[Diagnostic] Add ftabstop to -Wmisleading-indentation

Summary:
this allow much better support of codebases like the linux kernel that mix tabs and spaces.

-ftabstop=//Width// allow specifying how large tabs are considered to be.

Reviewers: xbolva00, aaron.ballman, rsmith

Reviewed By: aaron.ballman

Subscribers: jyknight, riccibruno, rsmith, nathanchance

Differential Revision: https://reviews.llvm.org/D71037

1 files changed, 81 insertions, 2 deletions

diff --git a/clang/test/Parser/warn-misleading-indentation.cpp b/clang/test/Parser/warn-misleading-indentation.cpp
index d366db767e6..08d1ee262a3 100644
--- a/clang/test/Parser/warn-misleading-indentation.cpp
+++ b/clang/test/Parser/warn-misleading-indentation.cpp
@@ -1,7 +1,9 @@
 // RUN: %clang_cc1 -x c -fsyntax-only -verify %s
-// RUN: %clang_cc1 -x c -fsyntax-only -verify -Wmisleading-indentation -DWITH_WARN %s
-// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify -Wall -Wno-unused -DWITH_WARN -DCXX17 %s
 // RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify -Wall -Wno-unused -Wno-misleading-indentation -DCXX17 %s
+// RUN: %clang_cc1 -x c -fsyntax-only -verify -Wmisleading-indentation -DWITH_WARN -ftabstop 8 -DTAB_SIZE=8 %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify -Wall -Wno-unused -DWITH_WARN  -ftabstop 4 -DTAB_SIZE=4 -DCXX17 %s
+// RUN: %clang_cc1 -x c -fsyntax-only -verify -Wall -Wno-unused -DWITH_WARN -ftabstop 1 -DTAB_SIZE=1 %s
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify -Wall -Wno-unused -Wmisleading-indentation -DCXX17 -DWITH_WARN -ftabstop 2 -DTAB_SIZE=2 %s
 
 #ifndef WITH_WARN
 // expected-no-diagnostics
@@ -225,3 +227,80 @@ void s(int num) {
 // expected-warning@-2 {{misleading indentation; statement is not part of the previous 'if'}}
 #endif
 }
+int a4()
+{
+	if (0)
+		return 1;
+ 	return 0;
+#if (TAB_SIZE == 1)
+// expected-warning@-2 {{misleading indentation; statement is not part of the previous 'if'}}
+// expected-note@-5 {{here}}
+#endif 
+}
+
+int a5()
+{
+	if (0)
+		return 1;
+		return 0;
+#if WITH_WARN
+// expected-warning@-2 {{misleading indentation; statement is not part of the previous 'if'}}
+// expected-note@-5 {{here}}
+#endif
+}
+
+int a6()
+{
+	if (0)
+		return 1;
+      		return 0;
+#if (TAB_SIZE == 8)
+// expected-warning@-2 {{misleading indentation; statement is not part of the previous 'if'}}
+// expected-note@-5 {{here}}
+#endif
+}
+
+#define FOO \
+ goto fail
+
+int main(int argc, char* argv[]) {
+  if (5 != 0)
+    goto fail;
+  else
+    goto fail;
+
+  if (1) {
+    if (1)
+      goto fail;
+    else if (1)
+      goto fail;
+    else if (1)
+      goto fail;
+    else
+      goto fail;
+  } else if (1) {
+    if (1)
+      goto fail;
+  }
+
+  if (1) {
+    if (1)
+      goto fail;
+  } else if (1)
+    goto fail;
+
+
+  if (1) goto fail; goto fail;
+
+    if (0)
+        goto fail;
+
+    goto fail;
+
+    if (0)
+        FOO;
+
+    goto fail;
+
+fail:;
+}