Fix wrong filename on not called functions

If the function were declared in another (included file)
the origina name was not shown, but the main one. Fixed.

Author: boriel

api/optimize.py

@@ -140,7 +140,8 @@ def visit_CALL(self, node):
 
     def visit_FUNCDECL(self, node):
         if self.O_LEVEL > 1 and not node.entry.accessed:
-            warning(node.entry.lineno, "Function '%s' is never called and has been ignored" % node.entry.name)
+            warning(node.entry.lineno, "Function '%s' is never called and has been ignored" % node.entry.name,
+                    fname=node.entry.filename)
             yield self.NOP
         else:
             node.children[1] = (yield ToVisit(node.entry))

tests/functional/opt2_include_unused.asm

@@ -0,0 +1,37 @@
+	org 32768
+__START_PROGRAM:
+	di
+	push ix
+	push iy
+	exx
+	push hl
+	exx
+	ld hl, 0
+	add hl, sp
+	ld (__CALL_BACK__), hl
+	ei
+	jp __MAIN_PROGRAM__
+ZXBASIC_USER_DATA:
+	; Defines USER DATA Length in bytes
+ZXBASIC_USER_DATA_LEN EQU ZXBASIC_USER_DATA_END - ZXBASIC_USER_DATA
+	.__LABEL__.ZXBASIC_USER_DATA_LEN EQU ZXBASIC_USER_DATA_LEN
+	.__LABEL__.ZXBASIC_USER_DATA EQU ZXBASIC_USER_DATA
+ZXBASIC_USER_DATA_END:
+__MAIN_PROGRAM__:
+	ld hl, 0
+	ld b, h
+	ld c, l
+__END_PROGRAM:
+	di
+	ld hl, (__CALL_BACK__)
+	ld sp, hl
+	exx
+	pop hl
+	pop iy
+	pop ix
+	exx
+	ei
+	ret
+__CALL_BACK__:
+	DEFW 0
+	END

tests/functional/opt2_include_unused.bas

@@ -0,0 +1,2 @@
+#include "func0.bas"
+

tests/functional/test_errmsg.txt

@@ -160,4 +160,7 @@ dim_at_label7.bas:3: error: Circular dependency between 'a' and 'c'
 dim_at_label7.bas:4: error: Circular dependency between 'c' and 'b'
 >>> process_file('include_error.bas')
 llb.bas:3: error: Undeclared function "f$"
+>>> process_file('opt2_include_unused.bas')
+func0.bas:5: warning: Using default implicit type 'float' for 'f'
+func0.bas:4: warning: Function 'f' is never called and has been ignored