdc++11]
threads: [None, posix, win32] # Windows MinGW
exception: [None, dwarf2, sjlj, seh] # Windows MinGW
