Prevent -Wstrict-prototypes and -Wold-style-definition warnings

A following commit will enable -Wstrict-prototypes and -Wold-style-definition
by default. This commit fixes the warnings that those new flags will generate
before actually adding the new flags.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/13d51b20-a69c-4ac1-8546-ec4fc278064f%40eisentraut.org

src/interfaces/ecpg/test/compat_informix/intoasc.pgc

@@ -8,7 +8,7 @@ EXEC SQL BEGIN DECLARE SECTION;
     interval *interval_ptr;
 EXEC SQL END DECLARE SECTION;
 
-int main()
+int main(void)
 {
     interval_ptr = (interval *) malloc(sizeof(interval));
     interval_ptr->time = 100000000;

src/interfaces/ecpg/test/compat_oracle/char_array.pgc

@@ -17,7 +17,7 @@ static void warn(void)
    should be fixed-length, blank-padded, then null-terminated.
    Conforms to the ANSI Fixed Character type. */
 
-int main() {
+int main(void) {
 
   EXEC SQL WHENEVER SQLWARNING do warn();
   EXEC SQL WHENEVER SQLERROR STOP;

src/interfaces/ecpg/test/expected/compat_informix-intoasc.c

@@ -27,7 +27,7 @@
 #line 9 "intoasc.pgc"
 
 
-int main()
+int main(void)
 {
     interval_ptr = (interval *) malloc(sizeof(interval));
     interval_ptr->time = 100000000;

src/interfaces/ecpg/test/expected/compat_oracle-char_array.c

@@ -57,7 +57,7 @@ static void warn(void)
    should be fixed-length, blank-padded, then null-terminated.
    Conforms to the ANSI Fixed Character type. */
 
-int main() {
+int main(void) {
 
   /* exec sql whenever sql_warning  do warn ( ) ; */
 #line 22 "char_array.pgc"

src/interfaces/ecpg/test/expected/preproc-array_of_struct.c

@@ -57,7 +57,7 @@ typedef  struct {
 #line 27 "array_of_struct.pgc"
 
 
-int main()
+int main(void)
 {
     /* exec sql begin declare section */
         

src/interfaces/ecpg/test/expected/preproc-autoprep.c

@@ -248,7 +248,7 @@ if (sqlca.sqlcode < 0) sqlprint();}
 
 }
 
-int main() {
+int main(void) {
   test();
   test();     /* retry */
 

src/interfaces/ecpg/test/expected/preproc-pointer_to_struct.c

@@ -58,7 +58,7 @@ typedef  struct {
 #line 28 "pointer_to_struct.pgc"
 
 
-int main()
+int main(void)
 {
     /* exec sql begin declare section */
               

src/interfaces/ecpg/test/expected/sql-code100.c

@@ -92,7 +92,7 @@ struct sqlca_t *ECPGget_sqlca(void);
 
 
 
-int main()
+int main(void)
 {  /* exec sql begin declare section */
     
    

src/interfaces/ecpg/test/expected/sql-copystdout.c

@@ -96,7 +96,7 @@ struct sqlca_t *ECPGget_sqlca(void);
 
 
 int
-main ()
+main(void)
 {
   ECPGdebug (1, stderr);
 

src/interfaces/ecpg/test/expected/sql-declare.c

@@ -578,7 +578,7 @@ if (sqlca.sqlcode < 0) sqlprint();}
     printf("count: %d, length: %d, data: %s\n", count, length, f3[0]);
 }
 
-void commitTable()
+void commitTable(void)
 {
     { ECPGtrans(__LINE__, "con1", "commit");
 #line 187 "declare.pgc"
@@ -597,7 +597,7 @@ if (sqlca.sqlcode < 0) sqlprint();}
 /*
  * reset all the output variables
  */
-void reset()
+void reset(void)
 {
     memset(f1, 0, sizeof(f1));
     memset(f2, 0, sizeof(f2));

src/interfaces/ecpg/test/expected/sql-dyntest.c

@@ -151,7 +151,7 @@ error (void)
 }
 
 int
-main ()
+main(void)
 {
   /* exec sql begin declare section */
    

src/interfaces/ecpg/test/expected/sql-fetch.c

@@ -22,7 +22,7 @@
 #line 5 "fetch.pgc"
 
 
-int main() {
+int main(void) {
   /* exec sql begin declare section */
      
        

src/interfaces/ecpg/test/expected/sql-func.c

@@ -22,7 +22,7 @@
 #line 5 "func.pgc"
 
