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I noticed g_print was replacing non-ASCII but valid UTF-8 characters with question marks, while printf displayed them correctly, so I wrote a quick test. When I compile and run the code below on Arch Linux it prints:

Charset is 'ANSI_X3.4-1968' (not UTF)

My LANG environment variable is set to en_GB.UTF-8, consistent with /etc/locale, which is the standard way to configure the charset on a Linux desktop AFAIK, so shouldn't glib read it from that?

#include <glib.h>

int main()
{
    const char *charset = NULL;
    gboolean utf = g_get_charset(&charset);
    g_print("Charset is '%s' (%sUTF)\n", charset, utf ? "" : "not ");
    return 0;
}