Require a modern version of flex to make a dist tarball so that it

generates Windows-friendly *_lex.c files.  Update HACKING to match.

Also need r22467 in the CMRs to fix how the pcie btl compiles and
distributes its .l file.

cmr:v1.4
cmr:v1.5

This commit was SVN r22468.

The following SVN revision numbers were found above:
  r22467 --> open-mpi/ompi@1a7b7f7180

HACKING

@@ -8,7 +8,7 @@ Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
                         University of Stuttgart.  All rights reserved.
 Copyright (c) 2004-2005 The Regents of the University of California.
                         All rights reserved.
-Copyright (c) 2008      Cisco Systems, Inc.  All rights reserved.
+Copyright (c) 2008-2010 Cisco Systems, Inc.  All rights reserved.
 $COPYRIGHT$
 
 Additional copyrights may follow
@@ -256,11 +256,18 @@ supported: given the choice of making parsing code portable between
 all flavors of lex and doing more interesting work on Open MPI, we
 greatly prefer the latter.  
 
-Several developers use the stable flex version v2.5.4a from July of
+Several POSIXly-oriented developers use the stable flex version
-1997.  Others have upgraded to more recent versions; these also seem
+v2.5.4a from July of 1997.  Others have upgraded to more recent
-to work fine.  Note that no testing has been performed to see what the
+versions; these also seem to work fine.  Note that no testing has been
-minimum version of Flex is required by Open MPI.  We suggest that you
+performed to see what the minimum version of Flex is required by Open
-use v2.5.4a at the earliest.
+MPI.  We suggest that you use v2.5.4a at the earliest.
+
+*** NOTE: Windows builds of Open MPI require Flex version 2.5.35.
+Specifically, we know that v2.5.35 works and 2.5.4a does not.  We have
+not tested to figure out exactly what the minimum required flex
+version is on Windows; we suggest that you use 2.5.35 at the earliest.
+It is for this reason that the contrib/dist/make_dist_tarball script
+checks for a Windows-friendly version of flex before continuing.
 
 Note that the flex-generated code generates some compiler warnings on
 some platforms, but the warnings do not seem to be consistent or

contrib/dist/make_dist_tarball

@@ -26,6 +26,7 @@ M4_TARGET_VERSION=1.4.13
 AM_TARGET_VERSION=1.11
 AC_TARGET_VERSION=2.65
 LT_TARGET_VERSION=2.2.6b
+FLEX_TARGET_VERSION=2.5.35
 
 #
 # Check command line flags
@@ -66,6 +67,7 @@ check_gnu_version() {
     target="$2"
 
     ver="`$prog --version | head -n 1 | sed -e's/([^)]*)//g' -e's/[^0-9 .][^ ]* / /g' -e's/ //g'`"
+    echo $prog version is $ver
 
     ver_major=`echo $ver | cut -d. -f1`
     ver_minor=`echo $ver | cut -d. -f2`
@@ -122,6 +124,7 @@ m4: $M4_TARGET_VERSION
 Automake: $AM_TARGET_VERSION
 Autoconf: $AC_TARGET_VERSION
 Libtool:  $LT_TARGET_VERSION
+Flex:     $FLEX_TARGET_VERSION
 
 Either change this script to match the found version, or install
 the correct version of the tools.
@@ -142,6 +145,7 @@ m4: $M4_TARGET_VERSION
 Automake: $AM_TARGET_VERSION
 Autoconf: $AC_TARGET_VERSION
 Libtool:  $LT_TARGET_VERSION
+Flex:     $FLEX_TARGET_VERSION
 
 Either change this script to match the found version, or install
 the correct version of the tools.
@@ -160,6 +164,7 @@ m4: $M4_TARGET_VERSION
 Automake: $AM_TARGET_VERSION
 Autoconf: $AC_TARGET_VERSION
 Libtool:  $LT_TARGET_VERSION
+Flex:     $FLEX_TARGET_VERSION
 
 This is *usually* ok, but this script is going to sleep for 5 seconds
 to give you the chance to quit before doing anything.
@@ -180,6 +185,7 @@ m4: $M4_TARGET_VERSION
 Automake: $AM_TARGET_VERSION
 Autoconf: $AC_TARGET_VERSION
 Libtool:  $LT_TARGET_VERSION
+Flex:     $FLEX_TARGET_VERSION
 
 Either change this script to match the found version, or install
 the correct version of the tools.
@@ -221,6 +227,15 @@ make_tarball() {
         exit 1
     fi
 
+    #
+    # Remove all generated *_lex.c files so that we ensure to invoke
+    # flex from here in this script (to ensure that we're using a good
+    # version of flex, and not picking up random *_lex.c files that
+    # happened to be in the tree already).
+    #
+    echo "*** Removing old generated flex files..."
+    find . -name \*_lex.c -exec rm -f {} \; -print
+
     #
     # make tarball
     #
@@ -249,11 +264,14 @@ make_tarball() {
 # main
 #########################################################################
 
-echo "*** Checking GNU tools versions..."
+echo "*** Checking tools versions..."
 check_gnu_version m4 $M4_TARGET_VERSION
 check_gnu_version automake $AM_TARGET_VERSION
 check_gnu_version autoconf $AC_TARGET_VERSION
 check_gnu_version libtool $LT_TARGET_VERSION
+# Windows needs a recent version of flex; old versions don't generate
+# Windows-friendly *_lex.c files.
+check_gnu_version flex $FLEX_TARGET_VERSION
 
 #
 # Verify that we're in a top Open MPI dir