Made FlatBuffers compile correctly with -pedantic

Change-Id: I88b5993219e10e2dfb60ff98d6594d19871988fc
Tested: on Linux

CMakeLists.txt

@@ -52,14 +52,17 @@ set(CMAKE_BUILD_TYPE Debug)
 # source_group(Tests FILES ${FlatBuffers_Tests_SRCS})
 
 if(APPLE)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++ -Wall")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++")
 elseif(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x -Wall")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
 endif()
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror")
+
 if(FLATBUFFERS_CODE_COVERAGE)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fprofile-arcs -ftest-coverage")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
+  set(CMAKE_EXE_LINKER_FLAGS
+      "${CMAKE_EXE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
 endif()
 
 include_directories(include)

include/flatbuffers/flatbuffers.h

@@ -863,14 +863,14 @@ inline int LookupEnum(const char **names, const char *name) {
     struct __declspec(align(alignment))
   #define STRUCT_END(name, size) \
     __pragma(pack()); \
-    static_assert(sizeof(name) == size, "compiler breaks packing rules");
+    static_assert(sizeof(name) == size, "compiler breaks packing rules")
 #elif defined(__GNUC__) || defined(__clang__)
   #define MANUALLY_ALIGNED_STRUCT(alignment) \
-    _Pragma("pack(1)"); \
+    _Pragma("pack(1)") \
     struct __attribute__((aligned(alignment)))
   #define STRUCT_END(name, size) \
-    _Pragma("pack()"); \
-    static_assert(sizeof(name) == size, "compiler breaks packing rules");
+    _Pragma("pack()") \
+    static_assert(sizeof(name) == size, "compiler breaks packing rules")
 #else
   #error Unknown compiler, please define structure alignment macros
 #endif

include/flatbuffers/idl.h

@@ -67,7 +67,10 @@ switch (type) {
         FLATBUFFERS_GEN_TYPES_SCALAR(TD) \
         FLATBUFFERS_GEN_TYPES_POINTER(TD)
 
-// Create an enum for all the types above
+// Create an enum for all the types above.
+#ifdef __GNUC__
+__extension__  // Stop GCC complaining about trailing comma with -Wpendantic.
+#endif
 enum BaseType {
   #define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE) BASE_TYPE_ ## ENUM,
     FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)

samples/monster_generated.h

@@ -11,7 +11,7 @@ namespace Sample {
 enum {
   Color_Red = 0,
   Color_Green = 1,
-  Color_Blue = 2,
+  Color_Blue = 2
 };
 
 inline const char **EnumNamesColor() {
@@ -23,7 +23,7 @@ inline const char *EnumNameColor(int e) { return EnumNamesColor()[e]; }
 
 enum {
   Any_NONE = 0,
-  Any_Monster = 1,
+  Any_Monster = 1
 };
 
 inline const char **EnumNamesAny() {

src/idl_parser.cpp

@@ -82,6 +82,9 @@ template<> inline Offset<void> atot<Offset<void>>(const char *s) {
   TD(Union, 264, "union") \
   TD(NameSpace, 265, "namespace") \
   TD(RootType, 266, "root_type")
+#ifdef __GNUC__
+__extension__  // Stop GCC complaining about trailing comma with -Wpendantic.
+#endif
 enum {
   #define FLATBUFFERS_TOKEN(NAME, VALUE, STRING) kToken ## NAME = VALUE,
     FLATBUFFERS_GEN_TOKENS(FLATBUFFERS_TOKEN)