sanitize paths

src/CompileStep.h

 
 #include "DepNode.h"
 #include "BXParser.h"
+#include "sys.h"
 #include "toolchain.h"
 
 class CompileStep: public DepNode {
 	std::vector<std::string> compileCommand_;
 	std::vector<std::string> &compileCommand(const std::string &outDir);
 
-	std::string confPath(const std::string &outDir) { return outDir + '/' + path_ + ".bx"; }
+	std::string confPath(const std::string &outDir) {
+		return outDir + '/' + sys::sanitizePath(path_) + ".bx";
+	}
 };

src/sys.cc

 
 static thread_local std::unordered_set<std::string> mkdirp_set;
 
+std::string sanitizePath(const std::string &path) {
+	std::string npath;
+	size_t idx = 0;
+	while (idx < path.size()) {
+		if (idx >= path.size() - 2) {
+			npath += path[idx++];
+		} else if (path[idx] == '.' && path[idx + 1] == '.' && path[idx + 2] == '/') {
+			npath += "__parent__/";
+			idx += 3;
+		} else {
+			npath += path[idx++];
+		}
+	}
+
+	if (npath[npath.size() - 1] == '.' && npath[npath.size() - 2] == '.') {
+		npath.replace(npath.size() - 2, 2, "__parent__");
+	}
+
+	return npath;
+}
+
 FileInfo fileInfo(const std::string &path) {
 	FileInfo finfo;
 

src/sys.h

 	}
 };
 
+std::string sanitizePath(const std::string &path);
 FileInfo fileInfo(const std::string &path);
 bool fileExists(const std::string &path);
 void mkdirp(const std::string &path);

src/toolchain.cc

 }
 
 std::string objectFilePath(const std::string &path, const std::string &outDir) {
-	return outDir + '/' + path + ".o";
+	return outDir + '/' + sys::sanitizePath(path) + ".o";
 }
 
 std::string targetFilePath(
 		TargetType type,
 		const std::string &path,
 		const std::string &outDir) {
-	std::string base = outDir + '/' + path;
+	std::string base = outDir + '/' + sys::sanitizePath(path);
 
 	switch (type) {
 	case TargetType::BINARY: