Re: [patch, testsuite] check for UTF-32 target wide charset support in gdb.base/wchar.exp

[Doug Evans <xdje42@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:
>> From: Doug Evans <xdje42@gmail.com>
>> Cc: gdb-patches <gdb-patches@sourceware.org>
>> Date: Wed, 16 Sep 2015 21:30:46 -0700
>> 
>> #undef GDB_DEFAULT_HOST_CHARSET
>> #define GDB_DEFAULT_HOST_CHARSET "ISO-8859-1"
>> #define GDB_DEFAULT_TARGET_CHARSET "ISO-8859-1"
>> #define GDB_DEFAULT_TARGET_WIDE_CHARSET "ISO-8859-1" <<<<
>> 
>> How reasonable is it to enhance the PHONY_ICONV support so that
>> it handles this better?
>
> You mean, have functions like strlen and strcat handle 32-bit wchar_t
> strings?  Not reasonable.

Yikes. No, I didn't mean that. :-)
I meant have the PHONY_ICONV case use a better value for
GDB_DEFAULT_TARGET_WIDE_CHARSET.

>> I see it already tries to provide some minimal functionality:
>> 
>> static iconv_t
>> phony_iconv_open (const char *to, const char *from)
>> {
>>   /* We allow conversions from UTF-32BE, wchar_t, and the host charset.
>>      We allow conversions to wchar_t and the host charset.  */
>>   if (strcmp (from, "UTF-32BE") && strcmp (from, "wchar_t")
>>       && strcmp (from, GDB_DEFAULT_HOST_CHARSET))
>>     return -1;
>>   if (strcmp (to, "wchar_t") && strcmp (to, GDB_DEFAULT_HOST_CHARSET))
>>     return -1;
>> 
>>   /* Return 1 if we are converting from UTF-32BE, 0 otherwise.  This is
>>      used as a flag in calls to iconv.  */
>>   return !strcmp (from, "UTF-32BE");
>> }
>> 
>> I don't know, off hand, why big endian is supported and not little endian.
>
> Supported by whom?

By PHONY_ICONV.
[which is more of a minimal iconv than a phony iconv, but whatever]