pkgs/development/tools/misc/binutils/2.38/ppc-make-machine-less-strict.patch

   1 From cebc89b9328eab994f6b0314c263f94e7949a553 Mon Sep 17 00:00:00 2001
   2 From: Alan Modra <amodra@gmail.com>
   3 Date: Mon, 21 Feb 2022 10:58:57 +1030
   4 Subject: [PATCH] binutils 2.38 vs. ppc32 linux kernel
   5
   6 Commit b25f942e18d6 made .machine more strict.  Weaken it again.
   7
   8         * config/tc-ppc.c (ppc_machine): Treat an early .machine specially,
   9         keeping sticky options to work around gcc bugs.
  10 ---
  11  gas/config/tc-ppc.c | 25 ++++++++++++++++++++++++-
  12  1 file changed, 24 insertions(+), 1 deletion(-)
  13
  14 diff --git a/gas/config/tc-ppc.c b/gas/config/tc-ppc.c
  15 index 054f9c72161..89bc7d3f9b9 100644
  16 --- a/gas/config/tc-ppc.c
  17 +++ b/gas/config/tc-ppc.c
  18 @@ -5965,7 +5965,30 @@ ppc_machine (int ignore ATTRIBUTE_UNUSED)
  19              options do not count as a new machine, instead they add
  20              to currently selected opcodes.  */
  21           ppc_cpu_t machine_sticky = 0;
  22 -         new_cpu = ppc_parse_cpu (ppc_cpu, &machine_sticky, cpu_string);
  23 +         /* Unfortunately, some versions of gcc emit a .machine
  24 +            directive very near the start of the compiler's assembly
  25 +            output file.  This is bad because it overrides user -Wa
  26 +            cpu selection.  Worse, there are versions of gcc that
  27 +            emit the *wrong* cpu, not even respecting the -mcpu given
  28 +            to gcc.  See gcc pr101393.  And to compound the problem,
  29 +            as of 20220222 gcc doesn't pass the correct cpu option to
  30 +            gas on the command line.  See gcc pr59828.  Hack around
  31 +            this by keeping sticky options for an early .machine.  */
  32 +         asection *sec;
  33 +         for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
  34 +           {
  35 +             segment_info_type *info = seg_info (sec);
  36 +             /* Are the frags for this section perturbed from their
  37 +                initial state?  Even .align will count here.  */
  38 +             if (info != NULL
  39 +                 && (info->frchainP->frch_root != info->frchainP->frch_last
  40 +                     || info->frchainP->frch_root->fr_type != rs_fill
  41 +                     || info->frchainP->frch_root->fr_fix != 0))
  42 +               break;
  43 +           }
  44 +         new_cpu = ppc_parse_cpu (ppc_cpu,
  45 +                                  sec == NULL ? &sticky : &machine_sticky,
  46 +                                  cpu_string);
  47           if (new_cpu != 0)
  48             ppc_cpu = new_cpu;
  49           else
  50 --
  51 2.31.1