Re: [PATCH v4] grep: fix multibyte regex handling under macOS

Diomidis Spinellis [off-list ref] writes:

quoted

Perhaps cook this in 'next' and see if anybody screams?

Let's do this.

I was programming in C before locale.h was introduced, so its
availability was something that worried me as well.  I looked up
whether we could/should use a GNU autoconf macro to test for the
locale.h availability.  According to autoconf's documentation "All
hosted environments that are still of interest for portable code
provide all of the headers specified in ISO C90 (as amended in 1995):
assert.h, [...] locale.h [...], and wctype.h. Most programs can safely
include these headers unconditionally." [1]

Yeah, but there are folks on minor platforms where full POSIX
compliance is iffy, so whatever autoconf's documentation says
unfortunately does not weigh as much as we wish it does.