CMakeLists: Specify -Wextra on linux builds

Allows reporting more cases where logic errors may exist, such as
implicit fallthrough cases, etc.

We currently ignore unused parameters, since we currently have many
cases where this is intentional (virtual interfaces).

While we're at it, we can also tidy up any existing code that causes
warnings. This also uncovered a few bugs as well.

6 files changed, 27 insertions, 23 deletions

diff --git a/src/core/hle/kernel/hle_ipc.cpp b/src/core/hle/kernel/hle_ipc.cpp
index c558a2f33..d65dae3ae 100644
--- a/src/core/hle/kernel/hle_ipc.cpp
+++ b/src/core/hle/kernel/hle_ipc.cpp
@@ -284,17 +284,17 @@ ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(Thread& thread) {
 
 std::vector<u8> HLERequestContext::ReadBuffer(int buffer_index) const {
     std::vector<u8> buffer;
-    const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
+    const bool is_buffer_a{BufferDescriptorA().size() > std::size_t(buffer_index) &&
                            BufferDescriptorA()[buffer_index].Size()};
     auto& memory = Core::System::GetInstance().Memory();
 
     if (is_buffer_a) {
-        ASSERT_MSG(BufferDescriptorA().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorA().size() > std::size_t(buffer_index),
                    "BufferDescriptorA invalid buffer_index {}", buffer_index);
         buffer.resize(BufferDescriptorA()[buffer_index].Size());
         memory.ReadBlock(BufferDescriptorA()[buffer_index].Address(), buffer.data(), buffer.size());
     } else {
-        ASSERT_MSG(BufferDescriptorX().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorX().size() > std::size_t(buffer_index),
                    "BufferDescriptorX invalid buffer_index {}", buffer_index);
         buffer.resize(BufferDescriptorX()[buffer_index].Size());
         memory.ReadBlock(BufferDescriptorX()[buffer_index].Address(), buffer.data(), buffer.size());
@@ -310,7 +310,7 @@ std::size_t HLERequestContext::WriteBuffer(const void* buffer, std::size_t size,
         return 0;
     }
 
-    const bool is_buffer_b{BufferDescriptorB().size() > buffer_index &&
+    const bool is_buffer_b{BufferDescriptorB().size() > std::size_t(buffer_index) &&
                            BufferDescriptorB()[buffer_index].Size()};
     const std::size_t buffer_size{GetWriteBufferSize(buffer_index)};
     if (size > buffer_size) {
@@ -321,13 +321,13 @@ std::size_t HLERequestContext::WriteBuffer(const void* buffer, std::size_t size,
 
     auto& memory = Core::System::GetInstance().Memory();
     if (is_buffer_b) {
-        ASSERT_MSG(BufferDescriptorB().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorB().size() > std::size_t(buffer_index),
                    "BufferDescriptorB invalid buffer_index {}", buffer_index);
         ASSERT_MSG(BufferDescriptorB()[buffer_index].Size() >= size,
                    "BufferDescriptorB buffer_index {} is not large enough", buffer_index);
         memory.WriteBlock(BufferDescriptorB()[buffer_index].Address(), buffer, size);
     } else {
-        ASSERT_MSG(BufferDescriptorC().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorC().size() > std::size_t(buffer_index),
                    "BufferDescriptorC invalid buffer_index {}", buffer_index);
         ASSERT_MSG(BufferDescriptorC()[buffer_index].Size() >= size,
                    "BufferDescriptorC buffer_index {} is not large enough", buffer_index);
@@ -338,16 +338,16 @@ std::size_t HLERequestContext::WriteBuffer(const void* buffer, std::size_t size,
 }
 
