[patch 2/5] kexec improve build for ppc64

[Geoff Levand]

Powerpc 64 bit platforms support both 64 bit and 32 bit runtimes.  Allow
ARCH= to be specified on the command line to separate the processor arch
from the compiler machine.  This also helps cross-builds with non-standard
compiler names.

Signed-off-by: Geoff Levand <geoffrey.levand at am.sony.com>
---
 configure.ac |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- kexec-tools-hacked.orig/configure.ac
+++ kexec-tools-hacked/configure.ac
@@ -45,7 +45,12 @@ case $host_cpu in
 		AC_MSG_ERROR([ unsupported architecture $host_cpu])
 		;;
 esac
-ARCH=$host_cpu
+
+dnl Try to guess the kernel ARCH based on the autoconf host_cpu variable.
+
+if ! test "${ARCH}" ; then
+	ARCH=$host_cpu
+fi
 
 dnl ---Options
 
@@ -59,10 +64,14 @@ BUILD_CFLAGS='-O2 -Wall $(CPPFLAGS)'
 
 # Check whether ppc64. Add -m64 for building 64-bit binary
 # Add -mcall-aixdesc to generate dot-symbols as in gcc 3.3.3
-if test "$ARCH" = ppc64; then
+if test "$host_cpu" = ppc64; then
   EXTRA_CFLAGS="$EXTRA_CFLAGS -m64 -mcall-aixdesc"
 fi;
 
+if test "$host_cpu" = ppc; then
+  EXTRA_CFLAGS="$EXTRA_CFLAGS -m32"
+fi;
+
 AC_ARG_WITH([objdir], AC_HELP_STRING([--with-objdir=<dir>],[select directory for object files]),
 	[ OBJDIR="$withval" ], [ OBJDIR="$OBJDIR" ])
 

--