Make coff backend data read-only

The bfd_coff_backend_data struct should be read-only, the only thing
preventing this is that objcopy writes to one of the fields,
_bfd_coff_long_section_names.  This patch creates a copy of the field
in bfd coff_obj_tdata, which makes more sense anyway.  When enabling
long section names the intent is to do so for a particular bfd, not
for all bfds that might happen to be using the target xvec.

bfd/
	* coffcode.h: Update coff long section name comment.
	(bfd_coff_set_long_section_names_allowed): Use macro accessor
	to set flag.
	(bfd_coff_set_long_section_names_disallowed): Tidy.
	(coff_backend_info): Return a const pointer.
	(bfd_coff_std_swap_table, ticoff0_swap_table, ticoff1_swap_table),
	(bigobj_swap_table): Make const.
	(bfd_coff_long_section_names): Use tdata copy.
	(coff_mkobject): Set long_section_names from coff_backend_info.
	* coff-go32.c (_bfd_go32_mkobject): Likewise.
	* peicode.h (pe_mkobject): Likewise.
	* coff-sh.c (bfd_coff_small_swap_table): Make const.
	* libcoff-in.h (struct coff_tdata): Add long_section_names,
	reorder fields.
	* libcoff.h: Regenerate.
binutils/
	* objcopy.c (set_long_section_mode): Move earlier in file.
	(copy_object): Call set_long_section_mode here, after setting
	output format.
	(copy_file): Don't call set_long_section_mode.

1 files changed, 16 insertions, 19 deletions

diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index 80a5d52..b8958bc 100644
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -2610,6 +2610,19 @@ check_new_section_flags (flagword flags, bfd * abfd, const char * secname)
   return flags;
 }
 
+static void
+set_long_section_mode (bfd *output_bfd, bfd *input_bfd, enum long_section_name_handling style)
+{
+  /* This is only relevant to Coff targets.  */
+  if (bfd_get_flavour (output_bfd) == bfd_target_coff_flavour)
+    {
+      if (style == KEEP
+	  && bfd_get_flavour (input_bfd) == bfd_target_coff_flavour)
+	style = bfd_coff_long_section_names (input_bfd) ? ENABLE : DISABLE;
+      bfd_coff_set_long_section_names (output_bfd, style != DISABLE);
+    }
+}
+
 /* Copy object file IBFD onto OBFD.
    Returns TRUE upon success, FALSE otherwise.  */
 
@@ -2660,6 +2673,9 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch)
       return false;
     }
 
+  /* This is a no-op on non-Coff targets.  */
+  set_long_section_mode (obfd, ibfd, long_section_names);
+
   /* Set the Verilog output endianness based upon the input file's
      endianness.  We may not be producing verilog format output,
      but testing this just adds extra code this is not really
@@ -3765,19 +3781,6 @@ copy_archive (bfd *ibfd, bfd *obfd, const char *output_target,
   free (dir);
 }
 
-static void
-set_long_section_mode (bfd *output_bfd, bfd *input_bfd, enum long_section_name_handling style)
-{
-  /* This is only relevant to Coff targets.  */
-  if (bfd_get_flavour (output_bfd) == bfd_target_coff_flavour)
-    {
-      if (style == KEEP
-	  && bfd_get_flavour (input_bfd) == bfd_target_coff_flavour)
-	style = bfd_coff_long_section_names (input_bfd) ? ENABLE : DISABLE;
-      bfd_coff_set_long_section_names (output_bfd, style != DISABLE);
-    }
-}
-
 /* The top-level control.  */
 
 static void
@@ -3885,9 +3888,6 @@ copy_file (const char *input_filename, const char *output_filename, int ofd,
 	  gnu_debuglink_filename = NULL;
 	}
 
-      /* This is a no-op on non-Coff targets.  */
-      set_long_section_mode (obfd, ibfd, long_section_names);
-
       copy_archive (ibfd, obfd, output_target, force_output_target, input_arch);
     }
   else if (bfd_check_format_matches (ibfd, bfd_object, &obj_matching))
@@ -3913,9 +3913,6 @@ copy_file (const char *input_filename, const char *output_filename, int ofd,
  	  return;
  	}
 
-      /* This is a no-op on non-Coff targets.  */
-      set_long_section_mode (obfd, ibfd, long_section_names);
-
       if (! copy_object (ibfd, obfd, input_arch))
 	status = 1;