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From cebc89b9328eab994f6b0314c263f94e7949a553 Mon Sep 17 00:00:00 2001
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From: Alan Modra <amodra@gmail.com>
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Date: Mon, 21 Feb 2022 10:58:57 +1030
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Subject: [PATCH] binutils 2.38 vs. ppc32 linux kernel
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Commit b25f942e18d6 made .machine more strict. Weaken it again.
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* config/tc-ppc.c (ppc_machine): Treat an early .machine specially,
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keeping sticky options to work around gcc bugs.
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---
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gas/config/tc-ppc.c | 25 ++++++++++++++++++++++++-
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1 file changed, 24 insertions(+), 1 deletion(-)
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diff --git a/gas/config/tc-ppc.c b/gas/config/tc-ppc.c
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index 054f9c72161..89bc7d3f9b9 100644
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--- a/gas/config/tc-ppc.c
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+++ b/gas/config/tc-ppc.c
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@@ -5965,7 +5965,30 @@ ppc_machine (int ignore ATTRIBUTE_UNUSED)
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options do not count as a new machine, instead they add
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to currently selected opcodes. */
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ppc_cpu_t machine_sticky = 0;
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- new_cpu = ppc_parse_cpu (ppc_cpu, &machine_sticky, cpu_string);
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+ /* Unfortunately, some versions of gcc emit a .machine
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+ directive very near the start of the compiler's assembly
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+ output file. This is bad because it overrides user -Wa
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+ cpu selection. Worse, there are versions of gcc that
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+ emit the *wrong* cpu, not even respecting the -mcpu given
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+ to gcc. See gcc pr101393. And to compound the problem,
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+ as of 20220222 gcc doesn't pass the correct cpu option to
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+ gas on the command line. See gcc pr59828. Hack around
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+ this by keeping sticky options for an early .machine. */
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+ asection *sec;
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+ for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
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+ {
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+ segment_info_type *info = seg_info (sec);
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+ /* Are the frags for this section perturbed from their
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+ initial state? Even .align will count here. */
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+ if (info != NULL
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+ && (info->frchainP->frch_root != info->frchainP->frch_last
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+ || info->frchainP->frch_root->fr_type != rs_fill
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+ || info->frchainP->frch_root->fr_fix != 0))
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+ break;
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+ }
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+ new_cpu = ppc_parse_cpu (ppc_cpu,
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+ sec == NULL ? &sticky : &machine_sticky,
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+ cpu_string);
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if (new_cpu != 0)
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ppc_cpu = new_cpu;
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else
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--
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2.37.1
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