diff --git a/CMakeLists.txt b/CMakeLists.txt
index b22b0d2a0..f07cdf5af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -244,9 +244,10 @@ if(UNIX)
     # enable C++11 features
     add_definitions(-DLINUX_BUILD)
     add_definitions(-D_GLIBCXX_USE_C99)
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g -Wall -Wno-unused-variable")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -mtune=generic")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -mtune=generic")
+    set(GCC_COMMON_FLAGS "-fvisibility=hidden -mtune=generic -Wall -Werror")
+    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COMMON_FLAGS}")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GCC_COMMON_FLAGS}")
     if(DFHACK_BUILD_64)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64 -mno-avx")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m64 -mno-avx")
diff --git a/depends/protobuf/CMakeLists.txt b/depends/protobuf/CMakeLists.txt
index 619aba524..b12230b71 100644
--- a/depends/protobuf/CMakeLists.txt
+++ b/depends/protobuf/CMakeLists.txt
@@ -145,8 +145,8 @@ set(LIBPROTOC_SRCS
 list(APPEND LIBPROTOBUF_FULL_SRCS ${LIBPROTOBUF_LITE_SRCS})
 
 if(CMAKE_COMPILER_IS_GNUCC)
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -Wno-sign-compare")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-result -Wno-unused-local-typedefs -Wno-misleading-indentation -Wno-class-memaccess")
+    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-result -Wno-unused-local-typedefs -Wno-misleading-indentation -Wno-class-memaccess -Wno-sign-compare")
 elseif(MSVC)
     # Disable warnings for integer conversion to smaller type
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4267")
diff --git a/library/Console-posix.cpp b/library/Console-posix.cpp
index 3c8645ebf..49f54c5ef 100644
--- a/library/Console-posix.cpp
+++ b/library/Console-posix.cpp
@@ -534,7 +534,6 @@ namespace DFHack
             while(1)
             {
                 unsigned char c;
-                int isok;
                 unsigned char seq[2], seq2;
                 lock->unlock();
                 if(!read_char(c))
diff --git a/library/Hooks-darwin.cpp b/library/Hooks-darwin.cpp
index 22e7cc2e9..723d97970 100644
--- a/library/Hooks-darwin.cpp
+++ b/library/Hooks-darwin.cpp
@@ -314,8 +314,6 @@ DFhackCExport int DFH_SDL_Init(uint32_t flags)
     // prevent any subprocesses from trying to load libdfhack.dylib
     setenv("DYLD_INSERT_LIBRARIES", "", 1);
 
-    DFHack::Core & c = DFHack::Core::getInstance();
-
     int ret = SDL_Init(flags);
     return ret;
 }
diff --git a/library/Hooks-linux.cpp b/library/Hooks-linux.cpp
index 8291bf899..cb8ba20db 100644
--- a/library/Hooks-linux.cpp
+++ b/library/Hooks-linux.cpp
@@ -139,10 +139,7 @@ DFhackCExport int SDL_Init(uint32_t flags)
         fprintf(stderr,"dfhack: something went horribly wrong\n");
         exit(1);
     }
-    /*
-    DFHack::Core & c = DFHack::Core::getInstance();
-    c.Init();
-    */
+
     int ret = _SDL_Init(flags);
     return ret;
 }
diff --git a/library/Process-darwin.cpp b/library/Process-darwin.cpp
index 4e1abc108..70598e18f 100644
--- a/library/Process-darwin.cpp
+++ b/library/Process-darwin.cpp
@@ -50,8 +50,6 @@ using namespace DFHack;
 
 Process::Process(const VersionInfoFactory& known_versions) : identified(false), my_pe(0)
 {
-    int target_result;
-
     char path[1024];
     char *real_path;
     uint32_t size = sizeof(path);
diff --git a/library/Process-linux.cpp b/library/Process-linux.cpp
index be3ebb5df..e50750015 100644
--- a/library/Process-linux.cpp
+++ b/library/Process-linux.cpp
@@ -48,11 +48,7 @@ using namespace DFHack;
 
 Process::Process(const VersionInfoFactory& known_versions) : identified(false), my_pe(0)
 {
-    const char * dir_name = "/proc/self/";
     const char * exe_link_name = "/proc/self/exe";
-    const char * cwd_name = "/proc/self/cwd";
-    const char * cmdline_name = "/proc/self/cmdline";
-    int target_result;
 
     // valgrind replaces readlink for /proc/self/exe, but not open.
     char self_exe[1024];
diff --git a/library/RemoteClient.cpp b/library/RemoteClient.cpp
index 7735df028..6a8becaae 100644
--- a/library/RemoteClient.cpp
+++ b/library/RemoteClient.cpp
@@ -358,7 +358,7 @@ bool sendRemoteMessage(CSimpleSocket *socket, int16_t id, const MessageLite *msg
 
     uint8_t *pstart = data + sizeof(RPCMessageHeader);
     uint8_t *pend = msg->SerializeWithCachedSizesToArray(pstart);
-    assert((pend - pstart) == size);
+    assert((pend - pstart) == size); (void)pend;
 
     int got = socket->Send(data, fullsz);
     delete[] data;
diff --git a/library/modules/Buildings.cpp b/library/modules/Buildings.cpp
index 3d0d5a563..1d6681ee8 100644
--- a/library/modules/Buildings.cpp
+++ b/library/modules/Buildings.cpp
@@ -173,7 +173,6 @@ uint32_t Buildings::getNumBuildings()
 
 bool Buildings::Read (const uint32_t index, t_building & building)
 {
-    Core & c = Core::getInstance();
     df::building *bld = world->buildings.all[index];
 
     building.x1 = bld->x1;
@@ -193,12 +192,10 @@ bool Buildings::Read (const uint32_t index, t_building & building)
 bool Buildings::ReadCustomWorkshopTypes(map <uint32_t, string> & btypes)
 {
     vector <building_def *> & bld_def = world->raws.buildings.all;
-    uint32_t size = bld_def.size();
     btypes.clear();
 
