Change the readelf and objdump programs so that they will automatically follow links to separate debug info files.

	* configure.ac (follow-debug-links): Add option to enable or
	disable the following of debug links by default.  Set the
	default for the option to be 'follow'.
	* dwarf.c (do_follow_links): Initialise with DEFAULT_FOR_FOLLOW_LINKS.
	(dwarf_select_sections_by_names): Add no-follow-links option.
	(dwarf_select_sections_by_letter): Add 'N' option.
	* objdump.c (usage): Add conditional text describing the
	follow links option.
	(slurp_symtab): Ensure that there is a NULL entry at the end
	of the symbol table.
	(slurp_dynamic_symtab): Likewise.
	(dump_bfd): When extending the symbol table, ensure that there
	is still a NULL entry at the end.
	* readelf.c (usage): Add conditional text describing the
	follow links option.
	* doc/binutils.texi: Update documentation for objcopy and
	readelf.
	* doc/debug.options.texi: Update documentation of the
	follow-links option.
	* config.in: Regenerate.
	* configure: Regenerate.
	* testsuite/binutils-all/compress.exp: Add the -WN option to
	objdump command lines that are not expecting to follow links.
	* testsuite/binutils-all/readelf.exp: Add the
	--debug-dump=no-follow-links option to tests that are not
	expecting to follow debug links.

gas	* testsuite/gas/mach-o/sections-1.d: Stop automatic debug link
        following.
	* testsuite/gas/xgate/insns-dwarf2.d: Likewise.

ld	* testsuite/ld-elf/sec64k.exp: Stop readelf from automatically
	following debug links.

1 files changed, 2 insertions, 2 deletions

diff --git a/binutils/testsuite/binutils-all/objdump.exp b/binutils/testsuite/binutils-all/objdump.exp
index aa8c207..6f95d40 100644
--- a/binutils/testsuite/binutils-all/objdump.exp
+++ b/binutils/testsuite/binutils-all/objdump.exp
@@ -606,7 +606,7 @@ if { [is_elf_format] } then {
 	set testfile tmpdir/debuglink.${obj}
     }
 
-    set got [remote_exec host "$OBJDUMP $OBJDUMPFLAGS -Wk $testfile" "" "/dev/null" "objdump.out"]
+    set got [remote_exec host "$OBJDUMP $OBJDUMPFLAGS -Wk -WN $testfile" "" "/dev/null" "objdump.out"]
 
     if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
 	fail "objdump -Wk (reason: unexpected output)"
@@ -615,7 +615,7 @@ if { [is_elf_format] } then {
     }
 
     if { [regexp_diff objdump.out $srcdir/$subdir/objdump.Wk] } then {
-	fail "objdump -Wk"
+	fail "objdump -Wk (reason: output does not match expectations)"
     } else {
 	pass "objdump -Wk"
     }