build: cleanup base files inclusion (JuliaLang#45441)

Ensures the out-of-tree build has the correct files installed, and
simplifies some of the `include`s used in Base.

Fixes a return value that was relied on (largely unnecessarily) by a
loading test, despite being invalid before now.

Fixes JuliaLang#31140

Author: vtjnash

Makefile

@@ -7,7 +7,7 @@ default: $(JULIA_BUILD_MODE) # contains either "debug" or "release"
 all: debug release
 
 # sort is used to remove potential duplicates
-DIRS := $(sort $(build_bindir) $(build_depsbindir) $(build_libdir) $(build_private_libdir) $(build_libexecdir) $(build_includedir) $(build_includedir)/julia $(build_sysconfdir)/julia $(build_datarootdir)/julia $(build_datarootdir)/julia/stdlib $(build_man1dir))
+DIRS := $(sort $(build_bindir) $(build_depsbindir) $(build_libdir) $(build_private_libdir) $(build_libexecdir) $(build_includedir) $(build_includedir)/julia $(build_sysconfdir)/julia $(build_datarootdir)/julia $(build_datarootdir)/julia/src $(build_datarootdir)/julia/stdlib $(build_man1dir))
 ifneq ($(BUILDROOT),$(JULIAHOME))
 BUILDDIRS := $(BUILDROOT) $(addprefix $(BUILDROOT)/,base src src/flisp src/support src/clangsa cli doc deps stdlib test test/clangsa test/embedding test/llvmpasses)
 BUILDDIRMAKE := $(addsuffix /Makefile,$(BUILDDIRS)) $(BUILDROOT)/sysimage.mk
@@ -37,13 +37,13 @@ configure:
 endif
 
 $(foreach dir,$(DIRS),$(eval $(call dir_target,$(dir))))
-$(foreach link,base $(JULIAHOME)/test,$(eval $(call symlink_target,$(link),$$(build_datarootdir)/julia,$(notdir $(link)))))
+$(eval $(call symlink_target,$(JULIAHOME)/test,$$(build_datarootdir)/julia,test))
 
 julia_flisp.boot.inc.phony: julia-deps
 	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT)/src julia_flisp.boot.inc.phony
 
 # Build the HTML docs (skipped if already exists, notably in tarballs)
-$(BUILDROOT)/doc/_build/html/en/index.html: $(shell find $(BUILDROOT)/base $(BUILDROOT)/doc \( -path $(BUILDROOT)/doc/_build -o -path $(BUILDROOT)/doc/deps -o -name *_constants.jl -o -name *_h.jl -o -name version_git.jl \) -prune -o -type f -print)
+$(BUILDROOT)/doc/_build/html/en/index.html: $(shell find $(BUILDROOT)/base $(BUILDROOT)/doc \( -path $(BUILDROOT)/doc/_build -o -path $(BUILDROOT)/doc/deps \) -prune -o -type f -print)
 	@$(MAKE) docs
 
 julia-symlink: julia-cli-$(JULIA_BUILD_MODE)
@@ -56,7 +56,7 @@ ifndef JULIA_VAGRANT_BUILD
 endif
 endif
 
-julia-deps: | $(DIRS) $(build_datarootdir)/julia/base $(build_datarootdir)/julia/test
+julia-deps: | $(DIRS) $(build_datarootdir)/julia/test
 	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT)/deps
 
 # `julia-stdlib` depends on `julia-deps` so that the fake JLL stdlibs can copy in their Artifacts.toml files.
@@ -84,9 +84,14 @@ julia-sysimg-ji : julia-stdlib julia-base julia-cli-$(JULIA_BUILD_MODE) julia-sr
 julia-sysimg-bc : julia-stdlib julia-base julia-cli-$(JULIA_BUILD_MODE) julia-src-$(JULIA_BUILD_MODE) | $(build_private_libdir)
 	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f sysimage.mk sysimg-bc JULIA_EXECUTABLE='$(JULIA_EXECUTABLE)'
 
-julia-sysimg-release julia-sysimg-debug : julia-sysimg-% : julia-sysimg-ji julia-src-%
-	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f sysimage.mk sysimg-$*
+$(JULIA_SYSIMG_release): julia-sysimg-ji julia-src-release
+	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f sysimage.mk sysimg-release
+$(JULIA_SYSIMG_debug) : julia-sysimg-ji julia-src-debug
+	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f sysimage.mk sysimg-debug
 
