From e946eb2a4109e0de5f8514457f851897a4824c3e Mon Sep 17 00:00:00 2001
From: Vlad Vissoultchev <wqweto@gmail.com>
Date: Wed, 6 Apr 2016 18:57:11 +0300
Subject: Implement -dM preprocessor option as in gcc

There was already support for -dD option but in contrast -dM dumps only `#define` directives w/o actual preprocessor output.

The original -dD output differs from gcc output by additional comment in front of `#define`s so this quirk is left for -dM as well.
---
 tcc.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'tcc.c')

diff --git a/tcc.c b/tcc.c
index 9daf6e6..95e1a15 100644
--- a/tcc.c
+++ b/tcc.c
@@ -301,6 +301,9 @@ int main(int argc, char **argv)
             if (!s->ppfp)
                 tcc_error("could not write '%s'", s->outfile);
         }
+        s->dffp = s->ppfp;
+        if (s->dflag == 'M')
+            s->ppfp = NULL;
     }
 
     tcc_set_output_type(s, s->output_type);
-- 
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