Enable most warnings in GCC

Utilities/types.h

@@ -10,6 +10,7 @@
 
 #include <cstdint>
 #include <cstddef>
+#include <cstring>
 #include <type_traits>
 #include <utility>
 #include <chrono>
@@ -365,6 +366,9 @@ struct alignas(16) s128
 CHECK_SIZE_ALIGN(u128, 16, 16);
 CHECK_SIZE_ALIGN(s128, 16, 16);
 
+using f32 = float;
+using f64 = double;
+
 union alignas(2) f16
 {
 	u16 _u16;
@@ -375,22 +379,28 @@ union alignas(2) f16
 		_u16 = raw;
 	}
 
-	explicit operator float() const
+	explicit operator f32() const
 	{
 		// See http://stackoverflow.com/a/26779139
 		// The conversion doesn't handle NaN/Inf
 		u32 raw = ((_u16 & 0x8000) << 16) |             // Sign (just moved)
 		          (((_u16 & 0x7c00) + 0x1C000) << 13) | // Exponent ( exp - 15 + 127)
 		          ((_u16 & 0x03FF) << 13);              // Mantissa
-		return (float&)raw;
+
+		union
+		{
+			char data[4];
+			u32 data32;
+			f32 res;
+		};
+
+		data32 = raw;
+		return res;
 	}
 };
 
 CHECK_SIZE_ALIGN(f16, 2, 2);
 
-using f32 = float;
-using f64 = double;
-
 template <typename T, typename = std::enable_if_t<std::is_integral<T>::value>>
 constexpr T align(const T& value, ullong align)
 {
@@ -400,12 +410,21 @@ constexpr T align(const T& value, ullong align)
 template <typename T, typename T2>
 inline u32 offset32(T T2::*const mptr)
 {
+	union
+	{
+		char data[sizeof(std::size_t)];
+		std::size_t data_;
+		u32 data32;
+	};
+
 #ifdef _MSC_VER
 	static_assert(sizeof(mptr) == sizeof(u32), "Invalid pointer-to-member size");
-	return reinterpret_cast<const u32&>(mptr);
+	std::memcpy(data, &mptr, sizeof(u32));
+	return data32;
 #elif __GNUG__
 	static_assert(sizeof(mptr) == sizeof(std::size_t), "Invalid pointer-to-member size");
-	return static_cast<u32>(reinterpret_cast<const std::size_t&>(mptr));
+	std::memcpy(data, &mptr, sizeof(std::size_t));
+	return data_;
 #else
 	static_assert(sizeof(mptr) == 0, "Invalid pointer-to-member size");
 #endif

rpcs3/Emu/Cell/Common.h

@@ -12,5 +12,13 @@ enum FPSCR_RN
 // Get the exponent of a float
 inline int fexpf(float x)
 {
-	return ((u32&)x >> 23) & 0xFF;
+	union
+	{
+		char data[4];
+		u32 data32;
+		float arg;
+	};
+
+	arg = x;
+	return (data32 >> 23) & 0xFF;
 }

rpcs3/Emu/Cell/PPUInterpreter.cpp

@@ -3,6 +3,7 @@
 #include "PPUThread.h"
 #include "PPUInterpreter.h"
 #include "Utilities/asm.h"
+#include "Emu/Cell/Common.h"
 
 #include <cmath>
 

rpcs3/Emu/Cell/PPUThread.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "Common.h"
 #include "../CPU/CPUThread.h"
 #include "../Memory/vm.h"
 #include "Utilities/lockless.h"

rpcs3/Emu/Cell/SPUInterpreter.cpp

@@ -6,6 +6,7 @@
 #include "Utilities/asm.h"
 #include "SPUThread.h"
 #include "SPUInterpreter.h"
+#include "Emu/Cell/Common.h"
 
 #include <cmath>
 #include <cfenv>

rpcs3/Emu/Cell/SPUThread.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "Emu/Cell/Common.h"
 #include "Emu/CPU/CPUThread.h"
 #include "Emu/Cell/SPUInterpreter.h"
 #include "Emu/Memory/vm.h"

rpcs3/cmake_modules/ConfigureCompiler.cmake

@@ -9,7 +9,9 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 	# Set compiler options here
 
 	# Warnings
+	add_compile_options(-Wall)
 	add_compile_options(-Wno-attributes -Wno-enum-compare -Wno-invalid-offsetof)
+	add_compile_options(-Wno-unknown-pragmas -Wno-unused-variable -Wno-reorder -Wno-comment)
 
 elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
 	# Clang 5.0 or latter is required
@@ -20,6 +22,7 @@ elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
 	# Set compiler options here
 
 	add_compile_options(-ftemplate-depth=1024)
+	add_compile_options(-Wunused-value -Wunused-comparison)
 	if(APPLE)
 		add_compile_options(-stdlib=libc++)
 	endif()