Warn about julia 1.12 (#2698)

* Warn about julia 1.12

* Update Enzyme.jl

* Revise warning for Julia 1.12 support

Updated warning message regarding Julia version support.

Author: wsmoses

src/Enzyme.jl

@@ -1569,4 +1569,20 @@ if VERSION < v"1.12.0"
     include("precompile.jl")
 end
 
+function __init__()
+    @static if VERSION ≥ v"1.12-"
+        if ccall(:jl_generating_output, Cint, ()) == 1
+            @warn """
+            Enzyme.jl support for Julia 1.12 is presently in progress.
+			For the time being we recommend using 1.11 or LTS (1.10).
+
+            For latest updates, check the status of support for Julia 1.12+ at
+            https://github.com/EnzymeAD/Enzyme.jl/issues/2699.
+            """ maxlog = 1
+        end
+    end
+
+    return nothing
+end
+
 end # module