[Bug c/67224] UTF-8 support for identifier names in GCC

[ejolson at unr dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67224

--- Comment #16 from Eric <ejolson at unr dot edu> ---
With my second patch the command line must now include the options

    -finput-charset=UTF-8 -fextended-identifiers -fexec-charset=UTF-8

or otherwise C99 will also be used for the default execution character set.  A
better approach to maintain nearly 8-bit clean string literals by default might
result from leaving the default input and execution characters sets as UTF-8
and setting the internal character set to C99 only when -fextended-identifiers
is selected.  Sorry for too many comments.  I'll post a new patch when
everything is ready and has been tested.