Jan Beulich writes ("Re: [PATCH] libxl: fix incremental parallel build"):
> On 04.09.17 at 15:33, wrote:
> > I would like to make a single change which will always work. After
> > all we have no way to automatically verify that we don't have bugs of
> > this form, and when we do write a bug of th
>>> On 04.09.17 at 15:33, wrote:
> I would like to make a single change which will always work. After
> all we have no way to automatically verify that we don't have bugs of
> this form, and when we do write a bug of this form it's a race bug
> (and race bugs are horrible to find and debug).
Wel
Jan Beulich writes ("Re: [PATCH] libxl: fix incremental parallel build"):
> Well, the absolute paths in there are a problem only when compiling
> files from a different subdirectory. Is that something that happens
> in many places?
It seems to be not wholly uncommon in xen.git, primarily because o
>>> On 04.09.17 at 13:33, wrote:
> I have investigated this further and have made the following
> discoveries:
>
> 1. make distinguishes targets purely textually. It will canonicalise a
> target name by removing ./ before comparison (so `foo' and `./foo'
> are considered the same target) but
I have investigated this further and have made the following
discoveries:
1. make distinguishes targets purely textually. It will canonicalise a
target name by removing ./ before comparison (so `foo' and `./foo'
are considered the same target) but it won't examine the filesystem
AFAICT. So
Jan Beulich writes ("Re: [PATCH] libxl: fix incremental parallel build"):
> On 01.09.17 at 19:04, wrote:
> > AFAICT you must mean tools/firmware/hvmloader/.build.o.d ?
>
> No, I mean the libxl instance of the file (remember that the same
> libacpi source file is being compiled twice). The hvmload
>>> On 01.09.17 at 19:04, wrote:
> Jan Beulich writes ("Re: [PATCH] libxl: fix incremental parallel build"):
>> On 01.09.17 at 17:28, wrote:
>> > Do you mean parallel build in which two makes enter libxl? Is that
>> > possible?
>>
>> No, only a single entry into that subtree.
>
> Are you sure ?
Jan Beulich writes ("Re: [PATCH] libxl: fix incremental parallel build"):
> On 01.09.17 at 17:28, wrote:
> > Do you mean parallel build in which two makes enter libxl? Is that
> > possible?
>
> No, only a single entry into that subtree.
Are you sure ?
> > Why does libacpi matter? All dependenci
>>> On 01.09.17 at 17:28, wrote:
> On Wed, Aug 30, 2017 at 01:06:10AM -0600, Jan Beulich wrote:
>> Short-circuit absolute paths of generated headers to their pathless
>> equivalents, to avoid two racing invocations of the same rule producing
>> them.
>>
>> Signed-off-by: Jan Beulich
>> ---
>> Th
On Wed, Aug 30, 2017 at 01:06:10AM -0600, Jan Beulich wrote:
> Short-circuit absolute paths of generated headers to their pathless
> equivalents, to avoid two racing invocations of the same rule producing
> them.
>
> Signed-off-by: Jan Beulich
> ---
> This wants to be backported to 4.9 and 4.8.
>
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