Use Base parallel precompilation to build stdlibs

Makefile

@@ -112,7 +112,7 @@ julia-debug julia-release : julia-% : julia-sysimg-% julia-src-% julia-symlink j
                                       julia-libccalllazyfoo julia-libccalllazybar julia-libllvmcalltest julia-base-cache
 
 stdlibs-cache-release stdlibs-cache-debug : stdlibs-cache-% : julia-%
-	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f pkgimage.mk all-$*
+	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT) -f pkgimage.mk $*
 
 debug release : % : julia-% stdlibs-cache-%
 
@@ -588,6 +588,7 @@ clean: | $(CLEAN_TARGETS)
 	@-$(MAKE) -C $(BUILDROOT)/cli clean
 	@-$(MAKE) -C $(BUILDROOT)/test clean
 	@-$(MAKE) -C $(BUILDROOT)/stdlib clean
+	@-$(MAKE) -C $(BUILDROOT) -f pkgimage.mk clean
 	-rm -f $(BUILDROOT)/julia
 	-rm -f $(BUILDROOT)/*.tar.gz
 	-rm -f $(build_depsbindir)/stringreplace \

base/loading.jl

@@ -1524,7 +1524,21 @@ function CacheFlags(f::UInt8)
     CacheFlags(use_pkgimages, debug_level, check_bounds, inline, opt_level)
 end
 CacheFlags(f::Int) = CacheFlags(UInt8(f))
-CacheFlags() = CacheFlags(ccall(:jl_cache_flags, UInt8, ()))
+function CacheFlags(cf::CacheFlags=CacheFlags(ccall(:jl_cache_flags, UInt8, ()));
+            use_pkgimages::Union{Nothing,Bool}=nothing,
+            debug_level::Union{Nothing,Int}=nothing,
+            check_bounds::Union{Nothing,Int}=nothing,
+            inline::Union{Nothing,Bool}=nothing,
+            opt_level::Union{Nothing,Int}=nothing
+        )
+    return CacheFlags(
+        use_pkgimages === nothing ? cf.use_pkgimages : use_pkgimages,
+        debug_level === nothing ? cf.debug_level : debug_level,
+        check_bounds === nothing ? cf.check_bounds : check_bounds,
+        inline === nothing ? cf.inline : inline,
+        opt_level === nothing ? cf.opt_level : opt_level
+    )
+end
 
 function _cacheflag_to_uint8(cf::CacheFlags)::UInt8
     f = UInt8(0)
@@ -2768,7 +2782,7 @@ function compilecache_dir(pkg::PkgId)
     return joinpath(DEPOT_PATH[1], entrypath)
 end
 
-function compilecache_path(pkg::PkgId, prefs_hash::UInt64; project::String=something(Base.active_project(), ""))::String
+function compilecache_path(pkg::PkgId, prefs_hash::UInt64; flags::CacheFlags=CacheFlags(), project::String=something(Base.active_project(), ""))::String
     entrypath, entryfile = cache_file_entry(pkg)
     cachepath = joinpath(DEPOT_PATH[1], entrypath)
     isdir(cachepath) || mkpath(cachepath)
@@ -2778,7 +2792,7 @@ function compilecache_path(pkg::PkgId, prefs_hash::UInt64; project::String=somet
         crc = _crc32c(project)
         crc = _crc32c(unsafe_string(JLOptions().image_file), crc)
         crc = _crc32c(unsafe_string(JLOptions().julia_bin), crc)
-        crc = _crc32c(ccall(:jl_cache_flags, UInt8, ()), crc)
+        crc = _crc32c(_cacheflag_to_uint8(flags), crc)
 
         cpu_target = get(ENV, "JULIA_CPU_TARGET", nothing)
         if cpu_target === nothing
@@ -2810,7 +2824,8 @@ end
 const MAX_NUM_PRECOMPILE_FILES = Ref(10)
 
 function compilecache(pkg::PkgId, path::String, internal_stderr::IO = stderr, internal_stdout::IO = stdout,
-                      keep_loaded_modules::Bool = true; flags::Cmd=``, reasons::Union{Dict{String,Int},Nothing}=Dict{String,Int}())
+                      keep_loaded_modules::Bool = true; flags::Cmd=``, cacheflags::CacheFlags=CacheFlags(),
+                      reasons::Union{Dict{String,Int},Nothing}=Dict{String,Int}())
 
     @nospecialize internal_stderr internal_stdout
     # decide where to put the resulting cache file
@@ -2859,7 +2874,7 @@ function compilecache(pkg::PkgId, path::String, internal_stderr::IO = stderr, in
             # Read preferences hash back from .ji file (we can't precompute because
             # we don't actually know what the list of compile-time preferences are without compiling)
             prefs_hash = preferences_hash(tmppath)
-            cachefile = compilecache_path(pkg, prefs_hash)
+            cachefile = compilecache_path(pkg, prefs_hash; flags=cacheflags)
             ocachefile = cache_objects ? ocachefile_from_cachefile(cachefile) : nothing
 
             # append checksum for so to the end of the .ji file:
@@ -3408,7 +3423,7 @@ global parse_pidfile_hook
 # The preferences hash is only known after precompilation so just assume no preferences.
 # Also ignore the active project, which means that if all other conditions are equal,
 # the same package cannot be precompiled from different projects and/or different preferences at the same time.
-compilecache_pidfile_path(pkg::PkgId) = compilecache_path(pkg, UInt64(0); project="") * ".pidfile"
+compilecache_pidfile_path(pkg::PkgId; flags::CacheFlags=CacheFlags()) = compilecache_path(pkg, UInt64(0); project="", flags) * ".pidfile"
 
 const compilecache_pidlock_stale_age = 10
 
@@ -3536,12 +3551,16 @@ end
                 M = root_module(req_key)
                 if PkgId(M) == req_key && module_build_id(M) === req_build_id
                     depmods[i] = M
+                elseif M == Core
+                    @debug "Rejecting cache file $cachefile because it was made with a different julia version"
+                    record_reason(reasons, "wrong julia version")
+                    return true # Won't be able to fulfill dependency
                 elseif ignore_loaded || !stalecheck
                     # Used by Pkg.precompile given that there it's ok to precompile different versions of loaded packages
                     @goto locate_branch
                 else
                     @debug "Rejecting cache file $cachefile because module $req_key is already loaded and incompatible."
-                    record_reason(reasons, req_key == PkgId(Core) ? "wrong julia version" : "wrong dep version loaded")
+                    record_reason(reasons, "wrong dep version loaded")
                     return true # Won't be able to fulfill dependency
                 end
             else