diff --git a/channels/tsmf/client/tsmf_main.c b/channels/tsmf/client/tsmf_main.c
index 040c94e09..ba88be091 100644
--- a/channels/tsmf/client/tsmf_main.c
+++ b/channels/tsmf/client/tsmf_main.c
@@ -167,7 +167,7 @@ static UINT tsmf_on_data_received(IWTSVirtualChannelCallback* pChannelCallback,
 	ifman.output_pending = FALSE;
 	ifman.output_interface_id = InterfaceId;
 
-	// fprintf(stderr, "InterfaceId: 0x%08"PRIX32" MessageId: 0x%08"PRIX32" FunctionId:
+	// (void)fprintf(stderr, "InterfaceId: 0x%08"PRIX32" MessageId: 0x%08"PRIX32" FunctionId:
 	// 0x%08"PRIX32"\n", InterfaceId, MessageId, FunctionId);
 
 	switch (InterfaceId)
diff --git a/client/Mac/cli/AppDelegate.m b/client/Mac/cli/AppDelegate.m
index 4be6bfb1c..8c13e8569 100644
--- a/client/Mac/cli/AppDelegate.m
+++ b/client/Mac/cli/AppDelegate.m
@@ -288,7 +288,7 @@ void AppDelegate_EmbedWindowEventHandler(void *ctx, const EmbedWindowEventArgs *
 void AppDelegate_ResizeWindowEventHandler(void *ctx, const ResizeWindowEventArgs *e)
 {
 	rdpContext *context = (rdpContext *)ctx;
-	fprintf(stderr, "ResizeWindowEventHandler: %d %d\n", e->width, e->height);
+	(void)fprintf(stderr, "ResizeWindowEventHandler: %d %d\n", e->width, e->height);
 
 	if (_singleDelegate)
 	{
diff --git a/libfreerdp/codec/h264_mf.c b/libfreerdp/codec/h264_mf.c
index 978d62d2b..4bdc3882f 100644
--- a/libfreerdp/codec/h264_mf.c
+++ b/libfreerdp/codec/h264_mf.c
@@ -375,7 +375,7 @@ static int mf_decompress(H264_CONTEXT* h264, const BYTE* pSrcData, UINT32 SrcSiz
 	inputSample->lpVtbl->Release(inputSample);
 	return 1;
 error:
-	fprintf(stderr, "mf_decompress error\n");
+	(void)fprintf(stderr, "mf_decompress error\n");
 	return -1;
 }
 
diff --git a/libfreerdp/gdi/gfx.c b/libfreerdp/gdi/gfx.c
index 7972243f7..4d2ad7591 100644
--- a/libfreerdp/gdi/gfx.c
+++ b/libfreerdp/gdi/gfx.c
@@ -922,21 +922,21 @@ static void dump_cmd(const RDPGFX_SURFACE_COMMAND* cmd, UINT32 frameId)
 	FILE* fp = fopen(fname, "w");
 	if (!fp)
 		return;
-	fprintf(fp, "frameid: %" PRIu32 "\n", frameId);
-	fprintf(fp, "surfaceId: %" PRIu32 "\n", cmd->surfaceId);
-	fprintf(fp, "codecId: %" PRIu32 "\n", cmd->codecId);
-	fprintf(fp, "contextId: %" PRIu32 "\n", cmd->contextId);
-	fprintf(fp, "format: %" PRIu32 "\n", cmd->format);
-	fprintf(fp, "left: %" PRIu32 "\n", cmd->left);
-	fprintf(fp, "top: %" PRIu32 "\n", cmd->top);
-	fprintf(fp, "right: %" PRIu32 "\n", cmd->right);
-	fprintf(fp, "bottom: %" PRIu32 "\n", cmd->bottom);
-	fprintf(fp, "width: %" PRIu32 "\n", cmd->width);
-	fprintf(fp, "height: %" PRIu32 "\n", cmd->height);
-	fprintf(fp, "length: %" PRIu32 "\n", cmd->length);
+	(void)fprintf(fp, "frameid: %" PRIu32 "\n", frameId);
+	(void)fprintf(fp, "surfaceId: %" PRIu32 "\n", cmd->surfaceId);
+	(void)fprintf(fp, "codecId: %" PRIu32 "\n", cmd->codecId);
+	(void)fprintf(fp, "contextId: %" PRIu32 "\n", cmd->contextId);
+	(void)fprintf(fp, "format: %" PRIu32 "\n", cmd->format);
+	(void)fprintf(fp, "left: %" PRIu32 "\n", cmd->left);
+	(void)fprintf(fp, "top: %" PRIu32 "\n", cmd->top);
+	(void)fprintf(fp, "right: %" PRIu32 "\n", cmd->right);
+	(void)fprintf(fp, "bottom: %" PRIu32 "\n", cmd->bottom);
+	(void)fprintf(fp, "width: %" PRIu32 "\n", cmd->width);
+	(void)fprintf(fp, "height: %" PRIu32 "\n", cmd->height);
+	(void)fprintf(fp, "length: %" PRIu32 "\n", cmd->length);
 