-    for (auto iter = bld_def.begin(); iter != bld_def.end();iter++)
+    for (building_def *temp : bld_def)
     {
-        building_def * temp = *iter;
         btypes[temp->id] = temp->code;
     }
     return true;
diff --git a/library/modules/Gui.cpp b/library/modules/Gui.cpp
index 6db89df64..963b2ecd6 100644
--- a/library/modules/Gui.cpp
+++ b/library/modules/Gui.cpp
@@ -261,7 +261,7 @@ DEFINE_GET_FOCUS_STRING_HANDLER(dwarfmode)
     case ViewUnits:
         if (ui_selected_unit)
         {
-            if (auto unit = vector_get(world->units.active, *ui_selected_unit))
+            if (vector_get(world->units.active, *ui_selected_unit))
             {
                 focus += "/Some";
 
diff --git a/library/modules/Job.cpp b/library/modules/Job.cpp
index 4feb33bad..44808a9c5 100644
--- a/library/modules/Job.cpp
+++ b/library/modules/Job.cpp
@@ -383,7 +383,7 @@ bool DFHack::Job::removeJob(df::job *job) {
         //a great way of recovering since we can't properly destroy the job & we can't leave it
         //around.  Better to know the moment that becomes a problem.
         bool success = disconnectJobGeneralRef(job, ref);
-        assert(success);
+        assert(success); (void)success;
 
         vector_erase_at(job->general_refs, 0);
         if (ref != NULL) delete ref;
diff --git a/plugins/autochop.cpp b/plugins/autochop.cpp
index 8f2225f72..d28cf59b3 100644
--- a/plugins/autochop.cpp
+++ b/plugins/autochop.cpp
@@ -470,7 +470,6 @@ public:
     {
         selected_column = 0;
 
-        auto last_selected_index = burrows_column.highlighted_index;
         burrows_column.clear();
 
         for (df::burrow *burrow : ui->burrows.list)
@@ -825,7 +824,6 @@ struct autochop_hook : public df::viewscreen_dwarfmodest
         if (dims.menu_x1 <= 0)
             return;
 
-        df::ui_sidebar_mode d = ui->main.mode;
         if (!isInDesignationMenu())
             return;
 
diff --git a/plugins/autodump.cpp b/plugins/autodump.cpp
index 97d266333..054d28f77 100644
--- a/plugins/autodump.cpp
+++ b/plugins/autodump.cpp
@@ -350,7 +350,6 @@ static command_result autodump_main(color_ostream &out, vector <string> & parame
     size_t numItems = world->items.all.size();
 
     MapCache MC;
-    int i = 0;
     int dumped_total = 0;
 
     int cx, cy, cz;
diff --git a/plugins/autohauler.cpp b/plugins/autohauler.cpp
index dffce56d7..35bf90ca1 100644
--- a/plugins/autohauler.cpp
+++ b/plugins/autohauler.cpp
@@ -809,10 +809,6 @@ DFhackCExport command_result plugin_onupdate ( color_ostream &out )
     // Reset step count since at this point it has reached 60
     step_count = 0;
 
-    // xxx I don't know what this does
-    uint32_t race = ui->race_id;
-    uint32_t civ = ui->civ_id;
-
     // Create a vector of units. This will be populated in the following for loop.
     std::vector<df::unit *> dwarfs;
 
diff --git a/plugins/autolabor.cpp b/plugins/autolabor.cpp
index 0fb46a3b6..d6921f1ac 100644
--- a/plugins/autolabor.cpp
+++ b/plugins/autolabor.cpp
@@ -794,8 +794,6 @@ static void assign_labor(unit_labor::unit_labor labor,
         if (labor_infos[labor].mode() != AUTOMATIC)
             return;
 
-        int best_dwarf = 0;
-        int best_value = -10000;
         int best_skill = 0;
 
         std::vector<int> values(n_dwarfs);
@@ -804,8 +802,6 @@ static void assign_labor(unit_labor::unit_labor labor,
         std::map<int, int> dwarf_skillxp;
         std::vector<bool> previously_enabled(n_dwarfs);
 
-        auto mode = labor_infos[labor].mode();
-
         // Find candidate dwarfs, and calculate a preference value for each dwarf
         for (int dwarf = 0; dwarf < n_dwarfs; dwarf++)
         {
@@ -1039,9 +1035,6 @@ DFhackCExport command_result plugin_onupdate ( color_ostream &out )
         return CR_OK;
     step_count = 0;
 
-    uint32_t race = ui->race_id;
-    uint32_t civ = ui->civ_id;
-
     std::vector<df::unit *> dwarfs;
 
     bool has_butchers = false;
@@ -1163,7 +1156,6 @@ DFhackCExport command_result plugin_onupdate ( color_ostream &out )
             df::job_skill_class skill_class = ENUM_ATTR(job_skill, type, skill);
 
             int skill_level = (*s)->rating;
-            int skill_experience = (*s)->experience;
 
             // Track total & highest skill among normal/medical skills. (We don't care about personal or social skills.)
 
diff --git a/plugins/automaterial.cpp b/plugins/automaterial.cpp
index 7940fbdb9..8fc1cf1f2 100644
--- a/plugins/automaterial.cpp
+++ b/plugins/automaterial.cpp
@@ -103,7 +103,6 @@ static map< int16_t, vector<MaterialDescriptor> > preferred_materials;
 static map< int16_t, df::interface_key > hotkeys;
 static bool last_used_moved = false;
 static bool auto_choose_materials = true;
-static bool auto_choose_attempted = true;
 static bool revert_to_last_used_type = false;
 static bool allow_future_placement = false;
 
diff --git a/plugins/building-hacks.cpp b/plugins/building-hacks.cpp
index 17390cd5a..2c75d4622 100644
--- a/plugins/building-hacks.cpp
+++ b/plugins/building-hacks.cpp
@@ -141,7 +141,7 @@ struct work_hook : df::building_workshopst{
 
