8 Nov
2017
8 Nov
'17
2:36 p.m.
On Wed, Nov 08, 2017 at 12:48:47PM +0000, Tony Finch wrote:
Nelson H. F. Beebe <beebe(a)math.utah.edu> wrote:
whether char is signed or unsigned is defined by the ABI of the
platform, not by the compiler (if the compiler builder respects the
ABI, which is of course a wise thing to do).
-Otto
% cat *.log | grep '^ char type is' | sort | uniq -c
157 char type is signed
3 char type is unsigned
The sole outliers are
* Arch Linux ARM on armv7l
* IBM CentOS Linux release 7.4.1708 on PowerPC-8
* SGI IRIX 6.5 on MIPS R10000-SC
Nice survey, thanks!
I learned C using the Norcroft C compiler on early Acorn / ARM machines
where char was unsigned. That is still the case, though ARM have switched
from Norcroft to clang.