+julia-sysimg-release : $(JULIA_SYSIMG_release)
+julia-sysimg-debug : $(JULIA_SYSIMG_debug)
+julia-base-cache: $(build_datarootdir)/julia/base.cache
 julia-debug julia-release : julia-% : julia-sysimg-% julia-src-% julia-symlink julia-libccalltest julia-libllvmcalltest julia-base-cache
 
 debug release : % : julia-%
@@ -156,10 +161,10 @@ $(build_datarootdir)/julia/julia-config.jl: $(JULIAHOME)/contrib/julia-config.jl
 $(build_depsbindir)/stringreplace: $(JULIAHOME)/contrib/stringreplace.c | $(build_depsbindir)
 	@$(call PRINT_CC, $(HOSTCC) -o $(build_depsbindir)/stringreplace $(JULIAHOME)/contrib/stringreplace.c)
 
-julia-base-cache: julia-sysimg-$(JULIA_BUILD_MODE) | $(DIRS) $(build_datarootdir)/julia
+$(build_datarootdir)/julia/base.cache: $(JULIA_SYSIMG) | $(DIRS) $(build_datarootdir)/julia
 	@JULIA_BINDIR=$(call cygpath_w,$(build_bindir)) WINEPATH="$(call cygpath_w,$(build_bindir));$$WINEPATH" \
 		$(call spawn, $(JULIA_EXECUTABLE) --startup-file=no $(call cygpath_w,$(JULIAHOME)/etc/write_base_cache.jl) \
-		$(call cygpath_w,$(build_datarootdir)/julia/base.cache))
+		$(call cygpath_w,$@))
 
 # public libraries, that are installed in $(prefix)/lib
 JL_TARGETS := julia
@@ -313,10 +318,9 @@ ifeq ($(BUNDLE_DEBUG_LIBS),1)
 endif
 
 	# Copy in all .jl sources as well
-	mkdir -p $(DESTDIR)$(datarootdir)/julia/base $(DESTDIR)$(datarootdir)/julia/test
-	cp -R -L $(JULIAHOME)/base/* $(DESTDIR)$(datarootdir)/julia/base
-	cp -R -L $(JULIAHOME)/test/* $(DESTDIR)$(datarootdir)/julia/test
+	mkdir -p $(DESTDIR)$(datarootdir)/julia/src $(DESTDIR)$(datarootdir)/julia/test
 	cp -R -L $(build_datarootdir)/julia/* $(DESTDIR)$(datarootdir)/julia
+	cp -R -L $(JULIAHOME)/test/* $(DESTDIR)$(datarootdir)/julia/test
 	# Copy documentation
 	cp -R -L $(BUILDROOT)/doc/_build/html $(DESTDIR)$(docdir)/
 	# Remove various files which should not be installed
@@ -462,7 +466,7 @@ ifneq ($(BUILDROOT),$(JULIAHOME))
 	$(error make light-source-dist does not work in out-of-tree builds)
 endif
 	# Save git information
-	-@$(MAKE) -C $(JULIAHOME)/base version_git.jl.phony
+	-@$(MAKE) -C $(JULIAHOME)/base version_git.jl
 
 	# Create file light-source-dist.tmp to hold all the filenames that go into the tarball
 	echo "base/version_git.jl" > light-source-dist.tmp

base/.gitignore

@@ -1,10 +1,4 @@
-/features_h.jl
-/pcre_h.jl
-/errno_h.jl
-/build_h.jl
 /build_h.jl.phony
-/file_constants.jl
-/uv_constants.jl
 /version_git.jl
 /version_git.jl.phony
 /userimg.jl

base/Base.jl

@@ -151,18 +151,8 @@ using .Iterators: Flatten, Filter, product  # for generators
 include("namedtuple.jl")
 
