From 966ff773ace4d8a40419f8c9729d972913bb014b Mon Sep 17 00:00:00 2001
From: hariprakaz <hariprakash4389285@gmail.com>
Date: Fri, 10 Apr 2026 17:08:28 +0530
Subject: [PATCH 1/2] Fix mixed path separators on Windows in
 getPlatformSettings (issue #3070)

---
 source/dub/compilers/buildsettings.d | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/source/dub/compilers/buildsettings.d b/source/dub/compilers/buildsettings.d
index 615685ed9..aef3fe8f4 100644
--- a/source/dub/compilers/buildsettings.d
+++ b/source/dub/compilers/buildsettings.d
@@ -545,6 +545,14 @@ void getPlatformSettings(in BuildSettingsTemplate this_, ref BuildSettings dst,
 	// collect source files. Note: D source from 'sourcePaths' and C sources from 'cSourcePaths' are joint into 'sourceFiles'
 	dst.addSourceFiles(collectFiles(this_.sourcePaths, "*.d"));
 	dst.addSourceFiles(collectFiles(this_.cSourcePaths, "*.{c,i}"));
+	version (Windows) {
+		import std.path : buildNormalizedPath;
+		import std.algorithm : map;
+		import std.array : array;
+		dst.sourceFiles = dst.sourceFiles.map!buildNormalizedPath.array;
+		if (!dst.mainSourceFile.empty)
+			dst.mainSourceFile = buildNormalizedPath(dst.mainSourceFile);
+	}
 	auto sourceFiles = dst.sourceFiles.sort();
 
 	// collect import files and remove sources

From af9eb3de8683ffe4c1268b7389acd9443218d963 Mon Sep 17 00:00:00 2001
From: hariprakaz <hariprakash4389285@gmail.com>
Date: Mon, 13 Apr 2026 18:44:18 +0530
Subject: [PATCH 2/2] Add test case for issue #3070 mixed path separators on
 Windows

---
 tests/issue3070/dub.json   | 7 +++++++
 tests/issue3070/src/main.d | 1 +
 tests/run.d                | 1 +
 3 files changed, 9 insertions(+)
 create mode 100644 tests/issue3070/dub.json
 create mode 100644 tests/issue3070/src/main.d
 create mode 100644 tests/run.d

diff --git a/tests/issue3070/dub.json b/tests/issue3070/dub.json
new file mode 100644
index 000000000..1ff76e84c
--- /dev/null
+++ b/tests/issue3070/dub.json
@@ -0,0 +1,7 @@
+{
+  "name": "issue3070",
+  "description": "Test mixed path separators do not duplicate mainSourceFile",
+  "targetType": "executable",
+  "sourcePaths": ["src"],
+  "mainSourceFile": "src/main.d"
+}
diff --git a/tests/issue3070/src/main.d b/tests/issue3070/src/main.d
new file mode 100644
index 000000000..a74017975
--- /dev/null
+++ b/tests/issue3070/src/main.d
@@ -0,0 +1 @@
+void main() {}
diff --git a/tests/run.d b/tests/run.d
new file mode 100644
index 000000000..0a74f315b
--- /dev/null
+++ b/tests/run.d
@@ -0,0 +1 @@
+runDubTest("issue3070");