 std::size_t HLERequestContext::GetReadBufferSize(int buffer_index) const {
-    const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
+    const bool is_buffer_a{BufferDescriptorA().size() > std::size_t(buffer_index) &&
                            BufferDescriptorA()[buffer_index].Size()};
     if (is_buffer_a) {
-        ASSERT_MSG(BufferDescriptorA().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorA().size() > std::size_t(buffer_index),
                    "BufferDescriptorA invalid buffer_index {}", buffer_index);
         ASSERT_MSG(BufferDescriptorA()[buffer_index].Size() > 0,
                    "BufferDescriptorA buffer_index {} is empty", buffer_index);
         return BufferDescriptorA()[buffer_index].Size();
     } else {
-        ASSERT_MSG(BufferDescriptorX().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorX().size() > std::size_t(buffer_index),
                    "BufferDescriptorX invalid buffer_index {}", buffer_index);
         ASSERT_MSG(BufferDescriptorX()[buffer_index].Size() > 0,
                    "BufferDescriptorX buffer_index {} is empty", buffer_index);
@@ -356,14 +356,14 @@ std::size_t HLERequestContext::GetReadBufferSize(int buffer_index) const {
 }
 
 std::size_t HLERequestContext::GetWriteBufferSize(int buffer_index) const {
-    const bool is_buffer_b{BufferDescriptorB().size() > buffer_index &&
+    const bool is_buffer_b{BufferDescriptorB().size() > std::size_t(buffer_index) &&
                            BufferDescriptorB()[buffer_index].Size()};
     if (is_buffer_b) {
-        ASSERT_MSG(BufferDescriptorB().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorB().size() > std::size_t(buffer_index),
                    "BufferDescriptorB invalid buffer_index {}", buffer_index);
         return BufferDescriptorB()[buffer_index].Size();
     } else {
-        ASSERT_MSG(BufferDescriptorC().size() > buffer_index,
+        ASSERT_MSG(BufferDescriptorC().size() > std::size_t(buffer_index),
                    "BufferDescriptorC invalid buffer_index {}", buffer_index);
         return BufferDescriptorC()[buffer_index].Size();
     }
diff --git a/src/core/hle/service/audio/audren_u.cpp b/src/core/hle/service/audio/audren_u.cpp
index 82a5dbf14..175cabf45 100644
--- a/src/core/hle/service/audio/audren_u.cpp
+++ b/src/core/hle/service/audio/audren_u.cpp
@@ -129,7 +129,7 @@ private:
         LOG_DEBUG(Service_Audio, "called. rendering_time_limit_percent={}",
                   rendering_time_limit_percent);
 
-        ASSERT(rendering_time_limit_percent >= 0 && rendering_time_limit_percent <= 100);
+        ASSERT(rendering_time_limit_percent <= 100);
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
diff --git a/src/core/hle/service/filesystem/filesystem.cpp b/src/core/hle/service/filesystem/filesystem.cpp
index 102017d73..cadc03805 100644
--- a/src/core/hle/service/filesystem/filesystem.cpp
+++ b/src/core/hle/service/filesystem/filesystem.cpp
@@ -451,7 +451,8 @@ FileSys::SaveDataSize FileSystemController::ReadSaveDataSize(FileSys::SaveDataTy
 
         if (res != Loader::ResultStatus::Success) {
             FileSys::PatchManager pm{system.CurrentProcess()->GetTitleID()};
-            auto [nacp_unique, discard] = pm.GetControlMetadata();
+            const auto metadata = pm.GetControlMetadata();
+            const auto& nacp_unique = metadata.first;
 
             if (nacp_unique != nullptr) {
                 new_size = {nacp_unique->GetDefaultNormalSaveSize(),
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp_srv.cpp
index e6811d5b5..61045c75c 100644
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp_srv.cpp
@@ -575,6 +575,7 @@ private:
                                 0,
                                 user_id->GetSize(),
                                 {},
+                                {},
                             });
 
