objcopy renaming section with explicit flags

This tidies SEC_RELOC handling in bfd, in the process fixing a bug
with objcopy when renaming sections.

bfd/
	* reloc.c (_bfd_generic_set_reloc): Set/clear SEC_RELOC depending
	on reloc count.
	* elf64-sparc.c (elf64_sparc_set_reloc): Likewise.
binutils/
	* objcopy.c (copy_relocations_in_section): Remove now unnecessary
	clearing of SEC_RELOC.
	* testsuite/binutils-all/rename-section-01.d: New test.
	* testsuite/binutils-all/objcopy.exp: Run it.
gas/
	* write.c (size_seg): Remove unneccesary twiddle of SEC_RELOC.
	(write_relocs): Likewise.  Always call bfd_set_reloc.

binutils/objcopy.c

@@ -4331,10 +4331,7 @@ copy_relocations_in_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
     }
 
   if (relsize == 0)
-    {
-      bfd_set_reloc (obfd, osection, NULL, 0);
-      osection->flags &= ~SEC_RELOC;
-    }
+    bfd_set_reloc (obfd, osection, NULL, 0);
   else
     {
       if (isection->orelocation != NULL)
@@ -4377,8 +4374,6 @@ copy_relocations_in_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
 	}
 
       bfd_set_reloc (obfd, osection, relcount == 0 ? NULL : relpp, relcount);
-      if (relcount == 0)
-	osection->flags &= ~SEC_RELOC;
     }
 }
 

binutils/testsuite/binutils-all/objcopy.exp

@@ -1448,3 +1448,5 @@ if { [istarget *-*-cygwin] || [istarget *-*-mingw*] } {
 if { ![is_xcoff_format] } {
     objcopy_test "pr25662" $src executable "" $ldflags
 }
+
+run_dump_test "rename-section-01"

binutils/testsuite/binutils-all/rename-section-01.d

@@ -0,0 +1,14 @@
+#PROG: objcopy
+#name: objcopy rename-section with flags - keep relocation
+#source: needed-by-reloc.s
+#objcopy: --rename-section .data=myrodata,contents,alloc,load,readonly
+#objdump: -r
+#notarget: alpha*-*-*vms* rx-*-elf [is_som_format] [is_aout_format]
+
+.*: +file format .*
+
+#...
+RELOCATION RECORDS FOR .*myrodata.*:
+OFFSET +TYPE +VALUE
+0+ .*
+#pass