From 42eefc854b32b3c1efc27548baaacdebad199853 Mon Sep 17 00:00:00 2001
From: Nico Weber <nicolasweber@gmx.de>
Date: Thu, 5 Apr 2018 14:48:35 -0400
Subject: make `-w dupbuild` default to `err`

You can still opt out of this by passing `-w dupbuild=warn`.
But if you're getting this diagnostic, your build files are incorrect
and you should ideally just fix them.

This is step 3 on https://github.com/ninja-build/ninja/issues/931
I sent an RfC to ninja-build a few months ago; nobody objected.
---
 src/ninja.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/ninja.cc b/src/ninja.cc
index f4246d6..f9efc77 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -1184,6 +1184,7 @@ NORETURN void real_main(int argc, char** argv) {
   BuildConfig config;
   Options options = {};
   options.input_file = "build.ninja";
+  options.dupe_edges_should_err = true;
 
   setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
   const char* ninja_command = argv[0];
-- 
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