 # For OS specific stuff
-# We need to strcat things here, before strings are really defined
-function strcat(x::String, y::String)
-    out = ccall(:jl_alloc_string, Ref{String}, (Csize_t,), Core.sizeof(x) + Core.sizeof(y))
-    GC.@preserve x y out begin
-        out_ptr = unsafe_convert(Ptr{UInt8}, out)
-        unsafe_copyto!(out_ptr, unsafe_convert(Ptr{UInt8}, x), Core.sizeof(x))
-        unsafe_copyto!(out_ptr + Core.sizeof(x), unsafe_convert(Ptr{UInt8}, y), Core.sizeof(y))
-    end
-    return out
-end
-include(strcat((length(Core.ARGS)>=2 ? Core.ARGS[2] : ""), "build_h.jl"))     # include($BUILDROOT/base/build_h.jl)
-include(strcat((length(Core.ARGS)>=2 ? Core.ARGS[2] : ""), "version_git.jl")) # include($BUILDROOT/base/version_git.jl)
+include("../build_h.jl")
+include("../version_git.jl")
 
 # These used to be in build_h.jl and are retained for backwards compatibility
 const libblas_name = "libblastrampoline"

base/Makefile

@@ -6,7 +6,22 @@ include $(JULIAHOME)/Make.inc
 
 TAGGED_RELEASE_BANNER := ""
 
-all: $(addprefix $(BUILDDIR)/,pcre_h.jl errno_h.jl build_h.jl.phony features_h.jl file_constants.jl uv_constants.jl version_git.jl.phony)
+all:
+
+BASE_SRCS := $(patsubst ./%,%,$(shell cd $(SRCDIR) && find . -name \*.jl -and -not -name version_git.jl -and -not -name '*.phony'))
+GENERATED_SRCS := pcre_h.jl errno_h.jl build_h.jl.phony features_h.jl file_constants.jl uv_constants.jl version_git.jl.phony
+
+GENERATED_DSTS := $(addprefix $(build_datarootdir)/julia/src/,$(GENERATED_SRCS))
+BASE_DSTS := $(addprefix $(build_datarootdir)/julia/src/base/,$(BASE_SRCS)) $(GENERATED_DSTS)
+BASE_DIRS := $(sort $(dir $(BASE_DSTS)))
+$(foreach dir,$(BASE_DIRS),$(eval $(call dir_target,$(dir))))
+
+# we might like to add "| $(BASE_DIRS)" here, but that causes many version of 'make' to get confused and fail to build consistently
+$(build_datarootdir)/julia/src/base/%.jl: $(SRCDIR)/%.jl
+	@mkdir -p $(dir $@)
+	cp $< $@
+
+all: $(BASE_DSTS)
 
 PCRE_CONST := 0x[0-9a-fA-F]+|[0-9]+|\([\-0-9]+\)
 ifeq ($(USE_SYSTEM_PCRE), 1)
@@ -17,29 +32,37 @@ endif
 
 define parse_features
 @echo "# $(2) features" >> $@
-@$(call PRINT_PERL, cat $(SRCDIR)/../src/features_$(1).h | perl -lne 'print "const JL_$(2)_$$1 = UInt32($$2)" if /^\s*JL_FEATURE_DEF(?:_NAME)?\(\s*(\w+)\s*,\s*([^,]+)\s*,.*\)\s*(?:\/\/.*)?$$/' >> $@)
+@$(call PRINT_PERL, cat $(JULIAHOME)/src/features_$(1).h | \
+	perl -lne 'print "const JL_$(2)_$$1 = UInt32($$2)" if /^\s*JL_FEATURE_DEF(?:_NAME)?\(\s*(\w+)\s*,\s*([^,]+)\s*,.*\)\s*(?:\/\/.*)?$$/' >> $@)
 @echo >> $@
 endef
 
-$(BUILDDIR)/features_h.jl: $(SRCDIR)/../src/features_x86.h $(SRCDIR)/../src/features_aarch32.h $(SRCDIR)/../src/features_aarch64.h
+$(build_datarootdir)/julia/src/features_h.jl: $(JULIAHOME)/src/features_x86.h $(JULIAHOME)/src/features_aarch32.h $(JULIAHOME)/src/features_aarch64.h
+	@mkdir -p $(dir $@)
 	@-rm -f $@
 	@$(call parse_features,x86,X86)
 	@$(call parse_features,aarch32,AArch32)
 	@$(call parse_features,aarch64,AArch64)
 