     DEFINE_VMETHOD_INTERPOSE(void, getPowerInfo, (df::power_info *info))
     {
-        if (auto def = find_def())
+        if (find_def())
         {
             df::power_info power;
             get_current_power(info);
@@ -420,7 +420,7 @@ static int addBuilding(lua_State* L)
 static void setPower(df::building_workshopst* workshop, int power_produced, int power_consumed)
 {
     work_hook* ptr = static_cast<work_hook*>(workshop);
-    if (workshop_hack_data* def = ptr->find_def())//check if it's really hacked workshop
+    if (ptr->find_def()) // check if it's really hacked workshop
     {
         ptr->set_current_power(power_produced, power_consumed);
     }
@@ -431,7 +431,7 @@ static int getPower(lua_State*L)
     work_hook* ptr = static_cast<work_hook*>(workshop);
     if (!ptr)
         return 0;
-    if (workshop_hack_data* def = ptr->find_def())//check if it's really hacked workshop
+    if (ptr->find_def()) // check if it's really hacked workshop
     {
         df::power_info info;
         ptr->get_current_power(&info);
diff --git a/plugins/buildingplan.cpp b/plugins/buildingplan.cpp
index 316d0e1ca..d0eeb28d8 100644
--- a/plugins/buildingplan.cpp
+++ b/plugins/buildingplan.cpp
@@ -105,7 +105,6 @@ private:
 
         for (size_t i = 0; i < raws.inorganics.size(); i++)
         {
-            df::inorganic_raw *p = raws.inorganics[i];
             MaterialInfo material;
             material.decode(0, i);
             addMaterialEntry(selected_category, material, material.toString());
@@ -120,7 +119,6 @@ private:
                 df::plant_raw *p = raws.plants.all[i];
                 for (size_t j = 0; p->material.size() > 1 && j < p->material.size(); j++)
                 {
-                    auto t = p->material[j];
                     if (p->material[j]->id != "WOOD")
                         continue;
 
diff --git a/plugins/changelayer.cpp b/plugins/changelayer.cpp
index 5c252b102..79081c040 100644
--- a/plugins/changelayer.cpp
+++ b/plugins/changelayer.cpp
@@ -182,11 +182,6 @@ command_result changelayer (color_ostream &out, std::vector <std::string> & para
     }
     DFCoord cursor (cursorX,cursorY,cursorZ);
 
-    uint32_t blockX = cursorX / 16;
-    uint32_t tileX = cursorX % 16;
-    uint32_t blockY = cursorY / 16;
-    uint32_t tileY = cursorY % 16;
-
     MapExtras::Block * b = mc.BlockAt(cursor/16);
     if(!b || !b->is_valid())
     {
diff --git a/plugins/createitem.cpp b/plugins/createitem.cpp
index ad80cff64..ffc2e1ca8 100644
--- a/plugins/createitem.cpp
+++ b/plugins/createitem.cpp
@@ -353,8 +353,8 @@ command_result df_createitem (color_ostream &out, vector <string> & parameters)
                 for (size_t j = 0; j < creature->caste.size(); j++)
                 {
                     df::caste_raw *caste = creature->caste[j];
-                    castes += " " + creature->caste[j]->caste_id;
-                    if (creature->caste[j]->caste_id == tokens[1])
+                    castes += " " + caste->caste_id;
+                    if (caste->caste_id == tokens[1])
                     {
                         mat_type = i;
                         mat_index = j;
diff --git a/plugins/debug.cpp b/plugins/debug.cpp
index a842de430..ee35bcdf6 100644
--- a/plugins/debug.cpp
+++ b/plugins/debug.cpp
@@ -604,7 +604,8 @@ static command_result parseRegexParam(std::regex& target,
 template<typename Callable1, typename Callable2, typename Callable3>
 static command_result applyCategoryFilters(color_ostream& out,
         std::vector<std::string>& parameters,
-        size_t pos, Callable1 header,
+        size_t pos,
+        Callable1 header,
         Callable2 categoryMatch,
         Callable3 listComplete)
 {
@@ -626,7 +627,7 @@ static command_result applyCategoryFilters(color_ostream& out,
     auto& manager = DebugManager::getInstance();
     std::lock_guard<std::mutex> lock(manager.access_mutex_);
     out << std::left;
-    auto guard = header(manager, categoryRegex, pluginRegex);
+    auto VARIABLE_IS_NOT_USED guard = header(manager, categoryRegex, pluginRegex);
     for (auto* category: manager) {
         DebugCategory::cstring_ref p = category->plugin();
         DebugCategory::cstring_ref c = category->category();
diff --git a/plugins/deramp.cpp b/plugins/deramp.cpp
index 97a3dc184..62679cae0 100644
--- a/plugins/deramp.cpp
+++ b/plugins/deramp.cpp
@@ -73,7 +73,7 @@ command_result df_deramp (color_ostream &out, vector <string> & parameters)
         Job::removeJob(job);
     }
 
-    int num_blocks = 0, blocks_total = world->map.map_blocks.size();
+    int blocks_total = world->map.map_blocks.size();
     for (int i = 0; i < blocks_total; i++)
     {
         df::map_block *block = world->map.map_blocks[i];
diff --git a/plugins/devel/check-structures-sanity/dispatch.cpp b/plugins/devel/check-structures-sanity/dispatch.cpp
index d93833513..05dcc0377 100644
--- a/plugins/devel/check-structures-sanity/dispatch.cpp
+++ b/plugins/devel/check-structures-sanity/dispatch.cpp
@@ -299,13 +299,13 @@ void Checker::dispatch_primitive(const QueueItem & item, const CheckedStructure
             FAIL("invalid value for bool: " << int(val));
         }
     }
-    else if (auto int_id = dynamic_cast<df::integer_identity_base *>(cs.identity))
+    else if (dynamic_cast<df::integer_identity_base *>(cs.identity))
     {
         check_possible_pointer(item, cs);
 
