Compilation error since 11.1.0 with NVIDIA's nvcc compiler

[breyerml]

Using the CMakeLists.txt file:

cmake_minimum_required(VERSION 3.15)

project(MyProject)

enable_language(CUDA)

add_executable(prog main.cu)

include(FetchContent)
FetchContent_Declare(fmt
                 GIT_REPOSITORY https://github.com/fmtlib/fmt.git
                 GIT_TAG 11.1.0
                 QUIET
)
FetchContent_MakeAvailable(fmt)

target_link_libraries(prog PUBLIC fmt::fmt)

with the main.cu file

#include "fmt/format.h"
#include "fmt/chrono.h"

#include <chrono>
#include <iostream>

int main() {
  std::cout << fmt::format("{}", std::chrono::milliseconds{ 10 }) << std::endl;
  return 0;
}

built via cmake .. && make together with nvcc version cuda_12.2.r12.2/compiler.33191640_0 results in the following compiler error:

/Documents/test/fmt/build/_deps/fmt-src/include/fmt/chrono.h(2310): error: too many arguments in function call
          detail::utc_clock::to_sys(val), ctx);
                                    ^

/Documents/test/fmt/build/_deps/fmt-src/include/fmt/chrono.h(2310): error: the object has type qualifiers that are not compatible with the member function "fmt::v11::detail::utc_clock::to_sys"
            object type is: const fmt::v11::detail::utc_clock
          detail::utc_clock::to_sys(val), ctx);
          ^

This error happens with versions 11.1.0,11.1.1, and master.
A git bisect revealed that the offending commit is: 89af1ad

[breyerml]

Changing line 263 in chrono.h from

struct utc_clock {
  void to_sys();
};

to

struct utc_clock {
  template <typename T>
  void to_sys(T);
};

fixes the compilation error with nvcc. But I don't believe that that should be the final fix.

[vitaut]

Adding an argument to the fallback to_sys is the correct fix. A PR would be welcome.

[breyerml]

I opened a PR.