From 4cc72afe4baa6424f0ebf7e91cc2cdcd2ea2c4ae Mon Sep 17 00:00:00 2001
From: Aerilius <aerilius@gmail.com>
Date: Fri, 22 Apr 2016 18:26:26 +0200
Subject: [PATCH] Allow defined variables as values

This patch allows definitions based on previous definitions:
```
#define NARWHAL 0
#define UNICORN 1
#define RHINOCEROS 2
#define ANIMAL UNICORN
```
Previously, the fourth definition's value would be a string "UNICORN" and a condition like:
```
#if ANIMAL == UNICORN
```
would evaluate as "UNICORN" == 1 which is false.
---
 lib/preprocess.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/preprocess.py b/lib/preprocess.py
index 5ab7ca1..990f7b8 100755
--- a/lib/preprocess.py
+++ b/lib/preprocess.py
@@ -469,6 +469,8 @@ def preprocess(infile, outfile=sys.stdout, defines={},
                     var, val = match.group("var", "val")
                     if val is None:
                         val = None
+                    elif val in defines:
+                        val = defines[val]
                     else:
                         try:
                             val = eval(val, {}, {})