eal/windows: fix warnings

Fixed bunch of warnings when compiling using clang on Windows
such as the use of an unsafe string function (strerror),
[-Wunused-variable], [-Wunused-function] in eal_common_options.c
[-Wunused-const-variable] in getopt.c and [-Wunused-parameter]
in eal_common_thread.c.
Also fixed warnings generated using Mingw:
[-Werror=old-style-definition], [-Werror=cast-function-type] and
[-Werror=attributes]

Signed-off-by: Ranjit Menon <ranjit.menon@intel.com>
Signed-off-by: Pallavi Kadam <pallavi.kadam@intel.com>
Tested-by: Narcisa Vasile <navasile@linux.microsoft.com>
Acked-by: Narcisa Vasile <navasile@linux.microsoft.com>

lib/librte_eal/common/eal_common_options.c

@@ -18,7 +18,9 @@
 #endif
 #include <sys/types.h>
 #include <sys/stat.h>
+#ifndef RTE_EXEC_ENV_WINDOWS
 #include <dirent.h>
+#endif
 
 #include <rte_string_fns.h>
 #include <rte_eal.h>
@@ -115,8 +117,10 @@ struct shared_driver {
 static struct shared_driver_list solib_list =
 TAILQ_HEAD_INITIALIZER(solib_list);
 
+#ifndef RTE_EXEC_ENV_WINDOWS
 /* Default path of external loadable drivers */
 static const char *default_solib_dir = RTE_EAL_PMD_PATH;
+#endif
 
 /*
  * Stringified version of solib path used by dpdk-pmdinfo.py
@@ -329,6 +333,7 @@ eal_plugin_add(const char *path)
 	return 0;
 }
 
+#ifndef RTE_EXEC_ENV_WINDOWS
 static int
 eal_plugindir_init(const char *path)
 {
@@ -362,6 +367,7 @@ eal_plugindir_init(const char *path)
 	/* XXX this ignores failures from readdir() itself */
 	return (dent == NULL) ? 0 : -1;
 }
+#endif
 
 int
 eal_plugins_init(void)
@@ -394,8 +400,8 @@ eal_plugins_init(void)
 		}
 
 	}
-	return 0;
 #endif
+	return 0;
 }
 
 /*

lib/librte_eal/windows/eal.c

@@ -139,7 +139,7 @@ eal_log_level_parse(int argc, char **argv)
 }
 
 /* Parse the argument given in the command line of the application */
-__attribute__((optnone)) static int
+static int
 eal_parse_args(int argc, char **argv)
 {
 	int opt, ret;

lib/librte_eal/windows/eal_lcore.c

@@ -27,7 +27,7 @@ static struct _wcpu_map {
  * Create a map of all processors and associated cores on the system
  */
 void
-eal_create_cpu_map()
+eal_create_cpu_map(void)
 {
 	wcpu_map.total_procs =
 		GetActiveProcessorCount(ALL_PROCESSOR_GROUPS);

lib/librte_eal/windows/eal_thread.c

@@ -140,7 +140,8 @@ eal_thread_create(pthread_t *thread)
 {
 	HANDLE th;
 
-	th = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)eal_thread_loop,
+	th = CreateThread(NULL, 0,
+		(LPTHREAD_START_ROUTINE)(ULONG_PTR)eal_thread_loop,
 						NULL, 0, (LPDWORD)thread);
 	if (!th)
 		return -1;

lib/librte_eal/windows/getopt.c

@@ -25,8 +25,8 @@ int	opterr = 1;		/* if error message should be printed */
 int	optind = 1;		/* index into parent argv vector */
 int	optopt = '?';		/* character checked for validity */
 
-static void pass(void) {}
-#define warnx(a, ...) pass()
+static void pass(const char *a) {(void) a; }
+#define warnx(a, ...) pass(a)
 
 #define PRINT_ERROR	((opterr) && (*options != ':'))
 

lib/librte_eal/windows/include/pthread.h

@@ -45,7 +45,7 @@ typedef SYNCHRONIZATION_BARRIER pthread_barrier_t;
 #define pthread_getaffinity_np(thread, size, cpuset) \
 	eal_get_thread_affinity_mask(thread, (unsigned long *) cpuset)
 #define pthread_create(threadid, threadattr, threadfunc, args) \
-	eal_create_thread(threadid, threadfunc, args)
+	eal_create_thread(threadid, threadattr, threadfunc, args)
 
 static inline int
 eal_set_thread_affinity_mask(pthread_t threadid, unsigned long *cpuset)
@@ -70,8 +70,10 @@ eal_get_thread_affinity_mask(pthread_t threadid, unsigned long *cpuset)
 }
 
 static inline int
-eal_create_thread(void *threadid, void *threadfunc, void *args)
+eal_create_thread(void *threadid, const void *threadattr, void *threadfunc,
+		void *args)
 {
+	RTE_SET_USED(threadattr);
 	HANDLE hThread;
 	hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)threadfunc,
 		args, 0, (LPDWORD)threadid);