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examples: make: specify CROSS_COMPILE for fomu

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When BOARD=fomu, use the riscv cross-compiler.  Otherwise, use the
default arm compiler.  This can be overridden by passing
CROSS_COMIPLE on the command line.

Note that there are now three common risc-v prefixes:

    - riscv32-unknown-elf- : Common for users who compile their own
    - riscv64-unknown-elf- : Upstream multiarch toolchain from SiFive
    - riscv-none-embed-    : xPack embedded version of SiFive toolchain

Here we assume users are using the `riscv-none-embed-` toolchain from
xPack, because it appears to be growing more common.  Additionally,
there is much confusion surrounding `riscv64-unknown-elf-`, which
actually includes both 32- and 64-bit runtimes and can generate software
for both.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-11-13 09:26:00 -08:00
parent 737d437ab8
commit dce070ebe0
1 changed files with 5 additions and 1 deletions
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6
examples/make.mk
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@ -2,8 +2,12 @@
# Common make definition for all examples
#
# Compiler
# Compiler
ifeq ($(BOARD), fomu)
CROSS_COMPILE = riscv-none-embed-
else
CROSS_COMPILE = arm-none-eabi-
endif
CC = $(CROSS_COMPILE)gcc
CXX = $(CROSS_COMPILE)g++
OBJCOPY = $(CROSS_COMPILE)objcopy