diff --git a/src/emu/audit.c b/src/emu/audit.c
index 31b6d5f7ccb..51a92abbf8d 100644
--- a/src/emu/audit.c
+++ b/src/emu/audit.c
@@ -342,7 +342,7 @@ media_auditor::summary media_auditor::summarize(const char *name, astring *strin
 		{
 			string->catprintf("%-12s: %s", name, record->name());
 			if (record->expected_length() > 0)
-				string->catprintf(" (%d bytes)", record->expected_length());
+				string->catprintf(" (%" I64FMT "d bytes)", record->expected_length());
 			string->catprintf(" - ");
 		}
 
@@ -370,7 +370,7 @@ media_auditor::summary media_auditor::summarize(const char *name, astring *strin
 				break;
 
 			case audit_record::SUBSTATUS_FOUND_WRONG_LENGTH:
-				if (string != NULL) string->catprintf("INCORRECT LENGTH: %d bytes\n", record->actual_length());
+				if (string != NULL) string->catprintf("INCORRECT LENGTH: %" I64FMT "d bytes\n", record->actual_length());
 				break;
 
 			case audit_record::SUBSTATUS_NOT_FOUND:
diff --git a/src/emu/clifront.c b/src/emu/clifront.c
index 9499fc88175..6e9846aa0bc 100644
--- a/src/emu/clifront.c
+++ b/src/emu/clifront.c
@@ -198,7 +198,7 @@ int cli_frontend::execute(int argc, char **argv)
 			if (!found)
 			{
 				software_display_matches(config,m_options, NULL,m_options.software_name());
-				throw emu_fatalerror(MAMERR_FATALERROR, "");
+				throw emu_fatalerror(MAMERR_FATALERROR, NULL);
 			}
 		}
 		// parse the command line, adding any system-specific options
@@ -1592,11 +1592,11 @@ void cli_frontend::romident(const char *filename)
 	if (ident.matches() == ident.total())
 		return;
 	else if (ident.matches() == ident.total() - ident.nonroms())
-		throw emu_fatalerror(MAMERR_IDENT_NONROMS, "");
+		throw emu_fatalerror(MAMERR_IDENT_NONROMS, NULL);
 	else if (ident.matches() > 0)
-		throw emu_fatalerror(MAMERR_IDENT_PARTIAL, "");
+		throw emu_fatalerror(MAMERR_IDENT_PARTIAL, NULL);
 	else
-		throw emu_fatalerror(MAMERR_IDENT_NONE, "");
+		throw emu_fatalerror(MAMERR_IDENT_NONE, NULL);
 }
 
 
diff --git a/src/emu/devcpu.c b/src/emu/devcpu.c
index 8f48eff2b65..802faf1d7a7 100644
--- a/src/emu/devcpu.c
+++ b/src/emu/devcpu.c
@@ -151,7 +151,7 @@ void legacy_cpu_device::device_start()
 		if (string != NULL && string[0] != 0)
 		{
 			astring flagstr;
-			flagstr.printf("%%%ds", strlen(string));
+			flagstr.printf("%%%"SIZETFMT"s", strlen(string));
 			state_add(STATE_GENFLAGS, "GENFLAGS", m_state_io).callimport().callexport().formatstr(flagstr).noshow();
 		}
 	}
diff --git a/src/emu/dimemory.c b/src/emu/dimemory.c
index 0a638e842c1..1f1cce4ddd4 100644
--- a/src/emu/dimemory.c
+++ b/src/emu/dimemory.c
@@ -116,7 +116,7 @@ void device_memory_interface::static_set_addrmap(device_t &device, address_space
 	if (!device.interface(memory))
 		throw emu_fatalerror("MCFG_DEVICE_ADDRESS_MAP called on device '%s' with no memory interface", device.tag());
 	if (spacenum >= ARRAY_LENGTH(memory->m_address_map))
-		throw emu_fatalerror("MCFG_DEVICE_ADDRESS_MAP called with out-of-range space number %d", device.tag(), spacenum);
+		throw emu_fatalerror("MCFG_DEVICE_ADDRESS_MAP called on device '%s' with out-of-range space number %d", device.tag(), spacenum);
 	memory->m_address_map[spacenum] = map;
 }
 
diff --git a/src/emu/machine/nvram.c b/src/emu/machine/nvram.c
index c3a097d19b6..3973cbeb1eb 100644
--- a/src/emu/machine/nvram.c
+++ b/src/emu/machine/nvram.c
@@ -167,5 +167,5 @@ void nvram_device::determine_final_base()
 
