Original patch from: gentoo/src/patchsets/glibc/2.9/5070_all_glibc-2.7-cross-compile-nptl.patch

-= BEGIN original header =-
A little hack for cross-compiling NPTL

http://sourceware.org/ml/libc-alpha/2005-02/msg00043.html

-= END original header =-

diff -durN glibc-2_9.orig/nptl/sysdeps/pthread/configure glibc-2_9/nptl/sysdeps/pthread/configure
--- glibc-2_9.orig/nptl/sysdeps/pthread/configure	2007-10-17 00:24:30.000000000 +0200
+++ glibc-2_9/nptl/sysdeps/pthread/configure	2009-02-02 22:01:28.000000000 +0100
@@ -78,6 +78,10 @@
 fi
 { echo "$as_me:$LINENO: result: $libc_cv_forced_unwind" >&5
 echo "${ECHO_T}$libc_cv_forced_unwind" >&6; }
+if test $libc_cv_forced_unwind = no -a $build_cpu != $host_cpu; then
+  echo "$as_me:$LINENO: forcing libc_cv_forced_unwind = yes for cross-compile"
+  libc_cv_forced_unwind=yes
+fi
 if test $libc_cv_forced_unwind = yes; then
   cat >>confdefs.h <<\_ACEOF
 #define HAVE_FORCED_UNWIND 1
@@ -141,6 +145,10 @@
 { echo "$as_me:$LINENO: result: $libc_cv_c_cleanup" >&5
 echo "${ECHO_T}$libc_cv_c_cleanup" >&6; }
   CFLAGS="$old_CFLAGS"
+  if test $libc_cv_c_cleanup = no -a $build_cpu != $host_cpu; then
+    echo "$as_me:$LINENO: result: forcing libc_cv_c_cleanup = yes for cross-compile"
+    libc_cv_c_cleanup=yes
+  fi
   if test $libc_cv_c_cleanup = no; then
     { { echo "$as_me:$LINENO: error: the compiler must support C cleanup handling" >&5
 echo "$as_me: error: the compiler must support C cleanup handling" >&2;}
diff -durN glibc-2_9.orig/nptl/sysdeps/pthread/configure.in glibc-2_9/nptl/sysdeps/pthread/configure.in
--- glibc-2_9.orig/nptl/sysdeps/pthread/configure.in	2003-12-03 07:50:01.000000000 +0100
+++ glibc-2_9/nptl/sysdeps/pthread/configure.in	2009-02-02 22:01:28.000000000 +0100
@@ -28,6 +28,9 @@
 struct _Unwind_Context *context;
 _Unwind_GetCFA (context)],
 libc_cv_forced_unwind=yes, libc_cv_forced_unwind=no)])
+if test $libc_cv_forced_unwind = no -a $build_cpu != $host_cpu; then
+  libc_cv_forced_unwind=yes
+fi
 if test $libc_cv_forced_unwind = yes; then
   AC_DEFINE(HAVE_FORCED_UNWIND)
 dnl Check for C cleanup handling.
@@ -41,6 +44,9 @@
   puts ("test")],
 libc_cv_c_cleanup=yes, libc_cv_c_cleanup=no)])
   CFLAGS="$old_CFLAGS"
+  if test $libc_cv_c_cleanup = no -a $build_cpu != $host_cpu; then
+    libc_cv_c_cleanup=yes
+  fi
   if test $libc_cv_c_cleanup = no; then
     AC_MSG_ERROR([the compiler must support C cleanup handling])
   fi