Remove testsuite compile errors with GCC5.

GCC5 defaults to the GNU11 standard for C and warns by default for
implicit function declarations and implicit return types.
https://gcc.gnu.org/gcc-5/porting_to.html

Fixing these issues in the testsuite turns 9 untested and 17 unsupported
testcases into 417 new passes when compiling with GCC5.

gdb/testsuite/ChangeLog:

        * gdb.arch/i386-bp_permanent.c (standard): New declaration.
        * gdb.base/disp-step-fork.c: Include unistd.h.
        * gdb.base/siginfo-obj.c: Include stdio.h.
        * gdb.base/siginfo-thread.c: Likewise.
        * gdb.mi/non-stop.c: Include unistd.h.
        * gdb.mi/nsthrexec.c: Include stdio.h.
        * gdb.mi/pthreads.c: Include unistd.h.
        * gdb.modula2/unbounded1.c (main): Declare returns int.
        * gdb.reverse/consecutive-reverse.c: Likewise.
        * gdb.threads/create-fail.c: Include unistd.h.
        * gdb.threads/killed.c: Likewise.
        * gdb.threads/linux-dp.c: Likewise.
        * gdb.threads/non-ldr-exc-1.c: Include stdio.h and string.h.
        * gdb.threads/non-ldr-exc-2.c: Likewise.
        * gdb.threads/non-ldr-exc-3.c: Likewise.
        * gdb.threads/non-ldr-exc-4.c: Likewise.
        * gdb.threads/pthreads.c: Include unistd.h.
        (main): Declare returns int.
        * gdb.threads/tls-main.c (foo): New declaration.
        * gdb.threads/watchpoint-fork-mt.c: Define _GNU_SOURCE.

gdb/testsuite/ChangeLog

@@ -1,3 +1,26 @@
+2015-01-25  Mark Wielaard  <mjw@redhat.com>
+
+	* gdb.arch/i386-bp_permanent.c (standard): New declaration.
+	* gdb.base/disp-step-fork.c: Include unistd.h.
+	* gdb.base/siginfo-obj.c: Include stdio.h.
+	* gdb.base/siginfo-thread.c: Likewise.
+	* gdb.mi/non-stop.c: Include unistd.h.
+	* gdb.mi/nsthrexec.c: Include stdio.h.
+	* gdb.mi/pthreads.c: Include unistd.h.
+	* gdb.modula2/unbounded1.c (main): Declare returns int.
+	* gdb.reverse/consecutive-reverse.c: Likewise.
+	* gdb.threads/create-fail.c: Include unistd.h.
+	* gdb.threads/killed.c: Likewise.
+	* gdb.threads/linux-dp.c: Likewise.
+	* gdb.threads/non-ldr-exc-1.c: Include stdio.h and string.h.
+	* gdb.threads/non-ldr-exc-2.c: Likewise.
+	* gdb.threads/non-ldr-exc-3.c: Likewise.
+	* gdb.threads/non-ldr-exc-4.c: Likewise.
+	* gdb.threads/pthreads.c: Include unistd.h.
+	(main): Declare returns int.
+	* gdb.threads/tls-main.c (foo): New declaration.
+	* gdb.threads/watchpoint-fork-mt.c: Define _GNU_SOURCE.
+
 2015-01-23  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* gdb.mi/mi-var-list-children-invalid-grandchild.c: New file.

gdb/testsuite/gdb.arch/i386-bp_permanent.c

@@ -21,6 +21,8 @@
 #define SYMBOL(str)	#str
 #endif
 
+void standard (void);
+
 int
 main (void)
 {

gdb/testsuite/gdb.base/disp-step-fork.c

@@ -16,6 +16,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <stdlib.h>
+#include <unistd.h>
 
 static void
 marker () {}

gdb/testsuite/gdb.base/siginfo-obj.c

@@ -19,6 +19,7 @@
 
 #include <signal.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>

gdb/testsuite/gdb.base/siginfo-thread.c

@@ -19,6 +19,7 @@
 
 #include <signal.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>

gdb/testsuite/gdb.mi/non-stop.c

@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <unistd.h>
 
 /* Under HPUX 10, the second arg of pthread_create
    is prototyped to be just a "pthread_attr_t", while under Solaris it

gdb/testsuite/gdb.mi/nsthrexec.c

@@ -18,6 +18,7 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <stdio.h>
 
 static const char *image;
 

gdb/testsuite/gdb.mi/pthreads.c

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <unistd.h>
 
 /* Under HPUX 10, the second arg of pthread_create
    is prototyped to be just a "pthread_attr_t", while under Solaris it

gdb/testsuite/gdb.modula2/unbounded1.c

@@ -30,7 +30,7 @@ foo (unbounded a)
     return 1;
 }
 
-
+int
 main ()
 {
   unbounded t;

gdb/testsuite/gdb.reverse/consecutive-reverse.c

@@ -27,6 +27,7 @@ int foo ()
   return a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6];
 }
 
+int
 main()
 {
   foo ();

gdb/testsuite/gdb.threads/create-fail.c

@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <dirent.h>
 #include <assert.h>
+#include <unistd.h>
 
 /* Count the number of tasks/threads in the PID thread group.  */
 

gdb/testsuite/gdb.threads/killed.c

@@ -20,6 +20,7 @@
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 int pid;
 

gdb/testsuite/gdb.threads/linux-dp.c

@@ -11,6 +11,7 @@
 #include <pthread.h>
 #include <sys/time.h>
 #include <sys/types.h>
+#include <unistd.h>
 
 /* The number of philosophers at the table.  */
 int num_philosophers;

gdb/testsuite/gdb.threads/non-ldr-exc-1.c

@@ -18,6 +18,8 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 static const char *image;

gdb/testsuite/gdb.threads/non-ldr-exc-2.c

@@ -18,6 +18,8 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 static const char *image;

gdb/testsuite/gdb.threads/non-ldr-exc-3.c

@@ -18,6 +18,8 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 static const char *image;

gdb/testsuite/gdb.threads/non-ldr-exc-4.c

@@ -18,6 +18,8 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 static const char *image;

gdb/testsuite/gdb.threads/pthread_cond_wait.c

@@ -20,6 +20,7 @@
 #include <pthread.h>
 #include <stdio.h>
 #include <time.h>
+#include <unistd.h>
 
 void
 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)

gdb/testsuite/gdb.threads/pthreads.c

@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <unistd.h>
 
 /* Under HPUX 10, the second arg of pthread_create
    is prototyped to be just a "pthread_attr_t", while under Solaris it
@@ -110,6 +111,7 @@ foo (a, b, c)
   if (verbose) printf("a=%d\n", a);
 }
 
+int
 main(argc, argv)
      int argc;
      char **argv;

gdb/testsuite/gdb.threads/tls-main.c

@@ -1,3 +1,4 @@
+int foo (void);
 __thread int i_tls = 2;
 int main ()
 {

gdb/testsuite/gdb.threads/watchpoint-fork-mt.c

@@ -22,6 +22,9 @@
 #include <sys/wait.h>
 #include <stdio.h>
 #include <stdlib.h>
+
+/* pthread_yield is a GNU extension.  */
+#define _GNU_SOURCE
 #include <pthread.h>
 
 #include <asm/unistd.h>