enable unconditional PKG3 precompile (#27105)

* enable unconditional PKG3 precompile

* reduce the number of precompile statements

stdlib/Pkg/src/API.jl

@@ -6,7 +6,7 @@ import Random
 import Dates
 import LibGit2
 
-import ..depots, ..logdir, ..devdir, ..print_first_command_header
+import ..depots, ..logdir, ..devdir
 import ..Operations, ..Display, ..GitTools, ..Pkg
 using ..Types, ..TOML
 
@@ -22,7 +22,6 @@ add_or_develop(pkgs::Vector{String}; kwargs...)            = add_or_develop([par
 add_or_develop(pkgs::Vector{PackageSpec}; kwargs...)       = add_or_develop(Context(), pkgs; kwargs...)
 
 function add_or_develop(ctx::Context, pkgs::Vector{PackageSpec}; mode::Symbol, kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     if mode == :develop
@@ -50,7 +49,6 @@ rm(pkgs::Vector{String}; kwargs...)      = rm([PackageSpec(pkg) for pkg in pkgs]
 rm(pkgs::Vector{PackageSpec}; kwargs...) = rm(Context(), pkgs; kwargs...)
 
 function rm(ctx::Context, pkgs::Vector{PackageSpec}; kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     project_deps_resolve!(ctx.env, pkgs)
@@ -126,7 +124,6 @@ up(pkgs::Vector{PackageSpec}; kwargs...)       = up(Context(), pkgs; kwargs...)
 
 function up(ctx::Context, pkgs::Vector{PackageSpec};
             level::UpgradeLevel=UPLEVEL_MAJOR, mode::PackageMode=PKGMODE_PROJECT, kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     update_registry(ctx)
@@ -158,7 +155,6 @@ pin(pkgs::Vector{String}; kwargs...)            = pin([PackageSpec(pkg) for pkg
 pin(pkgs::Vector{PackageSpec}; kwargs...)       = pin(Context(), pkgs; kwargs...)
 
 function pin(ctx::Context, pkgs::Vector{PackageSpec}; kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     project_deps_resolve!(ctx.env, pkgs)
@@ -173,7 +169,6 @@ free(pkgs::Vector{String}; kwargs...)            = free([PackageSpec(pkg) for pk
 free(pkgs::Vector{PackageSpec}; kwargs...)       = free(Context(), pkgs; kwargs...)
 
 function free(ctx::Context, pkgs::Vector{PackageSpec}; kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     registry_resolve!(ctx.env, pkgs)
@@ -205,7 +200,6 @@ test(pkgs::Vector{String}; kwargs...)             = test([PackageSpec(pkg) for p
 test(pkgs::Vector{PackageSpec}; kwargs...)        = test(Context(), pkgs; kwargs...)
 
 function test(ctx::Context, pkgs::Vector{PackageSpec}; coverage=false, kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     if isempty(pkgs)
@@ -234,7 +228,6 @@ end
 
 
 function gc(ctx::Context=Context(); period = Dates.Week(6), kwargs...)
-    print_first_command_header()
     function recursive_dir_size(path)
         sz = 0
         for (root, dirs, files) in walkdir(path)
@@ -360,7 +353,6 @@ build(pkg::PackageSpec) = build([pkg])
 build(pkgs::Vector{PackageSpec}) = build(Context(), pkgs)
 
 function build(ctx::Context, pkgs::Vector{PackageSpec}; kwargs...)
-    print_first_command_header()
     Context!(ctx; kwargs...)
     ctx.preview && preview_info()
     if isempty(pkgs)
@@ -390,7 +382,6 @@ end
 init() = init(Context())
 init(path::String) = init(Context(env=EnvCache(path)), path)
 function init(ctx::Context, path::String=pwd())
-    print_first_command_header()
     Context!(ctx; env = EnvCache(joinpath(path, "Project.toml")))
     Operations.init(ctx)
     return

stdlib/Pkg/src/Pkg.jl

@@ -9,21 +9,6 @@ depots() = Base.DEPOT_PATH
 logdir() = joinpath(depots()[1], "logs")
 devdir() = get(ENV, "JULIA_PKG_DEVDIR", joinpath(homedir(), ".julia", "dev"))
 
-have_warned_session = false
-function print_first_command_header()
-    global have_warned_session
-    have_warned_session && return
-    isinteractive() || return
-    if !PKG3_IS_PRECOMPILED && !haskey(ENV, "JULIA_PKG3_DISABLE_PRECOMPILE_WARNING")
-        @info """
-        Pkg is running without precompile statements, first action will be slow.
-        Rebuild julia with the environment variable `JULIA_PKG3_PRECOMPILE` set to enable precompilation of Pkg.
-        This message can be disabled by setting the env variable `JULIA_PKG3_DISABLE_PRECOMPILE_WARNING`.
-        """
-    end
-    have_warned_session = true
-end
-
 # load snapshotted dependencies
 include("../ext/TOML/src/TOML.jl")
 
@@ -66,13 +51,6 @@ using .Types
 using UUIDs
 import LibGit2
 import Dates
-# This crashes low memory systems and some of Julia's CI
-# so keep it disabled by default for now.
-if haskey(ENV, "JULIA_PKG3_PRECOMPILE")
-    const PKG3_IS_PRECOMPILED = true
-    include("precompile.jl")
-else
-    const PKG3_IS_PRECOMPILED = false
-end
+include("precompile.jl")
 
 end # module

stdlib/Pkg/src/REPLMode.jl

@@ -6,7 +6,7 @@ using UUIDs
 import REPL
 import REPL: LineEdit, REPLCompletions
 
-import ..devdir, ..print_first_command_header, ..API
+import ..devdir, ..API
 using ..Types, ..Display, ..Operations
 
 ############
@@ -180,7 +180,6 @@ function tokenize(cmd::String)::Vector{Vector{Token}}
 end
 
 function tokenize!(words::Vector{<:AbstractString})::Vector{Token}
-    print_first_command_header()
     tokens = Token[]
     help_mode = false
     preview_mode = false