PROGRAM_FILE not set when compiled through juliac.jl

[NHDaly]

Base.PROGRAM_FILE is empty when compiled through juliac.jl. (The global ARGS is empty, which is where PROGRAM_FILE is set from.)

PROGRAM_FILE is set here, by popping the first value off of ARGS, iff ARGS is not empty (checked here).

Currently, the default program.c skips setting the global ARGS, opting instead to pass an Array to julia_main. This means that there is no way to access PROGRAM_FILE from compiled code.

[NHDaly]

Here is an example:

# examples/args.jl

foo() = println("ARGS: $ARGS")  # Sometimes code accesses ARGS directly, as a global

# Create a temporary .html file, and open it to share the greetings.
Base.@ccallable function julia_main(args::Vector{String})::Cint
    println("@__DIR__: $(@__DIR__)")
    println("@__FILE__: $(@__FILE__)")
    println("PROGRAM_FILE: $(PROGRAM_FILE)")
    foo()  # access global ARGS
    return 0
end

julia_main(["a b c"])

$ julia examples/args.jl d e f
@__DIR__: /Users/daly/src/build-jl-app-bundle/examples
@__FILE__: /Users/daly/src/build-jl-app-bundle/examples/args.jl
PROGRAM_FILE: examples/args.jl
ARGS: String["d", "e", "f"]  # NOTE: these are the command line args, not the inputs to `julia_main()`.

$ julia ~/.julia/v0.6/PackageCompiler/juliac.jl -v -a -e examples/args.jl && ./builddir/args d e f
...
@__DIR__: /Users/daly/src/build-jl-app-bundle/examples    # Note these are not a viable replacement (compile-time macros)
@__FILE__: /Users/daly/src/build-jl-app-bundle/examples/args.jl
PROGRAM_FILE:
ARGS: String[]

[NHDaly]

I tried calling jl_set_ARGS(argc, argv) in program.c, but no matter where I put the call (before libsupport_init, before julia_init, before julia_main), I couldn't get it to work. Any ideas why? The repl uses jl_set_ARGS to set ARGS (here).

Also, I even tried setting PROGRAM_FILE manually through jl_set_global(jl_core_module, jl_symbol("PROGRAM_FILE"), (jl_value_t*)jl_cstr_to_string(argv[0]));, but it was still empty, which really surprised me.

Does anyone have suggestions?

[NHDaly]

Also, I even tried setting PROGRAM_FILE manually through jl_set_global(jl_core_module, jl_symbol("PROGRAM_FILE"), (jl_value_t*)jl_cstr_to_string(argv[0]));, but it was still empty, which really surprised me.

Ah, okay, I was using the wrong module. I fixed it by adding that line, but using jl_base_module, to a custom program.c:
NHDaly/ApplicationBuilder.jl@95098a4#diff-0e48c24b6c52db1e06db58eb5c62d917R48

Although this seems like kind of a hack, since ARGS still isn't available as a global. For whatever reason I couldn't get jl_set_global to work for ARGS.

If you all think it's reasonable, I'm happy to send a PR to add this to examples/program.c, but that doesn't feel like a complete solution to me...

[NHDaly]

@lucatrv: I'm interested in your thoughts here as well. Do you have any idea how we could set global ARGS and/or PROGRAM_FILE?

Does the method I used in my custom program.c, above seem like a hack, or should I send a PR to add it to this repo's examples/program.c?

I hope your travel was nice!! 😄

[lucatrv]

I think we can add the fix for PROGRAM_FILE = argv[0], since we already pass all the following argv elements to julia_main.

Yes my travel to Japan was very nice, thanks!!

[NHDaly]

Oh wowwwww i've always wanted to go to japan!!! That's excellent! :)

(opened PR #57)

[NHDaly]

Fixed in #57