re PR target/55344 (Cross compiling for alpha-linux fails because <signal.h> doesn't exist)

	PR target/55344
	* config/alpha/linux-unwind.h: Disable when inhibit_libc is defined.

From-SVN: r194334

libgcc/ChangeLog

+2012-12-09  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/55344
+	* config/alpha/linux-unwind.h: Disable when inhibit_libc is defined.
+
 2012-12-06  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/sfp-machine.h (FP_EX_ALL): Define.

libgcc/config/alpha/linux-unwind.h

@@ -22,6 +22,7 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+#ifndef inhibit_libc
 /* Do code reading to identify a signal frame, and set the frame
    state data appropriately.  See unwind-dw2.c for the structs.  */
 
@@ -97,3 +98,4 @@ alpha_frob_update_context (struct _Unwind_Context *context,
 	  || pc[1] == 0x201f015f))	/* lda $0,NR_rt_sigreturn */
     _Unwind_SetSignalFrame (context, 1);
 }
+#endif