         // TODO check ints?
     }
-    else if (auto float_id = dynamic_cast<df::float_identity_base *>(cs.identity))
+    else if (dynamic_cast<df::float_identity_base *>(cs.identity))
     {
         // TODO check floats?
     }
@@ -876,6 +876,7 @@ void Checker::check_stl_string(const QueueItem & item)
     ptrdiff_t capacity = (string->ptr - 1)->capacity;
 #endif
 
+    (void)start;
     if (length < 0)
     {
         FAIL("string length is negative (" << length << ")");
diff --git a/plugins/devel/dumpmats.cpp b/plugins/devel/dumpmats.cpp
index 42c97e8e6..6cb7ccac1 100644
--- a/plugins/devel/dumpmats.cpp
+++ b/plugins/devel/dumpmats.cpp
@@ -38,11 +38,7 @@ command_result df_dumpmats (color_ostream &out, vector<string> &parameters)
         out.print("\n[MATERIAL:%s] - reconstructed from data extracted from memory\n", mat->id.c_str());
 
         int32_t def_color[6] = {-1,-1,-1,-1,-1,-1};
-        bool name_all = false;
-        bool name_all_solid = false;
         string def_name[6];
-        bool adj_all = false;
-        bool adj_all_solid = false;
         string def_adj[6];
 
         int32_t solid_color = mat->state_color[matter_state::Solid];
diff --git a/plugins/devel/kittens.cpp b/plugins/devel/kittens.cpp
index b978fab7f..fce924aff 100644
--- a/plugins/devel/kittens.cpp
+++ b/plugins/devel/kittens.cpp
@@ -253,7 +253,7 @@ struct Connected : public ClearMem<Connected> {
         con[pos] = b->signal.connect(
                 [this](uint32_t) {
                     uint32_t old = callee.fetch_add(1);
-                    assert(old != 0xDEDEDEDE);
+                    assert(old != 0xDEDEDEDE); (void)old;
                     std::this_thread::sleep_for(delay);
                     assert(callee != 0xDEDEDEDE);
                 });
@@ -263,7 +263,7 @@ struct Connected : public ClearMem<Connected> {
         b->con[pos] = signal.connect(b,
                 [bptr](int) {
                     uint32_t old = bptr->callee.fetch_add(1);
-                    assert(old != 0xDEDEDEDE);
+                    assert(old != 0xDEDEDEDE); (void)old;
                     std::this_thread::sleep_for(delay);
                     assert(bptr->callee != 0xDEDEDEDE);
                 });
@@ -280,7 +280,7 @@ struct Connected : public ClearMem<Connected> {
         con[pos] = sig->connect(b,
                 [this](uint32_t) {
                     uint32_t old = callee.fetch_add(1);
-                    assert(old != 0xDEDEDEDE);
+                    assert(old != 0xDEDEDEDE); (void)old;
                     std::this_thread::sleep_for(delay);
                     assert(callee != 0xDEDEDEDE);
                 });
@@ -292,7 +292,7 @@ struct Connected : public ClearMem<Connected> {
         con[pos] = b->signal.connect(a,
                 [this](uint32_t) {
                     uint32_t old = callee.fetch_add(1);
-                    assert(old != 0xDEDEDEDE);
+                    assert(old != 0xDEDEDEDE); (void)old;
                     std::this_thread::sleep_for(delay);
                     assert(callee != 0xDEDEDEDE);
                 });
@@ -419,7 +419,7 @@ command_result kittens (color_ostream &out, vector <string> & parameters)
         "NYAN NYAN NYAN NYAN NYAN NYAN NYAN",
         0
     };
-    const char * kittenz1 []=
+    const char VARIABLE_IS_NOT_USED * kittenz1 []=
     {
         "   ____",
         "  (.   \\",
diff --git a/plugins/devel/stockcheck.cpp b/plugins/devel/stockcheck.cpp
index bc4bea52f..b29cb53f0 100644
--- a/plugins/devel/stockcheck.cpp
+++ b/plugins/devel/stockcheck.cpp
@@ -76,9 +76,7 @@ public:
                 {
                     size++;
                     DFCoord cursor (x,y,z);
-                    uint32_t blockX = x / 16;
                     uint32_t tileX = x % 16;
-                    uint32_t blockY = y / 16;
                     uint32_t tileY = y % 16;
                     MapExtras::Block * b = mc.BlockAt(cursor/16);
                     if(b && b->is_valid())
diff --git a/plugins/devel/vectors.cpp b/plugins/devel/vectors.cpp
index 0052fcede..28183874d 100644
--- a/plugins/devel/vectors.cpp
+++ b/plugins/devel/vectors.cpp
@@ -217,8 +217,6 @@ command_result df_vectors (color_ostream &con, vector <string> & parameters)
         return CR_FAILURE;
     }
 
-    uintptr_t pos = start;
-
     const size_t ptr_size = sizeof(void*);
 
     for (uintptr_t pos = start; pos < end; pos += ptr_size)
diff --git a/plugins/dig.cpp b/plugins/dig.cpp
index 83ca2ef2d..7f3d66362 100644
--- a/plugins/dig.cpp
+++ b/plugins/dig.cpp
@@ -1282,7 +1282,6 @@ command_result digl (color_ostream &out, vector <string> & parameters)
     stack <DFHack::DFCoord> flood;
     flood.push(xy);
 
-    int i = 0;
     while( !flood.empty() )
     {
         DFHack::DFCoord current = flood.top();
diff --git a/plugins/diggingInvaders/assignJob.cpp b/plugins/diggingInvaders/assignJob.cpp
index 7e3dfaf8c..2eaad9eb5 100644
--- a/plugins/diggingInvaders/assignJob.cpp
+++ b/plugins/diggingInvaders/assignJob.cpp
@@ -68,11 +68,6 @@ int32_t assignJob(color_ostream& out, Edge firstImportantEdge, unordered_map<df:
     }
     //out.print("first important edge: (%d,%d,%d) -> (%d,%d,%d)\n", pt1.x,pt1.y,pt1.z, pt2.x,pt2.y,pt2.z);
 
