-finput-charset internal error

[杨继超]

Hi, all.
I have a internal error while compiling the follow soure code with command:
gcc gbk.c -finput-charset=gbk -fexec-charset=utf-16 -o gbk

#include <wchar.h>
#include <stdio.h>
void output_hex(const char *p, int len);

int main()
{
    const char c_test[] = "I爱你";
    const wchar_t wc_test[] = L"I爱你";
    output_hex(c_test, sizeof(c_test));
    output_hex((const char*)wc_test, sizeof(wc_test));
}

void output_hex(const char* p, int len)
{
    int i;
    for ( i = 0; i < len; i++) {
        unsigned char ch = (unsigned char)p[i];
        printf("%02X ", ch);
    }
    printf("\n");
}

The error message is
jcyangzh@debian:~/src/
encoding/compiler$ gcc -finput-charset=gbk gbk.c -fexec-charset=utf-16
gbk.c:10:1: internal error: character 0xa is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x25 is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x63 is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x73 is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0xa is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x25 is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x63 is not unibyte in execution
character set
gbk.c:10:1: internal error: character 0x73 is not unibyte in execution
character set

The encoding of source file is gbk.But when i set the fexec-charset to
utf-8, the compiler works well.

Thanks.