iconv: illegal input sequence

[Lokesh Janghel]

Hi,

I am working on the charset conversion from cp932 to utf8.
And got the following problem with gcc-8.3:
$ccppc -E test.cxx -finput-charset=cp932
cc1plus: error: conversion from cp932 to UTF-8 not supported by iconv

And I am facing error like "iconv: illegal input sequence at position 85"
When I try to convert with:
$iconv -f cp932 -t utf8 test.cxx

Can you help me with the issue if I am following the wrong step or
missing something?
Please let me know your thoughts on the problem.

Thanks and regards,
Lokesh Janghel
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#if 0
#include <vxWorks.h>
#include <stdio.h>
#endif

void test_sjis()
{
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}