On 03/09/2018 04:25 PM, Reuben Thomas wrote:
According to this Open Group reference page
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/resource.h.html
:

rlim_t: Unsigned integer type used for limit values.

rlim_t is signed on some non-POSIX platforms so the comparison is needed there. Sorry, don't recall which platforms offhand, but a quick Google search suggests that older  HP-UX is one such (this version was before the requirement in question was added to POSIX). See page 18 of:

https://community.hpe.com/hpeb/attachments/hpeb/itrc-151/23778/1/241970.pdf

How about compiling with -Wno-tautological-compare instead, at least for code derived from Gnulib? In my experience, -Wtautological-compare is more trouble than it's worth, for Gnulib code.


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