3 files changed, 11 insertions, 4 deletions
diff --git a/devtools/create_project/create_project.cpp b/devtools/create_project/create_project.cpp
index 8eba73d7b3..6072120a15 100644
--- a/devtools/create_project/create_project.cpp
+++ b/devtools/create_project/create_project.cpp
@@ -1527,7 +1527,8 @@ void ProjectProvider::addFilesToProject(const std::string &dir, std::ofstream &p
 	StringList duplicate;
 
 	for (StringList::const_iterator i = includeList.begin(); i != includeList.end(); ++i) {
-		const std::string fileName = getLastPathComponent(*i);
+		std::string fileName = getLastPathComponent(*i);
+		std::transform(fileName.begin(), fileName.end(), fileName.begin(), tolower);
 
 		// Leave out non object file names.
 		if (fileName.size() < 2 || fileName.compare(fileName.size() - 2, 2, ".o"))
@@ -1540,7 +1541,9 @@ void ProjectProvider::addFilesToProject(const std::string &dir, std::ofstream &p
 		// Search for duplicates
 		StringList::const_iterator j = i; ++j;
 		for (; j != includeList.end(); ++j) {
-			if (fileName == getLastPathComponent(*j)) {
+			std::string candidateFileName = getLastPathComponent(*j);
+			std::transform(candidateFileName.begin(), candidateFileName.end(), candidateFileName.begin(), tolower);
+			if (fileName == candidateFileName) {
 				duplicate.push_back(fileName);
 				break;
 			}
diff --git a/devtools/create_project/msbuild.cpp b/devtools/create_project/msbuild.cpp
index 2c6a89543f..3accce4e05 100644
--- a/devtools/create_project/msbuild.cpp
+++ b/devtools/create_project/msbuild.cpp
@@ -514,7 +514,9 @@ void MSBuildProvider::writeFileListToProject(const FileNode &dir, std::ofstream
 	if (!_compileFiles.empty()) {
 		projectFile << "\t<ItemGroup>\n";
 		for (std::list<FileEntry>::const_iterator entry = _compileFiles.begin(); entry != _compileFiles.end(); ++entry) {
-			const bool isDuplicate = (std::find(duplicate.begin(), duplicate.end(), (*entry).name + ".o") != duplicate.end());
+			std::string fileName = (*entry).name + ".o";
+			std::transform(fileName.begin(), fileName.end(), fileName.begin(), tolower);
+			const bool isDuplicate = (std::find(duplicate.begin(), duplicate.end(), fileName) != duplicate.end());
 
 			// Deal with duplicated file names
 			if (isDuplicate) {
diff --git a/devtools/create_project/visualstudio.cpp b/devtools/create_project/visualstudio.cpp
index 96fdbdf27a..d63c347b17 100644
--- a/devtools/create_project/visualstudio.cpp
+++ b/devtools/create_project/visualstudio.cpp
@@ -338,7 +338,9 @@ void VisualStudioProvider::writeFileListToProject(const FileNode &dir, std::ofst
 			if (producesObjectFile(node->name)) {
 				std::string name, ext;
 				splitFilename(node->name, name, ext);
-				const bool isDuplicate = (std::find(duplicate.begin(), duplicate.end(), name + ".o") != duplicate.end());
+				name += ".o";
+				std::transform(name.begin(), name.end(), name.begin(), tolower);
+				const bool isDuplicate = (std::find(duplicate.begin(), duplicate.end(), name) != duplicate.end());
 
 				if (ext == "asm") {
 					std::string objFileName = "$(IntDir)\\";