Re: u8_strconv_to_locale() misbehaves on OSX (Travis CI runner)

[Bruno Haible <bruno@clisp.org>]

Hi Tim,

> locale_charset() returns with "UTF-8".

That is as it should be on Mac OS X.

> u8_strconv_to_locale() and u8_strconv_from_locale() seem not to work as
> expected:
> 
> 
> One problem seems to be that u8_strconv_to_locale() outputs decomposed
> characters, e.g. u8_strconv_to_locale(bücher.de) returns b"ucher.de.
> 
> Hex/u32:
> 
> Result: U+0062 U+0022 U+0075 U+0063 U+0068 U+0065 U+0072 U+002e U+0064
> U+0065)
> 
> Expected: U+0062 U+00fc U+0063 U+0068 U+0065 U+0072 U+002e U+0064 U+0065

This would indicate that locale_charset() returns "ASCII".
What happens then is that, because u8_strconv_to_locale invokes
u8_strconv_to_encoding, which invokes mem_iconveha with transliterate=true,
which appends '//TRANSLIT' when invoking iconv_open. you get the
transliteration, e.g. from 'ü' to '"u'.

> The second problem is that characters beyond 255 are translated into ?
> (U+003f).

This would indicate that locale_charset() returns "ISO-8859-1". The
question marks then come from the transliteration, again.

> Do you have any hints how to fix these problems ?

I would compile without -O and with -ggdb, then single-step through the code,
paying particular attention to the value of locale_charset() and to
the arguments of iconv_open().

> I would expect u8_strconv_to_locale() to work in a defined manner on
> UTF-8 locales

That's certainly how it is intended to be.

Bruno