* configure.tgt (targ_extra_obj) [aarch64*-*]: Define.
Fix PR17493, attempted output of *GAS `reg' section* symbol

The write.c change is to make gas report an error if reg_section
symbols should leak in future.  The tc-i386.c change is the real fix.

Note that the error isn't the most helpful, "redefined symbol cannot
be used on reloc", but I'm not inclined to improve what is really an
internal gas error.  reg_section symbols shouldn't leak..

gas/
	PR 17493
	* write.c (adjust_reloc_syms): Don't allow symbols in reg_section
	to be reduced to reg_section section symbol.
	* gas/config/tc-i386.c (i386_finalize_immediate): Reject all
	reg_section immediates.
gas/testsuite/
	* gas/i386/inval-equ-2.l: Adjust.
PowerPC64 ELFv1 function symbol definition vs LTO and discarded sections

When functions are emitted in comdat groups, global symbols defined in
duplicates of the group are treated as if they were undefined.  That
prevents the symbols in the discarded sections from affecting the
linker's global symbol hash table or causing duplicate symbol errors.
Annoyingly, when gcc emits a function to a comdat group, it does not
put *all* of a function's code and data in the comdat group.
Typically, constant tables, exception handling info, and debug info
are emitted to normal sections outside of the group, which is a
perennial source of linker problems due to the special handling needed
to deal with the extra-group pieces that ought to be discarded.  In
the case of powerpc64-gcc, the OPD entry for a function is not put in
the group.  Since the function symbol is defined on the OPD entry this
means we need to handle symbols in .opd specially.

To see how this affects LTO in particular, consider the linker
testcase PR ld/12942 (1).  This testcase links an LTO object file
pr12942a.o with a normal (non-LTO) object pr12942b.o.  Both objects
contain a definition for _Z4testv in a comdat group.  On loading
pr12942a.o, the linker sees a comdat group (actually linkonce section)
for _Z4testv and a weak _Z4testv defined in the IR.  On loading
pr12942b.o, the linker sees the same comdat group, and thus discards
it.  However, _Z4testv is a weak symbol defined in .opd, not part of
the group, so this weak symbol overrides the weak IR symbol.  On
(re)loading the LTO version of pr12942a.o, the linker sees another
weak _Z4testv, but this one does not override the value we have from
pr12942b.o.  The result is a linker complaint about "`_Z4testv'
... defined in discarded section `.group' of tmpdir/pr12942b.o".

	* elf64-ppc.c (ppc64_elf_add_symbol_hook): If function code
	section for function symbols defined in .opd is discarded, let
	the symbol appear to be undefined.
	(opd_entry_value): Ensure the result section is that for the
	function code section in the same object as the OPD entry.
Skip testing argv[0] on target argv[0] isn't available

I see the following two fails on arm-none-eabi target, because argv[0]
isn't available.

print argv[0]^M
$1 = 0x1f78 "/dev/null"^M
(gdb) FAIL: gdb.base/argv0-symlink.exp: kept file symbolic link name

print argv[0]^M
$1 = 0x1f78 "/dev/null"^M
(gdb) FAIL: gdb.base/argv0-symlink.exp: kept directory symbolic link name

My first thought is to check [target_info exists noargs], and skip the
test if it returns true.  However, noargs is set in gdbserver board
files, so argv0-symlink.exp will be skipped on gdbserver board file.
The change is too aggressive.

When the program is running with gdbserver, argv[1] to argv[N] aren't
available, but argv[0] is.  Fortunately, argv0-symlink.exp only
requires argv[0].  argv0-symlink.exp can be run with gdbserver board
file, as what we do now.

What we need to check is whether argv[0] is available, so I add a new
proc gdb_has_argv0 to do so by starting a program, and check
argc/argv[0] to see whether argv[0] is available.

Dan fixed the similar problem by checking noargs, which is too strong.
https://sourceware.org/ml/gdb-patches/2010-02/msg00398.html as a
result, the test is skipped on gdbserver.  This patch fixed it too.

gdb/testsuite:

2014-10-18  Yao Qi  <yao@codesourcery.com>

	* gdb.base/argv0-symlink.exp: Check argv[0] value if
	gdb_has_argv0 return true.
	* gdb.guile/scm-value.exp (test_value_in_inferior): Don't
	check [target_info exists noargs], check [gdb_has_argv0]
	instead.
	* gdb.python/py-value.exp (test_value_in_inferior): Likewise.
	* lib/gdb.exp (gdb_has_argv0, gdb_has_argv0_1): New
	procedures.
Fix the gdb.dwarf2/dw2-dir-file-name.exp test on MIPS

This patch fixes the failures that occur with the
gdb.dwarf2/dw2-dir-file-name.exp test on 64-bit MIPS and compressed
MIPS ISAs (i.e. MIPS16 and microMIPS).

The failures on 64-bit occur because the generated DWARF address
information is always 32-bit, which causes the upper 32-bits of
addresses to be truncated and causes breakpoints to be set on the
wrong address if any of the upper 32-bits are non-zero.  I suspect
that other 64-bit architectures get away with it because they
place all their instructions at a VMA lower than 2^32 by default.
This patch causes 64-bit addresses to be generated if a 64-bit
target is detected.

The failures on MIPS16 and microMIPS occur because the breakpoint
address needs to have the LSB set to 1 (used to indicate that the
code is compressed). However, the function name is interpreted as
a data label, causing GDB to set breakpoints at even addresses.
This is fixed by explicitly adding a '.insn' directive (see
https://sourceware.org/binutils/docs/as/MIPS-insn.html) after the
label on MIPS only.

gdb/testsuite/

2014-10-18  Kwok Cheung Yeung  <kcy@codesourcery.com>

	* gdb.dwarf2/dw2-dir-file-name.exp (addr_len): New.
	(out_cu): Use addr_len for the size of addresses.
	(out_line): Likewise.  Size DW_LNE_set_address instruction
	according to addr_len.
	* gdb.dwarf2/dw2-dir-file-name.c (START_INSNS): New.
	(FUNC): Add START_INSNS to definition.
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