Bug 422683

Summary:	Adjusting AT_PLATFORM
Product:	[Developer tools] valgrind	Reporter:	Mark Wielaard <mark>
Component:	general	Assignee:	Julian Seward <jseward>
Status:	REPORTED ---
Severity:	normal	CC:	fweimer, tuliom
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
URL:	https://sourceware.org/pipermail/libc-alpha/2020-May/113757.html
Latest Commit:		Version Fixed In:

Description Mark Wielaard 2020-06-09 16:59:18 UTC

glibc might start selecting optimized functions/libraries based on the AT_PLATFORM architecture string identifier. We currently adjust the AT_HW_CAPS[2] based on the actual instructions we support (see setup_client_stack in coregrind/m_initimg/initimg-linux.c), but in the future we might also want to adjust AT_PLATFORM (e.g. change power10 -> power9 or z15 -> z13).

The current proposal is on the glibc mailinglist:
https://sourceware.org/pipermail/libc-alpha/2020-May/113757.html

Comment 1 Florian Weimer 2020-06-09 17:02:31 UTC

To clarify that the libc-alpha posting is not a proposal, it is a description of the status quo.

The proposal (buried in there) is to move towards AT_HWCAP-based selection exclusively, but that has not been implemented yet, and would not affect the legacy directory selection logic at first.