Fix duplicate source files on Windows due to mixed path separators (#3070)

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

test/issue3070.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Test for https://github.com/dlang/dub/issues/3070
+# Verify mixed path separators don't cause duplicate source file errors.
+set -e
+. $(dirname "${BASH_SOURCE[0]}")/common.sh
+cd ${CURR_DIR}/issue3070
+$DUB build --compiler=${DC} 2>&1
+echo "PASS: No duplicate source file error with mixed path separators."

test/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"
+}

test/issue3070/src/main.d

@@ -0,0 +1 @@
+void main() {}