tests: complete disassembler tests

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

meson.build

@@ -3,21 +3,26 @@ project('matar', 'cpp',
   license : 'GPLv3',
   default_options : ['warning_level=3',
                      'werror=true',
-                     'optimization=3'])
+                     'optimization=3',
+                     'cpp_std=c++20'])
 
 compiler = meson.get_compiler('cpp')
 
-if compiler.has_argument('-std=c++23')
+'''
+TODO: use <print> and <format> instead of libfmt once LLVM 17 is out
+
+if compiler.has_argument('-std=c++2c')
+  add_global_arguments('-std=c++2c', language: 'cpp')
+elif compiler.has_argument('-std=c++23')
   add_global_arguments('-std=c++23', language: 'cpp')
 elif compiler.has_argument('-std=c++2b')
   add_global_arguments('-std=c++2b', language: 'cpp')
+elif compiler.has_argument('-std=c++20')
+  add_global_arguments('-std=c++20', language: 'cpp')
 else
   error(compiler.get_id() + ' ' + compiler.version() + 'does not meet the compiler requirements')
 endif
 
-'''
-TODO: use <print> and <format> instead of libfmt once LLVM 17 is out
-
 if compiler.has_argument('-fexperimental-library')
   add_global_arguments('-fexperimental-library', language: 'cpp')
 else
@@ -31,4 +36,6 @@ subdir('include')
 subdir('src')
 subdir('apps')
 
-subdir('tests')
+if get_option('tests')
+  subdir('tests')
+endif