Use `gnu::format` attribute only when compiling with Clang, as using it against variadic template functions is a Clang extension and is not supported by GCC. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77958 Fixes #119069
Use `gnu::format` attribute only when compiling with Clang, as using it against variadic template functions is a Clang extension and is not supported by GCC. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77958 Fixes #119069