-$(BUILDDIR)/pcre_h.jl: $(PCRE_INCL_PATH)
+$(build_datarootdir)/julia/src/pcre_h.jl: $(PCRE_INCL_PATH)
+	@mkdir -p $(dir $@)
 	@$(call PRINT_PERL, $(CPP) -D PCRE2_CODE_UNIT_WIDTH=8 -dM $< | perl -nle '/^\s*#define\s+PCRE2_(\w*)\s*\(?($(PCRE_CONST))\)?u?\s*$$/ and print index($$1, "ERROR_") == 0 ? "const $$1 = Cint($$2)" : "const $$1 = UInt32($$2)"' | LC_ALL=C sort > $@)
 
-$(BUILDDIR)/errno_h.jl:
+$(build_datarootdir)/julia/src/errno_h.jl:
+	@mkdir -p $(dir $@)
 	@$(call PRINT_PERL, echo '#include <errno.h>' | $(CPP) -dM - | perl -nle 'print "const $$1 = Int32($$2)" if /^#define\s+(E\w+)\s+(\d+)\s*$$/' | LC_ALL=C sort > $@)
 
-$(BUILDDIR)/file_constants.jl: $(SRCDIR)/../src/file_constants.h
+$(build_datarootdir)/julia/src/file_constants.jl: $(JULIAHOME)/src/file_constants.h
+	@mkdir -p $(dir $@)
 	@$(call PRINT_PERL, $(CPP_STDOUT) -DJULIA $< | perl -nle 'print "$$1 0o$$2" if /^(\s*const\s+[A-z_]+\s+=)\s+(0[0-9]*)\s*$$/; print "$$1" if /^\s*(const\s+[A-z_]+\s+=\s+([1-9]|0x)[0-9A-z]*)\s*$$/' > $@)
 
-$(BUILDDIR)/uv_constants.jl: $(SRCDIR)/../src/uv_constants.h $(LIBUV_INC)/uv/errno.h
+$(build_datarootdir)/julia/src/uv_constants.jl: $(JULIAHOME)/src/uv_constants.h $(LIBUV_INC)/uv/errno.h
+	@mkdir -p $(dir $@)
 	@$(call PRINT_PERL, $(CPP_STDOUT) "-I$(LIBUV_INC)" -DJULIA $< | tail -n 16 > $@)
 
+$(build_datarootdir)/julia/src/build_h.jl.phony: $(BUILDDIR)/build_h.jl.phony
 $(BUILDDIR)/build_h.jl.phony:
+	@mkdir -p $(build_datarootdir)/julia/src
 	@echo "# This file is automatically generated in base/Makefile" > $@
 ifeq ($(XC_HOST),)
 	@echo "const MACHINE = \"$(BUILD_MACHINE)\"" >> $@
@@ -87,35 +110,44 @@ endif
 
 	@# This to ensure that we always rebuild this file, but only when it is modified do we touch build_h.jl,
 	@# ensuring we rebuild the system image as infrequently as possible
-	@if ! cmp -s $@ build_h.jl; then \
+	@if ! cmp -s $@ $(build_datarootdir)/julia/src/build_h.jl; then \
 		$(call PRINT_PERL,) \
-		mv $@ build_h.jl; \
+		mv $@ $(build_datarootdir)/julia/src/build_h.jl; \
 	else \
 		rm -f $@; \
 	fi
 