-    df::map_block* block1 = Maps::getTileBlock(pt1);
-    df::map_block* block2 = Maps::getTileBlock(pt2);
-    bool passable1 = block1->walkable[pt1.x&0xF][pt1.y&0xF];
-    bool passable2 = block2->walkable[pt2.x&0xF][pt2.y&0xF];
-
     df::coord location;
     df::building* building = Buildings::findAtTile(pt2);
     df::coord buildingPos = pt2;
diff --git a/plugins/diggingInvaders/diggingInvaders.cpp b/plugins/diggingInvaders/diggingInvaders.cpp
index 4afcae6f8..09d045090 100644
--- a/plugins/diggingInvaders/diggingInvaders.cpp
+++ b/plugins/diggingInvaders/diggingInvaders.cpp
@@ -472,7 +472,7 @@ void findAndAssignInvasionJob(color_ostream& out, void* tickTime) {
     yMax *= 16;
     MapExtras::MapCache cache;
 
-    clock_t t0 = clock();
+    // clock_t t0 = clock();
     clock_t totalEdgeTime = 0;
     int32_t edgesExpanded = 0;
     while(!fringe.empty()) {
@@ -529,7 +529,7 @@ void findAndAssignInvasionJob(color_ostream& out, void* tickTime) {
         }
         delete myEdges;
     }
-    clock_t time = clock() - t0;
+    // clock_t time = clock() - t0;
     //out.print("tickTime = %d, time = %d, totalEdgeTime = %d, total points = %d, total edges = %d, time per point = %.3f, time per edge = %.3f, clocks/sec = %d\n", (int32_t)tickTime, time, totalEdgeTime, closedSet.size(), edgeCount, (float)time / closedSet.size(), (float)time / edgeCount, CLOCKS_PER_SEC);
     fringe.clear();
 
diff --git a/plugins/embark-assistant/finder_ui.cpp b/plugins/embark-assistant/finder_ui.cpp
index aaaf8945e..1fb845d15 100644
--- a/plugins/embark-assistant/finder_ui.cpp
+++ b/plugins/embark-assistant/finder_ui.cpp
@@ -1333,19 +1333,17 @@ namespace embark_assist {
             //  off to compensate for the list starting with 1 at index 0.
             //
             auto screen = Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0);
-            int16_t x = screen->location.region_pos.x;
-            int16_t y = screen->location.region_pos.y;
             state->ui[static_cast<int8_t>(fields::x_dim)]->current_display_value =
-                Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0)->location.embark_pos_max.x -
-                Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0)->location.embark_pos_min.x;
+                screen->location.embark_pos_max.x -
+                screen->location.embark_pos_min.x;
             state->ui[static_cast<int8_t>(fields::x_dim)]->current_index =
                 state->ui[static_cast<int8_t>(fields::x_dim)]->current_display_value;
             state->ui[static_cast<int8_t>(fields::x_dim)]->current_value =
                 state->ui[static_cast<int8_t>(fields::x_dim)]->current_display_value + 1;
 
             state->ui[static_cast<int8_t>(fields::y_dim)]->current_display_value =
-                Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0)->location.embark_pos_max.y -
-                Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0)->location.embark_pos_min.y;
+                screen->location.embark_pos_max.y -
+                screen->location.embark_pos_min.y;
             state->ui[static_cast<int8_t>(fields::y_dim)]->current_index =
                 state->ui[static_cast<int8_t>(fields::y_dim)]->current_display_value;
             state->ui[static_cast<int8_t>(fields::y_dim)]->current_value =
diff --git a/plugins/embark-assistant/matcher.cpp b/plugins/embark-assistant/matcher.cpp
index 237b12d19..c19ad02a6 100644
--- a/plugins/embark-assistant/matcher.cpp
+++ b/plugins/embark-assistant/matcher.cpp
@@ -605,8 +605,6 @@ namespace embark_assist {
             result.mineral_3 = finder->mineral_3 == -1;
             bool failed_match = false;
 
-            const uint16_t embark_size = finder->x_dim * finder->y_dim;
-
             if (finder->biome_count_min != -1 ||
                 finder->biome_count_max != -1 ||
                 finder->biome_1 != -1 ||
diff --git a/plugins/embark-assistant/survey.cpp b/plugins/embark-assistant/survey.cpp
index f0e14378a..57c4a1470 100644
--- a/plugins/embark-assistant/survey.cpp
+++ b/plugins/embark-assistant/survey.cpp
@@ -2068,7 +2068,6 @@ void embark_assist::survey::survey_region_sites(embark_assist::defs::site_lists
     //            color_ostream_proxy out(Core::getInstance().getConsole());
     auto screen = Gui::getViewscreenByType<df::viewscreen_choose_start_sitest>(0);
     df::world_data *world_data = world->world_data;
-    int8_t index = 0;
 
     site_list->clear();
 
diff --git a/plugins/embark-tools.cpp b/plugins/embark-tools.cpp
index da6a2f3b1..b87295020 100644
--- a/plugins/embark-tools.cpp
+++ b/plugins/embark-tools.cpp
@@ -247,7 +247,6 @@ public:
         {
             df::interface_key key = *iter;
             bool is_motion = false;
-            int dx = 0, dy = 0;
             switch (key)
             {
                 case df::interface_key::CURSOR_UP:
@@ -481,7 +480,6 @@ public:
     virtual void after_render(start_sitest* screen)
     {
         GET_EMBARK_POS(screen, x1, x2, y1, y2, width, height);
-        int mouse_x = gps->mouse_x, mouse_y = gps->mouse_y;
         int local_x = prev_x - 1;
         int local_y = prev_y - 2;
         if (local_x >= x1 && local_x <= x2 && local_y >= y1 && local_y <= y2)
diff --git a/plugins/fixveins.cpp b/plugins/fixveins.cpp
index 88eeb3b61..84d475518 100644
--- a/plugins/fixveins.cpp
+++ b/plugins/fixveins.cpp
@@ -56,7 +56,7 @@ command_result df_fixveins (color_ostream &out, vector <string> & parameters)
     int mineral_removed = 0, feature_removed = 0;
     int mineral_added = 0, feature_added = 0;
 
