[SCM] GNU Autoconf source repository branch, master, updated. v2.68b-3-gcca288d

[Stefano Lattarini]

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- Log -----------------------------------------------------------------
commit cca288d94e1d1992dd157e43c5891213c87b46be
Author: Stefano Lattarini <address@hidden>
Date:   Sat Mar 3 10:44:25 2012 +0100

    configure: don't infloop when re-executing with $CONFIG_SHELL
    
    It turns out our guard against infinite recursion wasn't good
    enough when shells without $LINENO support were involved, since
    the creation-and-sourcing of configure.lineno broke the guard's
    expectations.  Reports by Tim Rice and Paul Eggert.
    
    * lib/m4sugar/m4sh.m4 (_AS_LINENO_PREPARE): Export '_as_can_reexec'
    to "no" before sourcing the just-created configure.lineno.

-----------------------------------------------------------------------

Summary of changes:
 lib/m4sugar/m4sh.m4 |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index be013aa..f05346b 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -1199,6 +1199,10 @@ dnl Eggert wrote the scripts with optimization help from 
Paolo Bonzini).
   chmod +x "$as_me.lineno"] ||
     AS_ERROR([cannot create $as_me.lineno; rerun with a POSIX shell])
 
+  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
+  # already done that, so ensure we don't try to do so again and fall
+  # in an infinite loop.  This has already happened in practice.
+  _as_can_reexec=no; export _as_can_reexec
   # Don't try to exec as it changes $[0], causing all sort of problems
   # (the dirname of $[0] is not the place where we might find the
   # original and so on.  Autoconf is especially sensitive to this).


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