Bug 926264 – dev-embedded/raspberrypi-utils-0_p20240203 fails to compile with LTO

• Status: CONFIRMED
• Product: Gentoo Linux

[Description Jakub Bidžan 2024-03-06 12:52:57 UTC]

Created attachment 886805 [details]
emerge --info and build log of raspberrypi-utils

This package fails to compile on a raspberry pi 5 (Cortex-A76 CPU). Attaching complete build-log and emerge --info

[Comment 1 Sam James 2024-03-06 12:54:21 UTC]

Please try without LTO.

[Comment 2 Jakub Bidžan 2024-03-06 13:03:51 UTC]

I did try with only -O2 and -pipe and got same reult(In reply to Sam James from comment #1)
> Please try without LTO.

tried with only -O2 and -pipe and got the same result

[Comment 3 James Le Cuirot 2024-03-09 15:36:19 UTC]

(In reply to Jakub Bidžan from comment #2)
> tried with only -O2 and -pipe and got the same result

Really? I only get this when I use -flto.

[Comment 4 Sam James 2024-03-09 17:19:36 UTC]

(In reply to Jakub Bidžan from comment #2)
> I did try with only -O2 and -pipe and got same reult(In reply to Sam James
> from comment #1)
> > Please try without LTO.
> 
> tried with only -O2 and -pipe and got the same result

In general, you should give the log for the most simple build failure.

[Comment 5 James Le Cuirot 2024-03-09 21:33:04 UTC]

I've had a look, but I don't know how to deal with this one. Seems like an odd case. Maybe someone with more LTO experience will have a better idea.

[Comment 6 Andrii Batyiev 2024-03-31 01:38:56 UTC]

Created attachment 889082 [details, diff]
proposed fix

I've made a fix and created an issue in upstream tracker: https://github.com/raspberrypi/utils/issues/75
The problem is that LTO aggressively removes sections from object files.