Re: Solaris -R check fails

[Akim Demaille]

| ChangeLog:
|         * acgeneral.m4 (_AC_LINK_IFELSE): Always create the test source.
|         Default to AC_LANG_PROGRAM() if the first argument is empty.
| 

This is not good.  The convention for AC_..._IFELSE is that if you
didn't pass a program to compile, you have created it, and you want
the macros to use it.  Then it's also your responsibility to remove it
(no longer AC_..._IFELSE's).

If you want an empty program, pass [ ], or [/* Nothing */].

Note that it probably means that AC_TRY_COMPILE etc. should be
revisited.