 	char* bdata = crypto_base64_encode_ex(cmd->data, cmd->length, FALSE);
-	fprintf(fp, "data: %s\n", bdata);
+	(void)fprintf(fp, "data: %s\n", bdata);
 	free(bdata);
 	fclose(fp);
 }
diff --git a/libfreerdp/gdi/test/TestGdiBitBlt.c b/libfreerdp/gdi/test/TestGdiBitBlt.c
index 5363abb85..9f8c12c59 100644
--- a/libfreerdp/gdi/test/TestGdiBitBlt.c
+++ b/libfreerdp/gdi/test/TestGdiBitBlt.c
@@ -407,7 +407,7 @@ static BOOL test_rop(HGDI_DC hdcDst, HGDI_DC hdcSrc, HGDI_BITMAP hBmpSrc, HGDI_B
 
 	success = TRUE;
 fail:
-	fprintf(stderr, "[%s] ROP=%s returned %d\n", __func__, gdi_rop_to_string(rop), success);
+	(void)fprintf(stderr, "[%s] ROP=%s returned %d\n", __func__, gdi_rop_to_string(rop), success);
 	return success;
 }
 
diff --git a/libfreerdp/locale/keyboard_layout.c b/libfreerdp/locale/keyboard_layout.c
index da0df533c..1eb24bef3 100644
--- a/libfreerdp/locale/keyboard_layout.c
+++ b/libfreerdp/locale/keyboard_layout.c
@@ -920,7 +920,7 @@ static BOOL load_layout_file(void)
 		FILE* fp = winpr_fopen("/tmp/kbd.json", "w");
 		if (!fp)
 			goto end;
-		fprintf(fp, "%s", str);
+		(void)fprintf(fp, "%s", str);
 		fclose(fp);
 	}
 end:
diff --git a/winpr/libwinpr/comm/test/TestCommConfig.c b/winpr/libwinpr/comm/test/TestCommConfig.c
index 616856488..ecb6ffc0f 100644
--- a/winpr/libwinpr/comm/test/TestCommConfig.c
+++ b/winpr/libwinpr/comm/test/TestCommConfig.c
@@ -39,22 +39,22 @@ int TestCommConfig(int argc, char* argv[])
 
 	if (hComm && (hComm != INVALID_HANDLE_VALUE))
 	{
-		fprintf(stderr,
-		        "CreateFileA failure: could create a handle on a not yet defined device: %s\n",
-		        lpFileName);
+		(void)fprintf(
+		    stderr, "CreateFileA failure: could create a handle on a not yet defined device: %s\n",
+		    lpFileName);
 		return EXIT_FAILURE;
 	}
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	success = DefineCommDevice(lpFileName, "/dev/ttyS0");
 	if (!success)
 	{
-		fprintf(stderr, "DefineCommDevice failure: %s\n", lpFileName);
+		(void)fprintf(stderr, "DefineCommDevice failure: %s\n", lpFileName);
 		return EXIT_FAILURE;
 	}
 
@@ -64,9 +64,9 @@ int TestCommConfig(int argc, char* argv[])
 	                    0, (HANDLE)1234); /* invalid parmaeter */
 	if (hComm != INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr,
-		        "CreateFileA failure: could create a handle with some invalid parameters %s\n",
-		        lpFileName);
+		(void)fprintf(
+		    stderr, "CreateFileA failure: could create a handle with some invalid parameters %s\n",
+		    lpFileName);
 		return EXIT_FAILURE;
 	}
 
@@ -74,8 +74,8 @@ int TestCommConfig(int argc, char* argv[])
 
 	if (!hComm || (hComm == INVALID_HANDLE_VALUE))
 	{
-		fprintf(stderr, "CreateFileA failure: %s GetLastError() = 0x%08x\n", lpFileName,
-		        GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: %s GetLastError() = 0x%08x\n", lpFileName,
+		              GetLastError());
 		return EXIT_FAILURE;
 	}
 
