Floats on RISC-V

gistfile1.txt

# Build log



# Precompiled toolchain 

Binaries from https://github.com/im-tomu/fomu-toolchain/releases/download/v1.5.3/fomu-toolchain-linux_x86_64-v1.5.3.tar.gz 

ld: libm.a(lib_a-sf_expm1.o): in function `.L0 ':
sf_expm1.c:(.text+0x4e0): undefined reference to `__math_oflowf'
ld: riscv-blink.elf: hidden symbol `__math_oflowf' isn't defined
ld: final link failed: bad value
collect2: error: ld returned 1 exit status
make: *** [Makefile:81: riscv-blink.elf] Error 1


# Own-compiled toolchain

Plain compiled from https://github.com/riscv/riscv-gnu-toolchain

( export LC_ALL=C ; make QUIET= ; ) 2>&1 | sed 's|/home/[^:]*/\([^/:]*:\)|\1|g'

echo "  CC       ./src/superbot_neural_network.c	superbot_neural_network.o"
  CC       ./src/superbot_neural_network.c	superbot_neural_network.o
riscv64-unknown-elf-gcc -c ./src/superbot_neural_network.c -I./include -D__vexriscv__ -march=rv32i  -mabi=ilp32 -DSUPERBOT_FOMU_HACKER=1 -Wall -Wextra -ffunction-sections -fdata-sections -fno-common -fomit-frame-pointer -Os -march=rv32i -DGIT_VERSION=u\"v0.1-133-gbb85ddb\" -std=gnu11 -ggdb -g -DDEBUG -Wall -o .obj/superbot_neural_network.o -MMD
echo "  LD       riscv-blink.elf"
  LD       riscv-blink.elf
riscv64-unknown-elf-gcc .obj/time.o .obj/rgb.o .obj/superbot_neural_network.o .obj/usb-dev.o .obj/usb.o .obj/superbot_matrix.o .obj/main.o .obj/usb-eptri.o .obj/usb-epfifo.o  .obj/crt0-vexriscv.o -I./include -D__vexriscv__ -march=rv32i  -mabi=ilp32 -DSUPERBOT_FOMU_HACKER=1 -Wall -Wextra -ffunction-sections -fdata-sections -fno-common -fomit-frame-pointer -Os -march=rv32i -DGIT_VERSION=u\"v0.1-133-gbb85ddb\" -std=gnu11 -lm -L./ld -nostartfiles -Wl,--gc-sections -Wl,--no-warn-mismatch -Wl,--script=./ld/linker.ld -Wl,--build-id=none -ggdb -g -Wall -o riscv-blink.elf
ld: .obj/time.o: in function `msleep':
time.c:39: undefined reference to `__mulsi3'
ld: .obj/superbot_matrix.o: in function `matrix_multiply_vector':
superbot_matrix.c:13: undefined reference to `__mulsf3'
ld: superbot_matrix.c:13: undefined reference to `__addsf3'
ld: riscv-blink.elf(.text): relocation ".L9+0x0 (type R_RISCV_RVC_JUMP)" goes out of range
ld: libc.a(lib_a-memcpy.o): file class ELFCLASS64 incompatible with ELFCLASS32
ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
make: *** [Makefile:81: riscv-blink.elf] Error 1



ld: .obj/time.o: in function `msleep':
time.c:39: undefined reference to `__mulsi3'
ld: .obj/superbot_matrix.o: in function `matrix_multiply_vector':
superbot_matrix.c:13: undefined reference to `__mulsf3'
ld: superbot_matrix.c:13: undefined reference to `__addsf3'

=> missing primitives

ld: libm.a(lib_a-sf_tanh.o): file class ELFCLASS64 incompatible with ELFCLASS32
ld: final link failed: file in wrong format

=> mfmf, note sure about the cause.  I compiled with default settings.

collect2: error: ld returned 1 exit status
make: *** [Makefile:81: riscv-blink.elf] Error 1


Notice: none of the toolchain was installed globally. I activate one or the other (not both) by changing the PATH of the shell that runs make.