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2021-06-17Don't call sigtimedwait for scoped_ignore_sigttouPedro Alves3-6/+24
Because SIGTTOU is sent to the whole process instead of to a specific thread, consuming a pending SIGTTOU in the destructor of scoped_ignore_sigttou could consume a SIGTTOU signal raised due to actions done by some other thread. Simply avoid sigtimedwait in scoped_ignore_sigttou, thus plugging the race. This works because we know that when the thread writes to the terminal and the signal is blocked, the kernel does not raise the signal at all. Tested on GNU/Linux, Solaris 11 and FreeBSD. gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * scoped_ignore_signal.h (scoped_ignore_signal): Add ConsumePending template parameter. (scoped_ignore_signal::~scoped_ignore_signal): Skip calling sigtimedwait if ConsumePending is false. (scoped_ignore_sigpipe): Initialize with ConsumePending=true. * scoped_ignore_sigttou.h (scoped_ignore_sigttou) <m_ignore_signal>: Initialize with ConsumePending=false. Change-Id: I92f754dbc45c45819dce2ce68b8c067d8d5c61b1
2021-06-17x86-64: Use $NOPIE_LDFLAGS/$NOPIE_CFLAGS on protected-func-1H.J. Lu2-1/+8
PR ld/27973 * testsuite/ld-x86-64/x86-64.exp: Pass $NOPIE_LDFLAGS and $NOPIE_CFLAGS to protected-func-1 without PIE.
2021-06-17x86-64: Test protected function pointersH.J. Lu5-0/+122
On x86-64, function pointers in executable for external funtions may be resolved to their PLT entries in executable. If it happens, function pointers of protected funtions in shared libraries must be resolved to the PLT entries in executable, not addresses of protected funtions in shared libraries. PR ld/27973 * testsuite/ld-x86-64/x86-64.exp: Run protected function tests. * testsuite/ld-x86-64/protected-func-1.h: New file. * testsuite/ld-x86-64/protected-func-1a.s: Likewise. * testsuite/ld-x86-64/protected-func-1b.c: Likewise.
2021-06-17ld: Add ChangeLog entry for -no-pieFangrui Song1-0/+7
2021-06-17ld: Add -no-pieFangrui Song3-0/+11
gold has had this option for many years. Not having this option caused some confusion to users. The help message clarifies the default state. ld/ * ldlex.h (enum option_values): Add OPTION_NO_PIE. * lexsup.c (struct ld_options): Add -no-pie. (parse_args): Handle -no-pie. * ld.texi: Document -no-pie.
2021-06-17Add a unit test for scoped_ignore_sigpipePedro Alves3-0/+133
gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * Makefile.in (SELFTESTS_SRCS): Add unittests/scoped_ignore_signal-selftests.c. * unittests/scoped_ignore_signal-selftests.c: New. Change-Id: Idce24aa9432a3f1eb7065bc9aa030b1d0d7dcad5
2021-06-17scoped_ignore_signal: Use sigprocmask+sigtimedwait instead of signalPedro Alves2-2/+44
The problem with using signal(...) to temporarily ignore a signal, is that that changes the the signal disposition for the whole process. If multiple threads do it at the same time, you have a race. Fix this by using sigprocmask + sigtimedwait to implement the ignoring instead, if available, which I think probably means everywhere except Windows nowadays. This way, we only change the signal mask for the current thread, so there's no race. Change-Id: Idfe3fb08327ef8cae926f3de9ee81c56a83b1738 gdbsupport/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * scoped_ignore_signal.h (scoped_ignore_signal::scoped_ignore_signal) [HAVE_SIGPROCMASK]: Use sigprocmask to block the signal instead of changing the signal disposition for the whole process. (scoped_ignore_signal::~scoped_ignore_signal) [HAVE_SIGPROCMASK]: Use sigtimedwait and sigprocmask to flush and unblock the signal.