@@ -86,29 +86,31 @@ int TestCommConfig(int argc, char* argv[])
 	success = GetCommState(hComm, &dcb);
 	if (!success)
 	{
-		fprintf(stderr, "GetCommState failure: GetLastError() = Ox%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: GetLastError() = Ox%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
-	fprintf(stderr,
-	        "BaudRate: %" PRIu32 " ByteSize: %" PRIu8 " Parity: %" PRIu8 " StopBits: %" PRIu8 "\n",
-	        dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
+	(void)fprintf(stderr,
+	              "BaudRate: %" PRIu32 " ByteSize: %" PRIu8 " Parity: %" PRIu8 " StopBits: %" PRIu8
+	              "\n",
+	              dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
 
 	if (!GetCommProperties(hComm, &commProp))
 	{
-		fprintf(stderr, "GetCommProperties failure: GetLastError(): 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommProperties failure: GetLastError(): 0x%08x\n",
+		              GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	if ((commProp.dwSettableBaud & BAUD_57600) <= 0)
 	{
-		fprintf(stderr, "BAUD_57600 unsupported!\n");
+		(void)fprintf(stderr, "BAUD_57600 unsupported!\n");
 		return EXIT_FAILURE;
 	}
 
 	if ((commProp.dwSettableBaud & BAUD_14400) > 0)
 	{
-		fprintf(stderr, "BAUD_14400 supported!\n");
+		(void)fprintf(stderr, "BAUD_14400 supported!\n");
 		return EXIT_FAILURE;
 	}
 
@@ -121,7 +123,7 @@ int TestCommConfig(int argc, char* argv[])
 
 	if (!success)
 	{
-		fprintf(stderr, "SetCommState failure: GetLastError() = 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: GetLastError() = 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
@@ -129,17 +131,17 @@ int TestCommConfig(int argc, char* argv[])
 
 	if (!success)
 	{
-		fprintf(stderr, "GetCommState failure: GetLastError() = 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: GetLastError() = 0x%x\n", GetLastError());
 		return 0;
 	}
 
 	if ((dcb.BaudRate != CBR_57600) || (dcb.ByteSize != 8) || (dcb.Parity != NOPARITY) ||
 	    (dcb.StopBits != ONESTOPBIT))
 	{
-		fprintf(stderr,
-		        "Got an unexpeted value among: BaudRate: %" PRIu32 " ByteSize: %" PRIu8
-		        " Parity: %" PRIu8 " StopBits: %" PRIu8 "\n",
-		        dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
+		(void)fprintf(stderr,
+		              "Got an unexpeted value among: BaudRate: %" PRIu32 " ByteSize: %" PRIu8
+		              " Parity: %" PRIu8 " StopBits: %" PRIu8 "\n",
+		              dcb.BaudRate, dcb.ByteSize, dcb.Parity, dcb.StopBits);
 	}
 
 	CloseHandle(hComm);
diff --git a/winpr/libwinpr/comm/test/TestControlSettings.c b/winpr/libwinpr/comm/test/TestControlSettings.c
index 1ce6ac2b0..1a1ad269b 100644
--- a/winpr/libwinpr/comm/test/TestControlSettings.c
+++ b/winpr/libwinpr/comm/test/TestControlSettings.c
@@ -35,21 +35,21 @@ int TestControlSettings(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	result = DefineCommDevice("COM1", "/dev/ttyS0");
 	if (!result)
 	{
-		fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hComm == INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
@@ -57,7 +57,7 @@ int TestControlSettings(int argc, char* argv[])
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -69,7 +69,7 @@ int TestControlSettings(int argc, char* argv[])
 
 	if (!SetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "SetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -77,13 +77,13 @@ int TestControlSettings(int argc, char* argv[])
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if ((dcb.ByteSize != 5) || (dcb.StopBits != ONESTOPBIT) || (dcb.Parity != MARKPARITY))
 	{
-		fprintf(stderr, "test1 failed.\n");
+		(void)fprintf(stderr, "test1 failed.\n");
 		return FALSE;
 	}
 
@@ -95,7 +95,7 @@ int TestControlSettings(int argc, char* argv[])
 
