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    <p>Ok I don't have an answer for you, but I have some clues:</p> <ul> <li>This isn't limited to OS X 10.6. I get the same result on a 10.4 machine.</li> <li>I looked at the <a href="http://gcc.gnu.org/viewcvs/trunk/libstdc%2B%2B-v3" rel="noreferrer">GCC source for libstdc++</a> and hunted around for <code>_S_create_c_locale</code>. What I found is on line 143 of <a href="http://gcc.gnu.org/viewcvs/trunk/libstdc%2B%2B-v3/config/locale/generic/c_locale.cc?revision=98492&amp;view=markup" rel="noreferrer">config/locale/generic/c_locale.cc</a>. The comment there says "Currently, the generic model only supports the "C" locale." That's not promising. In fact if I do <code>LANG=C</code> the runtime error goes away, but <em>any</em> other value for <code>LANG</code> I try causes the same error, regardless of what arguments I give to the <code>locale</code> constructor. (I tried <code>locale::classic()</code>, "C", "", and the default). This is true as far back as <a href="http://gcc.gnu.org/viewcvs/tags/gcc_4_0_0_release/libstdc%2B%2B-v3/config/locale/generic/c_locale.cc?revision=98492&amp;view=markup" rel="noreferrer">GCC 4.0</a></li> <li>That same page has a reference to <a href="http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html" rel="noreferrer">libstdc++ mailing list discussion</a> on this topic. I don't know how fruitful it is: I only followed it a little way down, and it gets very technical very fast.</li> </ul> <p>None of this tells you why the default locale on 10.6 wouldn't work with <code>std::locale</code> but it does suggest a workaround, which is to set <code>LANG=C</code> before running the program.</p>
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    1. POstd::locale breakage on MacOS 10.6 with LANG=en_US.UTF-8
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    1. COThank you for the excellent gumshoe work. I already had a workaround I'm using, as described in the original question (setting `LANG=`). I can execute the workaround, but I'm still curious why the default configuration seems broken.
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    2. COSo the answer seems to be that libstdc++ just does not support locales other than "C" on Mac OS X. I tried the same test with libc++ instead and it does work. (however I notice that, while you can construct a locale that uses a non-UTF-8 encoding, the underlying xlocal support doesn't support actually converting to or from such locales. It seems that only UTF-8 and possibly other Unicode encodings are supported).
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