some updates for trimming (#57531)

- disable load path setup
- remove upstreamed change to utf8proc_map
- fix warning for accessing mod.main in the wrong world
- remove binding backedges when trimming

Author: JeffBezanson

contrib/juliac-buildscript.jl

@@ -33,6 +33,9 @@ end
     JuliaSyntax.enable_in_core!() = nothing
     init_active_project() = ACTIVE_PROJECT[] = nothing
     set_active_project(projfile::Union{AbstractString,Nothing}) = ACTIVE_PROJECT[] = projfile
+    init_depot_path() = nothing
+    init_load_path() = nothing
+    init_active_project() = nothing
     disable_library_threading() = nothing
     start_profile_listener() = nothing
     @inline function invokelatest(f::F, args...; kwargs...) where F
@@ -132,15 +135,8 @@ end
     mapreduce_empty(::typeof(abs), op::F, T) where {F}     = abs(reduce_empty(op, T))
     mapreduce_empty(::typeof(abs2), op::F, T) where {F}    = abs2(reduce_empty(op, T))
 end
-@eval Base.Unicode begin
-    function utf8proc_map(str::Union{String,SubString{String}}, options::Integer, chartransform::F = identity) where F
-        nwords = utf8proc_decompose(str, options, C_NULL, 0, chartransform)
-        buffer = Base.StringVector(nwords*4)
-        nwords = utf8proc_decompose(str, options, buffer, nwords, chartransform)
-        nbytes = ccall(:utf8proc_reencode, Int, (Ptr{UInt8}, Int, Cint), buffer, nwords, options)
-        nbytes < 0 && utf8proc_error(nbytes)
-        return String(resize!(buffer, nbytes))
-    end
+@eval Base.Sys begin
+    __init_build() = nothing
 end
 @eval Base.GMP begin
     function __init__()
@@ -202,6 +198,7 @@ let mod = Base.include(Base.__toplevel__, inputfile)
     if !isa(mod, Module)
         mod = Main
     end
+    Core.@latestworld
     if output_type == "--output-exe" && isdefined(mod, :main) && !add_ccallables
         entrypoint(mod.main, ())
     end

src/staticdata.c

@@ -825,6 +825,7 @@ static void jl_queue_module_for_serialization(jl_serializer_state *s, jl_module_
                      // ... or point to Base functions accessed by the runtime
                      (m == jl_base_module && (!strcmp(jl_symbol_name(b->globalref->name), "wait") ||
                                               !strcmp(jl_symbol_name(b->globalref->name), "task_done_hook"))))) {
+                    record_field_change((jl_value_t**)&b->backedges, NULL);
                     jl_queue_for_serialization(s, b);
                 }
             }