 	if (!SetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "SetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -103,19 +103,19 @@ int TestControlSettings(int argc, char* argv[])
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if ((dcb.ByteSize != 8) || (dcb.StopBits != ONESTOPBIT) || (dcb.Parity != NOPARITY))
 	{
-		fprintf(stderr, "test2 failed.\n");
+		(void)fprintf(stderr, "test2 failed.\n");
 		return FALSE;
 	}
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/comm/test/TestGetCommState.c b/winpr/libwinpr/comm/test/TestGetCommState.c
index 372d777d9..914911053 100644
--- a/winpr/libwinpr/comm/test/TestGetCommState.c
+++ b/winpr/libwinpr/comm/test/TestGetCommState.c
@@ -83,7 +83,7 @@ int TestGetCommState(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
@@ -131,7 +131,7 @@ int TestGetCommState(int argc, char* argv[])
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/comm/test/TestHandflow.c b/winpr/libwinpr/comm/test/TestHandflow.c
index 3c5b4c734..6e7f7330f 100644
--- a/winpr/libwinpr/comm/test/TestHandflow.c
+++ b/winpr/libwinpr/comm/test/TestHandflow.c
@@ -43,48 +43,48 @@ int TestHandflow(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	result = DefineCommDevice("COM1", "/dev/ttyS0");
 	if (!result)
 	{
-		fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hComm == INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerialSys);
 	if (!test_SerialSys(hComm))
 	{
-		fprintf(stderr, "test_SerCxSys failure\n");
+		(void)fprintf(stderr, "test_SerCxSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	/* _comm_setServerSerialDriver(hComm, SerialDriverSerCxSys); */
 	/* if (!test_SerCxSys(hComm)) */
 	/* { */
-	/* 	fprintf(stderr, "test_SerCxSys failure\n"); */
+	/* 	(void)fprintf(stderr, "test_SerCxSys failure\n"); */
 	/* 	return EXIT_FAILURE; */
 	/* } */
 
 	/* _comm_setServerSerialDriver(hComm, SerialDriverSerCx2Sys); */
 	/* if (!test_SerCx2Sys(hComm)) */
 	/* { */
-	/* 	fprintf(stderr, "test_SerCxSys failure\n"); */
+	/* 	(void)fprintf(stderr, "test_SerCxSys failure\n"); */
 	/* 	return EXIT_FAILURE; */
 	/* } */
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/comm/test/TestSerialChars.c b/winpr/libwinpr/comm/test/TestSerialChars.c
index b744a03d8..aebcbfce3 100644
--- a/winpr/libwinpr/comm/test/TestSerialChars.c
+++ b/winpr/libwinpr/comm/test/TestSerialChars.c
@@ -39,20 +39,20 @@ static BOOL test_SerCxSys(HANDLE hComm)
 
 	if (tcgetattr(((WINPR_COMM*)hComm)->fd, &currentTermios) < 0)
 	{
-		fprintf(stderr, "tcgetattr failure.\n");
+		(void)fprintf(stderr, "tcgetattr failure.\n");
 		return FALSE;
 	}
 
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if ((dcb.XonChar == '\0') || (dcb.XoffChar == '\0'))
 	{
-		fprintf(stderr, "test_SerCxSys failure, expected XonChar and XoffChar to be set\n");
+		(void)fprintf(stderr, "test_SerCxSys failure, expected XonChar and XoffChar to be set\n");
 		return FALSE;
 	}
 
@@ -60,7 +60,7 @@ static BOOL test_SerCxSys(HANDLE hComm)
 	if ((dcb.XonChar != currentTermios.c_cc[VSTART]) ||
 	    (dcb.XoffChar != currentTermios.c_cc[VSTOP]))
 	{
-		fprintf(stderr, "test_SerCxSys failure, could not retrieve XonChar and XoffChar\n");
+		(void)fprintf(stderr, "test_SerCxSys failure, could not retrieve XonChar and XoffChar\n");
 		return FALSE;
 	}
 
@@ -72,7 +72,7 @@ static BOOL test_SerCxSys(HANDLE hComm)
 	dcb.XoffChar = XonChar;
 	if (!SetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "SetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -80,13 +80,13 @@ static BOOL test_SerCxSys(HANDLE hComm)
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure, GetLastError(): 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if ((dcb.XonChar != XoffChar) || (dcb.XoffChar != XonChar))
 	{
-		fprintf(stderr, "test_SerCxSys, expected XonChar and XoffChar to be swapped\n");
+		(void)fprintf(stderr, "test_SerCxSys, expected XonChar and XoffChar to be swapped\n");
 		return FALSE;
 	}
 
@@ -94,14 +94,15 @@ static BOOL test_SerCxSys(HANDLE hComm)
 	dcb.XonChar = dcb.XoffChar;
 	if (SetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "test_SerCxSys failure, SetCommState() was supposed to failed because "
-		                "XonChar and XoffChar are the same\n");
+		(void)fprintf(stderr,
+		              "test_SerCxSys failure, SetCommState() was supposed to failed because "
+		              "XonChar and XoffChar are the same\n");
 		return FALSE;
 	}
 	if (GetLastError() != ERROR_INVALID_PARAMETER)
 	{
-		fprintf(stderr, "test_SerCxSys failure, SetCommState() was supposed to failed with "
-		                "GetLastError()=ERROR_INVALID_PARAMETER\n");
+		(void)fprintf(stderr, "test_SerCxSys failure, SetCommState() was supposed to failed with "
+		                      "GetLastError()=ERROR_INVALID_PARAMETER\n");
 		return FALSE;
 	}
 
