From 30864196acee0c474d224b641f289e2dfa418d5f Mon Sep 17 00:00:00 2001
From: asterite <asterite@gmail.com>
Date: Thu, 8 Feb 2018 09:00:42 -0300
Subject: [PATCH] Fix incorrect type for lib extern static array

---
 spec/compiler/codegen/lib_spec.cr          | 10 ++++++++++
 src/compiler/crystal/codegen/llvm_typer.cr |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/spec/compiler/codegen/lib_spec.cr b/spec/compiler/codegen/lib_spec.cr
index 48762e4f9726..e899bcf6d2cf 100644
--- a/spec/compiler/codegen/lib_spec.cr
+++ b/spec/compiler/codegen/lib_spec.cr
@@ -227,4 +227,14 @@ describe "Code gen: lib" do
       LibFoo.foo(x)
       ))
   end
+
+  it "uses static array in lib extern (#5688)" do
+    codegen(%(
+      lib LibFoo
+        $x : Int32[10]
+      end
+
+      LibFoo.x
+      ))
+  end
 end
diff --git a/src/compiler/crystal/codegen/llvm_typer.cr b/src/compiler/crystal/codegen/llvm_typer.cr
index 8bcb4e3bad4d..7be68a3e5bf2 100644
--- a/src/compiler/crystal/codegen/llvm_typer.cr
+++ b/src/compiler/crystal/codegen/llvm_typer.cr
@@ -452,6 +452,12 @@ module Crystal
       end
     end
 
+    # StaticArray can only be "returned" in lib externs,
+    # not in C functions, and there it must not be a pointer.
+    def llvm_c_return_type(type : StaticArrayInstanceType)
+      llvm_struct_type(type)
+    end
+
     def llvm_c_return_type(type : NilType)
       @llvm_context.void
     end