Add TARGET_SUPPORTS_PIC flag and check that the flag_pic = 2

 * config/microblaze/linux.h (TARGET_SUPPORTS_PIC): Define as 1.
 * config/microblaze/microblaze.h (TARGET_SUPPORTS_PIC): Define as 1.
 * config/microblaze/microblaze.c (microblaze_option_override):
    Bail out early for PIC modes when target does not support PIC.
 * gcc.dg/20020312-2.c: Define MicroBlaze PIC register

From-SVN: r196104

gcc/ChangeLog

 2013-02-16  Edgar E. Iglesias  <edgar.iglesias@gmail.com>
 
+	* config/microblaze/linux.h (TARGET_SUPPORTS_PIC): Define as 1.
+	* config/microblaze/microblaze.h (TARGET_SUPPORTS_PIC): Define as 1.
+	* config/microblaze/microblaze.c (microblaze_option_override):
+	Bail out early for PIC modes when target does not support PIC.
+
+2013-02-16  Edgar E. Iglesias  <edgar.iglesias@gmail.com>
+
 	* config/microblaze/microblaze.c (microblaze_asm_trampoline_template): 
 	Replace with a microblaze version.
 	(microblaze_trampoline_init): Adapt for microblaze.

gcc/config/microblaze/linux.h

@@ -19,6 +19,8 @@
    along with GCC; see the file COPYING3.  If not see
    <http://www.gnu.org/licenses/>.  */
 
+#undef TARGET_SUPPORTS_PIC
+#define TARGET_SUPPORTS_PIC 1
 
 #define DYNAMIC_LINKER "/lib/ld.so.1"
 #undef  SUBTARGET_EXTRA_SPECS

gcc/config/microblaze/microblaze.c

@@ -1299,6 +1299,18 @@ microblaze_option_override (void)
 				  ? g_switch_value
 				  : MICROBLAZE_DEFAULT_GVALUE);
 
+  if (flag_pic)
+    {
+      /* Make sure it's 2, we only support one kind of PIC.  */
+      flag_pic = 2;
+      if (!TARGET_SUPPORTS_PIC)
+        {
+          error ("-fPIC/-fpic not supported for this target");
+          /* Clear it to avoid further errors.  */
+          flag_pic = 0;
+        }
+    }
+
   /* Check the MicroBlaze CPU version for any special action to be done.  */
   if (microblaze_select_cpu == NULL)
     microblaze_select_cpu = MICROBLAZE_DEFAULT_CPU;

gcc/config/microblaze/microblaze.h

@@ -58,6 +58,9 @@ extern enum pipeline_type microblaze_pipe;
 #define TARGET_DEFAULT      (MASK_SOFT_MUL | MASK_SOFT_DIV | MASK_SOFT_FLOAT \
                              | TARGET_ENDIAN_DEFAULT)
 
+/* The default is to support PIC.  */
+#define TARGET_SUPPORTS_PIC 1
+
 /* What is the default setting for -mcpu= . We set it to v4.00.a even though 
    we are actually ahead. This is safest version that has generate code 
    compatible for the original ISA */

gcc/testsuite/ChangeLog

+2013-02-16  Edgar E. Iglesias  <edgar.iglesias@gmail.com>
+
+	* gcc.dg/20020312-2.c: Define MicroBlaze PIC register
+
 2013-02-16  Jakub Jelinek  <jakub@redhat.com>
 	    Dodji Seketeli  <dodji@redhat.com>
 

gcc/testsuite/gcc.dg/20020312-2.c

@@ -42,6 +42,8 @@ extern void abort (void);
 /* No pic register.  */
 #elif defined(__mcore__)
 /* No pic register.  */
+#elif defined(__MICROBLAZE__)
+# define PIC_REG "r20"
 #elif defined(__mips__)
 /* PIC register is $28, but is used even without -fpic.  */
 #elif defined(__MMIX__)