-    int num_blocks = 0, blocks_total = world->map.map_blocks.size();
+    int blocks_total = world->map.map_blocks.size();
     for (int i = 0; i < blocks_total; i++)
     {
         df::map_block *block = world->map.map_blocks[i];
diff --git a/plugins/getplants.cpp b/plugins/getplants.cpp
index 242f56c3f..25823eb17 100644
--- a/plugins/getplants.cpp
+++ b/plugins/getplants.cpp
@@ -526,7 +526,6 @@ command_result df_getplants (color_ostream &out, vector <string> & parameters)
     {
         const df::plant *plant = world->plants.all[i];
         df::map_block *cur = Maps::getTileBlock(plant->pos);
-        bool dirty = false;
 
         int x = plant->pos.x % 16;
         int y = plant->pos.y % 16;
diff --git a/plugins/hotkeys.cpp b/plugins/hotkeys.cpp
index 2728afcf9..e4cd13574 100644
--- a/plugins/hotkeys.cpp
+++ b/plugins/hotkeys.cpp
@@ -72,7 +72,6 @@ static void find_active_keybindings(df::viewscreen *screen)
                     auto list = Core::getInstance().ListKeyBindings(sym);
                     for (auto invoke_cmd = list.begin(); invoke_cmd != list.end(); invoke_cmd++)
                     {
-                        bool add_temp_binding = false;
                         if (invoke_cmd->find(":") == string::npos)
                         {
                             add_binding_if_valid(sym, *invoke_cmd, screen);
@@ -303,7 +302,6 @@ private:
 
 static command_result hotkeys_cmd(color_ostream &out, vector <string> & parameters)
 {
-    bool show_help = false;
     if (parameters.empty())
     {
         if (Maps::IsValid())
diff --git a/plugins/labormanager/joblabormapper.cpp b/plugins/labormanager/joblabormapper.cpp
index 6a97aa75f..d9b8a6306 100644
--- a/plugins/labormanager/joblabormapper.cpp
+++ b/plugins/labormanager/joblabormapper.cpp
@@ -414,7 +414,7 @@ public:
         df::building* bld = get_building_from_job(j);
         df::building_type type = bld->getType();
 
-        switch (bld->getType())
+        switch (type)
         {
         case df::building_type::NONE:
             return df::unit_labor::NONE;
@@ -513,7 +513,7 @@ public:
         }
 
         debug("LABORMANAGER: Cannot deduce labor for destroy building job of type %s\n",
-            ENUM_KEY_STR(building_type, bld->getType()).c_str());
+            ENUM_KEY_STR(building_type, type).c_str());
         debug_pause();
 
         return df::unit_labor::NONE;
diff --git a/plugins/petcapRemover.cpp b/plugins/petcapRemover.cpp
index 7504ab20e..4b1b53a46 100644
--- a/plugins/petcapRemover.cpp
+++ b/plugins/petcapRemover.cpp
@@ -75,10 +75,6 @@ void impregnateMany() {
         }
         if ( unit->flags1.bits.caged )
             continue;
-        int32_t race = unit->race;
-        int16_t caste = unit->caste;
-        df::creature_raw* creatureRaw = world->raws.creatures.all[race];
-        df::caste_raw* casteRaw = creatureRaw->caste[caste];
         //must have PET or PET_EXOTIC
         if ( !Units::isTamable(unit))
             continue;
diff --git a/plugins/prospector.cpp b/plugins/prospector.cpp
index cd15ebe96..7bc8f2388 100644
--- a/plugins/prospector.cpp
+++ b/plugins/prospector.cpp
@@ -650,8 +650,6 @@ command_result prospector (color_ostream &con, vector <string> & parameters)
     matdata aquiferTiles;
     matdata tubeTiles;
 
-    uint32_t vegCount = 0;
-
     for(uint32_t z = 0; z < z_max; z++)
     {
         for(uint32_t b_y = 0; b_y < y_max; b_y++)
diff --git a/plugins/remotefortressreader/dwarf_control.cpp b/plugins/remotefortressreader/dwarf_control.cpp
index 98b51175f..3a5933464 100644
--- a/plugins/remotefortressreader/dwarf_control.cpp
+++ b/plugins/remotefortressreader/dwarf_control.cpp
@@ -72,9 +72,10 @@ void GetBuildingSize(
             rad_x_high = world->building_width / 2;
         else
             rad_x_high = (world->building_width / 2) - 1;
-        bool heightOdd = world->building_width % 2;
+
+        bool heightOdd = world->building_height % 2;
         rad_y_low = world->building_height / 2;
-        if (widthOdd)
+        if (heightOdd)
             rad_y_high = world->building_height / 2;
         else
             rad_y_high = (world->building_height / 2) - 1;
@@ -474,7 +475,6 @@ command_result SetSideMenu(DFHack::color_ostream &stream, const DwarfControl::Si
     default:
         break;
     }
-    auto viewScreen = getCurViewscreen();
     if (in->has_action())
     {
         switch (in->action())
diff --git a/plugins/remotefortressreader/remotefortressreader.cpp b/plugins/remotefortressreader/remotefortressreader.cpp
index a0521e64d..9ab9a7502 100644
--- a/plugins/remotefortressreader/remotefortressreader.cpp
+++ b/plugins/remotefortressreader/remotefortressreader.cpp
@@ -699,7 +699,6 @@ map<DFCoord, uint16_t> spatterHashes;
 bool IsspatterChanged(DFCoord pos)
 {
     df::map_block * block = Maps::getBlock(pos);
-    bool changed = false;
     std::vector<df::block_square_event_material_spatterst *> materials;
 #if DF_VERSION_INT > 34011
     std::vector<df::block_square_event_item_spatterst *> items;
@@ -807,7 +806,7 @@ static command_result GetMaterialList(color_ostream &stream, const EmptyMessage
 