                             continue;
@@ -595,6 +596,7 @@ private:
                                 stoull_be(title_id->GetName()),
                                 title_id->GetSize(),
                                 {},
+                                {},
                             });
                         }
                     }
@@ -619,6 +621,7 @@ private:
                                 stoull_be(title_id->GetName()),
                                 title_id->GetSize(),
                                 {},
+                                {},
                             });
                         }
                     }
diff --git a/src/core/hle/service/time/time_zone_manager.cpp b/src/core/hle/service/time/time_zone_manager.cpp
index 07b553a43..c8159bcd5 100644
--- a/src/core/hle/service/time/time_zone_manager.cpp
+++ b/src/core/hle/service/time/time_zone_manager.cpp
@@ -309,7 +309,7 @@ static bool ParsePosixName(const char* name, TimeZoneRule& rule) {
         offset = GetTZName(name, offset);
         std_len = offset;
     }
-    if (!std_len) {
+    if (std_len == 0) {
         return {};
     }
     if (!GetOffset(name, offset, std_offset)) {
@@ -320,7 +320,7 @@ static bool ParsePosixName(const char* name, TimeZoneRule& rule) {
     int dest_len{};
     int dest_offset{};
     const char* dest_name{name + offset};
-    if (rule.chars.size() < char_count) {
+    if (rule.chars.size() < std::size_t(char_count)) {
         return {};
     }
 
@@ -343,7 +343,7 @@ static bool ParsePosixName(const char* name, TimeZoneRule& rule) {
             return {};
         }
         char_count += dest_len + 1;
-        if (rule.chars.size() < char_count) {
+        if (rule.chars.size() < std::size_t(char_count)) {
             return {};
         }
         if (name[offset] != '\0' && name[offset] != ',' && name[offset] != ';') {
@@ -414,7 +414,7 @@ static bool ParsePosixName(const char* name, TimeZoneRule& rule) {
                 if (is_reversed ||
                     (start_time < end_time &&
                      (end_time - start_time < (year_seconds + (std_offset - dest_offset))))) {
-                    if (rule.ats.size() - 2 < time_count) {
+                    if (rule.ats.size() - 2 < std::size_t(time_count)) {
                         break;
                     }
 
@@ -609,7 +609,7 @@ static bool ParseTimeZoneBinary(TimeZoneRule& time_zone_rule, FileSys::VirtualFi
     }
 
     const u64 position{(read_offset - sizeof(TzifHeader))};
-    const std::size_t bytes_read{vfs_file->GetSize() - sizeof(TzifHeader) - position};
+    const s64 bytes_read = s64(vfs_file->GetSize() - sizeof(TzifHeader) - position);
     if (bytes_read < 0) {
         return {};
     }
@@ -621,11 +621,11 @@ static bool ParseTimeZoneBinary(TimeZoneRule& time_zone_rule, FileSys::VirtualFi
     std::array<char, time_zone_name_max + 1> temp_name{};
     vfs_file->ReadArray(temp_name.data(), bytes_read, read_offset);
     if (bytes_read > 2 && temp_name[0] == '\n' && temp_name[bytes_read - 1] == '\n' &&
-        time_zone_rule.type_count + 2 <= time_zone_rule.ttis.size()) {
+        std::size_t(time_zone_rule.type_count) + 2 <= time_zone_rule.ttis.size()) {
         temp_name[bytes_read - 1] = '\0';
 
         std::array<char, time_zone_name_max> name{};
-        std::memcpy(name.data(), temp_name.data() + 1, bytes_read - 1);
+        std::memcpy(name.data(), temp_name.data() + 1, std::size_t(bytes_read - 1));
 
         TimeZoneRule temp_rule;
         if (ParsePosixName(name.data(), temp_rule)) {
diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index fdc62d05b..7f109f4eb 100644
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -101,8 +101,8 @@ public:
     }
 
     std::u16string ReadInterfaceToken() {
-        u32 unknown = Read<u32_le>();
-        u32 length = Read<u32_le>();
+        [[maybe_unused]] const u32 unknown = Read<u32_le>();
+        const u32 length = Read<u32_le>();
 
         std::u16string token{};