From 77ab9f209a42e85272f6d536ff4768607db9dd5f Mon Sep 17 00:00:00 2001
From: Matt Leon <mattleon@google.com>
Date: Fri, 28 Aug 2026 16:33:57 -0400
Subject: [PATCH] build/cpp: add additional copts and linkopts to run wasm
 modules with longjmp

Signed-off-by: Matt Leon <mattleon@google.com>
---
 bazel/defs.bzl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bazel/defs.bzl b/bazel/defs.bzl
index 0bba512..bf26066 100644
--- a/bazel/defs.bzl
+++ b/bazel/defs.bzl
@@ -23,9 +23,11 @@ def _optimized_wasm_cc_binary_transition_impl(settings, attr):
     copts = list(settings["//command_line_option:copt"])
     copts.append("-O3")
     copts.append("-DSTANDALONE_WASM")
+    copts.append("-fwasm-exceptions")
 
     linkopts = list(settings["//command_line_option:linkopt"])
     linkopts.append("-O3")
+    linkopts.append("-sSUPPORT_LONGJMP=wasm")
 
     features = list(settings["//command_line_option:features"])
     # Enable native wasm exceptions, see https://emscripten.org/docs/porting/exceptions.html.