2021-06-17Introduce scoped_restore_signalPedro Alves4-40/+120
We currently have scoped_restore_sigttou and scoped_restore_sigpipe doing basically the same thing -- temporarily ignoring a specific signal. This patch introduce a scoped_restore_signal type that can be used for both. This will become more important for the next patch which changes how the signal-ignoring is implemented. scoped_restore_sigpipe is a straight alias to scoped_restore_signal<SIGPIPE> on systems that define SIGPIPE, and an alias to scoped_restore_signal_nop (a no-op version of scoped_restore_signal) otherwise. scoped_restore_sigttou is not a straight alias because it wants to check the job_control global. gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * gdbsupport/scoped_ignore_signal.h: New. * compile/compile.c: Include gdbsupport/scoped_ignore_signal.h instead of <signal.h>. Don't include <unistd.h>. (scoped_ignore_sigpipe): Remove. * gdbsupport/scoped_ignore_sigttou.h: Include gdbsupport/scoped_ignore_signal.h instead of <signal.h>. Don't include <unistd.h>. (lazy_init): New. (scoped_ignore_sigttou): Reimplement using scoped_ignore_signal and lazy_init. Change-Id: Ibb44d0bd705e96df03ef0787c77358a4a7b7086c
2021-06-17Move scoped_ignore_sigttou to gdbsupport/Pedro Alves8-9/+18
A following patch will want to use scoped_ignore_sigttou in code shared between GDB and GDBserver. Move it under gdbsupport/. Note that despite what inflow.h/inflow.c's first line says, inflow.c is no longer about ptrace, it is about terminal management. Some other files were unnecessarily including inflow.h, I guess a leftover from the days when inflow.c really was about ptrace. Those inclusions are simply dropped. gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * Makefile.in (HFILES_NO_SRCDIR): Remove inflow.h. * inf-ptrace.c, inflow.c, procfs.c: Don't include "inflow.h". * inflow.h: Delete, moved to gdbsupport/ under a different name. * ser-unix.c: Don't include "inflow.h". Include "gdbsupport/scoped_ignore_sigttou.h". gdbsupport/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * scoped_ignore_sigttou.h: New file, moved from gdb/ and renamed. Change-Id: Ie390abf42c3a78bec6d282ad2a63edd3e623559a
2021-06-17Fix an assertion failure in the AArch64 assembler triggered by incorrect ↵Nick Clifton5-3/+24
instruction syntax. PR 27904 * config/tc-aarch64.c (ldst_lo12_determine_real_reloc_type): Generate a syntax error message if the reloc qualifier does not match the instruction's size.
2021-06-17gas: handle csect in bss section for XCOFFClément Chigot2-3/+14
Latest gcc versions are now generating csects instead of .lcomm for bss symbols. Some adjustements are needed in order to handle them. * config/tc-ppc.c (md_begin): Create bss section with dummy symbol. (ppc_frob_symbol): Output XTY_CM for bss csects. (ppc_fix_adjustable): Adjust condition to avoid bss csects.
2021-06-17gdb/testsuite: gdb.base/args.exp: add KFAIL for native-extended-gdbserverSimon Marchi2-5/+23
This test tests passing arguments made of exactly two single-quotes ('') or a single newline character through the --args argument of GDB. For some reason, GDB adds some extra single quotes when transmitting the arguments to GDBserver. This produces some FAILs when testing with the native-extended-gdbserver board: FAIL: gdb.base/args.exp: argv[2] for one empty (with single quotes) FAIL: gdb.base/args.exp: argv[2] for two empty (with single quotes) FAIL: gdb.base/args.exp: argv[3] for two empty (with single quotes) FAIL: gdb.base/args.exp: argv[2] for one newline FAIL: gdb.base/args.exp: argv[2] for two newlines FAIL: gdb.base/args.exp: argv[3] for two newlines This is documented as PR 27989. Add some appropriate KFAILs. gdb/testsuite/ChangeLog: * gdb.base/args.exp: Check target, KFAIL if remote. (args_test): Add parameter and use it. Change-Id: I49225d1c7df7ebaba480ebdd596df80f8fbf62f0
2021-06-17gdb/testsuite: gdb.base/args.exp: remove trailing parenthesis in test namesSimon Marchi2-2/+6
Some test names end with a parenthesis, we don't want that: https://sourceware.org/gdb/wiki/GDBTestcaseCookbook#Do_not_use_.22tail_parentheses.22_on_test_messages Fix that. gdb/testsuite/ChangeLog: * gdb.base/args.exp: Remove trailing parenthesis in test names. Change-Id: I0306ea202bae3a4ed5bf0bd65e0ab5ed5de52fe1
2021-06-17gdb/testsuite: gdb.base/args.exp: use $old_gdbflags last two testsSimon Marchi2-2/+6
