walbon opened a new pull request #3068:
URL: https://github.com/apache/incubator-nuttx/pull/3068
## Summary
Previously the defconfig was setting the toolchain from the buildroot, so if
the user follow the steps in the documentation [1], the user will got an error
from building step when it is looking for the gcc-arm-***nuttx***-eabi, instead
of the default toolchain gcc-arm-***none***-eabi.
```
sh: 1: arm-nuttx-eabi-gcc: not found
ERROR: arm-nuttx-eabi-gcc failed: 127
command: arm-nuttx-eabi-gcc -MT
./myapp_main.root.Nuttx.apps.examples.myapp.o -M '-fno-builtin'
'-funwind-tables' '-Wall' '-Wstrict-prototypes' '-Wshadow' '-Wundef' '-Os'
'-fno-strict-aliasing' '-fomit-frame-pointer' '-fno-strength-reduce'
'-mcpu=cortex-m3' '-mthumb' '-mfloat-abi=soft' '-isystem'
'/root/Nuttx/nuttx/include' '-D__NuttX__' '-D__KERNEL__' '-pipe' '-I'
'/root/Nuttx/apps/include' ./myapp_main.c
make[2]: *** [/root/Nuttx/apps/Application.mk:232: .depend] Error 1
make[2]: Leaving directory '/root/Nuttx/apps/examples/myapp'
make[1]: *** [Makefile:63: /root/Nuttx/apps/examples/myapp_depend] Error 2
make[1]: Leaving directory '/root/Nuttx/apps'
make: *** [tools/Makefile.unix:473: pass2dep] Error 2
```
1 - https://nuttx.apache.org/docs/latest/quickstart/install.html#toolchain
## Impact
Build fail.
## Testing
Build the project with target mbed:sh
``` ./tool/configure.sh mbed:nsh
make
...
make[1]: Entering directory '/root/Nuttx/nuttx/arch/arm/src'
make[2]: Entering directory
'/root/Nuttx/nuttx/boards/arm/lpc17xx_40xx/mbed/src'
CC: lpc17_40_boot.c
CC: lpc17_40_leds.c
CC: lpc17_40_dac.c
CC: lpc17_40_appinit.c
AR (create): libboard.a lpc17_40_boot.o lpc17_40_leds.o lpc17_40_dac.o
lpc17_40_appinit.o
make[2]: Leaving directory
'/root/Nuttx/nuttx/boards/arm/lpc17xx_40xx/mbed/src'
LD: nuttx
make[1]: Leaving directory '/root/Nuttx/nuttx/arch/arm/src'
CP: nuttx.bin
```
I got a successful build.
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