+$(build_datarootdir)/julia/src/version_git.jl.phony: $(BUILDDIR)/version_git.jl.phony
 $(BUILDDIR)/version_git.jl.phony: $(SRCDIR)/version_git.sh
-ifneq ($(NO_GIT), 1)
-	sh $< $(SRCDIR) > $@
-	@# This to avoid touching version_git.jl when it is not modified,
-	@# so that the system image does not need to be rebuilt.
-	@if ! cmp -s $@ version_git.jl; then \
-	    $(call PRINT_PERL,) \
-	    mv $@ version_git.jl; \
-	else \
-	    rm -f $@; \
-	fi
-else
-ifeq ($(shell [ -f $(BUILDDIR)/version_git.jl ] && echo "true"), true)
-	@# Give warning if boilerplate git is used
+	@mkdir -p $(build_datarootdir)/julia/src
+ifneq ($(NO_GIT),1)
+	@sh $< $(SRCDIR) > $@
+else ifeq ($(shell [ -f $(BUILDDIR)/version_git.jl ] && echo "true"), true)
+	@# Give warning if boilerplate git is found here
 	@if grep -q "Default output if git is not available" $(BUILDDIR)/version_git.jl; then \
 	    echo "WARNING: Using boilerplate git version info" >&2; \
 	fi
+	@cp $(BUILDDIR)/version_git.jl $@
+else ifeq ($(shell [ -f $(SRCDIR)/version_git.jl ] && echo "true"), true)
+	@# Give warning if boilerplate git is found here
+	@if grep -q "Default output if git is not available" $(SRCDIR)/version_git.jl; then \
+	    echo "WARNING: Using boilerplate git version info" >&2; \
+	fi
+	@cp $(SRCDIR)/version_git.jl $@
 else
 	$(warning "WARNING: Generating boilerplate git version info")
-	@sh $(SRCDIR)/version_git.sh $(SRCDIR) NO_GIT > $(BUILDDIR)/version_git.jl
-endif
+	@sh $< $(SRCDIR) NO_GIT > $@
 endif
+	@# This to avoid touching version_git.jl when it is not modified,
+	@# so that the system image does not need to be rebuilt.
+	@if ! cmp -s $@ $(build_datarootdir)/julia/src/version_git.jl; then \
+	    $(call PRINT_PERL,) \
+	    mv $@ $(build_datarootdir)/julia/src/version_git.jl; \
+	else \
+	    rm -f $@; \
+	fi
+$(BUILDDIR)/version_git.jl: $(SRCDIR)/version_git.sh
+	sh $< $(SRCDIR) > $@
 
 ifeq (,$(filter $(OS), WINNT emscripten))
 # For any USE_SYSTEM_* libraries that will be dynamically loaded by libjulia,
@@ -163,7 +195,7 @@ endif
 define symlink_system_library
 libname_$2 := $$(notdir $(call versioned_libname,$2,$3))
 libpath_$2 := $$(shell $$(call spawn,$$(LIBWHICH)) -p $$(libname_$2) 2>/dev/null)
-symlink_$2: $$(build_private_libdir)/$$(libname_$2)
+symlink_$2: $$(build_private_libdir)/$$(libname_$2) .FORCE
 $$(build_private_libdir)/$$(libname_$2):
 	@if [ -e "$$(libpath_$2)" ]; then \
 		REALPATH=$$(libpath_$2); \
@@ -269,7 +301,10 @@ endif
 
 symlink_system_libraries: $(SYMLINK_SYSTEM_LIBRARIES)
 
-.PHONY: $(BUILDDIR)/build_h.jl.phony $(BUILDDIR)/version_git.jl.phony clean all symlink_*
+.FORCE:
+.PHONY: $(BUILDDIR)/version_git.jl $(BUILDDIR)/version_git.jl.phony $(build_datarootdir)/julia/src/version_git.jl.phony \
+	$(BUILDDIR)/build_h.jl.phony $(build_datarootdir)/julia/src/build_h.jl.phony \
+	clean all .FORCE
 
 clean:
 	-rm -f $(BUILDDIR)/pcre_h.jl
@@ -281,4 +316,5 @@ clean:
 	-rm -f $(BUILDDIR)/file_constants.jl
 	-rm -f $(BUILDDIR)/version_git.jl
 	-rm -f $(BUILDDIR)/version_git.jl.phony
+	-rm -rf $(build_datarootdir)/julia/src/*
 	-rm -f $(build_private_libdir)/lib*.$(SHLIB_EXT)*

base/cpuid.jl

@@ -21,7 +21,7 @@ Base.:<=(a::ISA, b::ISA) = a.features <= b.features
 Base.:<(a::ISA,  b::ISA) = a.features <  b.features
 Base.isless(a::ISA,  b::ISA) = a < b
 
-include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "features_h.jl"))  # include($BUILDROOT/base/features_h.jl)
+include("../features_h.jl")
 
 # Keep in sync with `arch_march_isa_mapping`.
 const ISAs_by_family = Dict(

base/filesystem.jl

@@ -91,7 +91,7 @@ uv_fs_req_cleanup(req) = ccall(:uv_fs_req_cleanup, Cvoid, (Ptr{Cvoid},), req)
 include("path.jl")
 include("stat.jl")
 include("file.jl")
-include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "file_constants.jl"))  # include($BUILDROOT/base/file_constants.jl)
+include("../file_constants.jl")
 
