[Parser] Handle #pragma pack/align inside C structs.

Fixes PR13580. Patch by Serge Pavlov!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179743 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/ParseDecl.cpp

@@ -3230,6 +3230,16 @@ void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
       continue;
     }
 
+    if (Tok.is(tok::annot_pragma_pack)) {
+      HandlePragmaPack();
+      continue;
+    }
+
+    if (Tok.is(tok::annot_pragma_align)) {
+      HandlePragmaAlign();
+      continue;
+    }
+
     if (!Tok.is(tok::at)) {
       struct CFieldCallback : FieldCallback {
         Parser &P;

test/Parser/pragma-options.c

@@ -20,3 +20,15 @@
 #pragma align=reset
 #pragma align=mac68k
 #pragma align=power
+
+// PR13580
+struct S
+{
+  char a[3];
+#pragma align=packed
+  struct T
+  {
+    char b;
+    int c;
+  } d;
+};

test/Parser/pragma-pack.c

@@ -30,3 +30,17 @@
 
 _Pragma("pack(push)")
 /* expected-warning {{expected integer or identifier in '#pragma pack'}}*/ _Pragma("pack(push,)") 
+
+// PR13580
+struct S
+{
+  char a[3];
+#pragma pack(1)
+  struct T
+  {
+    char b;
+    int c;
+  } d;
+#pragma pack()
+  int e;
+};