From 8c44c5be1a68c0b2a35ac318f66c294afb6eda34 Mon Sep 17 00:00:00 2001
From: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Date: Mon, 9 Mar 2026 09:57:02 +0000
Subject: [PATCH v1 1/2] 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          | 2 +-
 src/interfaces/ecpg/test/compat_oracle/char_array.pgc         | 2 +-
 src/interfaces/ecpg/test/expected/compat_informix-intoasc.c   | 2 +-
 src/interfaces/ecpg/test/expected/compat_oracle-char_array.c  | 2 +-
 src/interfaces/ecpg/test/expected/preproc-array_of_struct.c   | 2 +-
 src/interfaces/ecpg/test/expected/preproc-autoprep.c          | 2 +-
 src/interfaces/ecpg/test/expected/preproc-pointer_to_struct.c | 2 +-
 src/interfaces/ecpg/test/expected/sql-code100.c               | 2 +-
 src/interfaces/ecpg/test/expected/sql-copystdout.c            | 2 +-
 src/interfaces/ecpg/test/expected/sql-declare.c               | 4 ++--
 src/interfaces/ecpg/test/expected/sql-dyntest.c               | 2 +-
 src/interfaces/ecpg/test/expected/sql-fetch.c                 | 2 +-
 src/interfaces/ecpg/test/expected/sql-func.c                  | 2 +-
 src/interfaces/ecpg/test/expected/sql-indicators.c            | 2 +-
 src/interfaces/ecpg/test/expected/sql-insupd.c                | 2 +-
 src/interfaces/ecpg/test/expected/sql-parser.c                | 2 +-
 src/interfaces/ecpg/test/expected/sql-quote.c                 | 2 +-
 src/interfaces/ecpg/test/expected/sql-show.c                  | 2 +-
 src/interfaces/ecpg/test/expected/sql-sqljson.c               | 2 +-
 src/interfaces/ecpg/test/expected/sql-sqljson_jsontable.c     | 2 +-
 src/interfaces/ecpg/test/expected/thread-alloc.c              | 2 +-
 src/interfaces/ecpg/test/expected/thread-descriptor.c         | 2 +-
 src/interfaces/ecpg/test/expected/thread-prep.c               | 2 +-
 src/interfaces/ecpg/test/expected/thread-thread.c             | 2 +-
 src/interfaces/ecpg/test/expected/thread-thread_implicit.c    | 2 +-
 src/interfaces/ecpg/test/preproc/array_of_struct.pgc          | 2 +-
 src/interfaces/ecpg/test/preproc/autoprep.pgc                 | 2 +-
 src/interfaces/ecpg/test/preproc/pointer_to_struct.pgc        | 2 +-
 src/interfaces/ecpg/test/sql/code100.pgc                      | 2 +-
 src/interfaces/ecpg/test/sql/copystdout.pgc                   | 2 +-
 src/interfaces/ecpg/test/sql/declare.pgc                      | 4 ++--
 src/interfaces/ecpg/test/sql/dyntest.pgc                      | 2 +-
 src/interfaces/ecpg/test/sql/fetch.pgc                        | 2 +-
 src/interfaces/ecpg/test/sql/func.pgc                         | 2 +-
 src/interfaces/ecpg/test/sql/indicators.pgc                   | 2 +-
 src/interfaces/ecpg/test/sql/insupd.pgc                       | 2 +-
 src/interfaces/ecpg/test/sql/parser.pgc                       | 2 +-
 src/interfaces/ecpg/test/sql/quote.pgc                        | 2 +-
 src/interfaces/ecpg/test/sql/show.pgc                         | 2 +-
 src/interfaces/ecpg/test/sql/sqljson.pgc                      | 2 +-
 src/interfaces/ecpg/test/sql/sqljson_jsontable.pgc            | 2 +-
 src/interfaces/ecpg/test/thread/alloc.pgc                     | 2 +-
 src/interfaces/ecpg/test/thread/descriptor.pgc                | 2 +-
 src/interfaces/ecpg/test/thread/prep.pgc                      | 2 +-
 src/interfaces/ecpg/test/thread/thread.pgc                    | 2 +-
 src/interfaces/ecpg/test/thread/thread_implicit.pgc           | 2 +-
 src/interfaces/libpq/test/libpq_testclient.c                  | 2 +-
 47 files changed, 49 insertions(+), 49 deletions(-)
  48.3% src/interfaces/ecpg/test/expected/
   6.0% src/interfaces/ecpg/test/preproc/
  28.2% src/interfaces/ecpg/test/sql/
   9.8% src/interfaces/ecpg/test/thread/
   4.1% src/interfaces/ecpg/test/
   3.2% src/interfaces/libpq/test/

