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Re: c++0x and locale_t
- From: Brian Inglis <Brian dot Inglis at SystematicSw dot ab dot ca>
- To: cygwin at cygwin dot com
- Date: Sat, 1 Oct 2016 08:58:09 -0600
- Subject: Re: c++0x and locale_t
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- Reply-to: Brian dot Inglis at SystematicSw dot ab dot ca
On 2016-10-01 07:30, Ken Brown wrote:
I'm having an issue building icu, which boils down to the following
$ cat foo.cc
$ g++ -c --std=c++0x foo.cc
foo.cc:2:1: error: ‘locale_t’ does not name a type
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
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:
for a similar problem to yours, and the solution in standard C++; and:
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
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
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