disable prec via Preferences

SnoopPrecompile/Project.toml

@@ -3,7 +3,11 @@ uuid = "66db9d55-30c0-4569-8b51-7e840670fc0c"
 authors = ["Tim Holy <tim.holy@gmail.com> and contributors"]
 version = "1.0.2"
 
+[deps]
+Preferences = "21216c6a-2e73-6563-6e65-726566657250"
+
 [compat]
+Preferences = "1"
 julia = "1"
 
 [extras]

SnoopPrecompile/src/SnoopPrecompile.jl

@@ -1,10 +1,13 @@
 module SnoopPrecompile
 
+using Preferences
+
 export @precompile_all_calls, @precompile_setup
 
 const verbose = Ref(false) # if true, prints all the precompiles
 const have_inference_tracking = isdefined(Core.Compiler, :__set_measure_typeinf)
 const have_force_compile = isdefined(Base, :Experimental) && isdefined(Base.Experimental, Symbol("#@force_compile"))
+const do_precompile = Base.VERSION >= v"1.6" ? @load_preference("precompile", true) : true
 
 function precompile_roots(roots)
  @assert have_inference_tracking
@@ -44,6 +47,7 @@ end
  - indirect runtime-dispatched calls to such methods.
 """
 macro precompile_all_calls(ex::Expr)
+ do_precompile || return :()
  if have_force_compile
  ex = quote
  begin
@@ -101,6 +105,7 @@ runtime dispatches (though they will be precompiled anyway if the runtime-callee
 to your package).
 """
 macro precompile_setup(ex::Expr)
+ do_precompile || return :()
  return esc(quote
  # let
  if ccall(:jl_generating_output, Cint, ()) == 1 || $SnoopPrecompile.verbose[]