Enable (only) instructions from architecture arch. By default,
all instructions are permitted.
The following values of arch are accepted: c62x,
c64x, c64x+, c67x, c67x+, c674x.
-matomic
-mno-atomic
Enable or disable the optional C64x+ atomic operation instructions.
By default, they are enabled if no -march option is given, or
if an architecture is specified with -march that implies
these instructions are present (currently, there are no such
architectures); they are disabled if an architecture is specified with
-march on which the instructions are optional or not
present. This option overrides such a default from the architecture,
independent of the order in which the -march or
-matomic or -mno-atomic options are passed.
-mbig-endian
-mlittle-endian
Generate code for the specified endianness. The default is
little-endian.