Messages in this thread | | | Date | Wed, 30 Nov 2016 13:28:42 -0500 | From | Prarit Bhargava <> | Subject | Re: Odd build breakage in 4.9-rc7 |
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On 11/30/2016 01:18 PM, Linus Torvalds wrote: > On Wed, Nov 30, 2016 at 9:24 AM, Jarod Wilson <jarod@redhat.com> wrote: >> >> Now, if I omit the -j8 and do a single-threaded build, then things work >> fine. Prarit bisected this failure to commit >> 9a6fb28a355d2609ace4dab4e6425442c647894d, and indeed, when reverting that >> patch and the two that follow it from rc7, parallel make works again. > > I seriously doubt that commit really makes a difference, and I think > it was just random luck. > > Do you perhaps have ccache installed? > > Because ccache at some point broke dependency generation of "gcc -MM" > that the kernel build system uses, giving those random "No such file" > build errors. > > Try uninstalling ccache and see if that helps. >
I reported this last week on LKML and I'm building on a freshly installed systems that do not have ccache installed.
For example,
[root@intel-brickland-04 linux]# rpm -q ccache package ccache is not installed [root@intel-brickland-04 linux]# which ccache /usr/bin/which: no ccache in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/libexec/git-core:/root/bin)
In my case I tracked this to commit 3637efb00864 ("x86/mce: Add PCI quirks to identify Xeons with machine check recovery") which adds the include for generated/autoksyms.h.
Searching LKML and I came across a report from Ken Moffat from a month ago:
http://marc.info/?l=linux-kernel&m=147794681124332&w=2
Also cc'ing linux-kbuild.
P.
> Linus >
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