Re: new module 'iconv_open'

[Bruno Haible]

Simon Josefsson wrote:
> For example, in GnuTLS, I recently received a patch that added a
> configure-time warning about missing non-required tools:
> 
> AC_PATH_PROG([GAA], [gaa])
> if test "x$GAA" = "x"; then
>    AC_MSG_WARN([[***
> *** GAA was not found.  It is only needed if you wish to modify
> *** the source code or command-line description files.  In this case,
> *** you may want to get it from http://gaa.sourceforge.net/
> ***]])
> fi

Such a warning has the potential to confuse many tarball users, or have them
spend time to install tools that they won't need in the end.

Also, AC_PROG_YACC doesn't do this. It simply prints one line of output,
like most other autoconf tests.

Bruno