[IR] Allow attributes with global variables

This patch extends llvm-ir to allow attributes to be set on global variables.
An RFC was sent out earlier by my colleague James Molloy: http://lists.llvm.org/pipermail/cfe-dev/2017-March/053100.html
A key part of that proposal was to extend LLVM-IR to carry attributes on global variables.
This generic feature could be useful for multiple purposes.
In our present context, it would be useful to carry user specified sections for bss/rodata/data.

Reviewed by: Jonathan Roelofs, Reid Kleckner
Differential Revision: https://reviews.llvm.org/D32009

llvm-svn: 302794

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/IR/Globals.cpp b/llvm/lib/IR/Globals.cpp
index 5f338f58d94..5fbf51e0089 100644
--- a/llvm/lib/IR/Globals.cpp
+++ b/llvm/lib/IR/Globals.cpp
@@ -338,6 +338,7 @@ void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) {
   if (const GlobalVariable *SrcVar = dyn_cast<GlobalVariable>(Src)) {
     setThreadLocalMode(SrcVar->getThreadLocalMode());
     setExternallyInitialized(SrcVar->isExternallyInitialized());
+    setAttributes(SrcVar->getAttributes());
   }
 }