Implement C++17 P0386R2, inline variables. (The 'inline' specifier gives a
variable weak discardable linkage and partially-ordered initialization, and is
implied for constexpr static data members.)
llvm-svn: 273754
diff --git a/clang/test/CodeGenCXX/cxx1z-inline-variables.cpp b/clang/test/CodeGenCXX/cxx1z-inline-variables.cpp
new file mode 100644
index 0000000..90d0ed6
--- /dev/null
+++ b/clang/test/CodeGenCXX/cxx1z-inline-variables.cpp
@@ -0,0 +1,63 @@
+// RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
+
+struct Q {
+ // CHECK: @_ZN1Q1kE = linkonce_odr constant i32 5, comdat
+ static constexpr int k = 5;
+};
+const int &r = Q::k;
+
+int f();
+
+// const does not imply internal linkage.
+// CHECK: @external_inline = linkonce_odr constant i32 5, comdat
+inline const int external_inline = 5;
+const int &use1 = external_inline;
+
+// static still does, though.
+// CHECK: @_ZL15internal_inline = internal constant i32 5
+static inline const int internal_inline = 5;
+const int &use2 = internal_inline;
+
+int a = f();
+// CHECK: @b = linkonce_odr global i32 0, comdat
+// CHECK: @_ZGV1b = linkonce_odr global i64 0, comdat($b)
+inline int b = f();
+int c = f();
+
+template<typename T> struct X {
+ static int a;
+ static inline int b;
+ static int c;
+};
+// CHECK: @_ZN1XIiE1aE = linkonce_odr global i32 10
+// CHECK: @_ZN1XIiE1bE = global i32 20
+// CHECK-NOT: @_ZN1XIiE1cE
+template<> inline int X<int>::a = 10;
+int &use3 = X<int>::a;
+template<> int X<int>::b = 20;
+template<> inline int X<int>::c = 30;
+
+// CHECK-LABEL: define {{.*}}global_var_init
+// CHECK: call i32 @_Z1fv
+
+// CHECK-LABEL: define {{.*}}global_var_init
+// CHECK-NOT: comdat
+// CHECK-SAME: {{$}}
+// CHECK: load atomic {{.*}} acquire
+// CHECK: br
+// CHECK: __cxa_guard_acquire(i64* @_ZGV1b)
+// CHECK: br
+// CHECK: call i32 @_Z1fv
+// CHECK: __cxa_guard_release(i64* @_ZGV1b)
+
+// CHECK-LABEL: define {{.*}}global_var_init
+// CHECK: call i32 @_Z1fv
+
+template<typename T> inline int d = f();
+int e = d<int>;
+
+// CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat
+// CHECK: _ZGV1dIiE
+// CHECK-NOT: __cxa_guard_acquire(i64* @_ZGV1b)
+// CHECK: call i32 @_Z1fv
+// CHECK-NOT: __cxa_guard_release(i64* @_ZGV1b)