All tests in this file append to GDBFLAGS instead of overwriting it, except the last two. I noticed because when testing with the native-extended-remote board, it removes the "set sysroot" argument, and it causes the test to be very long to run, due to big glibc debug info being read through the remote target. I think this oddity is due to a race condition between these two commits: [1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c22261528c50f7760dd6a2e29314662b377eebb4 [2] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6b8ce727297b1e40738e50f83a75881b290fe6a6 The first one added the two tests. The second one changes the test to append to GDBFLAGS instead of overwriting it. But the second one was probably written before the first one was it, so missed the new tests. Change those two tests to be like the others. gdb/testsuite/ChangeLog: * gdb.base/args.exp: Use $old_gdbflags in all tests. Change-Id: I531276125ecb70e80f52adbd320ebb85b0c8eba0
2021-06-17gdb/testsuite: gdb.base/args.exp: use save_varsSimon Marchi2-29/+31
Use save_vars instead of manually saving/restoring. This ensures that if anything throws an error, GDBFLAGS will be correctly restored. Remove the global GDBFLAGS declaration at the top, it's not necessary. gdb/testsuite/ChangeLog: * gdb.base/args.exp: Use save_vars. Change-Id: I3a45e4fc1635ec0212de2415040f91eecaf4a057
2021-06-17Make the TUI command window support the mousePedro Alves4-52/+186
Currently, when the focus is on the command window, we disable the keypad. This means that when the command window has the focus, keys such as up/down/home/end etc. are not processed by curses, and their escape sequences go straight to readline. A side effect of disabling keypad mode is that wgetch no longer processes mouse escape sequences, with the end result being the mouse doesn't work, and worse, the raw mouse escape sequences are printed on the terminal. This commit makes the TUI command window support the mouse as well, by always enabling the keypad, and then to avoid losing support for up/down browsing the command history, home/end/left/right moving the cursor position, etc., we forward those keys as raw escape sequences to readline. Note we don't make an effort to pass down to readline all keys returned by curses, only the common ones that readline understands by default. Given users can specify their own readline bindings (inputrc file, bind utility), this approach is good in practice, though not 100% transparent or perfect. Note that the patch makes it so that CTLC-L is always passed to readline even if the command window does not have the focus. It was simpler to implement that way, and it just seems correct to me. I don't know of a reason we shouldn't do that. The patch improves the TUI behavior in a related way. Now we can pass special keys to readline irrespective of which window has the focus. First, we try to dispatch the key to a window, via tui_displatch_ctrl_char. If the key is dispatched, then we don't pass it to readline. E.g., pressing "up" when you have the source window in focus results in scrolling the source window, and nothing else. If however, you press ctrl-del instead, that results in killing the next word in the command window, no matter which window has has focus. Before, it would only work if you had the command window in focus. Similarly, ctrl-left/ctrl-right to move between words, etc. Similarly, the previous spot where we handled mouse events was incorrect. It was never reached if the window with focus can't scroll, which is the case for the command window. Mouse scrolling affects the window under the mouse cursor, not the window in focus. We now always try to dispatch mouse events. One last bit in the patch -- now if we don't recognize the non-8-bit curses key, then we don't pass it down to readline at all. Before that would result in bogus characters in the input line. gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * tui/tui-io.c (tui_dispatch_mouse_event): New, factored out from ... (tui_dispatch_ctrl_char): ... this. Move CTRL-L handling to tui_getc_1. (cur_seq, start_sequence): New. (tui_getc_1): Pass key escape sequences for curses control keys to readline. Handle mouse and ctrl-l here. (tui_resize_all): Disable/reenable the keypad if the command window has the focus too. * tui/tui-win.c (tui_set_focus_command): Don't change keypad setting. * tui/tui.c (tui_rl_other_window): Don't change keypad setting. Change-Id: Ie0a7d849943cfb47f4a6589e1c73341563740fa9
2021-06-17gas: ensure sections contents is zero for BFD_RELOC_PPC*_TLSM on XCOFF.Clément Chigot6-5/+107
AIX ld expects the section contents for relocations BFD_RELOC_PPC_TLSM or BFD_RELOC_PPC64_TLSM to be zero. Actually, it seems to be the case for all the TLS relocations generated by AIX assembly but only these two are mandatory. * config/tc-ppc.c (md_apply_fix): Adjust addend to nullify section contents for BFD_RELOC_PPC_TLSM or BFD_RELOC_PPC64_TLSM. * testsuite/gas/ppc/xcoff-tlsm-32.d: New test. * testsuite/gas/ppc/xcoff-tlsm-64.d: New test. * testsuite/gas/ppc/xcoff-tlsm.s: New test. * testsuite/gas/ppc/aix.exp: Run new tests.
