1 files changed, 120 insertions, 0 deletions
diff --git a/clang/test/Misc/caret-diags-macros.c b/clang/test/Misc/caret-diags-macros.c
new file mode 100644
index 0000000..de1ee76
--- /dev/null
+++ b/clang/test/Misc/caret-diags-macros.c
@@ -0,0 +1,120 @@
+// RUN: %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck %s
+
+#define M1(x) x
+#define M2 1;
+void foo() {
+  M1(
+    M2);
+  // CHECK: :7:{{[0-9]+}}: warning: expression result unused
+  // CHECK: :4:{{[0-9]+}}: note: expanded from macro 'M2'
+  // CHECK: :3:{{[0-9]+}}: note: expanded from macro 'M1'
+}
+
+#define A 1
+#define B A
+#define C B
+void bar() {
+  C;
+  // CHECK: :17:3: warning: expression result unused
+  // CHECK: :15:11: note: expanded from macro 'C'
+  // CHECK: :14:11: note: expanded from macro 'B'
+  // CHECK: :13:11: note: expanded from macro 'A'
+}
+
+// rdar://7597492
+#define sprintf(str, A, B) \
+__builtin___sprintf_chk (str, 0, 42, A, B)
+
+void baz(char *Msg) {
+  sprintf(Msg,  "  sizeof FoooLib            : =%3u\n",   12LL);
+}
+
+
+// PR9279: comprehensive tests for multi-level macro back traces
+#define macro_args1(x) x
+#define macro_args2(x) macro_args1(x)
+#define macro_args3(x) macro_args2(x)
+
+#define macro_many_args1(x, y, z) y
+#define macro_many_args2(x, y, z) macro_many_args1(x, y, z)
+#define macro_many_args3(x, y, z) macro_many_args2(x, y, z)
+
+void test() {
+  macro_args3(1);
+  // CHECK: {{.*}}:43:15: warning: expression result unused
+  // Also check that the 'caret' printing agrees with the location here where
+  // its easy to FileCheck.
+  // CHECK-NEXT: macro_args3(1);
+  // CHECK-NEXT: ~~~~~~~~~~~~^~
+  // CHECK: {{.*}}:36:36: note: expanded from macro 'macro_args3'
+  // CHECK: {{.*}}:35:36: note: expanded from macro 'macro_args2'
+  // CHECK: {{.*}}:34:24: note: expanded from macro 'macro_args1'
+
+  macro_many_args3(
+    1,
+    2,
+    3);
+  // CHECK: {{.*}}:55:5: warning: expression result unused
+  // CHECK: {{.*}}:40:55: note: expanded from macro 'macro_many_args3'
+  // CHECK: {{.*}}:39:55: note: expanded from macro 'macro_many_args2'
+  // CHECK: {{.*}}:38:35: note: expanded from macro 'macro_many_args1'
+
+  macro_many_args3(
+    1,
+    M2,
+    3);
+  // CHECK: {{.*}}:64:5: warning: expression result unused
+  // CHECK: {{.*}}:4:12: note: expanded from macro 'M2'
+  // CHECK: {{.*}}:40:55: note: expanded from macro 'macro_many_args3'
+  // CHECK: {{.*}}:39:55: note: expanded from macro 'macro_many_args2'
+  // CHECK: {{.*}}:38:35: note: expanded from macro 'macro_many_args1'
+
+  macro_many_args3(
+    1,
+    macro_args2(2),
+    3);
+  // CHECK: {{.*}}:74:17: warning: expression result unused
+  // This caret location needs to be printed *inside* a different macro's
+  // arguments.
+  // CHECK-NEXT: macro_args2(2),
+  // CHECK-NEXT: ~~~~~~~~~~~~^~~
+  // CHECK: {{.*}}:35:36: note: expanded from macro 'macro_args2'
+  // CHECK: {{.*}}:34:24: note: expanded from macro 'macro_args1'
+  // CHECK: {{.*}}:40:55: note: expanded from macro 'macro_many_args3'
+  // CHECK: {{.*}}:39:55: note: expanded from macro 'macro_many_args2'
+  // CHECK: {{.*}}:38:35: note: expanded from macro 'macro_many_args1'
+}
+
+#define variadic_args1(x, y, ...) y
+#define variadic_args2(x, ...) variadic_args1(x, __VA_ARGS__)
+#define variadic_args3(x, y, ...) variadic_args2(x, y, __VA_ARGS__)
+
+void test2() {
+  variadic_args3(1, 2, 3, 4);
+  // CHECK: {{.*}}:93:21: warning: expression result unused
+  // CHECK-NEXT: variadic_args3(1, 2, 3, 4);
+  // CHECK-NEXT: ~~~~~~~~~~~~~~~~~~^~~~~~~~
+  // CHECK: {{.*}}:90:53: note: expanded from macro 'variadic_args3'
+  // CHECK: {{.*}}:89:50: note: expanded from macro 'variadic_args2'
+  // CHECK: {{.*}}:88:35: note: expanded from macro 'variadic_args1'
+}
+
+#define variadic_pasting_args1(x, y, z) y
+#define variadic_pasting_args2(x, ...) variadic_pasting_args1(x ## __VA_ARGS__)
+#define variadic_pasting_args2a(x, y, ...) variadic_pasting_args1(x, y ## __VA_ARGS__)
+#define variadic_pasting_args3(x, y, ...) variadic_pasting_args2(x, y, __VA_ARGS__)
+#define variadic_pasting_args3a(x, y, ...) variadic_pasting_args2a(x, y, __VA_ARGS__)
+
+void test3() {
+  variadic_pasting_args3(1, 2, 3, 4);
+  // CHECK: {{.*}}:109:32: warning: expression result unused
+  // CHECK: {{.*}}:105:72: note: expanded from macro 'variadic_pasting_args3'
+  // CHECK: {{.*}}:103:68: note: expanded from macro 'variadic_pasting_args2'
+  // CHECK: {{.*}}:102:41: note: expanded from macro 'variadic_pasting_args1'
+
+  variadic_pasting_args3a(1, 2, 3, 4);
+  // CHECK: {{.*}}:115:30: warning: expression result unused
+  // CHECK: {{.*}}:106:71: note: expanded from macro 'variadic_pasting_args3a'
+  // CHECK: {{.*}}:104:70: note: expanded from macro 'variadic_pasting_args2a'
+  // CHECK: {{.*}}:102:41: note: expanded from macro 'variadic_pasting_args1'
+}