From b7394b22fd7ba13345b792b2d028461b457efbb4 Mon Sep 17 00:00:00 2001
From: Andrew Wilkins <axwalk@gmail.com>
Date: Fri, 27 Nov 2015 04:46:46 +0000
Subject: [PATCH] [llgo] Force exporting __morestack from llgoi

Summary:
Force exporting __morestack from llgoi, so that
the symbol is available to the execution engine
when linking with libLLVM.so. The engine does
not reference __morestack explicitly, so must
be provided by the host program.

Reviewers: pcc

Subscribers: axw, llvm-commits

Differential Revision: http://reviews.llvm.org/D12625

llvm-svn: 254188
---
 llgo/cmd/llgoi/llgoi.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/llgo/cmd/llgoi/llgoi.go b/llgo/cmd/llgoi/llgoi.go
index e6e021be233e..401e8f34df27 100644
--- a/llgo/cmd/llgoi/llgoi.go
+++ b/llgo/cmd/llgoi/llgoi.go
@@ -38,6 +38,12 @@ import (
 	"llvm.org/llvm/bindings/go/llvm"
 )
 
+// /* Force exporting __morestack if it's available, so that it is
+//    available to the engine when linking with libLLVM.so. */
+//
+// void *__morestack __attribute__((weak));
+import "C"
+
 func getInstPrefix() (string, error) {
 	path, err := exec.LookPath(os.Args[0])
 	if err != nil {