cederom edited a comment on issue #4674:
URL:
https://github.com/apache/incubator-nuttx/issues/4674#issuecomment-945206929
Thanks @xiaoxiang781216 and @Ouss4 (at the mailing lit) for the hints :-)
The quickest way to overcome this problem is to use `make
CROSSDEV=riscv32-esp-elf-`.
I did some toolchain auto-detection in
`arch/risc-v/src/rv32im/Toolchain.defs`:
```
RVTOOLCHAINS := \
riscv64-none-elf-\
riscv32-esp-elf-\
riscv32-unknown-elf-\
riscv64-unknown-elf
RVTOOLCHAINS_AVAILABLE := $(foreach rvtoolchain, $(RVTOOLCHAINS),\
$(if $(shell which $(rvtoolchain)gcc), $(rvtoolchain) ) )
CROSSDEV ?= $(word 1,${RVTOOLCHAINS_AVAILABLE})
$(info "USING CROSSDEV: ${CROSSDEV}")
```
The problem is it auto-detects over and over during build, as the file is
called multiple times, rendering build process inefficient. This is not the way
to go, at least not in this location :-)
I have found only ESP-IDF `riscv32-esp-elf-` toolchain to build the firmware
with success (on Linux and BSD). I did not try the `riscv64-unknown-elf` but
this one seems to work for you.
Also I have verified following toolchains NOT to build the firmware out of
the box:
1. FreeBSD system package `riscv64-none-elf-` has `-lm` linking problem at
the end of build:
```
"USING CROSSDEV: riscv64-none-elf-"
AS: chip/esp32c3_head.S
gmake[2]: Entering directory
'/XXX/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
"USING CROSSDEV: riscv64-none-elf-"
CC: esp32c3_boot.c
CC: esp32c3_bringup.c
CC: esp32c3_appinit.c
CC: esp32c3_board_wlan.c
AR (create): libboard.a esp32c3_boot.o esp32c3_bringup.o esp32c3_appinit.o
esp32c3_board_wlan.o
gmake[2]: Leaving directory
'/XXX/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
LD: nuttx
riscv64-none-elf-ld: skipping incompatible /usr/lib/libm.so when searching
for -lm
riscv64-none-elf-ld: skipping incompatible /usr/lib/libm.a when searching
for -lm
riscv64-none-elf-ld: cannot find -lm
riscv64-none-elf-ld: skipping incompatible /usr/lib/libm.so when searching
for -lm
gmake[1]: *** [Makefile:145: nuttx] Error 1
gmake[1]: Leaving directory '/XXX/nuttx.git/nuttx/arch/risc-v/src'
gmake: *** [tools/Makefile.unix:420: nuttx] Error 2
```
2. FreeBSD system package `riscv32-unknown-elf-` has `-lm` linking problem
at the end of build:
```
"USING CROSSDEV: riscv32-unknown-elf-"
AS: chip/esp32c3_head.S
gmake[2]: Entering directory
'/XXX/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
"USING CROSSDEV: riscv32-unknown-elf-"
CC: esp32c3_boot.c
CC: esp32c3_bringup.c
CC: esp32c3_appinit.c
CC: esp32c3_board_wlan.c
AR (create): libboard.a esp32c3_boot.o esp32c3_bringup.o esp32c3_appinit.o
esp32c3_board_wlan.o
gmake[2]: Leaving directory
'/XXX/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
LD: nuttx
riscv32-unknown-elf-ld: skipping incompatible /usr/lib/libm.so when
searching for -lm
riscv32-unknown-elf-ld: skipping incompatible /usr/lib/libm.a when searching
for -lm
riscv32-unknown-elf-ld: cannot find -lm
riscv32-unknown-elf-ld: skipping incompatible /usr/lib/libm.so when
searching for -lm
gmake[1]: *** [Makefile:145: nuttx] Error 1
gmake[1]: Leaving directory '/XXX/nuttx.git/nuttx/arch/risc-v/src'
gmake: *** [tools/Makefile.unix:420: nuttx] Error 2
```
3. Debian Linux system package `riscv32-unknown-elf-` has wrong linking
format problem at the end of build:
```
$ make CROSSDEV=riscv64-linux-gnu-
(...)
C: bluetooth/bt_uuid.c
AR (create): libwireless.a bt_buf.o bt_netdev.o bt_queue.o bt_hcicore.o
bt_atomic.o bt_att.o bt_conn.o bt_gatt.o bt_ioctl.o bt_keys.o bt_l2cap.o
bt_smp.o bt_uuid.o
make[1]: Leaving directory '/home/user/work/nuttx/nuttx.git/nuttx/wireless'
IN: wireless/libwireless.a -> staging/libwireless.a
make[1]: Entering directory
'/home/user/work/nuttx/nuttx.git/nuttx/arch/risc-v/src'
AS: chip/esp32c3_head.S
make[2]: Entering directory
'/home/user/work/nuttx/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
CC: esp32c3_boot.c
CC: esp32c3_bringup.c
CC: esp32c3_appinit.c
CC: esp32c3_board_wlan.c
AR (create): libboard.a esp32c3_boot.o esp32c3_bringup.o esp32c3_appinit.o
esp32c3_board_wlan.o
make[2]: Leaving directory
'/home/user/work/nuttx/nuttx.git/nuttx/boards/risc-v/esp32c3/esp32c3-devkit/src'
LD: nuttx
riscv64-linux-gnu-ld:
/usr/lib/gcc-cross/riscv64-linux-gnu/8/../../../../riscv64-linux-gnu/lib/libm.so:
error adding symbols: file in wrong format
make[1]: *** [Makefile:145: nuttx] Error 1
make[1]: Leaving directory
'/home/user/work/nuttx/nuttx.git/nuttx/arch/risc-v/src'
make: *** [tools/Makefile.unix:420: nuttx] Error 2
```
For above "generic" system toolchains probably a `-l` needs to be passed to
use NuttX libraries not the system ones.
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