Cannot build trantor

[tatsumoto-ren]

Hello! I'm having trouble building trantor. I get this error:

/home/ren/.xmake/cache/packages/2602/t/trantor/v1.5.25/source/trantor/utils/Date.cc: In member function ‘const trantor::Date trantor::Date::after(double) const’:
/home/ren/.xmake/cache/packages/2602/t/trantor/v1.5.25/source/trantor/utils/Date.cc:68:38: error: conversion from ‘long int’ to ‘double’ may change value [-Werror=conversion]
   68 |     return Date(static_cast<int64_t>(microSecondsSinceEpoch_ +
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~
/home/ren/.xmake/cache/packages/2602/t/trantor/v1.5.25/source/trantor/utils/Date.cc: In static member function ‘static trantor::Date trantor::Date::fromDbStringLocal(const std::string&)’:
/home/ren/.xmake/cache/packages/2602/t/trantor/v1.5.25/source/trantor/utils/Date.cc:302:29: error: conversion from ‘long int’ to ‘unsigned int’ may change value [-Werror=conversion]
  302 |             year = std::stol(date[0]);
      |                    ~~~~~~~~~^~~~~~~~~
/home/ren/.xmake/cache/packages/2602/t/trantor/v1.5.25/source/trantor/utils/Date.cc:303:30: error: conversion from ‘long int’ to ‘unsigned int’ may change value [-Werror=conversion]
  303 |             month = std::stol(date[1]);
      | 

It looks like -Werror is set in their CMakeLists file:
https://github.com/an-tao/trantor/blob/d56d2262376e4dcb9e7f953d2aa06bd0fc6158ee/CMakeLists.txt#L79

If I manually remove -Werror from that CMakeLists, it builds fine. How can I fix this in my project? Can I add something to xmake.lua to strip -Werror when xmake builds that dependency?

My xmake.lua looks like this:

add_rules("mode.debug", "mode.release")
add_requires("drogon")
target("test")
    add_packages("drogon")
    set_kind("binary")
    add_files("src/*.cpp")

It's odd that the package enables -Werror when those conversions trigger warnings. Could this be caused by my compiler version?

[luadebug]

You can define package with different name and use set_base("some-package-name") or either copy paste existing trantor package code. So we would name it for example package("mytrantor") and use it later on in our project but with io.replace("CMakeLists.txt", "-Werror", "", {plain = true}) inside of on_install(..)
See #9332