Fix compiler error introduced on revision 3937, make sure that stackdump is...

Fix compiler error introduced on revision 3937, make sure that stackdump is compiled only on __linux__.

storage/xtradb/os/os0stacktrace.c

@@ -19,7 +19,7 @@ this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "os0thread.h"
 
-#ifndef __WIN__
+#ifdef __linux__
 
 #include <execinfo.h>
 #include <signal.h>
@@ -34,6 +34,9 @@ this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef __USE_GNU
 #define __USE_GNU
 #endif
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE
+#endif
 
 /* Since kernel version 2.2 the undocumented parameter to the signal handler has been declared
 obsolete in adherence with POSIX.1b. A more correct way to retrieve additional information is
@@ -122,4 +125,4 @@ os_stacktrace_print(
 	free(messages);
 }
 
-#endif /* ! __WIN__ */
+#endif /* __linux__ */

storage/xtradb/srv/srv0start.c

@@ -1261,7 +1261,7 @@ innobase_start_or_create_for_mysql(void)
 	stacktrace feature. */
 
 	if (srv_use_stacktrace) {
-#ifndef __WIN__
+#ifdef __linux__
 		 struct sigaction sigact;
 
 		 sigact.sa_sigaction = os_stacktrace_print;
@@ -1274,7 +1274,7 @@ innobase_start_or_create_for_mysql(void)
 			 srv_use_stacktrace = FALSE;
 
 		 }
-#endif /*! __WIN__ */
+#endif /* __linux__ */
 	}
 
 

storage/xtradb/sync/sync0arr.c

@@ -487,7 +487,7 @@ sync_array_cell_print(
 	signal to thread waiting for the semaphore. Signal handler
 	will then dump the current stack to error log. */
 	if (srv_use_stacktrace) {
-#ifndef __WIN__
+#ifdef __linux__
 		pthread_kill(cell->thread, SIGUSR2);
 #endif
 	}
@@ -551,7 +551,7 @@ sync_array_cell_print(
 		signal to thread that has locked RW-latch with write mode.
 		Signal handler will then dump the current stack to error log. */
 		if (writer != RW_LOCK_NOT_LOCKED && srv_use_stacktrace) {
-#ifndef __WIN__
+#ifdef __linux__
 			pthread_kill(rwlock->writer_thread, SIGUSR2);
 #endif
 		}