From 6fcd905aacf302540bbc3e84671dba9222e2d06b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 31 Dec 2022 00:34:41 +0200
Subject: [PATCH] Avoid observing the same header twice in ObjectFile

This is a bit crude since the dependencies are not sorted, but still
avoids a massive slowdown from updating dependencies many times when a
header is generated.
---
 source/lib/objectfile.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/source/lib/objectfile.cpp b/source/lib/objectfile.cpp
index 00fa679..65ad433 100644
--- a/source/lib/objectfile.cpp
+++ b/source/lib/objectfile.cpp
@@ -54,11 +54,12 @@ void ObjectFile::find_dependencies()
 	vector<FileTarget *> headers;
 	find_dependencies(source, headers);
 	for(FileTarget *h: headers)
-	{
-		add_dependency(*h);
-		if(h->get_real_target()->is_buildable())
-			h->signal_modified.connect(sigc::mem_fun(this, static_cast<void (ObjectFile::*)()>(&ObjectFile::find_dependencies)));
-	}
+		if(!any_equals(depends, static_cast<Target *>(h)))
+		{
+			add_dependency(*h);
+			if(h->get_real_target()->is_buildable())
+				h->signal_modified.connect(sigc::mem_fun(this, static_cast<void (ObjectFile::*)()>(&ObjectFile::find_dependencies)));
+		}
 }
 
 void ObjectFile::find_dependencies(FileTarget &tgt, vector<FileTarget *> &headers)
-- 
2.45.2