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Date: Mon, 30 Nov 2020 08:39:18 -0600
From: Samuel Holland <samuel@...lland.org>
To: musl@...ts.openwall.com, Érico Nogueira
<ericonr@...root.org>, Dong Brett <brett.browning.dong@...il.com>
Subject: Re: Question on C++ locale
On 11/30/20 7:44 AM, Érico Nogueira wrote:
> On Mon Nov 30, 2020 at 8:35 AM -03, Szabolcs Nagy wrote:
>> * Dong Brett <brett.browning.dong@...il.com> [2020-11-30 18:41:33
>> +0800]:
>>> However, the following C++ code does not work (our software uses std::locale in C++ standard library for locale related stuff):
>>> #include <langinfo.h>
>>> #include <locale.h>
>>> #include <locale>
>>> using namespace std;
>>> int main()
>>> {
>>> std::locale::global(locale(""));
>>> initscr();
>>> printw("LC_ALL: %s\n", setlocale(LC_ALL, NULL));
>>> printw("C++ locale: %s\n", locale().name().c_str());
>>> printw("CODESET: %s\n", nl_langinfo(CODESET));
>>> printw("Hello, world!\n");
>>> printw("你好，世界!\n");
>>> refresh();
>>> getch();
>>> endwin();
>>> return 0;
>>> }
>>
>> fwiw for me even the first line fails.
>> i don't know how c++ locales are supposed to work.
>
> From [1], it seems that C++ locales are supposed to affect the global
> locale as well, so they should call setlocale() when appropriate.
>
> - [1] https://www.cplusplus.com/reference/locale/locale/
>
> Unfortunately, I assume libstdc++ uses their generic locale support on
> musl... From gcc-10.2.0/libstdc++-v3/config/locale/generic/c_locale.cc:
>
> void
> locale::facet::_S_create_c_locale(__c_locale& __cloc, const char* __s,
> __c_locale)
> {
> // Currently, the generic model only supports the "C" locale.
> // See http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html
> __cloc = 0;
> if (strcmp(__s, "C"))
> __throw_runtime_error(__N("locale::facet::_S_create_c_locale "
> "name not valid"));
> }
>
I don't know for sure that it's the right thing to do, but I have been patching
out that error for the last several years[1] and so far I have not noticed any
negative effects. Adelie, which is very thorough about testing, has also carried
the patch for a while[2].
Samuel
[1]:
https://github.com/smaeul/portage/blob/c744774a/patches/sys-devel/gcc/gcc-5.4.0-locale.patch
[2]: https://code.foxkit.us/adelie/packages/-/commit/d09b437d
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