diff --git a/src/interfaces/ecpg/test/compat_informix/intoasc.pgc b/src/interfaces/ecpg/test/compat_informix/intoasc.pgc
index d13c83bb7a7..cf8b342ab4c 100644
--- a/src/interfaces/ecpg/test/compat_informix/intoasc.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/compat_oracle/char_array.pgc b/src/interfaces/ecpg/test/compat_oracle/char_array.pgc
index de18cbb57ff..303fe02aa27 100644
--- a/src/interfaces/ecpg/test/compat_oracle/char_array.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/expected/compat_informix-intoasc.c b/src/interfaces/ecpg/test/expected/compat_informix-intoasc.c
index 30988809e92..56b927c6aae 100644
--- a/src/interfaces/ecpg/test/expected/compat_informix-intoasc.c
+++ b/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;
diff --git a/src/interfaces/ecpg/test/expected/compat_oracle-char_array.c b/src/interfaces/ecpg/test/expected/compat_oracle-char_array.c
index 16db663dcc5..2daedb546c2 100644
--- a/src/interfaces/ecpg/test/expected/compat_oracle-char_array.c
+++ b/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"
diff --git a/src/interfaces/ecpg/test/expected/preproc-array_of_struct.c b/src/interfaces/ecpg/test/expected/preproc-array_of_struct.c
index bbe904fa106..31349aa5509 100644
--- a/src/interfaces/ecpg/test/expected/preproc-array_of_struct.c
+++ b/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 */
         
diff --git a/src/interfaces/ecpg/test/expected/preproc-autoprep.c b/src/interfaces/ecpg/test/expected/preproc-autoprep.c
index 8ed5a2ca2c1..9f811c200a9 100644
--- a/src/interfaces/ecpg/test/expected/preproc-autoprep.c
+++ b/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 */
 
diff --git a/src/interfaces/ecpg/test/expected/preproc-pointer_to_struct.c b/src/interfaces/ecpg/test/expected/preproc-pointer_to_struct.c
index e59ace24f12..aa72604051f 100644
--- a/src/interfaces/ecpg/test/expected/preproc-pointer_to_struct.c
+++ b/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 */
               
diff --git a/src/interfaces/ecpg/test/expected/sql-code100.c b/src/interfaces/ecpg/test/expected/sql-code100.c
index 4c85530a17a..f05a9540b0e 100644
--- a/src/interfaces/ecpg/test/expected/sql-code100.c
+++ b/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 */
     
    
diff --git a/src/interfaces/ecpg/test/expected/sql-copystdout.c b/src/interfaces/ecpg/test/expected/sql-copystdout.c
index d2599fb0e93..f875036f478 100644
--- a/src/interfaces/ecpg/test/expected/sql-copystdout.c
+++ b/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);
 
diff --git a/src/interfaces/ecpg/test/expected/sql-declare.c b/src/interfaces/ecpg/test/expected/sql-declare.c
index 6248d992175..2a59313bf46 100644
--- a/src/interfaces/ecpg/test/expected/sql-declare.c
+++ b/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));
diff --git a/src/interfaces/ecpg/test/expected/sql-dyntest.c b/src/interfaces/ecpg/test/expected/sql-dyntest.c
index 513d44c6304..8eccfbfc1b5 100644
--- a/src/interfaces/ecpg/test/expected/sql-dyntest.c
+++ b/src/interfaces/ecpg/test/expected/sql-dyntest.c
@@ -151,7 +151,7 @@ error (void)
 }
 
 int
-main ()
+main(void)
 {
   /* exec sql begin declare section */
    
diff --git a/src/interfaces/ecpg/test/expected/sql-fetch.c b/src/interfaces/ecpg/test/expected/sql-fetch.c
index ca7d14e97c4..0aea4a9192a 100644
--- a/src/interfaces/ecpg/test/expected/sql-fetch.c
+++ b/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 */
      
        
diff --git a/src/interfaces/ecpg/test/expected/sql-func.c b/src/interfaces/ecpg/test/expected/sql-func.c
index 17c5d26ea41..fa590bd16ca 100644
--- a/src/interfaces/ecpg/test/expected/sql-func.c
+++ b/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 ] ;
diff --git a/src/interfaces/ecpg/test/expected/sql-indicators.c b/src/interfaces/ecpg/test/expected/sql-indicators.c
index 7cf43ad6228..796bd906af6 100644
--- a/src/interfaces/ecpg/test/expected/sql-indicators.c
+++ b/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 */
 		   
diff --git a/src/interfaces/ecpg/test/expected/sql-insupd.c b/src/interfaces/ecpg/test/expected/sql-insupd.c
index 5f73bf566ff..dde2bdc9688 100644
--- a/src/interfaces/ecpg/test/expected/sql-insupd.c
+++ b/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 */
 	    
