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Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject: Re: c++0x and locale_t
References: <af127659-63ef-96ba-60f9-3bf17f70e6c1 AT cornell DOT edu>
To: cygwin AT cygwin DOT com
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Message-ID: <d62d5b0c-3702-62f5-f1c9-d470404fae94@SystematicSw.ab.ca>
Date: Sat, 1 Oct 2016 08:58:09 -0600
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On 2016-10-01 07:30, Ken Brown wrote:
> I'm having an issue building icu, which boils down to the following
> test case:
> $ cat foo.cc
> #include <locale.h>
> locale_t foo;
> $ g++ -c --std=c++0x foo.cc
> foo.cc:2:1: error: ‘locale_t’ does not name a type
>  locale_t foo;
>  ^
> If I remove '--std=c++0x', the error goes away.  I know nothing about
> C++ standards, so I don't know if this is expected behavior or if it
> indicates a bug in Cygwin's headers.

For C POSIX locale_t support, you have to do one or both of:

#define _XOPEN_SOURCE   700
#define _POSIX_C_SOURCE 200809L

to support multiple dynamic C locales and related functions.
This may be done automatically if you use the default -std=gnu++03, which may
have been the intent in ICU and original interpretation by g++.
g++ now interprets (and deprecates) c++0x to mean c++11.
You could try changing it to explicitly c++03 and see if it works, without the
GNU extensions.
Otherwise you should change it to explicitly gnu++03, as c++0x is deprecated,
and may be dropped; g++ also deprecates c++1y aka c++14 and c++1z which may be
c++17, and their gnu++ counterparts.

I don't understand why ICU C++ would use C locales, when C is now trying to add
a subset of features C++ has supported better, more flexibly in <locale> for
over a decade; see:

https://sourceforge.net/p/msys2/discussion/general/thread/23e1b5ce/

for a similar problem to yours, and the solution in standard C++; and:

http://stdcxx.apache.org/doc/stdlibug/24-3.html

for an explanation of the differences between C++ and C locales.

OTOH ICU comes from IBM, and may be more interested in consistency across
languages: how else can you explain C++ methods called createInstance?

But you may just be the packager, porter, and builder, so may be unable to fix
the implementation.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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