--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/internal_linkage.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -fdouble-square-bracket-attributes %s
+
+int var __attribute__((internal_linkage));
+int var2 __attribute__((internal_linkage,common)); // expected-error{{'common' and 'internal_linkage' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}
+int var3 __attribute__((common,internal_linkage)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}
+
+int var4 __attribute__((common)); // expected-error{{'common' and 'internal_linkage' attributes are not compatible}} \
+// expected-note{{previous definition is here}}
+int var4 __attribute__((internal_linkage)); // expected-note{{conflicting attribute is here}} \
+// expected-error{{'internal_linkage' attribute does not appear on the first declaration of 'var4'}}
+
+int var5 __attribute__((internal_linkage)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}}
+int var5 __attribute__((common)); // expected-note{{conflicting attribute is here}}
+
+__attribute__((internal_linkage)) int f() {}
+struct __attribute__((internal_linkage)) S { // expected-warning{{'internal_linkage' attribute only applies to variables, functions, and classes}}
+};
+
+__attribute__((internal_linkage("foo"))) int g() {} // expected-error{{'internal_linkage' attribute takes no arguments}}
+
+int var6 [[clang::internal_linkage]];
+int var7 [[clang::internal_linkage]] __attribute__((common)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}
+__attribute__((common)) int var8 [[clang::internal_linkage]]; // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}