2021-06-17powerpc: move cell "or rx,rx,rx" hintsAlan Modra2-5/+10
* ppc-opc.c (powerpc_opcodes): Move cell db*cyc to proper location in table.
2021-06-17sim: mn10300: tweak static inlinesMike Frysinger2-2/+6
Use INLINE2 instead of INLINE to fix builds when -O0 are used -- the latter define is omitted at -O0 levels while the former is always set to inline. These helper funcs are used by defines in here but the defines aren't always called.
2021-06-17sim: split sim/callback.h include outMike Frysinger19-2/+38
The sim-basics.h is too big and includes too many things. This leads to some arch's sim-main.h having circular loop issues with defs, and makes it hard to separate out common objects from arch-specific defs. By splitting up sim-basics.h and killing off sim-main.h, it'll make it easier to separate out the two. Start with splitting out sim/callback.h.
2021-06-17Automatic date update in version.inGDB Administrator1-1/+1
2021-06-16sim: make some rules silent by default in Make-common.inSimon Marchi4-6/+20
Use GDB's silent-rules.mk to make some rules silent by default. These rules cover most of what is built in sim/. gdb/ChangeLog: * silent-rules.mk (ECHO_CCLD, ECHO_AR, ECHO_RANLIB): New. sim/ChangeLog: * common/Make-common.in (COMPILE, libsim.a, run$(EXEEXT), gentmap.o, gentmap): Make rules silent. Change-Id: Idf9ba5beaee10c7c614859ace5fbdcd1de0287db
2021-06-16gdb, doc: Fix missed ChangeLog entry.Felix Willgerodt1-0/+6
My previous commit "btrace, doc: Clarify record function-call-history documentation." didn't add this to the actual ChangeLog file. Fix that.
2021-06-16btrace, doc: Clarify record function-call-history documentation.Felix Willgerodt1-15/+14
The documentation for 'record function-call-history' mentions lines instead of functions when talking about the number of functions printed, as currently there is only one line printed per function. Yet the code actually handles this on function granularity not on line basis. Future patches will extend the number of lines printed per function. This also makes it consistent with the 'record instruction-history' command, where multiple lines can be printed per instruction. gdb/doc/ChangeLog: 2021-06-16 Felix Willgerodt <felix.willgerodt@intel.com> * gdb.texinfo (Process Record and Replay): Stop mentioning lines for "record function-call-history" and "set record function-call-history-size".
