8 Nov
2017
8 Nov
'17
10:03 p.m.
On Wed, Nov 8, 2017 at 5:48 AM, Tony Finch <dot(a)dotat.at> wrote:
Nelson H. F. Beebe <beebe(a)math.utah.edu> wrote:
ARM's pre-EABI ABIs dictated that char be unsigned. It's all dictated by
the ABI that's implemented, and less about which compiler is used. Now that
EABI is basically mainstream, unsigned characters on ARM has become a
historic oddity.
Warner
% 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.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.
doc.dui0774h/kpr1493281322162.html
(And I started learning about unix from reading articles about RISC iX,
Acorn's 4.3BSD port to the Archimedes.)