def _merge_flags(cls, flags: T.List[str]) -> T.List[str]:
        r"""
        The flags to NVCC gets exceedingly verbose and unreadable when too many of them
        are shielded with -Xcompiler. Merge consecutive -Xcompiler-wrapped arguments
        into one.
        """
        if len(flags) <= 1:
            return flags
        flagit = iter(flags)
        xflags = []

        def is_xcompiler_flag_isolated(flag: str) -> bool:
            return flag == '-Xcompiler'

        def is_xcompiler_flag_glued(flag: str) -> bool:
            return flag.startswith('-Xcompiler=')

        def is_xcompiler_flag(flag: str) -> bool:
            return is_xcompiler_flag_isolated(flag) or is_xcompiler_flag_glued(flag)

        def get_xcompiler_val(flag: str, flagit: T.Iterator[str]) -> str:
            if is_xcompiler_flag_glued(flag):
                return flag[len('-Xcompiler='):]
            else:
                try:
                    return next(flagit)
                except StopIteration:
                    return ""

        ingroup = False
        for flag in flagit:
            if not is_xcompiler_flag(flag):
                ingroup = False
                xflags.append(flag)
            elif ingroup:
                xflags[-1] += ','
                xflags[-1] += get_xcompiler_val(flag, flagit)
            elif is_xcompiler_flag_isolated(flag):
                ingroup = True
                xflags.append(flag)
                xflags.append(get_xcompiler_val(flag, flagit))
            elif is_xcompiler_flag_glued(flag):
                ingroup = True
                xflags.append(flag)
            else:
                raise ValueError("-Xcompiler flag merging failed, unknown argument form!")
        return xflags

        The flags to NVCC gets exceedingly verbose and unreadable when too many of them
        are shielded with -Xcompiler. Merge consecutive -Xcompiler-wrapped arguments
        into one.
        
mesonbuild/compilers/cuda.py