   
diff --git a/src/interfaces/ecpg/test/expected/sql-parser.c b/src/interfaces/ecpg/test/expected/sql-parser.c
index 32bb2c21260..ba53ab03309 100644
--- a/src/interfaces/ecpg/test/expected/sql-parser.c
+++ b/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 */
 	   
   
diff --git a/src/interfaces/ecpg/test/expected/sql-quote.c b/src/interfaces/ecpg/test/expected/sql-quote.c
index ddc1e90b1c3..3001df4069f 100644
--- a/src/interfaces/ecpg/test/expected/sql-quote.c
+++ b/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 */
      
       
diff --git a/src/interfaces/ecpg/test/expected/sql-show.c b/src/interfaces/ecpg/test/expected/sql-show.c
index f934dc99feb..f4add407439 100644
--- a/src/interfaces/ecpg/test/expected/sql-show.c
+++ b/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 */
        
   
diff --git a/src/interfaces/ecpg/test/expected/sql-sqljson.c b/src/interfaces/ecpg/test/expected/sql-sqljson.c
index 39221f9ea5d..be7fbe19e13 100644
--- a/src/interfaces/ecpg/test/expected/sql-sqljson.c
+++ b/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 */
    
diff --git a/src/interfaces/ecpg/test/expected/sql-sqljson_jsontable.c b/src/interfaces/ecpg/test/expected/sql-sqljson_jsontable.c
index b2a0f11eb6e..cbbc99539cb 100644
--- a/src/interfaces/ecpg/test/expected/sql-sqljson_jsontable.c
+++ b/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 */
    
diff --git a/src/interfaces/ecpg/test/expected/thread-alloc.c b/src/interfaces/ecpg/test/expected/thread-alloc.c
index 3b31d27fd34..912d94c134c 100644
--- a/src/interfaces/ecpg/test/expected/thread-alloc.c
+++ b/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
diff --git a/src/interfaces/ecpg/test/expected/thread-descriptor.c b/src/interfaces/ecpg/test/expected/thread-descriptor.c
index e34f4708d13..f9322b3e9bb 100644
--- a/src/interfaces/ecpg/test/expected/thread-descriptor.c
+++ b/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
diff --git a/src/interfaces/ecpg/test/expected/thread-prep.c b/src/interfaces/ecpg/test/expected/thread-prep.c
index 052e27b634f..4fb19e3fd1c 100644
--- a/src/interfaces/ecpg/test/expected/thread-prep.c
+++ b/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
diff --git a/src/interfaces/ecpg/test/expected/thread-thread.c b/src/interfaces/ecpg/test/expected/thread-thread.c
index 95faa223c20..71da6f2e07d 100644
--- a/src/interfaces/ecpg/test/expected/thread-thread.c
+++ b/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;
diff --git a/src/interfaces/ecpg/test/expected/thread-thread_implicit.c b/src/interfaces/ecpg/test/expected/thread-thread_implicit.c
index 7ac0297a234..259fc09dad6 100644
--- a/src/interfaces/ecpg/test/expected/thread-thread_implicit.c
+++ b/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;
diff --git a/src/interfaces/ecpg/test/preproc/array_of_struct.pgc b/src/interfaces/ecpg/test/preproc/array_of_struct.pgc
index dff9f9a7471..7cc76075536 100644
--- a/src/interfaces/ecpg/test/preproc/array_of_struct.pgc
+++ b/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];
diff --git a/src/interfaces/ecpg/test/preproc/autoprep.pgc b/src/interfaces/ecpg/test/preproc/autoprep.pgc
index d3d9305da5b..6da232d59ab 100644
--- a/src/interfaces/ecpg/test/preproc/autoprep.pgc
+++ b/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 */
 
diff --git a/src/interfaces/ecpg/test/preproc/pointer_to_struct.pgc b/src/interfaces/ecpg/test/preproc/pointer_to_struct.pgc
index 6003f0fa183..46404373ce6 100644
--- a/src/interfaces/ecpg/test/preproc/pointer_to_struct.pgc
+++ b/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);
diff --git a/src/interfaces/ecpg/test/sql/code100.pgc b/src/interfaces/ecpg/test/sql/code100.pgc
index d9a5e52444a..8b29b0a9d2c 100644
--- a/src/interfaces/ecpg/test/sql/code100.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/copystdout.pgc b/src/interfaces/ecpg/test/sql/copystdout.pgc
index 9ecce7d42c2..f385a86f2ad 100644
--- a/src/interfaces/ecpg/test/sql/copystdout.pgc
+++ b/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);
 
