V1.21 - Fixed the .IF .REF implementation. It will now detect a forwa…

…rd reference to a label correctly.

This is useful in building libraries and excluding code from them if the functions or data is not being referenced. i.e. If there is no JSR FUNC1 then the code if the .IF block is not generated.
.IF .DEF func1
     func1 ...
.ENDIF

README.md

@@ -1,6 +1,6 @@
-# ATasm v1.20
+# ATasm v1.21
 ### A mostly Mac/65 compatible 6502 cross-assembler 
-Copyright (c) 1998-2021 Mark Schmelzenbach, modified by Peter Hinz (2022)
+Copyright (c) 1998-2021 Mark Schmelzenbach, modified by Peter Hinz (2021-2023)
 
 *ATasm is a 6502 command-line cross-assembler that is compatible with the original Mac/65 macroassembler released by OSS software. Code development can now be performed using "modern" editors and compiles with lightning speed.*
 

VERSION.TXT

@@ -170,4 +170,13 @@ Dec 28, 2022
 				Slight warning and error format change to make it external parsable.
 
 Dec 29, 2022
-  version 1.20 - Added the .ELSEIF directive to build easier .IF .ELSEIF .ELSE .ENDIF control blocks.
+  version 1.20 - Added the .ELSEIF directive to build easier .IF .ELSEIF .ELSE .ENDIF control blocks.
+
+Jan 4, 2023
+  version 1.21 - Fixed the .ref implementation. It will now detect a forward reference to a label correctly.
+				This is useful in building libraries and excluding code from them if the functions or data
+				is not being referenced. i.e. If there is no JSR FUNC1 then the code if the .IF block is
+				not generated.
+				.IF .DEF func1
+					func1 ...
+				.ENDIF

docs/atasm.blurb

@@ -1,6 +1,6 @@
-                         ATasm v1.20
+                         ATasm v1.21
                   A mostly Mac/65 compatible 6502 cross-assembler
-                    Copyright (c) 1998-2021 Mark Schmelzenbach 
+                    Copyright (c) 1998-2023 Mark Schmelzenbach 
 
 ATasm is a 6502 command-line cross-assembler that is compatible with the
 original Mac/65 macroassembler released by OSS software.  Code

docs/atasm.txt

@@ -1,5 +1,5 @@
 ============================================================================
-ATasm v1.20
+ATasm v1.21
 A mostly Mac/65 compatible 6502 cross-assembler
 
 Copyright (c) 1998-2022 Mark Schmelzenbach
@@ -228,6 +228,13 @@ Version 1.19 - Modified the * program counter command to also name a memory regi
 				Slight warning and error format change to make it external parsable.
 Version 1.20 - Added the .ELSEIF directive to build easier .IF .ELSEIF .ELSE .ENDIF 
 				control blocks.
+Version 1.21 - Fixed the .ref implementation. It will now detect a forward reference to a label correctly.
+				This is useful in building libraries and excluding code from them if the functions or data
+				is not being referenced. i.e. If there is no JSR FUNC1 then the code if the .IF block is
+				not generated.
+				.IF .DEF func1
+					func1 ...
+				.ENDIF
 
 ============================================================================
 Chapter 1: ATasm

src/setparse.c

@@ -301,7 +301,14 @@ int get_signed_expression(char *str, int tp) {
         look+=v;
         sym=validate_symbol(work);
         if (!sym)
-          *walk++='0';
+        {
+            // The symbol does not exist yet, but we can still look in the undefined label list, it might be there later 
+            unkLabel* look = isUnk(work);
+            if (look)
+                *walk++ = '1';
+            else
+                *walk++ = '0';
+        }
         else {
           if (sym->ref)
             *walk++='1';

src/symbol.h

@@ -22,7 +22,7 @@
 #define SYMBOL_H
 
 #define MAJOR_VER 1
-#define MINOR_VER 20
+#define MINOR_VER 21
 #define BETA_VER 0
 
  /*==========================================================================*/

tests/ifref.asm

@@ -0,0 +1,18 @@
+	*=$2000
+
+	jsr func1
+	rts
+
+.IF .REF func1
+func1
+	lda #1
+	sta $4000
+	rts
+.ENDIF	
+
+.IF .REF func2
+func2
+	lda #1
+	sta $4000
+	rts
+.ENDIF