[sr #108092] AC_PROG_GREP can select /usr/xpg4/bin/grep under Solaris 9 but it doesn't support long lines

Update of sr #108092 (project autoconf):

                Priority:              5 - Normal => 1 - Later              
                  Status:                    None => Confirmed              

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Follow-up Comment #1:

We apologize for not getting back to you about this sooner.

AC_PROG_GREP does check for a grep that supports long lines (up to 10240 bytes
long) but if it can't find one, it takes whatever grep it *can* find that
supports -e.  So indeed it is not guaranteed to pick a grep that supports long
lines.

It's *supposed* to pick whichever of 'grep' or 'ggrep' supports longer lines,
but that logic might be buggy.

Since this is a long-standing issue and an ideal fix might be hairy, I am
deferring it to after the upcoming 2.70 release, but we will definitely think
about how we can do better - perhaps with improvements to AC_PROG_GREP itself,
as well as with better documentation.

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