Prevent stdlib compat entries from breaking old Julia versions (#1324)

* Prevent stdlib compat entries from breaking old Julia versions

* Update AutoBuild.jl

* Fix tests

* Fix tests

* Fix tests

Author: DilumAluthge

src/AutoBuild.jl

@@ -1663,8 +1663,10 @@ function build_project_dict(name, version, dependencies::Array{<:AbstractDepende
             "JLLWrappers" => "$(jllwrappers_compat)",
             "julia" => "$(julia_compat)",
             # Stdlibs always used, we need to have compat bounds also for them.
-            "Libdl" => "1",
-            "Artifacts" => "1",
+            # The "< 0.0.1" trick is needed to prevent `Pkg.test` from breaking
+            # on older Julia versions.
+            "Libdl" => "< 0.0.1, 1",
+            "Artifacts" => "< 0.0.1, 1",
         )
     )
 
@@ -1689,15 +1691,15 @@ function build_project_dict(name, version, dependencies::Array{<:AbstractDepende
     if minimum_compat(julia_compat) < v"1.6"
         # `Pkg` is used in JLLWrappers only when we require Julia v1.5-.
         project["deps"]["Pkg"] = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
-        project["compat"]["Pkg"] = "1"
+        project["compat"]["Pkg"] = "< 0.0.1, 1"
     end
     if lazy_artifacts
         project["deps"]["LazyArtifacts"] = "4af54fe1-eca0-43a8-85a7-787d91b784e3"
-        project["compat"]["LazyArtifacts"] = "1"
+        project["compat"]["LazyArtifacts"] = "< 0.0.1, 1"
     end
     if !isempty(augment_platform_block)
         project["deps"]["TOML"] = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
-        project["compat"]["TOML"] = "1"
+        project["compat"]["TOML"] = "< 0.0.1, 1"
     end
 
     return project

test/basic.jl

@@ -199,7 +199,7 @@ end
     @test dict["name"] == "$(name)_jll"
     @test dict["version"] == "1.0.0"
     @test dict["uuid"] == "8fcd9439-76b0-55f4-a525-bad0597c05d8"
-    @test dict["compat"] == Dict{String,Any}("julia" => "1.0", "JLLWrappers" => "1.2.0", "Pkg" => "1", "Libdl" => "1", "Artifacts" => "1")
+    @test dict["compat"] == Dict{String,Any}("julia" => "1.0", "JLLWrappers" => "1.2.0", "Pkg" => "< 0.0.1, 1", "Libdl" => "< 0.0.1, 1", "Artifacts" => "< 0.0.1, 1")
     @test all(in.(
         (
             "Pkg"       => "44cfe95a-1eb2-52ea-b672-e2afdf69b78f",
@@ -224,16 +224,16 @@ end
 
     # Ensure passing a Julia dependency bound works
     dict = build_project_dict(name, version, dependencies, "1.4")
-    @test dict["compat"] == Dict{String,Any}("julia" => "1.4", "JLLWrappers" => "1.2.0", "Pkg" => "1", "Libdl" => "1", "Artifacts" => "1")
+    @test dict["compat"] == Dict{String,Any}("julia" => "1.4", "JLLWrappers" => "1.2.0", "Pkg" => "< 0.0.1, 1", "Libdl" => "< 0.0.1, 1", "Artifacts" => "< 0.0.1, 1")
 
     dict = build_project_dict(name, version, dependencies, "~1.4")
-    @test dict["compat"] == Dict{String,Any}("julia" => "~1.4", "JLLWrappers" => "1.2.0", "Pkg" => "1", "Libdl" => "1", "Artifacts" => "1")
+    @test dict["compat"] == Dict{String,Any}("julia" => "~1.4", "JLLWrappers" => "1.2.0", "Pkg" => "< 0.0.1, 1", "Libdl" => "< 0.0.1, 1", "Artifacts" => "< 0.0.1, 1")
 
     @test_throws ErrorException build_project_dict(name, version, dependencies, "nonsense")
 
     # Ensure passing a JLLWrappers dependency bound works
     dict = build_project_dict(name, version, dependencies; jllwrappers_compat="1.4.0")
-    @test dict["compat"] == Dict{String,Any}("julia" => "1.0", "JLLWrappers" => "1.4.0", "Pkg" => "1", "Libdl" => "1", "Artifacts" => "1")
+    @test dict["compat"] == Dict{String,Any}("julia" => "1.0", "JLLWrappers" => "1.4.0", "Pkg" => "< 0.0.1, 1", "Libdl" => "< 0.0.1, 1", "Artifacts" => "< 0.0.1, 1")
 
     # Ensure passing compat bounds works
     dependencies = [

test/jll.jl

@@ -29,9 +29,9 @@ module TestJLL end
         "julia" => "1.0",
         "XZ_jll" => "=2.4.6",
         "JLLWrappers" => "1.2.0",
-        "Libdl" => "1",
-        "Artifacts" => "1",
-        "Pkg" => "1",
+        "Libdl" => "< 0.0.1, 1",
+        "Artifacts" => "< 0.0.1, 1",
+        "Pkg" => "< 0.0.1, 1",
     )
     @test project["version"] == "1.3.5"
     # Make sure BuildDependency's don't find their way to the project