Other switches might set changed as true. Use extraStrings size

Author: brenoguim

src/patchelf.cc

@@ -2134,7 +2134,7 @@ void ElfFile<ElfFileParamNames>::renameDynamicSymbols(const std::unordered_map<s
         }
     }
 
-    if (changed)
+    if (!extraStrings.empty())
     {
         auto newStrTabSize = strTab.size() + extraStrings.size();
         auto& newSec = replaceSection(".dynstr", newStrTabSize);

tests/rename-dynamic-symbols.sh

@@ -82,3 +82,9 @@ ${PATCHELF} --rename-dynamic-symbols ../map *
 
 echo "# Run the patched tool and libraries"
 env LD_BIND_NOW=1 LD_LIBRARY_PATH=${PWD} ./many-syms-main
+
+# Test that other switches still work when --rename-dynamic-symbols has no effect
+echo "SYMBOL_THAT_DOESNT_EXIST ANOTHER_NAME" > map
+${PATCHELF} --set-rpath changed_rpath --rename-dynamic-symbols map --output libnewrpath.so "$full_lib_name"
+[ "$(${PATCHELF} --print-rpath libnewrpath.so)" = changed_rpath ] || exit 1
+