What's the point of the AC_C_CHAR_UNSIGNED macro?
"If the C type `char' is unsigned, define `__CHAR_UNSIGNED__',
unless the C compiler predefines it."
This is what <limits.h> is for. If you want to know if char is
unsigned, try #if CHAR_MIN == 0. I would suggest at least mentioning
that option in the doc for AC_C_CHAR_UNSIGNED.
Though you might warn about things like #if '\300 > 0, because (a) I
think the preprocessor and compiler may have different char types, and
(b) in theory you might someday meet a compiler with 16-bit char.
--
Hallvard
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