Bug 85732

Sorry, wrong compiler included in post, here is the right one:

$ g++ --version
g++ (Ubuntu 6.4.0-17ubuntu1~16.04) 6.4.0 20180424
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

It works fine for me with any version of GCC, including 6.4.0

Testing 'moneypunct' Facet:
--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol     = 'R$'
Intl Currency Symbol     = 'BRL '
Natl Positive Sign       = ''
Intl Positive Sign       = ''
Natl Positive Format     = { sign, symbol, space, value }
Intl Positive Format     = { sign, symbol, space, value }
Natl Negative Sign       = '-'
Natl Negative Format     = { sign, symbol, space, value }
Intl Negative Sign       = '-'
Intl Negative Format     = { sign, symbol, space, value }
Natl Decimal Point       = ','
Intl Decimal Point       = ','
Natl Thousands Separator = '.'
Intl Thousands Separator = '.'
Natl Fractional Digits   = '2'
Intl Fractional Digits   = '2'
Natl Grouping Length [0] = 3 digits
Natl Grouping Length [1] = 3 digits
Intl Grouping Length [0] = 3 digits
Intl Grouping Length [1] = 3 digits

Are you sure something else didn't change on your system at the same time? The C++ library just parses the locale definition data on your system, that data comes from glibc not from GCC.

Oh I take it back, when I use -static I can reproduce the problem.

Reduced:

#include <iostream>
#include <locale>

using namespace std;

void test(std::locale loc)
{
  cout << "--> Setting locale '" << loc.name() << "'\n";
  const moneypunct<char, true> & l_facMoneyIntl = use_facet<moneypunct<char, true> >(loc);
  const moneypunct<char, false> & l_facMoneyNatl = use_facet<moneypunct<char, false> >(loc);
  cout << "Natl Currency Symbol     = '"; cout << l_facMoneyNatl.curr_symbol(); cout << "'" << "\n";
  cout << "Intl Currency Symbol     = '"; cout << l_facMoneyIntl.curr_symbol(); cout << "'" << "\n";
  cout << "\n";
}

int main(int argc, char** argv)
{
  locale global ("");
  // locale::global(global);
  test(locale(argc == 1 ? "pt_BR.utf8" : argv[1]));
  test(global);
  test(locale("C"));
}


Without -static this produces something like:

--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol     = 'R$'
Intl Currency Symbol     = 'BRL '

--> Setting locale 'LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=en_GB.UTF-8;LC_TIME=en_GB.UTF-8;LC_COLLATE=C;LC_MONETARY=en_GB.UTF-8;LC_MESSAGES=en_GB.UTF-8;LC_PAPER=en_GB.UTF-8;LC_NAME=en_GB.UTF-8;LC_ADDRESS=en_GB.UTF-8;LC_TELEPHONE=en_GB.UTF-8;LC_MEASUREMENT=en_GB.UTF-8;LC_IDENTIFICATION=en_GB.UTF-8'
Natl Currency Symbol     = '£'
Intl Currency Symbol     = 'GBP '

--> Setting locale 'C'
Natl Currency Symbol     = ''
Intl Currency Symbol     = ''

But with -static the fields are all blank:

--> Setting locale 'pt_BR.utf8'
Natl Currency Symbol     = ''
Intl Currency Symbol     = ''

--> Setting locale 'LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=en_GB.UTF-8;LC_TIME=en_GB.UTF-8;LC_COLLATE=C;LC_MONETARY=en_GB.UTF-8;LC_MESSAGES=en_GB.UTF-8;LC_PAPER=en_GB.UTF-8;LC_NAME=en_GB.UTF-8;LC_ADDRESS=en_GB.UTF-8;LC_TELEPHONE=en_GB.UTF-8;LC_MEASUREMENT=en_GB.UTF-8;LC_IDENTIFICATION=en_GB.UTF-8'
Natl Currency Symbol     = ''
Intl Currency Symbol     = ''

--> Setting locale 'C'
Natl Currency Symbol     = ''
Intl Currency Symbol     = ''


I can reproduce this with any version tested (back to 4.3.6).

Hi Johnathon,

Okay, thanks for confirming. I didn't realize it was such as old bug. You're right, I just recently switched over to using -static (got tired of the library mismatches with multiple gcc versions on my system).

Best, Tom

This isn't a libstdc++ bug, I get the same with a pure C program:

$ cat loc.c
#include <locale.h>
#include <langinfo.h>
#include <stdio.h>

int main()
{
  locale_t loc = newlocale(1 << LC_ALL, "en_US.UTF-8", 0);
  const char* ccurr = nl_langinfo_l(CURRENCY_SYMBOL, loc);
  printf("Currency symbol: %s\n", ccurr);
  return 0;
}
$ gcc -D_GNU_SOURCE loc.c
$ ./a.out
Currency symbol: $
$ gcc -D_GNU_SOURCE loc.c -static
$ ./a.out
Currency symbol: 

So this seems to be a glibc problem.

Hi Jonathan,

Thanks for really tracking that down. Looks like a really deep and subtle bug. I hope somebody knows where to look to fix it in the glibc code.

Best, Tom

I don't think we can do anything to fix this in libstdc++ so I've reported it to glibc:
https://sourceware.org/bugzilla/show_bug.cgi?id=23164

*** Bug 71641 has been marked as a duplicate of this bug. ***