 
-int main() {
+int main(void) {
   
 #line 8 "func.pgc"
  char text [ 25 ] ;

src/interfaces/ecpg/test/expected/sql-indicators.c

@@ -91,7 +91,7 @@ struct sqlca_t *ECPGget_sqlca(void);
 #line 4 "indicators.pgc"
 
 
-int main()
+int main(void)
 {
 	/* exec sql begin declare section */
 		   

src/interfaces/ecpg/test/expected/sql-insupd.c

@@ -22,7 +22,7 @@
 #line 5 "insupd.pgc"
 
 
-int main() {
+int main(void) {
   /* exec sql begin declare section */
 	    
   

src/interfaces/ecpg/test/expected/sql-parser.c

@@ -23,7 +23,7 @@
 #line 6 "parser.pgc"
 
 
-int main() {
+int main(void) {
   /* exec sql begin declare section */
 	   
   

src/interfaces/ecpg/test/expected/sql-quote.c

@@ -22,7 +22,7 @@
 #line 5 "quote.pgc"
 
 
-int main() {
+int main(void) {
   /* exec sql begin declare section */
      
       

src/interfaces/ecpg/test/expected/sql-show.c

@@ -22,7 +22,7 @@
 #line 5 "show.pgc"
 
 
-int main() {
+int main(void) {
   /* exec sql begin declare section */
        
   

src/interfaces/ecpg/test/expected/sql-sqljson.c

@@ -96,7 +96,7 @@ struct sqlca_t *ECPGget_sqlca(void);
 
 
 int
-main ()
+main(void)
 {
 /* exec sql begin declare section */
    

src/interfaces/ecpg/test/expected/sql-sqljson_jsontable.c

@@ -96,7 +96,7 @@ struct sqlca_t *ECPGget_sqlca(void);
 
 
 int
-main ()
+main(void)
 {
 /* exec sql begin declare section */
    

src/interfaces/ecpg/test/expected/thread-alloc.c

@@ -179,7 +179,7 @@ if (sqlca.sqlcode < 0) sqlprint();}
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	intptr_t i;
 #ifdef WIN32

src/interfaces/ecpg/test/expected/thread-descriptor.c

@@ -125,7 +125,7 @@ if (sqlca.sqlcode < 0) sqlprint();
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	int i;
 #ifdef WIN32

src/interfaces/ecpg/test/expected/thread-prep.c

@@ -189,7 +189,7 @@ if (sqlca.sqlcode < 0) sqlprint();}
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	intptr_t i;
 #ifdef WIN32

src/interfaces/ecpg/test/expected/thread-thread.c

@@ -38,7 +38,7 @@ void *test_thread(void *arg);
 int nthreads   = 10;
 int iterations = 20;
 
-int main()
+int main(void)
 {
 #ifndef WIN32
   pthread_t *threads;

src/interfaces/ecpg/test/expected/thread-thread_implicit.c

@@ -38,7 +38,7 @@ void *test_thread(void *arg);
 int nthreads   = 10;
 int iterations = 20;
 
-int main()
+int main(void)
 {
 #ifndef WIN32
   pthread_t *threads;

src/interfaces/ecpg/test/preproc/array_of_struct.pgc

@@ -26,7 +26,7 @@ EXEC SQL TYPE company IS
         customer customers[10];
     };
 
-int main()
+int main(void)
 {
     EXEC SQL begin declare section;
       customer  custs1[10];

src/interfaces/ecpg/test/preproc/autoprep.pgc

@@ -64,7 +64,7 @@ static void test(void) {
   EXEC SQL DISCONNECT ALL;
 }
 
-int main() {
+int main(void) {
   test();
   test();     /* retry */
 

src/interfaces/ecpg/test/preproc/pointer_to_struct.pgc

@@ -27,7 +27,7 @@ EXEC SQL TYPE company IS
         customer *customers;
     };
 
-int main()
+int main(void)
 {
     EXEC SQL begin declare section;
       customer  *custs1 = (customer *) malloc(sizeof(customer) * 10);

src/interfaces/ecpg/test/sql/code100.pgc

@@ -4,7 +4,7 @@ exec sql include sqlca;
 exec sql include ../regression;
 
 
-int main()
+int main(void)
 {  exec sql begin declare section;
    int index;
    exec sql end declare section;

src/interfaces/ecpg/test/sql/copystdout.pgc

@@ -6,7 +6,7 @@ exec sql include ../regression;
 EXEC SQL WHENEVER SQLERROR sqlprint;
 
 int
-main ()
+main(void)
 {
   ECPGdebug (1, stderr);
 

src/interfaces/ecpg/test/sql/declare.pgc

@@ -182,7 +182,7 @@ void execute_test(void)
     printf("count: %d, length: %d, data: %s\n", count, length, f3[0]);
 }
 