@@ -115,14 +116,14 @@ static BOOL test_SerCx2Sys(HANDLE hComm)
 	dcb.DCBlength = sizeof(DCB);
 	if (!GetCommState(hComm, &dcb))
 	{
-		fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure; GetLastError(): %08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if ((dcb.ErrorChar != '\0') || (dcb.EofChar != '\0') || (dcb.EvtChar != '\0') ||
 	    (dcb.XonChar != '\0') || (dcb.XoffChar != '\0'))
 	{
-		fprintf(stderr, "test_SerCx2Sys failure, expected all characters to be: '\\0'\n");
+		(void)fprintf(stderr, "test_SerCx2Sys failure, expected all characters to be: '\\0'\n");
 		return FALSE;
 	}
 
@@ -137,41 +138,41 @@ int TestSerialChars(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	result = DefineCommDevice("COM1", "/dev/ttyS0");
 	if (!result)
 	{
-		fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hComm == INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCxSys);
 	if (!test_SerCxSys(hComm))
 	{
-		fprintf(stderr, "test_SerCxSys failure\n");
+		(void)fprintf(stderr, "test_SerCxSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCx2Sys);
 	if (!test_SerCx2Sys(hComm))
 	{
-		fprintf(stderr, "test_SerCxSys failure\n");
+		(void)fprintf(stderr, "test_SerCxSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/comm/test/TestSetCommState.c b/winpr/libwinpr/comm/test/TestSetCommState.c
index c74a65971..1fd2e90c5 100644
--- a/winpr/libwinpr/comm/test/TestSetCommState.c
+++ b/winpr/libwinpr/comm/test/TestSetCommState.c
@@ -44,7 +44,7 @@ static BOOL test_fParity(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
@@ -53,7 +53,7 @@ static BOOL test_fParity(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
@@ -61,13 +61,13 @@ static BOOL test_fParity(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
 	if (!dcb.fParity)
 	{
-		fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of TRUE\n", dcb.fParity);
+		(void)fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of TRUE\n", dcb.fParity);
 		return FALSE;
 	}
 
@@ -76,7 +76,7 @@ static BOOL test_fParity(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
@@ -84,13 +84,13 @@ static BOOL test_fParity(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
 	if (dcb.fParity)
 	{
-		fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of FALSE\n", dcb.fParity);
+		(void)fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of FALSE\n", dcb.fParity);
 		return FALSE;
 	}
 
@@ -99,7 +99,7 @@ static BOOL test_fParity(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
@@ -107,13 +107,13 @@ static BOOL test_fParity(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%08" PRIx32 "\n", GetLastError());
 		return FALSE;
 	}
 
 	if (!dcb.fParity)
 	{
-		fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of TRUE\n", dcb.fParity);
+		(void)fprintf(stderr, "unexpected fParity: %" PRIu32 " instead of TRUE\n", dcb.fParity);
 		return FALSE;
 	}
 
@@ -129,7 +129,7 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -138,7 +138,7 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -146,13 +146,13 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 	if (dcb.BaudRate != CBR_115200)
 	{
-		fprintf(stderr, "SetCommState failure: could not set BaudRate=%d (CBR_115200)\n",
-		        CBR_115200);
+		(void)fprintf(stderr, "SetCommState failure: could not set BaudRate=%d (CBR_115200)\n",
+		              CBR_115200);
 		return FALSE;
 	}
 
@@ -162,7 +162,7 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -170,12 +170,13 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 	if (dcb.BaudRate != CBR_57600)
 	{
-		fprintf(stderr, "SetCommState failure: could not set BaudRate=%d (CBR_57600)\n", CBR_57600);
+		(void)fprintf(stderr, "SetCommState failure: could not set BaudRate=%d (CBR_57600)\n",
+		              CBR_57600);
 		return FALSE;
 	}
 
@@ -184,8 +185,9 @@ static BOOL test_SerialSys(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (result)
 	{
-		fprintf(stderr, "SetCommState failure: unexpected support of BaudRate=%d (CBR_128000)\n",
-		        CBR_128000);
+		(void)fprintf(stderr,
+		              "SetCommState failure: unexpected support of BaudRate=%d (CBR_128000)\n",
+		              CBR_128000);
 		return FALSE;
 	}
 
