gcc: fix build of gcc 6.x on Microblaze

Due to patch 840-microblaze-enable-dwarf-eh-support.patch, gcc 6.x
does not build:

../../gcc/config/microblaze/microblaze.c: In function 'void microblaze_expand_epilogue()':
../../gcc/config/microblaze/microblaze.c:3046: error: 'gen_rtx_raw_REG' was not declared in this scope

This patch was originally added to gcc 4.9 to make it capable of
building glibc. However, this is no longer needed with gcc 6.x, which
builds glibc just fine.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/6.1.0/840-microblaze-enable-dwarf-eh-support.patch

@@ -1,166 +0,0 @@
-Fetched from Xilinx gcc git at https://github.com/Xilinx/gcc
-
-From 23c35173490ac2d6348a668dfc9c1a6eb62171f2 Mon Sep 17 00:00:00 2001
-From: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
-Date: Mon, 18 Jun 2012 20:18:13 +0200
-Subject: [PATCH] [Patch, microblaze]: Enable DWARF exception handling support.
-
-Changelog
-
-2013-03-18  Edgar E. Iglesias <edgar.iglesias@xilinx.com>
-            David Holsgrove <david.holsgrove@xilinx.com>
-
- * common/config/microblaze/microblaze-common.c: Remove
-   TARGET_EXCEPT_UNWIND_INFO definition.
- * config/microblaze/microblaze-protos.h: Add
-   microblaze_eh_return prototype.
- * gcc/config/microblaze/microblaze.c: (microblaze_must_save_register,
-   microblaze_expand_epilogue, microblaze_return_addr): Handle
-   calls_eh_return
-   (microblaze_eh_return): New function.
- * gcc/config/microblaze/microblaze.h: Define RETURN_ADDR_OFFSET,
-   EH_RETURN_DATA_REGNO, MB_EH_STACKADJ_REGNUM, EH_RETURN_STACKADJ_RTX,
-   ASM_PREFERRED_EH_DATA_FORMAT
- * gcc/config/microblaze/microblaze.md: Define eh_return pattern.
-
-Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>
-Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
----
- gcc/common/config/microblaze/microblaze-common.c |  3 ---
- gcc/config/microblaze/microblaze-protos.h        |  1 +
- gcc/config/microblaze/microblaze.c               | 29 ++++++++++++++++++++----
- gcc/config/microblaze/microblaze.h               | 15 ++++++++++++
- gcc/config/microblaze/microblaze.md              | 11 +++++++++
- 5 files changed, 52 insertions(+), 7 deletions(-)
-
-Index: b/gcc/common/config/microblaze/microblaze-common.c
-===================================================================
---- a/gcc/common/config/microblaze/microblaze-common.c
-+++ b/gcc/common/config/microblaze/microblaze-common.c
-@@ -37,7 +37,4 @@
- #undef  TARGET_OPTION_OPTIMIZATION_TABLE
- #define TARGET_OPTION_OPTIMIZATION_TABLE microblaze_option_optimization_table
- 
--#undef TARGET_EXCEPT_UNWIND_INFO
--#define TARGET_EXCEPT_UNWIND_INFO  sjlj_except_unwind_info
--
- struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
-Index: b/gcc/config/microblaze/microblaze-protos.h
-===================================================================
---- a/gcc/config/microblaze/microblaze-protos.h
-+++ b/gcc/config/microblaze/microblaze-protos.h
-@@ -57,6 +57,7 @@
- extern int symbol_mentioned_p (rtx);
- extern int label_mentioned_p (rtx);
- extern bool microblaze_cannot_force_const_mem (machine_mode, rtx);
-+extern void microblaze_eh_return (rtx op0);
- #endif  /* RTX_CODE */
- 
- /* Declare functions in microblaze-c.c.  */
-Index: b/gcc/config/microblaze/microblaze.c
-===================================================================
---- a/gcc/config/microblaze/microblaze.c