 ## Operations with File (fd) objects ##
 

base/initdefs.jl

@@ -93,6 +93,7 @@ function append_default_depot_path!(DEPOT_PATH)
     path in DEPOT_PATH || push!(DEPOT_PATH, path)
     path = abspath(Sys.BINDIR, "..", "share", "julia")
     path in DEPOT_PATH || push!(DEPOT_PATH, path)
+    return DEPOT_PATH
 end
 
 function init_depot_path()
@@ -111,6 +112,7 @@ function init_depot_path()
     else
         append_default_depot_path!(DEPOT_PATH)
     end
+    nothing
 end
 
 ## LOAD_PATH & ACTIVE_PROJECT ##
@@ -220,9 +222,7 @@ function parse_load_path(str::String)
 end
 
 function init_load_path()
-    if Base.creating_sysimg
-        paths = ["@stdlib"]
-    elseif haskey(ENV, "JULIA_LOAD_PATH")
+    if haskey(ENV, "JULIA_LOAD_PATH")
         paths = parse_load_path(ENV["JULIA_LOAD_PATH"])
     else
         paths = filter!(env -> env !== nothing,

base/libc.jl

@@ -14,7 +14,7 @@ if Sys.iswindows()
     export GetLastError, FormatMessage
 end
 
-include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "errno_h.jl"))  # include($BUILDROOT/base/errno_h.jl)
+include("../errno_h.jl")
 
 ## RawFD ##
 

base/libuv.jl

@@ -2,7 +2,7 @@
 
 # Core definitions for interacting with the libuv library from Julia
 
-include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "uv_constants.jl"))  # include($BUILDROOT/base/uv_constants.jl)
+include("../uv_constants.jl")
 
 # convert UV handle data to julia object, checking for null
 function uv_sizeof_handle(handle)

base/loading.jl

@@ -42,7 +42,7 @@ elseif Sys.isapple()
     #    char filename[max_filename_length];
     # };
     # Buffer buf;
-    # getattrpath(path, &attr_list, &buf, sizeof(buf), FSOPT_NOFOLLOW);
+    # getattrlist(path, &attr_list, &buf, sizeof(buf), FSOPT_NOFOLLOW);
     function isfile_casesensitive(path)
         isaccessiblefile(path) || return false
         path_basename = String(basename(path))
@@ -804,7 +804,7 @@ end
 
 function find_source_file(path::AbstractString)
     (isabspath(path) || isfile(path)) && return path
-    base_path = joinpath(Sys.BINDIR, DATAROOTDIR, "julia", "base", path)
+    base_path = joinpath(Sys.BINDIR, DATAROOTDIR, "julia", "src", "base", path)
     return isfile(base_path) ? normpath(base_path) : nothing
 end
 

base/pcre.jl

@@ -6,8 +6,7 @@ module PCRE
 
 import ..RefValue
 
-# include($BUILDROOT/base/pcre_h.jl)
-include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "pcre_h.jl"))
+include("../pcre_h.jl")
 
 const PCRE_LIB = "libpcre2-8"
 

base/sysimg.jl

@@ -11,14 +11,13 @@ import Base.MainInclude: eval, include
 pushfirst!(Base._included_files, (@__MODULE__, joinpath(@__DIR__, "Base.jl")))
 pushfirst!(Base._included_files, (@__MODULE__, joinpath(@__DIR__, "sysimg.jl")))
 
-# set up depot & load paths to be able to find stdlib packages
-@eval Base creating_sysimg = true
-Base.init_depot_path()
-Base.init_load_path()
-
 if Base.is_primary_base_module
 # load some stdlib packages but don't put their names in Main
 let
+    # set up depot & load paths to be able to find stdlib packages
+    push!(empty!(LOAD_PATH), "@stdlib")
+    Base.append_default_depot_path!(DEPOT_PATH)
+
     # Stdlibs sorted in dependency, then alphabetical, order by contrib/print_sorted_stdlibs.jl
     # Run with the `--exclude-jlls` option to filter out all JLL packages
     stdlibs = [