@@ -214,7 +216,7 @@ static BOOL test_generic(HANDLE hComm)
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 
@@ -223,21 +225,21 @@ static BOOL test_generic(HANDLE hComm)
 	result = SetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "SetCommState failure: 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommState failure: 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
 	result = GetCommState(hComm, &dcb);
 	if (!result)
 	{
-		fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommState failure: 0x%x\n", GetLastError());
 		return FALSE;
 	}
 
 	if (memcmp(&dcb, &dcb2, sizeof(DCB)) != 0)
 	{
-		fprintf(stderr,
-		        "DCB is different after SetCommState() whereas it should have not changed\n");
+		(void)fprintf(stderr,
+		              "DCB is different after SetCommState() whereas it should have not changed\n");
 		return FALSE;
 	}
 
@@ -248,7 +250,7 @@ static BOOL test_generic(HANDLE hComm)
 	/* fParity tests */
 	if (!test_fParity(hComm))
 	{
-		fprintf(stderr, "test_fParity failure\n");
+		(void)fprintf(stderr, "test_fParity failure\n");
 		return FALSE;
 	}
 
@@ -263,69 +265,69 @@ int TestSetCommState(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	result = DefineCommDevice("COM1", "/dev/ttyS0");
 	if (!result)
 	{
-		fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hComm == INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_generic failure (SerialDriverUnknown)\n");
+		(void)fprintf(stderr, "test_generic failure (SerialDriverUnknown)\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerialSys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_generic failure (SerialDriverSerialSys)\n");
+		(void)fprintf(stderr, "test_generic failure (SerialDriverSerialSys)\n");
 		return EXIT_FAILURE;
 	}
 	if (!test_SerialSys(hComm))
 	{
-		fprintf(stderr, "test_SerialSys failure\n");
+		(void)fprintf(stderr, "test_SerialSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCxSys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_generic failure (SerialDriverSerCxSys)\n");
+		(void)fprintf(stderr, "test_generic failure (SerialDriverSerCxSys)\n");
 		return EXIT_FAILURE;
 	}
 	if (!test_SerCxSys(hComm))
 	{
-		fprintf(stderr, "test_SerCxSys failure\n");
+		(void)fprintf(stderr, "test_SerCxSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCx2Sys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_generic failure (SerialDriverSerCx2Sys)\n");
+		(void)fprintf(stderr, "test_generic failure (SerialDriverSerCx2Sys)\n");
 		return EXIT_FAILURE;
 	}
 	if (!test_SerCx2Sys(hComm))
 	{
-		fprintf(stderr, "test_SerCx2Sys failure\n");
+		(void)fprintf(stderr, "test_SerCx2Sys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/comm/test/TestTimeouts.c b/winpr/libwinpr/comm/test/TestTimeouts.c
index 49bb8c6b7..76a5dec24 100644
--- a/winpr/libwinpr/comm/test/TestTimeouts.c
+++ b/winpr/libwinpr/comm/test/TestTimeouts.c
@@ -42,19 +42,19 @@ static BOOL test_generic(HANDLE hComm)
 
 	if (!SetCommTimeouts(hComm, &timeouts))
 	{
-		fprintf(stderr, "SetCommTimeouts failure, GetLastError: 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "SetCommTimeouts failure, GetLastError: 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if (!GetCommTimeouts(hComm, &timeouts2))
 	{
-		fprintf(stderr, "GetCommTimeouts failure, GetLastError: 0x%08x\n", GetLastError());
+		(void)fprintf(stderr, "GetCommTimeouts failure, GetLastError: 0x%08x\n", GetLastError());
 		return FALSE;
 	}
 
 	if (memcmp(&timeouts, &timeouts2, sizeof(COMMTIMEOUTS)) != 0)
 	{
-		fprintf(stderr, "TestTimeouts failure, didn't get back the same timeouts.\n");
+		(void)fprintf(stderr, "TestTimeouts failure, didn't get back the same timeouts.\n");
 		return FALSE;
 	}
 
@@ -63,19 +63,21 @@ static BOOL test_generic(HANDLE hComm)
 	timeouts.ReadTotalTimeoutConstant = MAXULONG;
 	if (SetCommTimeouts(hComm, &timeouts))
 	{
-		fprintf(stderr,
-		        "SetCommTimeouts succeeded with ReadIntervalTimeout and ReadTotalTimeoutConstant "
-		        "set to MAXULONG. GetLastError: 0x%08x\n",
-		        GetLastError());
+		(void)fprintf(
+		    stderr,
+		    "SetCommTimeouts succeeded with ReadIntervalTimeout and ReadTotalTimeoutConstant "
+		    "set to MAXULONG. GetLastError: 0x%08x\n",
+		    GetLastError());
 		return FALSE;
 	}
 
 	if (GetLastError() != ERROR_INVALID_PARAMETER)
 	{
-		fprintf(stderr,
-		        "SetCommTimeouts failure, expected GetLastError to return ERROR_INVALID_PARAMETER "
-		        "and got: 0x%08x\n",
-		        GetLastError());
+		(void)fprintf(
+		    stderr,
+		    "SetCommTimeouts failure, expected GetLastError to return ERROR_INVALID_PARAMETER "
+		    "and got: 0x%08x\n",
+		    GetLastError());
 		return FALSE;
 	}
 
