Thanks for your reply
cross compilation from PC ubuntu run fine

From pico board gcc and arm-linux-gnueabihf-gcc commands with option -c compile to file main.o
Without option -c show the error
"/usr/bin/ld cannot find -lgcc: No such file or directory"
I think is a configuration problem
Compiler ...

When execute gcc hello.c with the sdcard ubuntu distribution I have the error "cannot find -lgcc"
I have tested mini-A, plus and pro boards

Does anyone know the solution to the problem?