-+++ b/gcc/config/microblaze/microblaze.c
-@@ -1924,6 +1924,11 @@
-   if (frame_pointer_needed && (regno == HARD_FRAME_POINTER_REGNUM))
-     return 1;
- 
-+  if (crtl->calls_eh_return
-+      && regno == MB_ABI_SUB_RETURN_ADDR_REGNUM) {
-+    return 1;
-+  }
-+
-   if (!crtl->is_leaf)
-     {
-       if (regno == MB_ABI_SUB_RETURN_ADDR_REGNUM)
-@@ -1951,6 +1956,13 @@
- 	return 1;
-     }
- 
-+  if (crtl->calls_eh_return
-+      && (regno == EH_RETURN_DATA_REGNO (0)
-+          || regno == EH_RETURN_DATA_REGNO (1)))
-+    {
-+      return 1;
-+    }
-+
-   return 0;
- }
- 
-@@ -3027,6 +3039,12 @@
-       emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, fsiz_rtx));
-     }
- 
-+  if (crtl->calls_eh_return)
-+    emit_insn (gen_addsi3 (stack_pointer_rtx,
-+                           stack_pointer_rtx,
-+                           gen_rtx_raw_REG (SImode,
-+                                            MB_EH_STACKADJ_REGNUM)));
-+
-   emit_jump_insn (gen_return_internal (gen_rtx_REG (Pmode, GP_REG_FIRST +
- 						    MB_ABI_SUB_RETURN_ADDR_REGNUM)));
- }
-@@ -3324,10 +3342,13 @@
-   if (count != 0)
-     return NULL_RTX;
- 
--  return gen_rtx_PLUS (Pmode,
--		       get_hard_reg_initial_val (Pmode,
--						 MB_ABI_SUB_RETURN_ADDR_REGNUM),
--		       GEN_INT (8));
-+  return get_hard_reg_initial_val (Pmode,
-+                                   MB_ABI_SUB_RETURN_ADDR_REGNUM);
-+}
-+
-+void microblaze_eh_return (rtx op0)
-+{
-+  emit_insn (gen_movsi(gen_rtx_MEM(Pmode, stack_pointer_rtx), op0));
- }
- 
- /* Queue an .ident string in the queue of top-level asm statements.
-Index: b/gcc/config/microblaze/microblaze.h
-===================================================================
---- a/gcc/config/microblaze/microblaze.h
-+++ b/gcc/config/microblaze/microblaze.h
-@@ -184,6 +184,21 @@
- #define INCOMING_RETURN_ADDR_RTX  			\
-   gen_rtx_REG (VOIDmode, GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM)
- 
-+/* Specifies the offset from INCOMING_RETURN_ADDR_RTX and the actual return PC.  */
-+#define RETURN_ADDR_OFFSET (8)
-+
-+/* Describe how we implement __builtin_eh_return.  */
-+#define EH_RETURN_DATA_REGNO(N) (((N) < 2) ? MB_ABI_FIRST_ARG_REGNUM + (N) : INVALID_REGNUM)
-+
-+#define MB_EH_STACKADJ_REGNUM  MB_ABI_INT_RETURN_VAL2_REGNUM
-+#define EH_RETURN_STACKADJ_RTX  gen_rtx_REG (Pmode, MB_EH_STACKADJ_REGNUM)
-+
-+/* Select a format to encode pointers in exception handling data.  CODE
-+   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
-+   true if the symbol may be affected by dynamic relocations.  */
-+#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
-+  ((flag_pic || GLOBAL) ? DW_EH_PE_aligned : DW_EH_PE_absptr)
-+
- /* Use DWARF 2 debugging information by default.  */
- #define DWARF2_DEBUGGING_INFO
- #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
-Index: b/gcc/config/microblaze/microblaze.md
-===================================================================
---- a/gcc/config/microblaze/microblaze.md
-+++ b/gcc/config/microblaze/microblaze.md
-@@ -2324,4 +2324,15 @@
-   (set_attr "mode"      "SI")
-   (set_attr "length"    "4")])
- 
-+; This is used in compiling the unwind routines.
-+(define_expand "eh_return"
-+  [(use (match_operand 0 "general_operand" ""))]
-+  ""
-+  "
-+{
-+  microblaze_eh_return(operands[0]);
-+  DONE;
-+}")
-+
- (include "sync.md")
-+