delete JULIA_PYTHONCALL_LIBPTR

Author: Christopher Doris

src/cpython/context.jl

@@ -48,6 +48,10 @@ function init_context()
             # this ensures PyCall uses the same Python interpreter
             get!(ENV, "PYTHON", exe_path)
         end
+        # On success, delete JULIA_PYTHONCALL_LIBPTR so that further processes do not think
+        # they are embedded in Python (e.g. this can happen when precompiling).
+        # See https://github.com/cjdoris/PythonCall.jl/issues/235
+        delete!(ENV, "JULIA_PYTHONCALL_LIBPTR")
     else
         # Find Python executable
         exe_path = get(ENV, "JULIA_PYTHONCALL_EXE", "")