What are the "serious" libraries?

[Joe Nelson]

I wrote:
> So all I can conclude is that if __STDC_ISO_10646__ is not defined,
> then there is a Unicode character which is stored in wchar_t using a
> different numerical value than its codepoint. Why would that be, does
> anyone have insight into this?

Trying to get to the bottom of the mystery. Thought perhaps Mac stores
UTF-16 rather than UTF-32 in wchar_t, but the following program
disproves that hypothesis. Really wondering why Mac doesn't conform to
ISO 10646.
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#include <locale.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
	/* U+1F41A, outside the BMP */
	char    *seashell_utf8 = "\xf0\x9f\x90\x9a";
	wchar_t *seashell_wide = malloc(5 * sizeof(wchar_t));

	if (!setlocale(LC_CTYPE, "en_US.UTF-8"))
	{
		fputs("Cannot set locale\n", stderr);
		return EXIT_FAILURE;
	}

	if ((size_t)(-1) ==
		mbstowcs(seashell_wide, seashell_utf8, sizeof(seashell_wide)-1))
	{
		fputs("Invalid multibyte character\n", stderr);
		return EXIT_FAILURE;
	}

	while (*seashell_wide)
		printf("%x ", *seashell_wide++);
	puts("");
	return EXIT_SUCCESS;
}