diff --git a/cl/_testdata/importpkg/out.ll b/cl/_testdata/importpkg/out.ll
index dc48a001..7097b520 100644
--- a/cl/_testdata/importpkg/out.ll
+++ b/cl/_testdata/importpkg/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.hello = global ptr null
+@main.hello = global [7 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testdata/method/out.ll b/cl/_testdata/method/out.ll
index cbec5de4..c8a40fd1 100644
--- a/cl/_testdata/method/out.ll
+++ b/cl/_testdata/method/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testdata/printf/out.ll b/cl/_testdata/printf/out.ll
index 02d042b6..fd92dcbe 100644
--- a/cl/_testdata/printf/out.ll
+++ b/cl/_testdata/printf/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.hello = global ptr null
+@main.hello = global [7 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testdata/printval/out.ll b/cl/_testdata/printval/out.ll
index 6b97f9ef..28677659 100644
--- a/cl/_testdata/printval/out.ll
+++ b/cl/_testdata/printval/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testdata/ptrmthd/out.ll b/cl/_testdata/ptrmthd/out.ll
index 79d70308..ff58cec0 100644
--- a/cl/_testdata/ptrmthd/out.ll
+++ b/cl/_testdata/ptrmthd/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testrt/gblarray/out.ll b/cl/_testrt/gblarray/out.ll
index d0f42446..c722d6d0 100644
--- a/cl/_testrt/gblarray/out.ll
+++ b/cl/_testrt/gblarray/out.ll
@@ -3,9 +3,9 @@ source_filename = "main"
 
 %"github.com/goplus/llgo/internal/abi.Type" = type { i64, i64, i32, i8, i8, i8, i8, { ptr, ptr }, ptr, i32, i32 }
 
-@main.basicTypes = global ptr null
+@main.basicTypes = global [25 x ptr] undef
 @"main.init$guard" = global ptr null
-@main.sizeBasicTypes = global ptr null
+@main.sizeBasicTypes = global [25 x i64] undef
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
 @0 = private unnamed_addr constant [20 x i8] c"Kind: %d, Size: %d\0A\00", align 1
diff --git a/cl/_testrt/hello/out.ll b/cl/_testrt/hello/out.ll
index f71fe323..f8cd7298 100644
--- a/cl/_testrt/hello/out.ll
+++ b/cl/_testrt/hello/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testrt/strlen/out.ll b/cl/_testrt/strlen/out.ll
index f71fe323..f8cd7298 100644
--- a/cl/_testrt/strlen/out.ll
+++ b/cl/_testrt/strlen/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testrt/struct/out.ll b/cl/_testrt/struct/out.ll
index 04ab01fc..2888d80f 100644
--- a/cl/_testrt/struct/out.ll
+++ b/cl/_testrt/struct/out.ll
@@ -3,7 +3,7 @@ source_filename = "main"
 
 %main.Foo = type { i32, i1 }
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/cl/_testrt/typalias/out.ll b/cl/_testrt/typalias/out.ll
index b77f76a7..bb9068ea 100644
--- a/cl/_testrt/typalias/out.ll
+++ b/cl/_testrt/typalias/out.ll
@@ -1,7 +1,7 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-@main.format = global ptr null
+@main.format = global [10 x i8] undef
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
diff --git a/internal/runtime/llgo_autogen.lla b/internal/runtime/llgo_autogen.lla
index ebb1ce75..4f9b4461 100644
Binary files a/internal/runtime/llgo_autogen.lla and b/internal/runtime/llgo_autogen.lla differ
diff --git a/ssa/decl.go b/ssa/decl.go
index fd8ecefc..7a30aac3 100644
--- a/ssa/decl.go
+++ b/ssa/decl.go
@@ -60,6 +60,7 @@ type NamedConst = *aNamedConst
 
 type aGlobal struct {
 	Expr
+	array bool
 }
 
 // A Global is a named Value holding the address of a package-level
@@ -72,8 +73,17 @@ func (p Package) NewVar(name string, typ types.Type, bg Background) Global {
 		return v
 	}
 	t := p.Prog.Type(typ, bg)
-	gbl := llvm.AddGlobal(p.mod, t.ll, name)
-	ret := &aGlobal{Expr{gbl, t}}
+	var gbl llvm.Value
+	var array bool
+	if t.kind == vkPtr && p.Prog.Elem(t).kind == vkArray {
+		typ := p.Prog.Elem(t).ll
+		gbl = llvm.AddGlobal(p.mod, typ, name)
+		gbl.SetInitializer(llvm.Undef(typ))
+		array = true
+	} else {
+		gbl = llvm.AddGlobal(p.mod, t.ll, name)
+	}
+	ret := &aGlobal{Expr{gbl, t}, array}
 	p.vars[name] = ret
 	return ret
 }
@@ -85,6 +95,9 @@ func (p Package) VarOf(name string) Global {
 
 // Init initializes the global variable with the given value.
 func (g Global) Init(v Expr) {
+	if g.array && v.kind == vkPtr {
+		return
+	}
 	g.impl.SetInitializer(v.impl)
 }