@@ -90,48 +92,48 @@ int TestTimeouts(int argc, char* argv[])
 
 	if (stat("/dev/ttyS0", &statbuf) < 0)
 	{
-		fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
+		(void)fprintf(stderr, "/dev/ttyS0 not available, making the test to succeed though\n");
 		return EXIT_SUCCESS;
 	}
 
 	result = DefineCommDevice("COM1", "/dev/ttyS0");
 	if (!result)
 	{
-		fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "DefineCommDevice failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hComm == INVALID_HANDLE_VALUE)
 	{
-		fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
+		(void)fprintf(stderr, "CreateFileA failure: 0x%x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerialSys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_SerialSys failure\n");
+		(void)fprintf(stderr, "test_SerialSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCxSys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_SerCxSys failure\n");
+		(void)fprintf(stderr, "test_SerCxSys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	_comm_setServerSerialDriver(hComm, SerialDriverSerCx2Sys);
 	if (!test_generic(hComm))
 	{
-		fprintf(stderr, "test_SerCx2Sys failure\n");
+		(void)fprintf(stderr, "test_SerCx2Sys failure\n");
 		return EXIT_FAILURE;
 	}
 
 	if (!CloseHandle(hComm))
 	{
-		fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
+		(void)fprintf(stderr, "CloseHandle failure, GetLastError()=%08x\n", GetLastError());
 		return EXIT_FAILURE;
 	}
 
diff --git a/winpr/libwinpr/crypto/test/TestCryptoRand.c b/winpr/libwinpr/crypto/test/TestCryptoRand.c
index 7dde55e95..3935d7e7f 100644
--- a/winpr/libwinpr/crypto/test/TestCryptoRand.c
+++ b/winpr/libwinpr/crypto/test/TestCryptoRand.c
@@ -14,7 +14,7 @@ int TestCryptoRand(int argc, char* argv[])
 	winpr_RAND(rnd, sizeof(rnd));
 
 	str = winpr_BinToHexString(rnd, sizeof(rnd), FALSE);
-	// fprintf(stderr, "Rand: %s\n", str);
+	// (void)fprintf(stderr, "Rand: %s\n", str);
 	free(str);
 
 	if (memcmp(rnd, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16) == 0)
diff --git a/winpr/libwinpr/interlocked/interlocked.c b/winpr/libwinpr/interlocked/interlocked.c
index 6c3b0c5ea..b560f5947 100644
--- a/winpr/libwinpr/interlocked/interlocked.c
+++ b/winpr/libwinpr/interlocked/interlocked.c
@@ -332,7 +332,8 @@ LONGLONG InterlockedCompareExchange64(LONGLONG volatile* Destination, LONGLONG E
 	if (locked)
 		ReleaseMutex(mutex);
 	else
-		fprintf(stderr, "WARNING: InterlockedCompareExchange64 operation might have failed\n");
+		(void)fprintf(stderr,
+		              "WARNING: InterlockedCompareExchange64 operation might have failed\n");
 
 	return previousValue;
 }
diff --git a/winpr/libwinpr/synch/test/TestSynchMultipleThreads.c b/winpr/libwinpr/synch/test/TestSynchMultipleThreads.c
index 34820f148..68f5880c7 100644
--- a/winpr/libwinpr/synch/test/TestSynchMultipleThreads.c
+++ b/winpr/libwinpr/synch/test/TestSynchMultipleThreads.c
@@ -34,7 +34,7 @@ static int start_threads(size_t count, HANDLE* threads)
 
 		if (!threads[i])
 		{
-			fprintf(stderr, "%s: CreateThread [%" PRIuz "] failure\n", __func__, i);
+			(void)fprintf(stderr, "%s: CreateThread [%" PRIuz "] failure\n", __func__, i);
 			return -1;
 		}
 	}
@@ -55,7 +55,7 @@ static int close_threads(DWORD count, HANDLE* threads)
 
 		if (!CloseHandle(threads[i]))
 		{
-			fprintf(stderr, "%s: CloseHandle [%" PRIu32 "] failure\n", __func__, i);
+			(void)fprintf(stderr, "%s: CloseHandle [%" PRIu32 "] failure\n", __func__, i);
 			rc = -1;
 		}
 		threads[i] = NULL;
@@ -71,21 +71,21 @@ static BOOL TestWaitForAll(void)
 	/* WaitForAll, timeout */
 	if (start_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: start_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: start_threads failed\n", __func__);
 		goto fail;
 	}
 
 	const DWORD ret = WaitForMultipleObjects(ARRAYSIZE(threads), threads, TRUE, 10);
 	if (ret != WAIT_TIMEOUT)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, timeout 10 failed, ret=%d\n",
-		        __func__, ret);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, timeout 10 failed, ret=%d\n",
+		              __func__, ret);
 		goto fail;
 	}
 
 	if (WaitForMultipleObjects(ARRAYSIZE(threads), threads, TRUE, INFINITE) != WAIT_OBJECT_0)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
 		goto fail;
 	}
 
