parser: add the actual name of a label to the label-orphan warning

The label-orphan warning is *way* more useful if it includes the
actual label name; this way the programmer can usually spot
immediately if it is a label or misspelled instruction.

Signed-off-by: H. Peter Anvin (Intel) <[email protected]>

Author: H. Peter Anvin

asm/parser.c

@@ -746,15 +746,17 @@ insn *parse_line(char *buffer, insn *result, const int bits)
 
     if (i == TOKEN_ID || (insn_is_label && i == TOKEN_INSN)) {
         /* there's a label here */
+        struct tokenval label = tokval;
         first = false;
         result->label = tokval.t_charptr;
         i = stdscan(NULL, &tokval);
         colonless_label = i != ':';
         if (i == ':') {         /* skip over the optional colon */
             i = stdscan(NULL, &tokval);
         } else if (i == 0) {
-            nasm_warn(WARN_LABEL_ORPHAN ,
-                      "label alone on a line without a colon might be in error");
+            nasm_warn(WARN_LABEL_ORPHAN,
+                      "label `%*s' alone on a line without a colon might be in error",
+                      (int)label.t_len, label.t_start);
         }
         if (i != TOKEN_INSN || tokval.t_integer != I_EQU) {
             /*

travis/test/aoutso.stderr

@@ -1 +1 @@
-./travis/test/aoutso.asm:79: warning: label alone on a line without a colon might be in error [-w+label-orphan]
+./travis/test/aoutso.asm:79: warning: label `.end' alone on a line without a colon might be in error [-w+label-orphan]

travis/test/elfso-o0.stderr

@@ -1 +1 @@
-./travis/test/elfso.asm:83: warning: label alone on a line without a colon might be in error [-w+label-orphan]
+./travis/test/elfso.asm:83: warning: label `.end' alone on a line without a colon might be in error [-w+label-orphan]

travis/test/elfso-ox.stderr

@@ -1 +1 @@
-./travis/test/elfso.asm:83: warning: label alone on a line without a colon might be in error [-w+label-orphan]
+./travis/test/elfso.asm:83: warning: label `.end' alone on a line without a colon might be in error [-w+label-orphan]

travis/test/tmap.stderr

@@ -1 +1 @@
-./travis/test/tmap.asm:938: warning: label alone on a line without a colon might be in error [-w+label-orphan]
+./travis/test/tmap.asm:938: warning: label `.loop' alone on a line without a colon might be in error [-w+label-orphan]