Add an optional --debug-mozjs argument to `mach build` that enables a non-optimized, debug build of mozjs and rust-mozjs. Update the Cargo snapshot to enable new feature support.

1 files changed, 12 insertions, 1 deletions

diff --git a/python/servo/build_commands.py b/python/servo/build_commands.py
index 5a7316a9b97..7dd4b3995f5 100644
--- a/python/servo/build_commands.py
+++ b/python/servo/build_commands.py
@@ -31,11 +31,15 @@ class MachCommands(CommandBase):
                      default=None,
                      action='store_true',
                      help='Build for Android')
+    @CommandArgument('--debug-mozjs',
+                     default=None,
+                     action='store_true',
+                     help='Enable debug assertions in mozjs')
     @CommandArgument('--verbose', '-v',
                      action='store_true',
                      help='Print verbose output')
     def build(self, target=None, release=False, jobs=None, android=None,
-              verbose=False):
+              verbose=False, debug_mozjs=False):
         self.ensure_bootstrapped()
 
         if android is None:
@@ -51,6 +55,13 @@ class MachCommands(CommandBase):
         if verbose:
             opts += ["-v"]
 
+        features = []
+        if debug_mozjs:
+            features += ["script/debugmozjs"]
+
+        if features:
+            opts += ["--features", "%s" % ' '.join(features)]
+
         build_start = time()
         if android:
             make_opts = []