make sure this actually uses clang fully

meson.build

@@ -23,9 +23,11 @@ common_cpp_args = [
   '-Wno-unsafe-buffer-usage',
   '-Wunused-function',
   '-fvisibility=hidden',
+  '-stdlib=libc++'
 ]
 
 add_project_arguments(cpp.get_supported_arguments(common_cpp_args), language: 'cpp')
+add_project_arguments('-stdlib=libc++', language: 'cpp')
 
 source_file_names = [
   'src/main.cpp',

src/main.cpp

@@ -1,5 +1,4 @@
 #include <cstdlib>
-#include <fmt/base.h>
 #include <fmt/format.h>
 #include <iostream>