Precompilation breaks for non-native target

[nlw0]

Hi. I'm trying to do something weird, not really sure how it works, but it seems this package is the only one where an issue appears, so I'm hoping I might at least learn a bit more about how things work.

I have a Julia application that runs in the cloud. My local development machine is not the exact same Sys.CUP_NAME as the remote machine. I believe that as a result, even thought I have my app pre-compiled in a Docker container, it needs to be pre-compiled again when it gets deployed.

I was hoping that setting julia -C core-avx2 or something like that might allow me to easily circumvent the issue. When I try doing that, though, I run into this error during pre-compilation. Is there any work around that, or is it not really reasonable?

ERROR: LoadError: InitError: Evaluation into the closed module `HostCPUFeatures` breaks incremental compilation because the side effects will not be permanent. This is likely due to some other module mutating `HostCPUFeatures` with `eval` during precompilation - don't do this.
Stacktrace:
  [1] eval
    @ ./boot.jl:370 [inlined]
  [2] setfeaturefalse(s::Symbol)
    @ HostCPUFeatures ~/.julia/packages/HostCPUFeatures/9sAqs/src/cpu_info_x86.jl:36
  [3] make_generic(target::String)
    @ HostCPUFeatures ~/.julia/packages/HostCPUFeatures/9sAqs/src/cpu_info_x86.jl:73
  [4] __init__()
    @ HostCPUFeatures ~/.julia/packages/HostCPUFeatures/9sAqs/src/HostCPUFeatures.jl:45
  [5] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
    @ Base ./loading.jl:1074
  [6] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{Any})
    @ Base ./loading.jl:1020
  [7] _tryrequire_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String)
    @ Base ./loading.jl:1407
  [8] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:1781
  [9] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:1625
 [10] macro expansion
    @ ./loading.jl:1613 [inlined]
 [11] macro expansion
    @ ./lock.jl:267 [inlined]
 [12] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:1576
 [13] include
    @ ./Base.jl:457 [inlined]
 [14] include_package_for_output(pkg::Base.PkgId, input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId, UInt128}}, source::String)
    @ Base ./loading.jl:2010
 [15] top-level scope
    @ stdin:2
during initialization of module HostCPUFeatures
in expression starting at /home/user/.julia/packages/VectorizationBase/e4FnQ/src/VectorizationBase.jl:1
in expression starting at stdin:2
ERROR: LoadError: Failed to precompile VectorizationBase [3d5dd08c-fd9d-11e8-17fa-ed2836048c2f] to "/home/user/.julia/compiled/v1.9/VectorizationBase/jl_JLOYjx".
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] compilecache(pkg::Base.PkgId, path::String, internal_stderr::IO, internal_stdout::IO, keep_loaded_modules::Bool)
    @ Base ./loading.jl:2260
  [3] compilecache
    @ ./loading.jl:2127 [inlined]
  [4] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:1770
  [5] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:1625
  [6] macro expansion
    @ ./loading.jl:1613 [inlined]
  [7] macro expansion
    @ ./lock.jl:267 [inlined]
  [8] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:1576
  [9] include
    @ ./Base.jl:457 [inlined]
 [10] include_package_for_output(pkg::Base.PkgId, input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId, UInt128}}, source::String)
    @ Base ./loading.jl:2010
 [11] top-level scope
    @ stdin:2
in expression starting at /home/user/.julia/packages/LoopVectorization/DDH6Z/src/LoopVectorization.jl:1
in expression starting at stdin:2
ERROR: LoadError: Failed to precompile LoopVectorization [bdcacae8-1622-11e9-2a5c-532679323890] to "/home/user/.julia/compiled/v1.9/LoopVectorization/jl_gmjndJ".
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
...

[chriselrod]

PRs that fixes this would be welcome. You could look into using Preferences in CPUsummary and especially HostCPUFeatures.