Bug 1577046 - Tie extra-bindgen-flags file creation to cranelift. r=chmanchester

We only recurse into js/src/rust when jsrust is built, which it may not
be in Gecko builds. But cranelift, which may be enabled either way,
needs the extra-bindgen-flags file.

Differential Revision: https://phabricator.services.mozilla.com/D43699

--HG--
extra : moz-landing-system : lando

js/src/moz.build

@@ -47,6 +47,9 @@ for stlfile in ['jsdate.*', 'jsnum.*']:
 with Files('builtin/intl/*'):
     BUG_COMPONENT = component_intl
 
+if CONFIG['ENABLE_WASM_CRANELIFT']:
+    CONFIGURE_SUBST_FILES += ['rust/extra-bindgen-flags']
+
 if not CONFIG['JS_DISABLE_SHELL']:
     DIRS += [
         'rust',

js/src/rust/moz.build

@@ -18,8 +18,6 @@ if CONFIG['ENABLE_WASM_CRANELIFT']:
 
 RustLibrary('jsrust', features)
 
-CONFIGURE_SUBST_FILES += ['extra-bindgen-flags']
-
 if CONFIG['JS_SHARED_LIBRARY']:
     FINAL_LIBRARY = 'js'