Hi Waldemar,

there's an example of buildroot package that fails to build when using isalnum_l: http://autobuild.buildroot.net/results/b7ba1210d5aa184b133f0171da621d2b0083e...

AFAICS include/ctype.h defines the following chain of macros for it: isalnum_l -> __isalnum_l -> __isctype_l and __isctype_l tries to dereference __ctype_b field in the l parameter which is of incomplete type. The easiest fix for that seems to be not providing macro definitions for isalnum_l and friends. I also tried to follow the way it was intended to work with macros, but that seemed a bit too convoluted.

What do you think the fix could be?