`-mbig-obj` is incompatible with `-flto` on mingw compiler and cause problems linking the library in a project

[VasiliPupkin256]

I think this is a bug in mingw compiler, but this library adds the switch to its interface

fmt/CMakeLists.txt

Lines 251 to 256 in c5aafd8

	if (MINGW)
	check_cxx_compiler_flag("-Wa,-mbig-obj" FMT_HAS_MBIG_OBJ)
	if (${FMT_HAS_MBIG_OBJ})
	target_compile_options(fmt PUBLIC "-Wa,-mbig-obj")
	endif()
	endif ()

and this trigger errors "plugin needed to handle lto object"

My system is Ubuntu 20.04 and I am compiling with 86_64-w64-mingw32

May be the requirement can be relaxed for 64 bit projects? What was the reason to include the flag into the config?

[vitaut]

IIRC it was added in response to reports similar to #1684. I think it should be OK to remove it as it is easy to add compiler flags via CMake or at least make it an opt in. A PR would be welcome.