src/tex2lyx/Parser.cpp:898:39: error: adding 'uint32_t' (aka 'unsigned int') to a string does not append to the string [-Werror,-Wstring-plus-int]
warning_message("ignoring a char: " + static_cast<uint32_t>(c));
~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
src/tex2lyx/Parser.cpp:898:39: note: use array indexing to silence this warning
warning_message("ignoring a char: " + static_cast<uint32_t>(c));
^
& [ ]
1 error generated.