he command-line option '--relax' enables the
generation of trampolines that can access the entire 32-bit address
space for calls outside the normal 'call' and 'jmpi' address range.
These trampolines are inserted at section boundaries, so may not
themselves be reachable if an input section and its associated call
trampolines are larger than 256MB.

   The '--relax' option is enabled by default unless '-r' is also
specified.  You can disable trampoline generation by using the
'--no-relax' linker option.  You can also disable this optimization
locally by using the 'set .noat' directive in assembly-language source
files, as the linker-inserted trampolines use the 'at' register as a
temporary.

   Note that the linker '--relax' option is independent of assembler
relaxation options, and that using the GNU assembler's '-relax-all'
option interferes with the linker's more selective call instruction
relaxation.