test(clang-cl): anonymous bitfield, union, alignas, derived padding

Author: Théo De Magalhaes

clang/test/Driver/windows-Wpadded-alignas.cpp

@@ -0,0 +1,12 @@
+// RUN: %clang_cl -Wpadded -Wno-msvc-not-found -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+// RUN: %clang -Wpadded -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+
+struct __attribute__((ms_struct)) AlignedStruct {
+  char c;
+  alignas(8) int i;
+};
+
+int main() {AlignedStruct s;}
+
+// WARN: warning: padding struct 'AlignedStruct' with 7 bytes to align 'i'
+// WARN: warning: padding size of 'AlignedStruct' with 4 bytes to alignment boundary

clang/test/Driver/windows-Wpadded-anonymous-bitfield.cpp

@@ -0,0 +1,12 @@
+// RUN: %clang_cl -Wpadded -Wno-msvc-not-found -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+
+struct __attribute__((ms_struct)) BitfieldStruct {
+  char c : 1;
+  int : 0;
+  char i;
+};
+
+int main() {BitfieldStruct s;}
+
+// WARN: warning: padding struct 'BitfieldStruct' with 31 bits to align anonymous bit-field
+// WARN: warning: padding size of 'BitfieldStruct' with 3 bytes to alignment boundary 

clang/test/Driver/windows-Wpadded-derived-struct.cpp

@@ -0,0 +1,13 @@
+// RUN: %clang_cl -Wpadded -Wno-msvc-not-found -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+// RUN: %clang -Wpadded -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+
+struct Base {
+  int b;
+};
+
+struct Derived : public Base {
+  char c;
+};
+
+int main() {Derived d;}
+// WARN: warning: padding size of 'Derived' with 3 bytes to alignment boundary

clang/test/Driver/windows-Wpadded-union.cpp

@@ -0,0 +1,19 @@
+// RUN: %clang_cl -Wpadded -Wno-msvc-not-found -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+// RUN: %clang -Wpadded -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+
+union __attribute__((ms_struct)) Union {
+  char c;
+  long long u;
+};
+
+struct __attribute__((ms_struct)) StructWithUnion {
+  char c;
+  int : 0;
+  Union t;
+  short i;
+};
+
+int main() { StructWithUnion s; }
+
+// WARN: warning: padding struct 'StructWithUnion' with 7 bytes to align 't'
+// WARN: warning: padding size of 'StructWithUnion' with 6 bytes to alignment boundary

clang/test/Driver/windows-Wpadded.cpp

@@ -1,6 +1,7 @@
 // RUN: %clang_cl -Wpadded -Wno-msvc-not-found -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
+// RUN: %clang -Wpadded -fsyntax-only -- %s 2>&1 | FileCheck -check-prefix=WARN %s
 
-struct Foo {
+struct __attribute__((ms_struct)) Foo {
   int b : 1;
   char a;
 };