On Mon, 13 Feb 2023, Paul Zimmermann wrote:
Hi,
someone reported to me the following issue:
Microsoft (R) C/C++ Optimizing Compiler Version 19.34.31937 for x64
will not compile line 2230 in gmp.h:
*__gmp_rp = (- *__gmp_up) & GMP_NUMB_MASK;
giving error C4146: unary minus operator applied to unsigned type,
result still unsigned.
Just in case this warning can be avoided.
It has been doing that for a long time, for instance
https://gmplib.org/list-archives/gmp-discuss/2004-September/001332.html
and with some options (like /sdl ?) it is turned into an error. It may be
that /external:someoption helps disable it without disabling warnings for
the user's code.
It is certainly possible to avoid the warning, either with a pragma or
with different code, but until now, the policy has been to tell people to
disable this non-sensical behavior in visual studio or use a better
compiler. I don't have a strong opinion here.
--
Marc Glisse
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