-void commitTable()
+void commitTable(void)
 {
     EXEC SQL AT con1 COMMIT;
     EXEC SQL AT con2 COMMIT;
@@ -191,7 +191,7 @@ void commitTable()
 /*
  * reset all the output variables
  */
-void reset()
+void reset(void)
 {
     memset(f1, 0, sizeof(f1));
     memset(f2, 0, sizeof(f2));

src/interfaces/ecpg/test/sql/dyntest.pgc

@@ -16,7 +16,7 @@ error (void)
 }
 
 int
-main ()
+main(void)
 {
   exec sql begin declare section;
   int COUNT;

src/interfaces/ecpg/test/sql/fetch.pgc

@@ -4,7 +4,7 @@
 
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL BEGIN DECLARE SECTION;
     char str[25];
     int i, count=1, loopcount;

src/interfaces/ecpg/test/sql/func.pgc

@@ -4,7 +4,7 @@
 
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL char text[25];
 
   ECPGdebug(1, stderr);

src/interfaces/ecpg/test/sql/indicators.pgc

@@ -3,7 +3,7 @@
 exec sql include sqlca;
 exec sql include ../regression;
 
-int main()
+int main(void)
 {
 	exec sql begin declare section;
 		int intvar = 5;

src/interfaces/ecpg/test/sql/insupd.pgc

@@ -4,7 +4,7 @@
 
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL BEGIN DECLARE SECTION;
 	int i1[3], i2[3], i3[3], i4;
   EXEC SQL END DECLARE SECTION;

src/interfaces/ecpg/test/sql/parser.pgc

@@ -5,7 +5,7 @@
 /* test parser addition that merges two tokens into one */
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL BEGIN DECLARE SECTION;
 	int item[3], ind[3], i;
   EXEC SQL END DECLARE SECTION;

src/interfaces/ecpg/test/sql/quote.pgc

@@ -4,7 +4,7 @@
 
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL BEGIN DECLARE SECTION;
     char var[25];
     int i, loopcount;

src/interfaces/ecpg/test/sql/show.pgc

@@ -4,7 +4,7 @@
 
 EXEC SQL INCLUDE ../regression;
 
-int main() {
+int main(void) {
   EXEC SQL BEGIN DECLARE SECTION;
     char var[25] = "public";
   EXEC SQL END DECLARE SECTION;

src/interfaces/ecpg/test/sql/sqljson.pgc

@@ -6,7 +6,7 @@ exec sql include ../regression;
 EXEC SQL WHENEVER SQLERROR sqlprint;
 
 int
-main ()
+main(void)
 {
 EXEC SQL BEGIN DECLARE SECTION;
   char json[1024];

src/interfaces/ecpg/test/sql/sqljson_jsontable.pgc

@@ -6,7 +6,7 @@ exec sql include ../regression;
 EXEC SQL WHENEVER SQLERROR sqlprint;
 
 int
-main ()
+main(void)
 {
 EXEC SQL BEGIN DECLARE SECTION;
   int foo;

src/interfaces/ecpg/test/thread/alloc.pgc

@@ -51,7 +51,7 @@ static void* fn(void* arg)
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	intptr_t i;
 #ifdef WIN32

src/interfaces/ecpg/test/thread/descriptor.pgc

@@ -32,7 +32,7 @@ static void* fn(void* arg)
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	int i;
 #ifdef WIN32

src/interfaces/ecpg/test/thread/prep.pgc

@@ -51,7 +51,7 @@ static void* fn(void* arg)
 	return 0;
 }
 
-int main ()
+int main(void)
 {
 	intptr_t i;
 #ifdef WIN32

src/interfaces/ecpg/test/thread/thread.pgc

@@ -20,7 +20,7 @@ void *test_thread(void *arg);
 int nthreads   = 10;
 int iterations = 20;
 
-int main()
+int main(void)
 {
 #ifndef WIN32
   pthread_t *threads;

src/interfaces/ecpg/test/thread/thread_implicit.pgc

@@ -20,7 +20,7 @@ void *test_thread(void *arg);
 int nthreads   = 10;
 int iterations = 20;
 
-int main()
+int main(void)
 {
 #ifndef WIN32
   pthread_t *threads;

src/interfaces/libpq/test/libpq_testclient.c

@@ -13,7 +13,7 @@
 #include "libpq-fe.h"
 
 static void
-print_ssl_library()
+print_ssl_library(void)
 {
 	const char *lib = PQsslAttribute(NULL, "library");