I'm seeing failures from build-many-glibcs.py for 
resource/check-obsolete-constructs:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 3198: ordinal not in range(128)

This is with LC_ALL=C (and bits/resource.h headers containing UTF-8 µ in a 
comment).  Code opening text files that might not be pure ASCII needs to 
specify an encoding explicitly to avoid depending on the locale tests are 
run with.  There is also a case that the encoding specified should be 
ASCII - that installed headers should be required to be pure ASCII so they 
can be included in source files with any ASCII-compatible character set if 
compiling with -finput-charset= (which affects included headers as well as 
the main source file, so compiling "#include <sys/resource.h>" with 
-finput-charset=ascii currently fails).

-- 
Joseph S. Myers
joseph@codesourcery.com