https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114101
--- Comment #13 from dave.anglin at bell dot net --- With the patch, we now have: name7161.cc:5: error: #error '__cpp_lib_text_encoding' is false compiler exited with status 1 UNSUPPORTED: std/text_encoding/cons.cc -std=gnu++26 UNSUPPORTED: std/text_encoding/members.cc -std=gnu++26 name7161.cc:5: error: #error '__cpp_lib_text_encoding' is false compiler exited with status 1 UNSUPPORTED: std/text_encoding/requirements.cc -std=gnu++26 The FAILs are gone.