Show Clang warnings and fix warnings we were causing with missing semicolons

src/clang_parser.cpp

@@ -142,16 +142,16 @@ void ClangParser::parse(ast::Program *program, StructMap &structs)
     },
   };
 
-  CXIndex index = clang_createIndex(0, 0);
+  CXIndex index = clang_createIndex(1, 1);
   CXTranslationUnit translation_unit;
   const char * const args[] = {
-    "-I/bpftrace/include"
+    "-I", "/bpftrace/include",
   };
   CXErrorCode error = clang_parseTranslationUnit2(
       index,
       "definitions.h",
-      args, 1,
-      unsaved_files, 7,
+      args, sizeof(args)/sizeof(char*),
+      unsaved_files, sizeof(unsaved_files)/sizeof(CXUnsavedFile),
       CXTranslationUnit_None,
       &translation_unit);
   if (error)

src/parser.yy

@@ -119,7 +119,7 @@ program : c_definitions probes { driver.root_ = new ast::Program($1, $2); }
         ;
 
 c_definitions : CPREPROC c_definitions { $$ = $1 + "\n" + $2; }
-              | STRUCT c_definitions   { $$ = $1 + "\n" + $2; }
+              | STRUCT c_definitions   { $$ = $1 + ";\n" + $2; }
               |                        { $$ = std::string(); }
               ;
 

tests/parser.cpp

@@ -645,7 +645,7 @@ TEST(Parser, field_access_builtin)
 TEST(Parser, cstruct)
 {
   test("struct Foo { int x, y; char *str; } kprobe:sys_read { 1; }",
-      "struct Foo { int x, y; char *str; }\n"
+      "struct Foo { int x, y; char *str; };\n"
       "\n"
       "Program\n"
       " kprobe:sys_read\n"
@@ -655,7 +655,7 @@ TEST(Parser, cstruct)
 TEST(Parser, cstruct_nested)
 {
   test("struct Foo { struct { int x; } bar; } kprobe:sys_read { 1; }",
-      "struct Foo { struct { int x; } bar; }\n"
+      "struct Foo { struct { int x; } bar; };\n"
       "\n"
       "Program\n"
       " kprobe:sys_read\n"