On 12/6/21 14:27, Greg KH wrote:
On Mon, Dec 06, 2021 at 02:24:29PM +0100, Thomas Lindroth wrote:
On 12/6/21 14:04, Greg KH wrote:
On Mon, Dec 06, 2021 at 01:59:31PM +0100, Thomas Lindroth wrote:
Build support for gcc-plugins are not detected with gcc-11 in lts kernels.
Gentoo and Arch apply their own patch to fix the problem in their distribution
kernels but I would prefer if a proper fix was applied upstream.
https://bugs.gentoo.org/814200 a gentoo report with the relevant info.
I've searched for any upstream discussions about the problem but I've only found
one message saying the backport needs an additional fix. That was almost a year
ago. https://www.spinics.net/lists/stable/msg438000.html
We can not take a patch in a stable kernel release unless it is already
in Linus's tree. Please work to get a patch accepted there first,
before worrying about older kernel versions.
thanks,
greg k-h
The problem was fixed in Linus tree in commit 67a5a68013056cbcf0a647e36cb6f4622fb6a470
"gcc-plugins: fix gcc 11 indigestion with plugins..." added in v5.11
That's the patch that needed some kind of additional fix before it could be backported
but that fix never materialized.
If you have a working version, based on a distro's use, please provide
it and I will be glad to pick it up.
thanks,
greg k-h
https://dev.gentoo.org/~mpagano/genpatches/trunk/5.10/2910_fix-gcc-detection-method.patch
Here is the patch gentoo applies to 5.10. It seems to be a combination of two upstream
commits:
67a5a68013056cbcf0a647e36cb6f4622fb6a470 "gcc-plugins: fix gcc 11 indigestion with plugins..."
1e860048c53ee77ee9870dcce94847a28544b753 "gcc-plugins: simplify GCC plugin-dev capability test"
I can't vouch for the correctness of that fix. I'm just a regular user who stumbled upon this
problem and found that gentoo bug report. Check with Kees Cook for that "additional fix". I
don't know what fix that is.
/Thomas Lindroth
