Make a first pass at implementing -Wglobal-constructors. I'm worried that this

will end up bizarrely mirroring CGExprConstant, but that might be the hazard of
this feature.

llvm-svn: 109984

1 files changed, 39 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-global-constructors.cpp b/clang/test/SemaCXX/warn-global-constructors.cpp
new file mode 100644
index 00000000000..6d0709c5b79
--- /dev/null
+++ b/clang/test/SemaCXX/warn-global-constructors.cpp
@@ -0,0 +1,39 @@
+// RUN: %clang_cc1 -fsyntax-only -Wglobal-constructors %s -verify
+
+int opaque_int();
+
+namespace test0 {
+  // These should never require global constructors.
+  int a;
+  int b = 20;
+  float c = 5.0f;
+
+  // This global constructor is avoidable based on initialization order.
+  int d = b; // expected-warning {{global constructor}}
+
+  // These global constructors are unavoidable.
+  int e = opaque_int(); // expected-warning {{global constructor}}
+  int f = b; // expected-warning {{global constructor}}
+}
+
+namespace test1 {
+  struct A { int x; };
+  A a;
+  A b = A();
+  A c = { 10 };
+  A d = { opaque_int() }; // expected-warning {{global constructor}}
+}
+
+namespace test2 {
+  struct A { A(); };
+  A a; // expected-warning {{global constructor}}
+  A b[10]; // expected-warning {{global constructor}}
+  A c[10][10]; // expected-warning {{global constructor}}
+}
+
+namespace test3 {
+  struct A { ~A(); };
+  A a; // expected-warning {{global destructor}}
+  A b[10]; // expected-warning {{global destructor}}
+  A c[10][10]; // expected-warning {{global destructor}}
+}