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binutils 2.38 vs. ppc32 linux kernel

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Commit b25f942e18d6 made .machine more strict.  Weaken it again.

	* config/tc-ppc.c (ppc_machine): Treat an early .machine specially,
	keeping sticky options to work around gcc bugs.
This commit is contained in:
Alan Modra
2022-02-21 10:58:57 +10:30
parent 9cbed90ee6
commit cebc89b932
1 changed files with 24 additions and 1 deletions
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25
gas/config/tc-ppc.c
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@ -5965,7 +5965,30 @@ ppc_machine (int ignore ATTRIBUTE_UNUSED)
options do not count as a new machine, instead they add
to currently selected opcodes. */
ppc_cpu_t machine_sticky = 0;
new_cpu = ppc_parse_cpu (ppc_cpu, &machine_sticky, cpu_string);
/* Unfortunately, some versions of gcc emit a .machine
directive very near the start of the compiler's assembly
output file. This is bad because it overrides user -Wa
cpu selection. Worse, there are versions of gcc that
emit the *wrong* cpu, not even respecting the -mcpu given
to gcc. See gcc pr101393. And to compound the problem,
as of 20220222 gcc doesn't pass the correct cpu option to
gas on the command line. See gcc pr59828. Hack around
this by keeping sticky options for an early .machine. */
asection *sec;
for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
{
segment_info_type *info = seg_info (sec);
/* Are the frags for this section perturbed from their
initial state? Even .align will count here. */
if (info != NULL
&& (info->frchainP->frch_root != info->frchainP->frch_last
|| info->frchainP->frch_root->fr_type != rs_fill
|| info->frchainP->frch_root->fr_fix != 0))
break;
}
new_cpu = ppc_parse_cpu (ppc_cpu,
sec == NULL ? &sticky : &machine_sticky,
cpu_string);
if (new_cpu != 0)
ppc_cpu = new_cpu;
else