 
     df::world_raws *raws = &world->raws;
-    df::world_history *history = &world->history;
+    // df::world_history *history = &world->history;
     MaterialInfo mat;
     for (size_t i = 0; i < raws->inorganics.size(); i++)
     {
@@ -1080,7 +1079,7 @@ void CopyDesignation(df::map_block * DfBlock, RemoteFortressReader::MapBlock * N
             NetBlock->add_water_stagnant(designation.bits.water_stagnant);
             if (gamemode && (*gamemode == game_mode::ADVENTURE))
             {
-                auto fog_of_war = DfBlock->fog_of_war[xx][yy];
+                // auto fog_of_war = DfBlock->fog_of_war[xx][yy];
                 NetBlock->add_hidden((TileDigDesignation)designation.bits.dig == TileDigDesignation::NO_DIG || designation.bits.hidden);
                 NetBlock->add_tile_dig_designation(TileDigDesignation::NO_DIG);
                 NetBlock->add_tile_dig_designation_marker(false);
@@ -2172,7 +2171,7 @@ static command_result GetWorldMapNew(color_ostream &stream, const EmptyMessage *
         for (int xx = 0; xx < width; xx++)
         {
             df::region_map_entry * map_entry = &data->region_map[xx][yy];
-            df::world_region * region = data->regions[map_entry->region_id];
+            // df::world_region * region = data->regions[map_entry->region_id];
 
             auto regionTile = out->add_region_tiles();
             regionTile->set_elevation(map_entry->elevation);
diff --git a/plugins/rendermax/renderer_light.cpp b/plugins/rendermax/renderer_light.cpp
index d76889220..cc5d569c0 100644
--- a/plugins/rendermax/renderer_light.cpp
+++ b/plugins/rendermax/renderer_light.cpp
@@ -535,7 +535,6 @@ coord2d lightingEngineViewscreen::worldToViewportCoord(const coord2d& in,const r
     return in-window2d+r.first;
 }
 
-static size_t max_list_size = 100000; // Avoid iterating over huge lists
 void lightingEngineViewscreen::doSun(const lightSource& sky,MapExtras::MapCache& map)
 {
     //TODO fix this mess
@@ -673,7 +672,7 @@ void lightingEngineViewscreen::doOcupancyAndLights()
             df::tiletype_shape shape = ENUM_ATTR(tiletype,shape,type);
             bool is_wall=!ENUM_ATTR(tiletype_shape,passable_high,shape);
             bool is_floor=!ENUM_ATTR(tiletype_shape,passable_low,shape);
-            df::tiletype_shape_basic basic_shape = ENUM_ATTR(tiletype_shape, basic_shape, shape);
+            // df::tiletype_shape_basic basic_shape = ENUM_ATTR(tiletype_shape, basic_shape, shape);
             df::tiletype_material tileMat= ENUM_ATTR(tiletype,material,type);
 
             DFHack::t_matpair mat=b->staticMaterialAt(gpos);
diff --git a/plugins/rendermax/renderer_light.hpp b/plugins/rendermax/renderer_light.hpp
index 4e779f3fa..89a2092d5 100644
--- a/plugins/rendermax/renderer_light.hpp
+++ b/plugins/rendermax/renderer_light.hpp
@@ -51,8 +51,6 @@ private:
     rgbf adapt_to_light(const rgbf& light)
     {
         const float influence=0.0001f;
-        const float max_adapt=1;
-        const float min_adapt=0;
         float intensity=(light.r+light.g+light.b)/3.0;
         light_adaptation=intensity*influence+light_adaptation*(1-influence);
         float delta=light_adaptation-intensity;
@@ -77,7 +75,7 @@ private:
         old_opengl* p=reinterpret_cast<old_opengl*>(parent);
         float *fg = p->fg + tile * 4 * 6;
         float *bg = p->bg + tile * 4 * 6;
-        float *tex = p->tex + tile * 2 * 6;
+        // float *tex = p->tex + tile * 2 * 6;
         rgbf light=lightGrid[tile];//for light adaptation: rgbf light=adapt_to_light(lightGrid[tile]);
 
         for (int i = 0; i < 6; i++) { //oh how sse would do wonders here, or shaders...
diff --git a/plugins/rendermax/renderer_opengl.hpp b/plugins/rendermax/renderer_opengl.hpp
index a0a920e69..33952f7f0 100644
--- a/plugins/rendermax/renderer_opengl.hpp
+++ b/plugins/rendermax/renderer_opengl.hpp
@@ -149,7 +149,7 @@ private:
         old_opengl* p=reinterpret_cast<old_opengl*>(parent);
         float *fg = p->fg + tile * 4 * 6;
         float *bg = p->bg + tile * 4 * 6;
-        float *tex = p->tex + tile * 2 * 6;
+        // float *tex = p->tex + tile * 2 * 6;
         const float val=1/2.0;
 
         float r=rFloat()*val - val/2;
@@ -264,7 +264,7 @@ private:
         old_opengl* p=reinterpret_cast<old_opengl*>(parent);
         float *fg = p->fg + tile * 4 * 6;
         float *bg = p->bg + tile * 4 * 6;
-        float *tex = p->tex + tile * 2 * 6;
+        // float *tex = p->tex + tile * 2 * 6;
         rgbf light=lightGrid[tile];
         for (int i = 0; i < 6; i++) {
             *(fg++) *= light.r;
@@ -343,7 +343,7 @@ private:
         old_opengl* p=reinterpret_cast<old_opengl*>(parent);
         float *fg = p->fg + tile * 4 * 6;
         float *bg = p->bg + tile * 4 * 6;
-        float *tex = p->tex + tile * 2 * 6;
+        // float *tex = p->tex + tile * 2 * 6;
         rgbf fm=foreMult[tile];
         rgbf fo=foreOffset[tile];
 
