[Scons-users] Tracing the loading of SConscript files

[Stefan Seefeld]

On 23.12.2015 14:23, Bill Deegan wrote:
> Oh.. you're not using variant_dir in your SConscript calls?

I am, as arguments to the VariantDir() constructor.

        Stefan

>
> On Wed, Dec 23, 2015 at 10:37 AM, Stefan Seefeld <stefan at seefeld.name
> <mailto:stefan at seefeld.name>> wrote:
>
>     On 23.12.2015 12 <tel:23.12.2015%2012>:56, Bill Deegan wrote:
>     > Stefen,
>
>     Bill,
>
>     thanks for the quick reply !
>
>     >
>     > First I'd try --debug=stacktrace
>     > See if that yields you anything.
>
>     That shows me where the error was raised, and allowed me to inject
>     print
>     statements into the FS.VariantDir() method (as well as my
>     SConscript files).
>     Now, when I run `scons -n` I see:
>
>     scons: Reading SConscript files ...
>     invoking VariantDir(src_dir=".",
>     variant_dir=#/bin.SCons/libs/release/dynamic/threading-multi,
>     duplicate=False
>     VariantDir(variant-dir=threading-multi, source_dir=boost.python)
>     invoking VariantDir(src_dir=./build, variant_dir=./src,
>     duplicate=False
>     VariantDir(variant-dir=src, source_dir=build)
>     Checking for C header file Python.h... (cached) yes
>     invoking VariantDir(src_dir=".",
>     variant_dir=#/bin.SCons/libs/release/static/threading-multi,
>     duplicate=False
>     VariantDir(variant-dir=threading-multi, source_dir=boost.python)
>     invoking VariantDir(src_dir=./build, variant_dir=./src,
>     duplicate=False
>     VariantDir(variant-dir=src, source_dir=build)
>     scons: done reading SConscript files.
>     ...
>
>     However, when I run `scons --test -n` I get:
>
>     scons: Reading SConscript files ...
>     invoking VariantDir(src_dir=".",
>     variant_dir=#/bin.SCons/libs/release/dynamic/threading-multi,
>     duplicate=False
>     VariantDir(variant-dir=threading-multi, source_dir=boost.python)
>     invoking VariantDir(src_dir=./build, variant_dir=./src,
>     duplicate=False
>     VariantDir(variant-dir=src, source_dir=build)
>     Checking for C header file Python.h... (cached) yes
>     invoking VariantDir(src_dir=".",
>     variant_dir=#/bin.SCons/libs/release/static/threading-multi,
>     duplicate=False
>     VariantDir(variant-dir=threading-multi, source_dir=.)
>
>     scons: *** Source directory cannot be under variant directory.
>
>     Notice the "source_dir=." in the last VariantDir invocation, which
>     differs from the equivalent call of `scons -n` above (i.e.,
>     without --test`.
>     There is an additional SConscript file that's loaded with --test,
>     and I
>     verified that if I don't read that (i.e., invoke 'Return()' above
>     everything else), I don't get the error. This suggests that
>     somehow the
>     content of that SConscript file might have corrupted the internal
>     state
>     of the build system, and I need to figure out what. (That SConscript
>     file is here:
>     https://github.com/stefanseefeld/boost.python/blob/scons/test/SConscript)
>
>     >
>     > Can you provide a simple set of SConstruct/SConscripts which
>     > reproduces this?
>
>     I may try to reduce the problem to something manageable. For now I
>     have
>     checked in the full set of build scripts into my boost.python repo
>     (the
>     "scons" branch), which you can find (and clone) here:
>     https://github.com/stefanseefeld/boost.python/tree/scons
>
>     And a related question: What is the exact semantic of the 'VariantDir'
>     function ? I understand the general purpose, but I'm not sure what it
>     specifically does, in particular if I invoke it multiple times one
>     after
>     another. Is the effect accumulated (say, the variant_dir values are
>     concatenated) ? Or does the second override the former ?
>
>     Thanks,
>             Stefan
>
>     --
>
>           ...ich hab' noch einen Koffer in Berlin...
>
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      ...ich hab' noch einen Koffer in Berlin...