build_diff.txt

-load("//third_party/linux_sgx:sgx_sdk.bzl", "sgx_enclave")
+load("//third_party/linux_sgx:sgx_sdk.bzl", "sgx_enclave", "sgx_enclave_configuration")

+sgx_enclave_configuration(
+  name = "demo_enclave_configuration", 
+  heap_max_size = "0x6400000", 
+)

sgx_enclave(
     name = "demo_enclave",
     srcs = [
      ...
      ],
+    config = ":demo_enclave_configuration",
     deps = [...