From 0d1946a7821d3aab70b77dba4fd367f728cded81 Mon Sep 17 00:00:00 2001
From: Brian Carroll <brian.carroll.ireland@gmail.com>
Date: Thu, 4 Nov 2021 20:50:32 +0000
Subject: [PATCH] Don't generate a DataSection unless we actually need it!

---
 compiler/gen_wasm/src/wasm_module/sections.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler/gen_wasm/src/wasm_module/sections.rs b/compiler/gen_wasm/src/wasm_module/sections.rs
index 27f8d8ff45..782a97b043 100644
--- a/compiler/gen_wasm/src/wasm_module/sections.rs
+++ b/compiler/gen_wasm/src/wasm_module/sections.rs
@@ -516,7 +516,10 @@ impl<'a> DataSection<'a> {
 
 impl Serialize for DataSection<'_> {
     fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
-        serialize_vector_section(buffer, SectionId::Data, &self.segments);
+        let total_payload_size = self.segments.iter().map(|seg| seg.init.len()).sum();
+        if total_payload_size > 0 {
+            serialize_vector_section(buffer, SectionId::Data, &self.segments);
+        }
     }
 }