This is awful

classes/internal-rust-cross.bbclass

@@ -9,7 +9,7 @@ PN = "rust-cross-${TARGET_ARCH}"
 
 # The same value as ${TOOLCHAIN_OPTIONS}. We can't use that variable directly
 # here because cross.bblcass is "helpful" and blanks it out.
-PRE_LINK_ARGS_PREPEND = "--sysroot=${STAGING_DIR_TARGET}"
+TARGET_PRE_LINK_ARGS_PREPEND = "--sysroot=${STAGING_DIR_TARGET}"
 
 ## gcc-cross settings
 # INHIBIT_DEFAULT_DEPS = "1"

recipes/rust/rust.inc

@@ -113,7 +113,8 @@ def rust_gen_target(d, thing, wd):
     features = d.getVarFlag('FEATURES', arch, True) or ""
 
     pre_link_args = (d.getVarFlag('PRE_LINK_ARGS', arch, True) or "").split()
-    pre_link_args.extend((d.getVar('PRE_LINK_ARGS_PREPEND', True) or "").split())
+    if thing == 'TARGET':
+        pre_link_args.extend((d.getVar('TARGET_PRE_LINK_ARGS_PREPEND', True) or "").split())
 
     o.write('''{{
          "data-layout": "{}",