Re: [PATCH v2] arch: fix broken BuildID for arm64 and riscv

On Jan 05 2023, Masahiro Yamada wrote:

I do not understand why 99cb0d917ffa affected this.


I submitted a fix to shoot the error message "discarded section .exit.text"

https://lore.kernel.org/all/20230105031306.1455409-1-masahiroy@kernel.org/T/#u (local)

I do not understand the binutils commit either,
but it might have made something good
because EXIT_TEXT appears twice, in .exit.text, and /DISCARD/.

I think the issue is that the introdution of a second /DISCARD/
directive early in script changes the order of evaluation of the other
/DISCARD/ directive when binutils < 2.36 is used, so that the missing
RUNTIME_DISCARD_EXIT started to become relevant.  As long as /DISCARD/
only appears last, the effect of EXIT_TEXT inside it is always
overridden by its occurence in the .exit.exit output section directive.
When another /DISCARD/ occurs early (and binutils < 2.36 is used) the
effect of EXIT_TEXT inside the second /DISCARD/ (when merged with the
first) overrides its occurence in the .exit.text directive.  The
binutils commit changed that because the new /DISCARD/ directive no
longer affects the order of evaluation of the rest of the directives.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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