+// Compute the relative path from From to To.
+static std::string computeRelativePath(StringRef From, StringRef To) {
+ if (sys::path::is_absolute(From) || sys::path::is_absolute(To))
+ return To;
+
+ StringRef DirFrom = sys::path::parent_path(From);
+ auto FromI = sys::path::begin(DirFrom);
+ auto ToI = sys::path::begin(To);
+ while (*FromI == *ToI) {
+ ++FromI;
+ ++ToI;
+ }
+
+ SmallString<128> Relative;
+ for (auto FromE = sys::path::end(DirFrom); FromI != FromE; ++FromI)
+ sys::path::append(Relative, "..");
+
+ for (auto ToE = sys::path::end(To); ToI != ToE; ++ToI)
+ sys::path::append(Relative, *ToI);
+
+ return Relative.str();
+}
+
+static void writeStringTable(raw_fd_ostream &Out, StringRef ArcName,