re PR target/68772 (Many -gstabs tests FAIL with Xcode 7 as)

gcc/
	PR target/68772
	* config/rs6000/rs6000.h (ASM_CPU_SPEC): For -mcpu=powerpc64le,
	pass %(asm_cpu_power8)/-mpwr8.
	* config/rs6000/aix53.h: Likewise.
	* config/rs6000/aix61.h: Likewise.
	* config/rs6000/aix71.h: Likewise.

gcc/testsuite/
	PR target/68772
	* gcc.target/powerpc/pr68872.c: New test.

From-SVN: r231905

gcc/ChangeLog

+2015-12-22  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/68772
+	* config/rs6000/rs6000.h (ASM_CPU_SPEC): For -mcpu=powerpc64le,
+	pass %(asm_cpu_power8)/-mpwr8.
+	* config/rs6000/aix53.h: Likewise.
+	* config/rs6000/aix61.h: Likewise.
+	* config/rs6000/aix71.h: Likewise.
+
 2015-12-22  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/68937

gcc/config/rs6000/rs6000.h

@@ -128,6 +128,7 @@
 %{mcpu=power9: %(asm_cpu_power9)} \
 %{mcpu=a2: -ma2} \
 %{mcpu=powerpc: -mppc} \
+%{mcpu=powerpc64le: %(asm_cpu_power8)} \
 %{mcpu=rs64a: -mppc64} \
 %{mcpu=401: -mppc} \
 %{mcpu=403: -m403} \

gcc/testsuite/ChangeLog

+2015-12-22  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/68772
+	* gcc.target/powerpc/pr68872.c: New test.
+
 2015-12-22  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/68937

gcc/testsuite/gcc.target/powerpc/pr68872.c

+/* PR target/68872 */
+/* { dg-do assemble { target { powerpc64le-*-* } } } */
+/* { dg-options "-mcpu=powerpc64le" } */
+
+/* Verify that -mcpu=powerpc64le passes -mpower8 to the assembler.  */
+
+long
+bar (unsigned char *ptr, unsigned char val)
+{
+  long ret;
+  asm volatile ("stbcx. %0,0,%1" :: "r" (val), "r" (ptr));
+  asm volatile ("mfcr %0,8" : "=r" (ret) ::);
+  return ret;
+}