@@ -93,7 +93,7 @@ static BOOL TestWaitForAll(void)
 fail:
 	if (close_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: close_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: close_threads failed\n", __func__);
 		return FALSE;
 	}
 
@@ -107,20 +107,20 @@ static BOOL TestWaitOne(void)
 	/* WaitForAll, timeout */
 	if (start_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: start_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: start_threads failed\n", __func__);
 		goto fail;
 	}
 
 	const DWORD ret = WaitForMultipleObjects(ARRAYSIZE(threads), threads, FALSE, INFINITE);
 	if (ret > (WAIT_OBJECT_0 + ARRAYSIZE(threads)))
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects INFINITE failed\n", __func__);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects INFINITE failed\n", __func__);
 		goto fail;
 	}
 
 	if (WaitForMultipleObjects(ARRAYSIZE(threads), threads, TRUE, INFINITE) != WAIT_OBJECT_0)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
 		goto fail;
 	}
 
@@ -128,7 +128,7 @@ static BOOL TestWaitOne(void)
 fail:
 	if (close_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: close_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: close_threads failed\n", __func__);
 		return FALSE;
 	}
 
@@ -142,27 +142,28 @@ static BOOL TestWaitOneTimeout(void)
 	/* WaitForAll, timeout */
 	if (start_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: start_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: start_threads failed\n", __func__);
 		goto fail;
 	}
 
 	const DWORD ret = WaitForMultipleObjects(ARRAYSIZE(threads), threads, FALSE, 1);
 	if (ret != WAIT_TIMEOUT)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects timeout 50 failed, ret=%d\n", __func__, ret);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects timeout 50 failed, ret=%d\n", __func__,
+		              ret);
 		goto fail;
 	}
 
 	if (WaitForMultipleObjects(ARRAYSIZE(threads), threads, TRUE, INFINITE) != WAIT_OBJECT_0)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
 		goto fail;
 	}
 	rc = TRUE;
 fail:
 	if (close_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: close_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: close_threads failed\n", __func__);
 		return FALSE;
 	}
 
@@ -176,7 +177,7 @@ static BOOL TestWaitOneTimeoutMultijoin(void)
 	/* WaitForAll, timeout */
 	if (start_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: start_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: start_threads failed\n", __func__);
 		goto fail;
 	}
 
@@ -185,14 +186,15 @@ static BOOL TestWaitOneTimeoutMultijoin(void)
 		const DWORD ret = WaitForMultipleObjects(ARRAYSIZE(threads), threads, FALSE, 0);
 		if (ret != WAIT_TIMEOUT)
 		{
-			fprintf(stderr, "%s: WaitForMultipleObjects timeout 0 failed, ret=%d\n", __func__, ret);
+			(void)fprintf(stderr, "%s: WaitForMultipleObjects timeout 0 failed, ret=%d\n", __func__,
+			              ret);
 			goto fail;
 		}
 	}
 
 	if (WaitForMultipleObjects(ARRAYSIZE(threads), threads, TRUE, INFINITE) != WAIT_OBJECT_0)
 	{
-		fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
+		(void)fprintf(stderr, "%s: WaitForMultipleObjects bWaitAll, INFINITE failed\n", __func__);
 		goto fail;
 	}
 
@@ -200,7 +202,7 @@ static BOOL TestWaitOneTimeoutMultijoin(void)
 fail:
 	if (close_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: close_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: close_threads failed\n", __func__);
 		return FALSE;
 	}
 
@@ -214,7 +216,7 @@ static BOOL TestDetach(void)
 	/* WaitForAll, timeout */
 	if (start_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: start_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: start_threads failed\n", __func__);
 		goto fail;
 	}
 
@@ -222,7 +224,7 @@ static BOOL TestDetach(void)
 fail:
 	if (close_threads(ARRAYSIZE(threads), threads))
 	{
-		fprintf(stderr, "%s: close_threads failed\n", __func__);
+		(void)fprintf(stderr, "%s: close_threads failed\n", __func__);
 		return FALSE;
 	}