Fix contrib/juliac.jl: enable --experimental option if --trim option is passed to juliac.jl

[terasakisatoshi]

This PR fixes the static_call_graph_arg function in contrib/juliac.jl. If we use --trim option, we must use it with --experimental flag.

julia/src/jloptions.c

Line 989 in 522f496

jl_errorf("julia: --trim is an experimental feature, you must enable it with --experimental");

[fredrikekre]

See #56602

[giordano]

Side note, can we please have a more descriptive title (like #56602)? It's very much unclear from the title alone what's being fixed or why.

[terasakisatoshi]

I'm sorry. 😢

Here is why this PR was created. I'm using juliac.jl to build an executable or shared library. Using --trim option is helpful to reduce the size of binary. One day, julia +nightly juliac.jl --trim ... did not work suddenly. I decided it check source code to resolve the issue. I found

julia/src/jloptions.c

Line 989 in 522f496

jl_errorf("julia: --trim is an experimental feature, you must enable it with --experimental");

is added at some point. As of yesterday, fixing the static_call_graph_arg was a easy solution to me.

Today I found providing --experimental option to the below is another option...

julia/contrib/juliac.jl

Lines 13 to 23 in 0bedaae

	help = findfirst(x->x == "--help", ARGS)
	if help !== nothing
	println(
	"""
	Usage: julia juliac.jl [--output-exe | --output-lib | --output-sysimage] <name> [options] <file.jl>
	--trim=<no,safe,unsafe,unsafe-warn> Only output code statically determined to be reachable
	--compile-ccallable Include all methods marked `@ccallable` in output
	--verbose Request verbose output
	""")
	exit(0)
	end

If one feel my PR is a duplicate of #56602 , feel free to close this issue PR.