[committed] Fix regression on mcore-elf port after recent switch conversion change

[Jeffrey Law]

Filip's recent change to re-enable switch conversion at -Og triggered a 
regression on the mcore-elf target.

If we look at tree-switch-conversion.cc we have this:


#ifndef ASM_OUTPUT_ADDR_DIFF_ELT
   if (flag_pic)
     return false;
#endif

The mcore-elf port defines a dummy ASM_OUTPUT_ADDR_DIFF_ELT which is 
designed to trigger an assembler syntax error and thus fail loudly.  
That definition comes from a time when it appears we had to define that 
macro in every port, even if it wasn't being used.

These days we do not need to define that macro unless it's really 
needed.  And a definition like the one for mcore-elf will cause problems 
(compile/pr69102.c).  That definition has also been the cause of a long 
standing failure in the port (gcc.dg/pr47446-2.c).

Naturally this has been through a round of testing where it fixes the 
two issues noted above without any regressions.

Pushing to the trunk.

Jeff

-------------- next part --------------
gcc/
	* config/mcore/mcore.h (ASM_OUT_ADDR_DIFF_ELT): Remove.


diff --git a/gcc/config/mcore/mcore.h b/gcc/config/mcore/mcore.h
index f8e718ad5fba..b25718e8798f 100644
--- a/gcc/config/mcore/mcore.h
+++ b/gcc/config/mcore/mcore.h
@@ -654,11 +654,6 @@ extern long mcore_current_compilation_timestamp;
 #define ASM_OUTPUT_CASE_LABEL(STREAM,PREFIX,NUM,TABLE) \
   fprintf (STREAM, "\t.align 2\n.%s%d:\n", PREFIX, NUM);
 
-/* Output a relative address. Not needed since jump tables are absolute
-   but we must define it anyway.  */
-#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM,BODY,VALUE,REL)  \
-  fputs ("- - - ASM_OUTPUT_ADDR_DIFF_ELT called!\n", STREAM)
-
 /* Output an element of a dispatch table.  */
 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM,VALUE)  \
     fprintf (STREAM, "\t.long\t.L%d\n", VALUE)