ucb-bar/riscv-gcc — pull request #9 by darius-bluespec (2014-08-15 20:46:17+00:00)
Title: Add support for -mno-atomic to gcc and glibc.

When the flag is passed, atomic memory operations (RV32A, RV64A)
are avoid by gcc and glibc. Atomic locking necessary for NPTL is
done via a new Linux system call. Previous behavior utilizing
atomic memory instructions (i.e., -matomic) is the default.

This change is mutually dependent on the corresponding change to
riscv-linux.

Also update Linux headers from Linux 3.14.15 and riscv-linux
master to simplify changes due to -mno-atomic.