Gnulib module: iswblank
Portability problems fixed by Gnulib:
-D_GNU_SOURCE) on some platforms:
Portability problems not fixed by Gnulib:
wchar_t is a 16-bit type and
therefore cannot accommodate all Unicode characters.
However, the Gnulib function
c32isblank, provided by Gnulib module
c32isblank, operates on 32-bit wide characters and therefore does not
have this limitation.