RNG not being seeded during precompilation

[IanButterworth]

Maybe this needs to be moved to julia issues.

On nightly the following is failing

PackageCompiler.jl/examples/MyApp/src/MyApp.jl

Lines 73 to 74 in 8d71b02

	# Check that the RNG is seeded during precompilation
	println("myrand: ", myrand == 0.0 ? "fail" : "ok")

where myrand is a const in the module

PackageCompiler.jl/examples/MyApp/src/MyApp.jl

Line 14 in 8d71b02

const myrand = rand()

See https://github.com/JuliaLang/PackageCompiler.jl/actions/runs/3857713317/jobs/6575476152

@vchuravy is this known?

[IanButterworth]

I guess #756 would fix this in PackageCompiler, but it might be an upstream bug?

[IanButterworth]

I can't reproduce this in basic julia master without a custom sysimage of the app

julia> using MyApp
[ Info: Precompiling MyApp [f943f3d7-887a-4ed5-b0c0-a1d6899aa8f5]
  Downloaded artifact: MKL

julia> MyApp.myrand
0.6190234895057138

julia> using MyApp

julia> MyApp.myrand
0.6190234895057138

[KristofferC]

This indicates to me that the precompile file of MyApp is not used but instead that the using MyApp in the process that creates the sysimage is getting compiled there. So we could maybe add ENV["JULIA_DEBUG"] to the process creating the sysimage and see if the ji file indeed gets loaded or if it gets rejected for some reason.

[IanButterworth]

Ok, pushed to #757 Feel free to push etc.

[IanButterworth]

Setting ENV["JULIA_DEBUG"]="loading" in #757 shows the cache files are being rejected, for instance

┌ Debug: Rejecting cache file /tmp/jl_aCrjdm/compiled/v1.9/LibSSH2_jll/K6mup_TmZuG.ji for LibSSH2_jll [29816b5a-b9ab-546f-933c-edad1886dfa8] since the flags are mismatched
│   cachefile_flags = 35
│   current_flags = 51
└ @ Base loading.jl:2526

It'd be good for that log to be more informative: JuliaLang/julia#48168