autoconf tests for iconv fail with undefined refs

[Lemures Lemniscati]

On Sat, 19 Feb 2022 10:11:06 -0700, Brian Inglis
> On 2022-02-18 22:26, Lemures Lemniscati wrote:
> > On Fri, 18 Feb 2022 12:33:30 -0700, Brian Inglis
> >> Any idea why autoconf tests for iconv now fail with undefined refs to iconv{_open,,_close}! STC attached, log, -E output. Tried also with -l iconv.
> 
> > https://cygwin.com/cgi-bin2/jobs.cgi?srcpkg=playground&id=3861
> > This will successfully build libisocodes-1.2.4 but some tests fail.
> 
> Thanks Lem,
> 
> Not so worried about that, just noticed that iconv conftest also failed in my recent findutils build which I released, missing libiconv functions and presumably substituting gnulib functions, although the iconv conftest passed in github scallywag.
> This may be the result of a change in gnulib or autoconf, which now sometimes fails when it should not.

Although `gcc iconv-test.c -liconv` should pass, it might have been used
for test, a command like either `gcc -liconv iconv-test.c`,
or `gcc iconv-test.c`.

Lem