1 files changed, 57 insertions, 0 deletions
diff --git a/clang/test/Misc/macro-backtrace.c b/clang/test/Misc/macro-backtrace.c
new file mode 100644
index 0000000..7aeaf21
--- /dev/null
+++ b/clang/test/Misc/macro-backtrace.c
@@ -0,0 +1,57 @@
+// Tests for macro expansion backtraces. The RUN and CHECK lines are grouped
+// below the test code to reduce noise when updating them.
+
+#define M1(A, B) ((A) < (B))
+#define M2(A, B) M1(A, B)
+#define M3(A, B) M2(A, B)
+#define M4(A, B) M3(A, B)
+#define M5(A, B) M4(A, B)
+#define M6(A, B) M5(A, B)
+#define M7(A, B) M6(A, B)
+#define M8(A, B) M7(A, B)
+#define M9(A, B) M8(A, B)
+#define M10(A, B) M9(A, B)
+#define M11(A, B) M10(A, B)
+#define M12(A, B) M11(A, B)
+
+void f(int *ip, float *fp) {
+  if (M12(ip, fp)) { }
+  // RUN: %clang_cc1 -fsyntax-only -fmacro-backtrace-limit 5 %s 2>&1 \
+  // RUN:   | FileCheck %s -check-prefix=CHECK-LIMIT
+  // CHECK-LIMIT: macro-backtrace.c:18:7: warning: comparison of distinct pointer types ('int *' and 'float *')
+  // CHECK-LIMIT: if (M12(ip, fp)) { }
+  // CHECK-LIMIT: macro-backtrace.c:15:19: note: expanded from macro 'M12'
+  // CHECK-LIMIT: #define M12(A, B) M11(A, B)
+  // CHECK-LIMIT: macro-backtrace.c:14:19: note: expanded from macro 'M11'
+  // CHECK-LIMIT: #define M11(A, B) M10(A, B)
+  // CHECK-LIMIT: note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
+  // CHECK-LIMIT: macro-backtrace.c:6:18: note: expanded from macro 'M3'
+  // CHECK-LIMIT: #define M3(A, B) M2(A, B)
+  // CHECK-LIMIT: macro-backtrace.c:5:18: note: expanded from macro 'M2'
+  // CHECK-LIMIT: #define M2(A, B) M1(A, B)
+  // CHECK-LIMIT: macro-backtrace.c:4:23: note: expanded from macro 'M1'
+  // CHECK-LIMIT: #define M1(A, B) ((A) < (B))
+
+  // RUN: %clang_cc1 -fsyntax-only -fno-caret-diagnostics %s 2>&1 \
+  // RUN:   | FileCheck %s -check-prefix=CHECK-NO-CARETS
+  // CHECK-NO-CARETS: macro-backtrace.c:18:7: warning: comparison of distinct pointer types ('int *' and 'float *')
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:15:19: note: expanded from macro 'M12'
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:14:19: note: expanded from macro 'M11'
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:13:19: note: expanded from macro 'M10'
+  // CHECK-NO-CARETS-NEXT: note: (skipping 6 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:6:18: note: expanded from macro 'M3'
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:5:18: note: expanded from macro 'M2'
+  // CHECK-NO-CARETS-NEXT: macro-backtrace.c:4:23: note: expanded from macro 'M1'
+
+  // Check that the expansion notes respect the same formatting options as
+  // other diagnostics.
+  // RUN: %clang_cc1 -fsyntax-only -fdiagnostics-format vi %s 2>&1 \
+  // RUN:   | FileCheck %s -check-prefix=CHECK-NOTE-FORMAT
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +18:7: warning:
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +15:19: note:
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +14:19: note:
+  // CHECK-NOTE-FORMAT: note:
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +6:18: note:
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +5:18: note:
+  // CHECK-NOTE-FORMAT: macro-backtrace.c +4:23: note:
+}