Takafumi Arakaki

Here is an illustrative session (with a95568187a8b0d71b670b472eeeb3847e4f612c8 and https://github.com/tkf/PyPreferences.jl/commit/7006f6c18d7482eda9d1b093c531f1340423d08d). Suppose I have two projects: ```julia shell> cat py37/Project.toml [deps] PyCall = "438e738f-606a-5dbb-bf0a-cddfbfd45ab0" PyPreferences = "cc9521c6-0242-4dda-8d66-c47a9d9eec02" shell> cat py38/Project.toml [deps] PyCall...

I suppose we'd want to have a shared/global preferences persists across Julia and PyCall versions (exactly like `~/.julia/prefs/PyCall`) as a fallback of per-project preference, right? The current design of CompilePreferences.jl...

I don't know if @stevengj looked into the implementation (as I posted it as a WIP), but I think we agree with the idea around this. The last time I...

I don't mind if this PR is discarded, but I think it'd be better to separate the preference package. This is because it'd be much easier if the user can...

It looks like PackageCompiler.jl itself is not testing with nightly at the moment https://github.com/JuliaLang/PackageCompiler.jl/commit/81a01d37e008228542068c58e9882a65525b4010

Can the ABI incompatibility be detected before segfault? Does Julia have runtime access for the build option `USE_BLAS64`? What about for Numpy? It would be nice if we can print...

It's strange that PyCall is trying to use `C:\Users\PAOLOP~1\AppData\Local\Temp\python.exe` while this Python is supposed to be from conda. * What is the value of `using Conda; Conda.PYTHONDIR`? You may need...

Output of ```julia using Conda @info( "Conda.jl configuration", Conda.ROOTENV, Conda.MINICONDA_VERSION, Conda.deps_file, Conda.PREFIX, Conda.BINDIR, Conda.LIBDIR, Conda.SCRIPTDIR, Conda.PYTHONDIR, Conda.conda, Conda.CONDARC, ) Conda.runconda(`info`) ``` may be useful.

What is your `DEPOT_PATH` (a variable available in Julia REPL)? If that does not have any suspicious paths, maybe removing `C:\Users\necka\.juliapro\JuliaPro_v1.1.0.1\packages\Conda\CpuvI\src\..\deps\deps.jl` and then re-running `Pkg.build("Conda")` can fix it.

@stevengj Maybe it's unsafe to remove `Conda.ROOTENV` as it's `C:\Users\...\AppData\Local\Temp\` here? Some applications may be storing some temporary data there and deleting it could potentially corrupt their state? (I'm assuming...