2021-06-16[gdb/symtab] Fix infinite recursion in dwarf2_cu::get_builder(), againTom de Vries5-23/+36
This is another attempt at fixing the problem described in commit 4cf88725da1 "[gdb/symtab] Fix infinite recursion in dwarf2_cu::get_builder()", which was reverted in commit 3db19b2d724. First off, some context. A DWARF CU can be viewed as a symbol table: toplevel children of a CU DIE represent symbol table entries for that CU. Furthermore, there is a hierarchy: a symbol table entry such as a function itself has a symbol table containing parameters and local variables. The dwarf reader maintains a notion of current symbol table (that is: the symbol table a new symbol needs to be entered into) in dwarf2_cu member list_in_scope. A problem then presents itself when reading inter-CU references: - a new symbol read from a CU B needs to be entered into the symbol table of another CU A. - the notion of current symbol table is tracked on a per-CU basis. This is addressed in inherit_abstract_dies by temporarily overwriting the list_in_scope for CU B with the one for CU A. The current symbol table is one aspect of the current dwarf reader context that is tracked, but there are more, f.i. ones that are tracked via the dwarf2_cu member m_builder, f.i. m_builder->m_local_using_directives. A similar problem exists in relation to inter-CU references, but a different solution was chosen: - to keep track of an ancestor field in dwarf2_cu, which is updated when traversing inter-CU references, and - to use the ancestor field in dwarf2_cu::get_builder to return the m_builder in scope. There is no actual concept of a CU having an ancestor, it just marks the most recent CU from which a CU was inter-CU-referenced. Consequently, when following inter-CU references from a CU A to another CU B and back to CU A, the ancestors form a cycle, which causes dwarf2_cu::get_builder to hang or segfault, as reported in PR26327. ISTM that the ancestor implementation is confusing and fragile, and should go. Furthermore, it seems that keeping track of the m_builder in scope can be handled simply with a per-objfile variable. Fix the hang / segfault by: - keeping track of the m_builder in scope using a new variable per_obj->sym_cu, and - using it in dwarf2_cu::get_builder. Tested on x86_64-linux (openSUSE Leap 15.2), no regressions for config: - using default gcc version 7.5.0 (with 5 unexpected FAILs) - gcc 10.3.0 and target board unix/-flto/-O0/-flto-partition=none/-ffat-lto-objects (with 1000 unexpected FAILs) gdb/ChangeLog: 2021-06-16 Tom de Vries <tdevries@suse.de> PR symtab/26327 * dwarf2/cu.h (dwarf2_cu::ancestor): Remove. (dwarf2_cu::get_builder): Declare and move ... * dwarf2/cu.c (dwarf2_cu::get_builder): ... here. Use sym_cu instead of ancestor. Assert return value is non-null. * dwarf2/read.c (read_file_scope): Set per_objfile->sym_cu. (follow_die_offset, follow_die_sig_1): Remove setting of ancestor. (dwarf2_per_objfile): Add sym_cu field.
2021-06-16gas: fix hex float parsing from .dcb.? directivesJan Beulich3-71/+75
Unlike for .dc.? the parsing here failed to skip the colon before calling hex_float(). To avoid both variants of parsing going out of sync again, introduce a helper used by both.
2021-06-16gas: fix overflow diagnosticsJan Beulich6-10/+72
While the logic in fixup_segment() so far was off by 1 for fixups dealing with quantities without known signedness, thus failing to report an overflow when e.g. a byte-sized resulting value is -0x100, the logic in emit_expr_with_reloc() reported an overflow even on large negative values when the respective positive ones would not be warned about, and when fixup_segment() wouldn't do so either. Such diagnostics all ought to follow a similar pattern of what value range is acceptable. (If expressions' X_unsigned was reliably set, emit_expr_with_reloc()'s checking might make sense to tighten based on that flag.) Note that with commit 80aab57939a0 ("Changes to let cons handle bignums like general expressions") having added handling of nbytes > sizeof(valueT) in the O_constant case, converting to O_big, the setting to zero of "hibit" had become dead. With "hibit" no longer used, this code now gets dropped altogether. But additionally a respective know() gets inserted.
2021-06-16sim: mips: add printf attribute to trace funcMike Frysinger3-2/+7
This helps catch format errors in code, although they're all clean at this point already.
2021-06-16sim: mips: rework dynamic printf logic to avoid compiler warningsMike Frysinger2-8/+38
The compiler doesn't like passing non-constant strings to printf functions, so tweak the code to always pass one in. This code is a little more verbose, but it's probably the same performance. The macro usage is a bit ugly, but maybe less than copying & pasting the extended conditional format logic.
2021-06-16sim: mips: tweak buffer signMike Frysinger2-1/+6
This model uses unsigned char buffers, but this temporary pointer is declared as signed. Switch it to unsigned since it's just a temporary variable to hold the new pointer.
2021-06-16sim: mips: fix uninitialized register useMike Frysinger2-1/+6
In the default case, this code will read from this variable before it is initialized as a dummy access. Set it to 0 to fix the compiler warning.
2021-06-16sim: drop obsolete AC_EXEEXT callMike Frysinger67-70/+133
The current autoconf 2.69 defines this to nothing because the logic in AC_PROG_CC takes care of it all the time now. Delete the call.
