[8u60] Request for backport approval: 8069057 and 8072732

[Dean Long]

I would like to backport "8069057: Make sure configure is run by bash" 
and the followup fix "8072732: Regression in configure due to 
JDK-8069057" to 8u60.  Both are needed by the previously approved 
backport of "8064357: AARCH64: Top-level JDK changes".  Without it, JPRT 
fails when trying to use /bin/sh instead of /bin/bash.

Bugs:

https://bugs.openjdk.java.net/browse/JDK-8069057
https://bugs.openjdk.java.net/browse/JDK-8072732

Original review threads:

http://mail.openjdk.java.net/pipermail/build-dev/2015-January/014064.html
http://mail.openjdk.java.net/pipermail/build-dev/2015-February/014267.html

The jdk9 changesets are here:

http://hg.openjdk.java.net/jdk9/dev/rev/da879ffb91cc
http://hg.openjdk.java.net/jdk9/dev/rev/507654772146

Unfortunately, the patches do not import cleanly.  Here are the
modified patches:

diff -r d9ba714b6e7f -r 43ed2e8bd6ea common/autoconf/configure
--- a/common/autoconf/configure Mon Mar 09 14:20:35 2015 -0400
+++ b/common/autoconf/configure Mon Mar 09 20:29:10 2015 -0400
@@ -28,6 +28,9 @@
    exit 1
  fi

+# Force autoconf to use bash.
+export CONFIG_SHELL=$BASH
+
  CONFIGURE_COMMAND_LINE="$@"
  conf_script_dir=`dirname $0`

diff -r 43ed2e8bd6ea -r b5121ccd1458 common/autoconf/configure
--- a/common/autoconf/configure Mon Mar 09 20:29:10 2015 -0400
+++ b/common/autoconf/configure Mon Mar 09 20:30:23 2015 -0400
@@ -28,8 +28,9 @@
    exit 1
  fi

-# Force autoconf to use bash.
+# Force autoconf to use bash. This also means we must disable autoconf 
re-exec.
  export CONFIG_SHELL=$BASH
+export _as_can_reexec=no

  CONFIGURE_COMMAND_LINE="$@"
  conf_script_dir=`dirname $0`

Let me know if there are any concerns about
these backports.

thanks,

dl