diff --git a/src/interfaces/ecpg/test/sql/declare.pgc b/src/interfaces/ecpg/test/sql/declare.pgc
index e7ee4aa5348..4dfe1dd8bd3 100644
--- a/src/interfaces/ecpg/test/sql/declare.pgc
+++ b/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));
diff --git a/src/interfaces/ecpg/test/sql/dyntest.pgc b/src/interfaces/ecpg/test/sql/dyntest.pgc
index 0222c898515..f7cc7293323 100644
--- a/src/interfaces/ecpg/test/sql/dyntest.pgc
+++ b/src/interfaces/ecpg/test/sql/dyntest.pgc
@@ -16,7 +16,7 @@ error (void)
 }
 
 int
-main ()
+main(void)
 {
   exec sql begin declare section;
   int COUNT;
diff --git a/src/interfaces/ecpg/test/sql/fetch.pgc b/src/interfaces/ecpg/test/sql/fetch.pgc
index 31e525e42d4..6367cdb8727 100644
--- a/src/interfaces/ecpg/test/sql/fetch.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/func.pgc b/src/interfaces/ecpg/test/sql/func.pgc
index 5ebcafa11da..fcc2632c3de 100644
--- a/src/interfaces/ecpg/test/sql/func.pgc
+++ b/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);
diff --git a/src/interfaces/ecpg/test/sql/indicators.pgc b/src/interfaces/ecpg/test/sql/indicators.pgc
index c1f26e33adc..d925faf35ce 100644
--- a/src/interfaces/ecpg/test/sql/indicators.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/insupd.pgc b/src/interfaces/ecpg/test/sql/insupd.pgc
index b12f66f791a..50dac5e5f1f 100644
--- a/src/interfaces/ecpg/test/sql/insupd.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/parser.pgc b/src/interfaces/ecpg/test/sql/parser.pgc
index 6e15f1364d5..ab2655b755c 100644
--- a/src/interfaces/ecpg/test/sql/parser.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/quote.pgc b/src/interfaces/ecpg/test/sql/quote.pgc
index 5cf4833d053..da42aab056d 100644
--- a/src/interfaces/ecpg/test/sql/quote.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/show.pgc b/src/interfaces/ecpg/test/sql/show.pgc
index 232b3e77348..b1318453058 100644
--- a/src/interfaces/ecpg/test/sql/show.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/sql/sqljson.pgc b/src/interfaces/ecpg/test/sql/sqljson.pgc
index ddcbcc3b3cb..6cc8a375dd5 100644
--- a/src/interfaces/ecpg/test/sql/sqljson.pgc
+++ b/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];
diff --git a/src/interfaces/ecpg/test/sql/sqljson_jsontable.pgc b/src/interfaces/ecpg/test/sql/sqljson_jsontable.pgc
index aa2b4494bb6..3e9a110944d 100644
--- a/src/interfaces/ecpg/test/sql/sqljson_jsontable.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/thread/alloc.pgc b/src/interfaces/ecpg/test/thread/alloc.pgc
index d3d35493bf9..39faa6dc2ef 100644
--- a/src/interfaces/ecpg/test/thread/alloc.pgc
+++ b/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
diff --git a/src/interfaces/ecpg/test/thread/descriptor.pgc b/src/interfaces/ecpg/test/thread/descriptor.pgc
index 30bce7c87bc..b1485ac2a5c 100644
--- a/src/interfaces/ecpg/test/thread/descriptor.pgc
+++ b/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
diff --git a/src/interfaces/ecpg/test/thread/prep.pgc b/src/interfaces/ecpg/test/thread/prep.pgc
index f61b31ce101..a389a6ae39e 100644
--- a/src/interfaces/ecpg/test/thread/prep.pgc
+++ b/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
diff --git a/src/interfaces/ecpg/test/thread/thread.pgc b/src/interfaces/ecpg/test/thread/thread.pgc
index b9b9ebb441d..36ff91fe816 100644
--- a/src/interfaces/ecpg/test/thread/thread.pgc
+++ b/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;
diff --git a/src/interfaces/ecpg/test/thread/thread_implicit.pgc b/src/interfaces/ecpg/test/thread/thread_implicit.pgc
index ff9b12a9437..711a8e26cc6 100644
--- a/src/interfaces/ecpg/test/thread/thread_implicit.pgc
+++ b/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;
diff --git a/src/interfaces/libpq/test/libpq_testclient.c b/src/interfaces/libpq/test/libpq_testclient.c
index e552c09d36d..20730709ee7 100644
--- a/src/interfaces/libpq/test/libpq_testclient.c
+++ b/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");
 
-- 
2.34.1