[ppc64le] nvcc question : is there an equivalent to gcc -fsigned-char flag

I’m porting x86 code to ppc64le. The source contains c/c++/cuda code.

On ppc64le the default char type is unsigned, but on x86 the char defaults to signed.
When compiling on ppc64le using gcc/g++ I can force char to be signed by using -fsigned-char flag.

Is there an equivalent flag for nvcc ? If not how can I force char type to be signed ?

It might be sufficient to do:

-Xcompiler -fsigned-char

I haven’t actually tried it though.