RISC-V: Add custom RTEMS multilibs

Programming / Compilers / GCC - sh [138bc75d-0d04-0410-961f-82ee72b054a4] - 15 June 2018 05:19 EDT

Add multilib variants for -march=rv64imafd, e.g. to support the BOOMv2 core.

Add -mcmodel=medany as a variant of the 64-bit multilibs for RTEMS. The rationale for this change is that several existing RISC-V chips map the RAM at 0x80000000. In RTEMS, we do not use virtual memory, so applications will run at this location which is outside the +-2GiB range in a 64-bit configuration.

- config.gcc (riscv*-*-elf* | riscv*-*-rtems*): Use custom multilibs for *-*-rtems*.
- config/riscv/t-rtems: New file.

46765867363 RISC-V: Add custom RTEMS multilibs
gcc/ChangeLog | 6 ++++++
gcc/config.gcc | 20 +++++++++++---------
gcc/config/riscv/t-rtems | 25 +++++++++++++++++++++++++
3 files changed, 42 insertions(+), 9 deletions(-)

Upstream: gcc.gnu.org

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