diff --git a/cobc/cobc.c b/cobc/cobc.c
index eccae779b..3b2eeae4a 100644
--- a/cobc/cobc.c
+++ b/cobc/cobc.c
@@ -442,7 +442,7 @@ static size_t		manilink_len;
 #endif
 
 static size_t		strip_output = 0;
-static size_t		source_debugging = 0;
+static size_t		cb_source_debugging = 0;	/* note: was moved to global one later, so keep that name already*/
 
 static const char	*const cob_csyns[] = {
 #ifndef	COB_EBCDIC_MACHINE
@@ -3107,7 +3107,7 @@ process_command_line (const int argc, char **argv)
 		case 'g':
 			/* -g : Generate C debug code */
 			save_all_src = 1;
-			source_debugging = 1;
+			cb_source_debugging = 1;
 			cb_flag_stack_check = 1;
 			cb_flag_source_location = 1;
 #if 1		/* auto-included, may be disabled manually if needed */
@@ -3902,7 +3902,7 @@ process_command_line (const int argc, char **argv)
 	}
 
 	/* If C debug, do not strip output */
-	if (source_debugging) {
+	if (cb_source_debugging) {
 		strip_output = 0;
 	}
 
@@ -4653,7 +4653,7 @@ process (char *cmd)
 		if (optimize) {
 			strcat (buffptr, " OPTIMIZE(40)");
 		}
-		if (source_debugging) {
+		if (cb_source_debugging) {
 			strcat (buffptr, " DBGVIEW(*ALL)");
 		}
 		if (cobc_gen_listing) {
@@ -7745,7 +7745,7 @@ process_compile (struct filename *fn)
 	cobc_chk_buff_size (bufflen);
 
 #ifdef	_MSC_VER
-	sprintf (cobc_buffer, source_debugging ?
+	sprintf (cobc_buffer, cb_source_debugging ?
 		"%s /c %s %s /Od /MDd /Zi /FR /c /Fa\"%s\" /Fo\"%s\" \"%s\"" :
 		"%s /c %s %s     /MD          /c /Fa\"%s\" /Fo\"%s\" \"%s\"",
 			cobc_cc, cobc_cflags, cobc_include, name,
@@ -7795,7 +7795,7 @@ process_assemble (struct filename *fn)
 	cobc_chk_buff_size (bufflen);
 
 #ifdef	_MSC_VER
-	sprintf (cobc_buffer, source_debugging ?
+	sprintf (cobc_buffer, cb_source_debugging ?
 		"%s /c %s %s /Od /MDd /Zi /FR /Fo\"%s\" \"%s\"" :
 		"%s /c %s %s     /MD          /Fo\"%s\" \"%s\"",
 			cobc_cc, cobc_cflags, cobc_include,
diff --git a/cobc/reserved.c b/cobc/reserved.c
index c17c8a0d9..f6eb0e42e 100644
--- a/cobc/reserved.c
+++ b/cobc/reserved.c
@@ -4737,6 +4737,7 @@ add_reserved_word (const char *word, const char *fname, const int line)
 static void
 remove_reserved_word_internal (const char *upper_word, const char *fname, const int line)
 {
+	COB_UNUSED (line);
 	add_amendment (upper_word, fname, -1, 0);	/* "line" -1 as we don't want any check here */
 }
 
diff --git a/cobc/tree.c b/cobc/tree.c
index 52229122f..00935eff8 100644
--- a/cobc/tree.c
+++ b/cobc/tree.c
@@ -6042,7 +6042,7 @@ cb_build_call (const cb_tree name, const cb_tree args, const cb_tree on_exceptio
 }
 
 cb_tree
-cb_build_call_parameter (cb_tree arg, int call_mode, int size_mode)
+cb_build_call_parameter (cb_tree arg, int call_mode, const int size_mode)
 {
 	cb_tree	res;
 	if (call_mode != CB_CALL_BY_REFERENCE) {
diff --git a/cobc/tree.h b/cobc/tree.h
index 30234cf59..dac7720a7 100644
--- a/cobc/tree.h
+++ b/cobc/tree.h
@@ -2030,7 +2030,7 @@ extern void			cb_list_exceptions (void);
 extern void			cb_list_registers (void);
 extern void			cb_list_system_routines (void);
 extern int			cb_list_map (cb_tree (*) (cb_tree), cb_tree);
-extern void			cb_strncpy_upper (char *, const char * const, const size_t);
+extern void			cb_strncpy_upper (char *, const char * const, size_t);
 
 /* error.c */
 extern cb_tree			get_cb_error_node (void);
diff --git a/libcob/fileio.c b/libcob/fileio.c
index a55dbc581..a7bff91ac 100644
--- a/libcob/fileio.c
+++ b/libcob/fileio.c
@@ -5378,7 +5378,7 @@ cob_pre_open (cob_file *f)
 		if (max > (size_t)COB_FILE_MAX) {
 			max = (size_t)COB_FILE_MAX;
 		}
-		strncpy(file_open_name, f->fcd->fnamePtr, max);
+		strncpy (file_open_name, f->fcd->fnamePtr, max);
 		for (i = max - 1; ; i--) {
 			if (file_open_name[i] && file_open_name[i] != ' ') {
 				file_open_name[i + 1] = 0;
@@ -8811,8 +8811,9 @@ cob_sys_extfh (const void *opcode_ptr, void *fcd_ptr)
  * Sync FCD3 values to cob_file values
  */
 static void
-cob_fcd_file_sync (cob_file *f, char *file_open_name)
+cob_fcd_file_sync (cob_file *f, char *external_file_open_name)
 {
+	COB_UNUSED (external_file_open_name);
 	copy_fcd_to_file (f->fcd, f);
 }
 
diff --git a/libcob/reportio.c b/libcob/reportio.c
index 2fcdbb36b..5920282ad 100644
--- a/libcob/reportio.c
+++ b/libcob/reportio.c
@@ -1552,7 +1552,7 @@ cob_report_terminate (cob_report *r, int ctl)
 int
 cob_report_generate (cob_report *r, cob_report_line *l, int ctl)
 {
-	cob_report_control	*rc, *rp;
+	cob_report_control	*rc;
 	cob_report_control_ref	*rr;
 	cob_report_line		*pl;
 	static	int		maxctl,ln,num,gengrp, last_use;
@@ -1699,6 +1699,7 @@ cob_report_generate (cob_report *r, cob_report_line *l, int ctl)
 			}
 		}
 		if(maxctl > 0) {
+			cob_report_control *rp;
 			for(rp = r->controls; rp; rp = rp->next) {
 				if(rp->sequence < maxctl
 				&& !rp->data_change) {
@@ -1797,6 +1798,7 @@ cob_report_generate (cob_report *r, cob_report_line *l, int ctl)
 		l->suppress = FALSE;
 		DEBUG_LOG("rw",(" Line# %d SUPPRESSed\n",r->curr_line));
 	} else {
+		cob_report_control *rp = NULL;
 		if(l->fields == NULL
 		&& l->child != NULL
 		&& l->child->sister != NULL) {
@@ -1840,6 +1842,7 @@ cob_report_generate (cob_report *r, cob_report_line *l, int ctl)
 			last_use = l->use_decl;
 			return l->use_decl;
 		}
+		rr = NULL;
 		for(pl = l; pl; pl = pl->sister) {
 			if( NOTDETAIL(pl->flags) ) {
 				DEBUG_LOG("rw",("B NOT Detail Line 0x%X\n",pl->flags));