commit fc72b6d7d818ab2868920af956d1542d03342a4d
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Aug 1 17:01:37 2023 +0200

    iconv: restore verbosity with unrecognized encoding names (bug 30694)
    
    Commit 91927b7c76 ("Rewrite iconv option parsing [BZ #19519]") changed the
    iconv program to call __gconv_open directly instead of the iconv_open
    wrapper, but the former does not set errno.  Update the caller to
    interpret the return codes like iconv_open does.

diff --git a/iconv/iconv_prog.c b/iconv/iconv_prog.c
index 08ea99d6adf6ea86..f199db6020284ad1 100644
--- a/iconv/iconv_prog.c
+++ b/iconv/iconv_prog.c
@@ -201,7 +201,7 @@ main (int argc, char *argv[])
 
       if (res != __GCONV_OK)
 	{
-	  if (errno == EINVAL)
+	  if (res == __GCONV_NOCONV || res == __GCONV_NODB)
 	    {
 	      /* Try to be nice with the user and tell her which of the
 		 two encoding names is wrong.  This is possible because