2021-06-16sim: ppc: use common sim-assert settingMike Frysinger4-38/+5
The common sim code already sets this up for us, so no need to duplicate the logic.
2021-06-16sim: ppc: convert to bfd_endianMike Frysinger11-59/+75
Rather than re-invent endian defines, as well as maintain our own list of OS & arch-specific includes, punt all that logic in favor of the bfd ones already set up and maintained elsewhere. We already rely on the bfd library, so leveraging the endian aspect should be fine. This was done for all the other ports years ago, so catch ppc up.
2021-06-16sim: ppc: replace local __attribute__ fallbackMike Frysinger3-15/+7
The common ansidecl.h provides fallbacks for these so we don't need to.
2021-06-16sim: ppc: use common ATTRIBUTE_PRINTF macrosMike Frysinger6-5/+23
Use the common ansidecl.h macros to replace our ad-hoc printf attributes.
2021-06-16sim: ppc: use common ATTRIBUTE_PACKED macroMike Frysinger3-6/+12
Drop local packed attribute with the common ansidecl.h define.
2021-06-16sim: ppc: replace local NORETURN macros with common oneMike Frysinger4-6/+12
Drop local NORETURN macro with the common ansidecl.h ATTRIBUTE_NORETURN define.
2021-06-16sim: ppc: replace local UNUSED macros with common oneMike Frysinger5-96/+97
Drop local UNUSED macro with the common ansidecl.h ATTRIBUTE_UNUSED define.
2021-06-16sim: ppc: replace local CONCAT macros with common onesMike Frysinger6-16/+12
Drop local copies of CONCAT macros that the common ansidecl.h provides.
2021-06-16sim: ppc: change bool variable name to booleanMike Frysinger2-1/+5
This is a reserved type with stdbool.h.
2021-06-16sim: ppc: drop host endian configure optionMike Frysinger12-928/+474
The --enable-sim-hostendian flag was purely so people had an escape route for when cross-compiling. This is because historically, AC_C_BIGENDIAN did not work in those cases. That was fixed a while ago though, so we can require that macro everywhere now and simplify a good bit of code. This was done for all the other ports years ago, so catch ppc up.
2021-06-16sim: mips: fix format warnings when setting up memoryMike Frysinger2-18/+22
The majority of these inputs are not long's, so don't use %lx. This fixes compiler warnings about type mismatches.
2021-06-16sim: drop arch-specific config.hMike Frysinger100-8706/+1478
All of the settings in here are handled by the common top-level config.h, so drop the individual arch-config.h files entirely. This will also help guarantee that we don't add any new arch specific defines that would affect common code which will help with the effort of unifying them.
2021-06-15sim: move dv-sockser define to CPPFLAGSMike Frysinger95-250/+161
This is the only define left in m4/ that is not in the common config.h, so move it to sim_hw_cflags so we can drop the arch-specific config.h.
2021-06-16Automatic date update in version.inGDB Administrator1-1/+1
2021-06-15sim: switch modules.c & version.c to stamp filesMike Frysinger5-7/+26
This fixes remaking of these files and avoids unnecessary rebuilds. Also add both to `make clean` to match other stamp files.
2021-06-15Fix typo in vsx-regs.exp testCarl Love1-1/+1
gdb/ChangeLog 2021-06-15 Carl Love <cel@us.ibm.com> * testsuite/gdb.arch/vsx-regs.exp (gdb_test_no_output): Fix typo in set \$vs$i.v2_double.
2021-06-15Allow readelf to recognise GO buildid notes.Nick Clifton4-0/+11
binutils * readelf.c (get_note_type): Add support for NT_GO_BUILDID. include * elf/common.h (NT_GO_BUILDID): Define.
2021-06-15x86: bring "gas --help" output for --32 etc in sync with realityJan Beulich3-4/+15
The testsuite uses the output to determine whether BFD64 is in effect. --x32 is supported for ELF only; don't advertise it for PE/COFF. --64 is also supported for Mach-O; advertise it. Adjust the testsuite's BFD64 check accordingly. Also replace "code" by "object", since it's the object format that the options primarily control. It's also _initial_ code bitness, but this can be changed by directives.
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