From e58629b990ee8ca2dc8fde0703fc7ca2b4b2a809 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Thu, 19 Apr 2018 14:51:59 -0700
Subject: [PATCH] wasm: Increase default stack size to 1MB

This commit increases the dfeault stack size allocated to the
wasm32-unknown-unknown target to 1MB by default. Currently the default stack
size is one wasm page, or 64 kilobytes. This default stack is quite small and
has caused a stack overflow or two in the wild by accident.

The current "best practice" for fixing this is to pass `-Clink-args='-z
stack-size=$bigger'` but that's not great nor always easy to do. A default of
1MB matches more closely with other platforms where it's "pretty big" by
default.

Note that it was tested and if the users uses `-C link-args` to pass a custom
stack size that's still resepected as lld seems to take the first argument, and
where rustc is passing it will always be last.
---
 src/librustc_trans/back/linker.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/librustc_trans/back/linker.rs b/src/librustc_trans/back/linker.rs
index ebcf06d63be..e001e809ee5 100644
--- a/src/librustc_trans/back/linker.rs
+++ b/src/librustc_trans/back/linker.rs
@@ -960,6 +960,7 @@ impl Linker for WasmLd {
 
     fn finalize(&mut self) -> Command {
         self.cmd.arg("--threads");
+        self.cmd.arg("-z").arg("stack-size=1048576");
 
         // FIXME we probably shouldn't pass this but instead pass an explicit
         // whitelist of symbols we'll allow to be undefined. Unfortunately