diff --git a/plugins/rendermax/rendermax.cpp b/plugins/rendermax/rendermax.cpp
index 17fd6fa95..d391bdb36 100644
--- a/plugins/rendermax/rendermax.cpp
+++ b/plugins/rendermax/rendermax.cpp
@@ -139,7 +139,6 @@ static int getGridsSize(lua_State* L)
 {
     if(current_mode!=MODE_LUA)
         return -1;
-    renderer_lua* r=reinterpret_cast<renderer_lua*>(enabler->renderer);
     lua_pushnumber(L,gps->dimx);
     lua_pushnumber(L,gps->dimy);
     return 2;
diff --git a/plugins/reveal.cpp b/plugins/reveal.cpp
index 93e2041bd..39720926c 100644
--- a/plugins/reveal.cpp
+++ b/plugins/reveal.cpp
@@ -488,8 +488,6 @@ command_result revflood(color_ostream &out, vector<string> & params)
     }
     int32_t cx, cy, cz;
     Maps::getSize(x_max,y_max,z_max);
-    uint32_t tx_max = x_max * 16;
-    uint32_t ty_max = y_max * 16;
 
     Gui::getCursorCoords(cx,cy,cz);
     if(cx == -30000)
diff --git a/plugins/siege-engine.cpp b/plugins/siege-engine.cpp
index 30a582c0d..55ea4eeab 100644
--- a/plugins/siege-engine.cpp
+++ b/plugins/siege-engine.cpp
@@ -1400,7 +1400,7 @@ static int proposeUnitHits(lua_State *L)
 
 static int computeNearbyWeight(lua_State *L)
 {
-    auto engine = find_engine(L, 1);
+    find_engine(L, 1);
     luaL_checktype(L, 2, LUA_TTABLE);
     luaL_checktype(L, 3, LUA_TTABLE);
     const char *fname = luaL_optstring(L, 4, "nearby_weight");
@@ -1606,7 +1606,6 @@ struct projectile_hook : df::proj_itemst {
         df::coord target, last_passable;
         df::coord tbase = engine->target.first;
         df::coord tsize = engine->getTargetSize();
-        bool success = false;
 
         for (int i = 0; i < 50; i++)
         {
@@ -1851,7 +1850,6 @@ struct building_hook : df::building_siegeenginest {
         if (auto engine = find_engine(this))
         {
             auto job = jobs[0];
-            bool save_op = false;
             bool load_op = false;
 
             switch (job->job_type)
diff --git a/plugins/stockpiles/OrganicMatLookup.cpp b/plugins/stockpiles/OrganicMatLookup.cpp
index 09ac9c659..5167ece4a 100644
--- a/plugins/stockpiles/OrganicMatLookup.cpp
+++ b/plugins/stockpiles/OrganicMatLookup.cpp
@@ -129,7 +129,6 @@ int16_t OrganicMatLookup::food_idx_by_token ( std::ostream &out, organic_mat_cat
         MaterialInfo mat_info = food_mat_by_token ( out, token );
         int16_t type = mat_info.type;
         int32_t index = mat_info.index;
-        int16_t food_idx2 = -1;
         auto it = food_index[mat_category].find ( std::make_pair ( type, index ) );
         if ( it != food_index[mat_category].end() )
         {
diff --git a/plugins/stockpiles/stockpiles.cpp b/plugins/stockpiles/stockpiles.cpp
index f8f56b9bc..dbd255377 100644
--- a/plugins/stockpiles/stockpiles.cpp
+++ b/plugins/stockpiles/stockpiles.cpp
@@ -499,7 +499,6 @@ static std::vector<std::string> clean_dfstock_list ( const std::string &path )
 static int stockpiles_list_settings ( lua_State *L )
 {
     auto path = luaL_checkstring ( L, 1 );
-    color_ostream &out = *Lua::GetOutput ( L );
     if ( Filesystem::exists ( path ) && !Filesystem::isdir ( path ) )
     {
         lua_pushfstring ( L,  "stocksettings path invalid: %s",  path );
diff --git a/plugins/tweak/tweaks/military-assign.h b/plugins/tweak/tweaks/military-assign.h
index 45f97eac3..92b101e08 100644
--- a/plugins/tweak/tweaks/military-assign.h
+++ b/plugins/tweak/tweaks/military-assign.h
@@ -77,7 +77,7 @@ struct military_assign_hook : df::viewscreen_layer_militaryst {
             int i1 = plist->getFirstVisible(), i2 = plist->getLastVisible();
             int si = plist->getListCursor();
 
-            for (int y = y1, i = i1; i <= i2; i++, y++)
+            for (int y = y1, i = i1; i <= i2 && y <= y2; i++, y++)
             {
                 auto unit = vector_get(positions.candidates, i);
                 if (!unit || unit->military.squad_id < 0)
diff --git a/plugins/zone.cpp b/plugins/zone.cpp
index 25b4be950..385d79728 100644
--- a/plugins/zone.cpp
+++ b/plugins/zone.cpp
@@ -3626,7 +3626,6 @@ static void autobutcher_unbutcherRace(color_ostream &out, unsigned id)
 // push autobutcher settings on lua stack
 static int autobutcher_getSettings(lua_State *L)
 {
-    color_ostream &out = *Lua::GetOutput(L);
     lua_newtable(L);
     int ctable = lua_gettop(L);
     Lua::SetField(L, enable_autobutcher, ctable, "enable_autobutcher");
@@ -3642,7 +3641,6 @@ static int autobutcher_getSettings(lua_State *L)
 // push the watchlist vector as nested table on the lua stack
 static int autobutcher_getWatchList(lua_State *L)
 {
-    color_ostream &out = *Lua::GetOutput(L);
     lua_newtable(L);
 
     for(size_t i=0; i<watched_races.size(); i++)