Update juliac demo

juliac requires an @main function now.

Author: oschulz

juliac/hepexample.jl

@@ -1,5 +1,3 @@
-module RunHEPExample
-
 using HEPExampleProject
 using Random
 
@@ -22,7 +20,7 @@ function print_values(output::IO, evt::Event)::Nothing
     return print(output, weight)
 end
 
-Base.@ccallable function main()::Cint
+@main function main(args)
     n_events = 20
 
     rng = Xoshiro(137)
@@ -34,10 +32,8 @@ Base.@ccallable function main()::Cint
         println(Core.stdout)
     end
 
-    return zero(Cint)
+    return 0
 end
 
-end # module RunHEPExample
-
 # # In Julia, test with
-# RunHEPExample.main()
+# julia> include("hepexample.jl"); main()

juliac/make.sh

@@ -5,11 +5,16 @@
 
 set -e
 
+julia -e 'exit(VERSION >= v"1.12" ? 0 : 1)' || (
+	echo "ERROR: Need julia >= v1.12 for juliac support." >&2
+	exit 1
+)
+
 # Binaries generated by juliac may segfault if JULIA_CPU_TARGET is set:
 unset JULIA_CPU_TARGET
 
-jlbindir=`julia-1.12 -e 'println(dirname(Sys.BINDIR))'`
+jlbindir=`julia -e 'println(dirname(Sys.BINDIR))'`
 
-julia-1.12 --project=. -e 'import Pkg; Pkg.instantiate()'
+julia --project=. -e 'import Pkg; Pkg.instantiate()'
 
-julia-1.12 --project=. "$jlbindir/share/julia/juliac.jl" --experimental --trim=unsafe-warn --output-exe hepexample hepexample.jl
+julia --project=. "$jlbindir/share/julia/juliac/juliac.jl" --experimental --trim=unsafe-warn --output-exe hepexample hepexample.jl