diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index 9f1d613672..85c20f2c40 100644
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,3 +1,16 @@
+2009-11-13  Nathan Froyd  <froydnj@codesourcery.com>
+
+	* configure.ac: If build != host, create a separate build-config.h
+	file desecribing the build machine.
+	* configure: Regenerate.
+	* lf.c: Include build-config.h instead of config.h.
+	* dgen.c: Likewise.
+	* igen.c: Likewise.
+	* misc.c: Likewise.
+	* misc.h: Likewise.
+	* filter.c: Likewise.
+	* table.c: Likewise.
+
 2009-10-15  Joel Sherrill <joel.sherrill@oarcorp.com>
 
 	* std-config.h: Fix spelling error.
diff --git a/sim/ppc/configure b/sim/ppc/configure
index abdfdb2015..f2f0be86f9 100755
--- a/sim/ppc/configure
+++ b/sim/ppc/configure
@@ -5867,6 +5867,32 @@ $as_echo "no" >&6; }
   sim_fpu=
 fi
 
+# Since we run commands on the build system, we have to create a
+# separate config header for the build system if build != host.
+if test x$host = x$build; then
+  ac_config_commands="$ac_config_commands build-config.h"
+
+else
+  tempdir=build.$$
+  rm -rf $tempdir
+  mkdir $tempdir
+  cd $tempdir
+  case ${srcdir} in
+  /* | A-Za-z:\\/* ) realsrcdir=${srcdir};;
+  *) realsrcdir=../${srcdir};;
+  esac
+  saved_CFLAGS="${CFLAGS}"
+  CC="${CC_FOR_BUILD}" CFLAGS="${CFLAGS_FOR_BUILD}" \
+  LDFLAGS="${LDFLAGS_FOR_BUILD}" \
+  ${realsrcdir}/configure \
+    --enable-languages=${enable_languages-all} \
+    --target=$target_alias --host=$build_alias --build=$build_alias
+  CFLAGS="${saved_CFLAGS}"
+  mv config.h ../build-config.h
+  cd ..
+  rm -rf $tempdir
+fi
+
 
 
 
@@ -6701,6 +6727,7 @@ for ac_config_target in $ac_config_targets
 do
   case $ac_config_target in
     "config.h") CONFIG_HEADERS="$CONFIG_HEADERS config.h:config.in" ;;
+    "build-config.h") CONFIG_COMMANDS="$CONFIG_COMMANDS build-config.h" ;;
     "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
     "default") CONFIG_COMMANDS="$CONFIG_COMMANDS default" ;;
 
@@ -7247,6 +7274,7 @@ $as_echo "$as_me: executing $ac_file commands" >&6;}
 
 
   case $ac_file$ac_mode in
+    "build-config.h":C) cp config.h build-config.h ;;
     "default":C) case x$CONFIG_HEADERS in xconfig.h:config.in) echo > stamp-h ;; esac ;;
 
   esac
diff --git a/sim/ppc/configure.ac b/sim/ppc/configure.ac
index e8ccfe97da..55699b228c 100644
--- a/sim/ppc/configure.ac
+++ b/sim/ppc/configure.ac
@@ -848,6 +848,31 @@ else
   sim_fpu=
 fi
 
+# Since we run commands on the build system, we have to create a
+# separate config header for the build system if build != host.
+if test x$host = x$build; then
+  AC_CONFIG_COMMANDS([build-config.h],[cp config.h build-config.h])
+else
+  tempdir=build.$$
+  rm -rf $tempdir
+  mkdir $tempdir
+  cd $tempdir
+  case ${srcdir} in
+  /* | [A-Za-z]:[\\/]* ) realsrcdir=${srcdir};;
+  *) realsrcdir=../${srcdir};;
+  esac
+  saved_CFLAGS="${CFLAGS}"
+  CC="${CC_FOR_BUILD}" CFLAGS="${CFLAGS_FOR_BUILD}" \
+  LDFLAGS="${LDFLAGS_FOR_BUILD}" \
+  ${realsrcdir}/configure \
+    --enable-languages=${enable_languages-all} \
+    --target=$target_alias --host=$build_alias --build=$build_alias
+  CFLAGS="${saved_CFLAGS}"
+  mv config.h ../build-config.h
+  cd ..
+  rm -rf $tempdir
+fi
+
 dnl Check for exe extension
 AC_EXEEXT
 
diff --git a/sim/ppc/dgen.c b/sim/ppc/dgen.c
index 54e0e2657c..98f9eb0d23 100644
--- a/sim/ppc/dgen.c
+++ b/sim/ppc/dgen.c
@@ -27,7 +27,7 @@
 #include <ctype.h>
 #include <stdarg.h>
 
-#include "config.h"
+#include "build-config.h"
 #include "misc.h"
 #include "lf.h"
 #include "table.h"
diff --git a/sim/ppc/filter.c b/sim/ppc/filter.c
index c901a1777f..a1597757cd 100644
--- a/sim/ppc/filter.c
+++ b/sim/ppc/filter.c
@@ -21,7 +21,7 @@
 
 #include <stdio.h>
 
-#include "config.h"
+#include "build-config.h"
 
 #ifdef HAVE_STRING_H
 #include <string.h>
diff --git a/sim/ppc/igen.c b/sim/ppc/igen.c
index cc096626f8..4ac6708c3e 100644
--- a/sim/ppc/igen.c
+++ b/sim/ppc/igen.c
@@ -25,7 +25,7 @@
 #include "misc.h"
 #include "lf.h"
 #include "table.h"
-#include "config.h"
+#include "build-config.h"
 
 #include "filter.h"
 
diff --git a/sim/ppc/lf.c b/sim/ppc/lf.c
index fc2a3c1352..e47dfda5da 100644
--- a/sim/ppc/lf.c
+++ b/sim/ppc/lf.c
@@ -23,7 +23,7 @@
 #include <stdarg.h>
 #include <ctype.h>
 
-#include "config.h"
+#include "build-config.h"
 #include "misc.h"
 #include "lf.h"
 
diff --git a/sim/ppc/misc.c b/sim/ppc/misc.c
index d8e54ed497..23e981a184 100644
--- a/sim/ppc/misc.c
+++ b/sim/ppc/misc.c
@@ -23,7 +23,7 @@
 #include <stdarg.h>
 #include <ctype.h>
 
-#include "config.h"
+#include "build-config.h"
 #include "misc.h"
 
 #ifdef HAVE_STDLIB_H
diff --git a/sim/ppc/misc.h b/sim/ppc/misc.h
index 50301fd64f..d09d5fecfd 100644
--- a/sim/ppc/misc.h
+++ b/sim/ppc/misc.h
@@ -21,7 +21,7 @@
 
 /* Frustrating header junk */
 
-#include "config.h"
+#include "build-config.h"
 
 #include <stdio.h>
 #include <ctype.h>
diff --git a/sim/ppc/table.c b/sim/ppc/table.c
index d9538b3d7d..db3f783bb3 100644
--- a/sim/ppc/table.c
+++ b/sim/ppc/table.c
@@ -25,7 +25,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 
-#include "config.h"
+#include "build-config.h"
 #include "misc.h"
 #include "lf.h"
 #include "table.h"