#!/bin/bash

# Date: April 2, 2014

# by Aldy Hernandez

# Attempt to fix any "-m elf64ppc" linker checks in configure and

# libtool.m4 files.

#

# This script is meant to run silently as part of rpm's %configure

# macro.  It either fixes the problem, or we silently ignore it, in

# which case it is up to the package maintainer to add support for

# ppc64le.

# Our two attempts at fixing the problem.

PATCH1=/tmp/$$.patch1

PATCH2=/tmp/$$.patch2

cleanup() {

    rm -f $PATCH1 $PATCH2

}

trap cleanup 0 1 2 3 4 5 6 7 8 9 11 13 14 15

# There are two variants in RHEL7 so far.  The first version, handled

# with $PATCH1, currently handles all but 3 packages.  The $PATCH2

# version handles the remnant.

#

cat > $PATCH1 <

--- configure.orig	2014-03-18 15:56:15.575070238 -0500

+++ configure	2014-03-18 16:05:50.877861163 -0500

@@ -7714,6 +7714,9 @@

 	  x86_64-*linux*)

 	    LD="\${LD-ld} -m elf_i386"

 	    ;;

+	  ppc64le-*linux*|powerpc64le-*linux*)

+	    LD="\${LD-ld} -m elf32lppclinux"

+	    ;;

 	  ppc64-*linux*|powerpc64-*linux*)

 	    LD="\${LD-ld} -m elf32ppclinux"

 	    ;;

@@ -7733,6 +7736,9 @@

 	  x86_64-*linux*)

 	    LD="\${LD-ld} -m elf_x86_64"

 	    ;;

+	  ppc*le-*linux*|powerpc*le-*linux*)

+	    LD="\${LD-ld} -m elf64lppc"

+	    ;;

 	  ppc*-*linux*|powerpc*-*linux*)

 	    LD="\${LD-ld} -m elf64ppc"

 	    ;;

EOF

cat > $PATCH2 <

--- configure.orig	2014-03-18 16:35:28.942799967 -0500

+++ configure	2014-03-18 16:34:35.608519090 -0500

@@ -3798,6 +3798,9 @@

         x86_64-*linux*)

           LD="\${LD-ld} -m elf_i386"

           ;;

+        ppc64le-*linux*)

+          LD="\${LD-ld} -m elf32lppclinux"

+          ;;

         ppc64-*linux*)

           LD="\${LD-ld} -m elf32ppclinux"

           ;;

@@ -3814,6 +3817,9 @@

         x86_64-*linux*)

           LD="\${LD-ld} -m elf_x86_64"

           ;;

+        ppc*le-*linux*|powerpc*le-*linux*)

+          LD="\${LD-ld} -m elf64lppc"

+          ;;

         ppc*-*linux*|powerpc*-*linux*)

           LD="\${LD-ld} -m elf64ppc"

           ;;

EOF

FILES=`find . -name configure -o -name libtool.m4`

for f in $FILES; do

    # Filter out candidates that already handle ppc64le.

    if grep -s -e '-m elf64lppc' $f >/dev/null; then

	continue

    fi

    # Filter out candidates that don't handle PPC.

    if ! grep -s -e '-m elf64ppc' $f >/dev/null; then

	continue

    fi

    echo "Broken -m elf64ppc use in $f should handle elf64lppc."

    echo "Attempting automatic fix."

    # Attempt to fix the offended file.

    basename=`basename $f`

    dirname=`dirname $f`

    for p in $PATCH1 $PATCH2; do

	# This is an all for nothing affair.  The patch either

	# applies entirely clean, or we don't even try.

	#

	# Tentatively try either patch cleanly, and if we succeed then

	# do it for real.

	pushd $dirname 2>&1 > /dev/null

	if [ $basename = libtool.m4 ]; then

	    sed s/configure/libtool.m4/ < $p | patch --dry-run --follow-symlinks -l 2>&1 >/dev/null

	else

	    patch --dry-run --follow-symlinks -l < $p 2>&1 > /dev/null

	fi

	if [ $? != 0 ]; then

	    echo -n "$p approach did not work for $dirname/$basename: "

	    pwd

	    # This approach didn't work, try the next one.

	    popd 2>&1 > /dev/null

	    continue

	fi

	# Seriously now...

	if [ $basename = libtool.m4 ]; then

	    # Save the timestamp.

	    cp -p $basename /tmp/tmp.$$

	    sed s/configure/libtool.m4/ < $p | patch --follow-symlinks -l -s 2>&1 > /dev/null

	    # Use the old timestamp, to avoid anyone noticing changes

	    # to libtool.m4.

	    touch --reference=/tmp/tmp.$$ $basename

	    rm -f /tmp/tmp.$$

	else

	    patch --follow-symlinks -l -s < $p 2>&1 > /dev/null

	fi

	echo "Fixed $f for ld -m ppc64le support."

	popd 2>&1 > /dev/null

	break

    done

done

rm -f $PATCH1 $PATCH2