From dd0bc3237e70f4c3f392e6c8960f2dcb1430261d Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Fri, 3 Sep 2021 15:43:55 -0700
Subject: [PATCH] Do not write a DWARF section if it is empty

There is no point in writing an empty DWARF section, and this will make our ELF
files a tiny bit smaller.
---
 crates/cranelift/src/debug/write_debuginfo.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/cranelift/src/debug/write_debuginfo.rs b/crates/cranelift/src/debug/write_debuginfo.rs
index a82796cb34..561b90ef00 100644
--- a/crates/cranelift/src/debug/write_debuginfo.rs
+++ b/crates/cranelift/src/debug/write_debuginfo.rs
@@ -54,6 +54,9 @@ fn emit_dwarf_sections(
     sections.for_each_mut(|id, s| -> anyhow::Result<()> {
         let name = id.name();
         let body = s.writer.take();
+        if body.is_empty() {
+            return Ok(());
+        }
         let mut relocs = vec![];
         ::std::mem::swap(&mut relocs, &mut s.relocs);
         result.push(DwarfSection { name, body, relocs });