[Scons-users] scons-local-2.5.1 build and clean shows random failure

[Bill Deegan]

Which version of Python?
What operating system? (mac, linux, windows?)

Do you have any custom Builders?

Try using
--taskmastertrace=*file*

Prints trace information to the specified *file* about how the internal
Taskmaster object evaluates and controls the order in which Nodes are
built. A file name of *-* may be used to specify the standard output.

And pastebin the output.

Also anything unusual in --tree=prune ?

-Bill

On Fri, Jul 21, 2017 at 5:17 PM, Hua Yanghao <huayanghao at gmail.com> wrote:

> Dear Scons User,
> I am recently experiencing some random failures in both scons build
> and scons clean (-c).
>
> Unfortunately the project has more than 2000 .c/.h files and I cannot
> create a minimal project to reproduce this issue.
>
> Error message: (scons -c)
> Removed output/linux64_full/libusw.a
> Removed output/linux64_full/cmdlist.txt
> scons: done cleaning targets.
>
> scons: *** Found dependency cycle(s):
>   Internal Error: no cycle found for node output/linux64_full
> (<SCons.Node.FS.Dir object at 0x5630bcf78c60>) in state pending
>
> File "/home/hua/git/usw/tools/scons-local-2.5.1/SCons/Taskmaster.py",
> line 1043, in cleanup
>
> End of error message.
>
> This issue can be reproduced one out of five runs, could happen in
> both scons build and scons clean.
> This issue happens *only* with parallel builds (-j8), and cannot
> reproduce with single thread build.
> The project uses scons VariantDir() and many custom builders.
>
> In file SCons/Taskmaster.py, if I simply add a "return" on line 1033,
> the problem cannot be reproduced anymore, and builds are fine all the
> time (checked many dozens of times):
> 1033         return # <--------- This line "fixed" the issue ;-)
> 1034         desc = 'Found dependency cycle(s):\n'
> 1035         for node, cycle in nclist:
> 1036             if cycle:
> 1037                 desc = desc + "  " + " -> ".join(map(str, cycle)) +
> "\n"
> 1038             else:
> 1039                 desc = desc + \
> 1040                     "  Internal Error: no cycle found for node %s
> (%s) in state %s\n" %  \
> 1041                     (node, repr(node), StateString[node.get_state()])
> 1042
> 1043         raise SCons.Errors.UserError(desc)
>
> Does anyone had similar experience? Is scons over-checking something
> and made a false alarm?
> I am about to promote scons to a much wider audience but this issue
> really makes me a little bit nervous.
>
> Thanks a lot for your help,
> Yanghao
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>
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