[Scons-users] How to debug problems?

[Bill Deegan]

--tree=prune is one place to look

--taskmastertrace=FILE can help, but it's complicated to understand
what's going on.  As it's dumping debug info from the guts of SCons


Also are you doing Glob()'s?
That can explain why the first run has issues (file not actually there),
and the second run completes.

Are there any SideEffect files with this builder? (or any builders in your
system)

Can you share your builder?
Or a small test case which reproduces?



On Mon, Aug 28, 2017 at 8:50 AM, Mats Wichmann <mats at wichmann.us> wrote:

>
> Folks, I'm just going insane with errors popping up... I've been trying
> to do a weekly push to Coverity for static checking, and this has failed
> today.
>
> On restarting the build with some debug options added, it doesn't fail,
> but I get some new surprising commentary. ??? if it fails, it should
> keep failing, no?
>
> Yeah, the rules to generate a .dat file are relatively new and clearly
> they're causing some problems (before, people who made changes to the
> json files they come from were supposed to regen and check in the .dat
> file, and they always forgot to do so, so someone added a builder).  But
> in the dep cycle complaints, it's not just .dat files, and that
> complaint is only for one of a number of such files. But I can't see
> what is wrong with that builder, and other people doing builds don't
> seem to be running into this fail. Which is even more of a head-scratcher.
>
> So I'm looking for advice on how you debug when running into these kinds
> of outputs. For once I'm not finding stackexchange useful, it seems to
> point to old information that "has been fixed" (e.g.
> http://scons.tigris.org/issues/show_bug.cgi?id=2116), running 2.5.1 here.
>
> Thanks for any debugging best-practices!
>
>
> Initial run, normal options I've used several times before:
> ===
>
> scons: *** Found dependency cycle(s):
>   Internal Error: no cycle found for node
> out/linux/x86_64/debug/resource/IPCA/samples/ElevatorServer/
> ElevatorServerSecurityDB.dat
> (<SCons.Node.FS.File object at 0x3ae4ff04a0>) in state pending
>   Internal Error: no cycle found for node
> out/linux/x86_64/debug/java/base/objs (<SCons.Node.FS.File object at
> 0x3ae51a6eb0>) in state pending
>   Internal Error: no cycle found for node
> out/linux/x86_64/debug/java/examples-java/simpleclient/jar
> (<SCons.Node.FS.File object at 0x3ae51e3fe0>) in state pending
>
> ===
> Restart, adding "--debug=duplicate,explain,prepare":
> ===
>
> ...
>
> BUILD SUCCESSFUL
>
> Total time: 2.527 secs
> scons: Cannot explain why
> `java/examples-java/simpleserver/build/libs/oic_svr_db_server.dat' is
> being rebuilt: No previous build information found
> Preparing target
> java/examples-java/simpleserver/build/libs/oic_svr_db_server.dat...
> dup: removing existing target
> java/examples-java/simpleserver/build/libs/oic_svr_db_server.dat
> scons: Cannot explain why
> `java/examples-java/simpleclientserver/build/libs/oic_svr_db_server.dat'
> is being rebuilt: No previous build information found
> Install file:
> "java/examples-java/simpleserver/src/main/assets/oic_svr_db_server.dat"
> as "java/examples-java/simpleserver/build/libs/oic_svr_db_server.dat"
> Preparing target
> java/examples-java/simpleclientserver/build/libs/oic_svr_db_server.dat...
> dup: removing existing target
> java/examples-java/simpleclientserver/build/libs/oic_svr_db_server.dat
> Preparing target out/linux/x86_64/debug/java/examples-java/simpleclient...
> Install file:
> "java/examples-java/simpleserver/src/main/assets/oic_svr_db_server.dat"
> as "java/examples-java/simpleclientserver/build/libs/
> oic_svr_db_server.dat"
>
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