Add disable_optimization JLLWrappers preference

src/JLLWrappers.jl

@@ -1,11 +1,19 @@
 module JLLWrappers
 
-if isdefined(Base, :Experimental) && isdefined(Base.Experimental, Symbol("@compiler_options"))
-    @eval Base.Experimental.@compiler_options compile=min optimize=0 infer=false
+@static if VERSION >= v"1.6.0-DEV"
+    using Preferences
 end
 
-if VERSION >= v"1.6.0-DEV"
-    using Preferences
+@static if VERSION >= v"1.6.0-DEV"
+    const disable_optimization = @load_preference("disable_optimization", true)
+else
+    const disable_optimization = true
+end
+
+@static if isdefined(Base, :Experimental) && isdefined(Base.Experimental, Symbol("@compiler_options"))
+    if disable_optimization
+        @eval Base.Experimental.@compiler_options compile=min optimize=0 infer=false
+    end
 end
 
 const global_typeassert_available = VERSION >= v"1.9.0-"

src/toplevel_generators.jl

@@ -46,9 +46,12 @@ end
     generate_compiler_options(src_name)
 
 Because JLL packages do not contain code that benefits much from compiler optimizations,
-we disable them for a sizable boost in first load time.
+we disable them for a sizable boost in first load time. This can be opted out of by
+setting the `disable_optimization` JLLWrappers preference to `false`.
 """
 function generate_compiler_options(src_name)
+    JLLWrappers.disable_optimization || return nothing
+
     # Newer Julias have `@compiler_options` that can enable interpreted mode
     if isdefined(Base, :Experimental) && isdefined(Base.Experimental, Symbol("@compiler_options"))
         return quote

test/runtests.jl

@@ -43,6 +43,7 @@ end; end
 
 module TestJLL end
 @testset "JLLWrappers.jl" begin
+    @test JLLWrappers.disable_optimization === true
     mktempdir() do dir
         Pkg.activate(dir)
 
@@ -154,3 +155,41 @@ module TestJLL end
         end
     end
 end
+
+@static if VERSION >= v"1.6.0-DEV"
+    @testset "disable_optimization=false" begin
+        mktempdir() do test_dir
+            preferences_path = joinpath(test_dir, "LocalPreferences.toml")
+            set_preferences!(preferences_path, "JLLWrappers", "disable_optimization" => false)
+
+            jllwrappers_path = abspath(joinpath(@__DIR__, ".."))
+            helloworld_path = joinpath(@__DIR__, "HelloWorldC_jll")
+
+            script_path = joinpath(test_dir, "subproc_script.jl")
+            open(script_path, "w") do io
+                println(io, "using Pkg")
+                println(io, "Pkg.develop([")
+                println(io, "    Pkg.PackageSpec(path=", repr(jllwrappers_path), "),")
+                println(io, "    Pkg.PackageSpec(path=", repr(helloworld_path), "),")
+                println(io, "])")
+                println(io, "using JLLWrappers")
+                println(io, "JLLWrappers.disable_optimization === false || error(\"expected disable_optimization=false, got \$(JLLWrappers.disable_optimization)\")")
+                println(io, "using HelloWorldC_jll")
+                println(io, "HelloWorldC_jll.is_available() || error(\"HelloWorldC_jll not available\")")
+                println(io, "isfile(HelloWorldC_jll.hello_world_path) || error(\"hello_world_path not a file: \$(HelloWorldC_jll.hello_world_path)\")")
+                println(io, "println(\"OK\")")
+            end
+
+            cmd = `$(Base.julia_cmd()) --project=$test_dir $script_path`
+            io = IOBuffer()
+            ok = success(pipeline(cmd; stdout=io, stderr=io))
+            output = String(take!(io))
+
+            if !ok
+                @info "subprocess output" output
+            end
+            @test ok
+            @test occursin("OK", output)
+        end
+    end
+end