when -Zrandomize-layout is enabled disable alloc test testing internal struct sizes

Author: the8472

library/alloc/Cargo.toml

@@ -52,4 +52,5 @@ check-cfg = [
 'cfg(no_global_oom_handling)',
 'cfg(no_rc)',
 'cfg(no_sync)',
+'cfg(randomized_layouts)',
 ]

library/alloc/src/collections/btree/node/tests.rs

@@ -90,7 +90,7 @@ fn test_partial_eq() {
 
 #[test]
 #[cfg(target_arch = "x86_64")]
-#[cfg_attr(miri, ignore)]// We'd like to run Miri with layout randomization
+#[cfg_attr(any(miri, randomized_layouts), ignore)]// We'd like to run Miri with layout randomization
 fntest_sizes(){
 assert_eq!(core::mem::size_of::<LeafNode<(),()>>(),16);
 assert_eq!(core::mem::size_of::<LeafNode<i64,i64>>(),16 + CAPACITY*2*8);

src/bootstrap/src/core/builder.rs

@@ -2193,6 +2193,9 @@ impl<'a> Builder<'a> {
  rustflags.arg("-Zvalidate-mir");
  rustflags.arg(&format!("-Zmir-opt-level={mir_opt_level}"));
 }
+ifself.config.rust_randomize_layout{
+ rustflags.arg("--cfg=randomized_layouts");
+}
 // Always enable inlining MIR when building the standard library.
 // Without this flag, MIR inlining is disabled when incremental compilation is enabled.
 // That causes some mir-opt tests which inline functions from the standard library to