 	// if we are region-backed for the default, find it now and make sure it's the right size
 	if (m_region != NULL && m_region->bytes() != m_length)
-		throw emu_fatalerror("NVRAM device '%s' has a default region, but it should be 0x%X bytes", tag(), m_length);
+		throw emu_fatalerror("NVRAM device '%s' has a default region, but it should be 0x%"I64FMT"X bytes", tag(), m_length);
 }
diff --git a/src/emu/netlist/nl_parser.h b/src/emu/netlist/nl_parser.h
index ca3a3dbb809..1f0905bfbdf 100644
--- a/src/emu/netlist/nl_parser.h
+++ b/src/emu/netlist/nl_parser.h
@@ -107,7 +107,7 @@ public:
     }
 
     token_t get_token_internal();
-    void error(const char *format, ...);
+    void error(const char *format, ...) ATTR_PRINTF(2,3);
 
 protected:
     void reset(const char *p) { m_px = p; m_line = 1; m_line_ptr = p; }
@@ -266,7 +266,7 @@ public:
             if (m_list[i].parse(setup, name))
                 return;
         }
-        setup.netlist().error("unable to find %s in source collection");
+        setup.netlist().error("unable to find %s in source collection", name.cstr());
     }
 
 private:
diff --git a/src/emu/netlist/nl_setup.c b/src/emu/netlist/nl_setup.c
index 5e3c6f7df41..23d705b6551 100644
--- a/src/emu/netlist/nl_setup.c
+++ b/src/emu/netlist/nl_setup.c
@@ -259,10 +259,10 @@ void netlist_setup_t::register_object(netlist_device_t &dev, const pstring &name
 			}
 			break;
 		case netlist_terminal_t::DEVICE:
-			netlist().error("Device registration not yet supported - \n", name.cstr());
+			netlist().error("Device registration not yet supported - %s\n", name.cstr());
 			break;
 		case netlist_terminal_t::NETLIST:
-			netlist().error("Netlist registration not yet supported - \n", name.cstr());
+			netlist().error("Netlist registration not yet supported - %s\n", name.cstr());
 			break;
 	}
 }
diff --git a/src/emu/tilemap.c b/src/emu/tilemap.c
index b840114ff49..5fa27bb0a4f 100644
--- a/src/emu/tilemap.c
+++ b/src/emu/tilemap.c
@@ -1715,9 +1715,9 @@ void tilemap_device::device_start()
 {
 	// check configuration
 	if (m_get_info.isnull())
-		throw emu_fatalerror("Tilemap device '%s' has no get info callback!");
+		throw emu_fatalerror("Tilemap device '%s' has no get info callback!", tag());
 	if (m_standard_mapper == TILEMAP_STANDARD_COUNT && m_mapper.isnull())
-		throw emu_fatalerror("Tilemap device '%s' has no mapper callback!");
+		throw emu_fatalerror("Tilemap device '%s' has no mapper callback!", tag());
 
 	// bind our callbacks
 	m_get_info.bind_relative_to(*owner());
diff --git a/src/osd/osdcomm.h b/src/osd/osdcomm.h
index 595f5b595ce..375db9d9058 100644
--- a/src/osd/osdcomm.h
+++ b/src/osd/osdcomm.h
@@ -164,6 +164,12 @@ __extension__ typedef signed long long      INT64;
 #define I64FMT   "ll"
 #endif
 
+#if defined(_MSVC_VER) || defined(__MINGW32__)
+#define SIZETFMT   "I64u"
+#else
+#define SIZETFMT   "zu"
+#endif
+
 
 /* Highly useful macro for compile-time knowledge of an array size */
 #define ARRAY_LENGTH(x)     (sizeof(x) / sizeof(x[0]))
diff --git a/src/tools/chdman.c b/src/tools/chdman.c
index d0bd1429822..5c1068c8099 100644
--- a/src/tools/chdman.c
+++ b/src/tools/chdman.c
@@ -95,7 +95,7 @@ const int MODE_GDI = 2;
 
 typedef tagmap_t<astring *> parameters_t;
 
-static void report_error(int error, const char *format, ...);
+static void report_error(int error, const char *format, ...) ATTR_PRINTF(2,3);
 static void do_info(parameters_t &params);
 static void do_verify(parameters_t &params);
 static void do_create_raw(parameters_t &params);
@@ -2519,14 +2519,14 @@ static void do_extract_ld(parameters_t &params)
 			// read the hunk into the buffers
 			chd_error err = input_chd.read_hunk(framenum, NULL);
 			if (err != CHDERR_NONE)
-				report_error(1, "Error reading hunk %d from CHD file (%s): %s\n", framenum, params.find(OPTION_INPUT)->cstr(), chd_file::error_string(err));
+				report_error(1, "Error reading hunk %"I64FMT"d from CHD file (%s): %s\n", framenum, params.find(OPTION_INPUT)->cstr(), chd_file::error_string(err));
 
 			// write audio
 			for (int chnum = 0; chnum < channels; chnum++)
 			{
 				avi_error avierr = avi_append_sound_samples(output_file, chnum, avconfig.audio[chnum], actsamples, 0);
 				if (avierr != AVIERR_NONE)
-					report_error(1, "Error writing samples for hunk %d to file (%s): %s\n", framenum, output_file_str->cstr(), avi_error_string(avierr));
+					report_error(1, "Error writing samples for hunk %"I64FMT"d to file (%s): %s\n", framenum, output_file_str->cstr(), avi_error_string(avierr));
 			}
 
 			// write video
@@ -2534,7 +2534,7 @@ static void do_extract_ld(parameters_t &params)
 			{
 				avi_error avierr = avi_append_video_frame(output_file, fullbitmap);
 				if (avierr != AVIERR_NONE)
-					report_error(1, "Error writing video for hunk %d to file (%s): %s\n", framenum, output_file_str->cstr(), avi_error_string(avierr));
+					report_error(1, "Error writing video for hunk %"I64FMT"d to file (%s): %s\n", framenum, output_file_str->cstr(), avi_error_string(avierr));
 			}
 		}