preproc: Warn if someone predefines non ID as definition

Not sure if someone is used this but to not break
backward compatibility lets simply yield error but
don't stop processing.

http://bugzilla.nasm.us/show_bug.cgi?id=3392300

Reported-by: Dave Shields <thedaveshields@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/preproc.c b/preproc.c
index 12b39782..4e052989 100644
--- a/preproc.c
+++ b/preproc.c
@@ -5203,6 +5203,10 @@ static void pp_pre_define(char *definition)
     if (equals)
         *equals = '=';
 
+    if (space->next->type != TOK_PREPROC_ID &&
+        space->next->type != TOK_ID)
+        error(ERR_WARNING, "pre-defining non ID `%s\'\n", definition);
+
     l = nasm_malloc(sizeof(Line));
     l->next = predef;
     l->first = def;