interpreters/berry: Add Berry scripting language

[speccy88]

Summary

• Add Berry as an optional interpreter under apps/interpreters/berry.
• Pin upstream Berry at commit 4db341475df9e9ad18e6741ef978b4c467690e09 and fetch it from the upstream archive during Make/CMake builds.
• Add Makefile, CMake, Kconfig, and NuttX Berry configuration.
• Apply a small default-port patch so Berry reports NuttX in its startup banner and avoids the NuttX optarg macro collision.

Related PRs

• NuttX documentation and sim:berry configuration: sim: Add Berry interpreter configuration nuttx#19224
• Upstream Berry default-port changes: default: Add NuttX host detection berry-lang/berry#539

Impact

• New opt-in config: CONFIG_INTERPRETERS_BERRY.
• Default command: berry.
• Default priority: 100.
• Default stack size: 12288.
• Depends on ARCH_SETJMP_H, LIBC_FLOATINGPOINT, and SYSTEM_SYSTEM.
• Keeps Berry shared-library module loading disabled, so it does not require CONFIG_LIBC_DLFCN.
• Berry object files in the ESP32-C3 USB-console validation build: text=136529 data=0 bss=1004 dec=137533.

Testing

Host validation:

git diff --check -- interpreters/berry

Target build validation was done with current NuttX commit 5feb1c4b8b3fda0bfeccbf49a2be8865169cdfd4, this apps branch, RISC-V GCC 13.2.0, and kconfig-frontends on macOS arm64.

The USB-console profile was used for board testing because esp32c3-devkit:nsh routes NSH to UART0, while this board is attached via /dev/cu.usbmodem101 using ESP32-C3 USB Serial/JTAG.

./tools/configure.sh -a ../nuttx_apps_berry_pr esp32c3-devkit:usbconsole
kconfig-tweak --file .config --enable CONFIG_INTERPRETERS_BERRY \
  --set-str CONFIG_INTERPRETERS_BERRY_PROGNAME berry \
  --set-val CONFIG_INTERPRETERS_BERRY_STACKSIZE 12288 \
  --set-val CONFIG_INTERPRETERS_BERRY_PRIORITY 100
make olddefconfig
make -j8
make flash ESPTOOL_PORT=/dev/cu.usbmodem101 ESPTOOL_BAUD=460800

Build result for that ESP32-C3 image:

Memory region         Used Size  Region Size  %age Used
             ROM:      370348 B         4 MB      8.83%
     iram0_0_seg:       14656 B     321296 B      4.56%
     irom0_0_seg:      215736 B         4 MB      5.14%
     dram0_0_seg:       23168 B     321296 B      7.21%
     drom0_0_seg:      304776 B         4 MB      7.27%
    rtc_iram_seg:          52 B       8168 B      0.64%
rtc_reserved_seg:          0 GB         24 B      0.00%

text=230382 data=44356 bss=283630 dec=558368
nuttx.bin=370312 bytes

Runtime smoke test on ESP32-C3:

NuttShell (NSH)
nsh> berry -v
Berry 1.1.0
nsh> berry -e print(40+2)
42
nsh> berry
Berry 1.1.0 (build in Jun 26 2026, 09:07:01)
[GCC 13.2.0] on NuttX (default)
> import os
> os.exit(0)
nsh>

Companion sim:berry build and smoke test are documented in apache/nuttx#19224.

[acassis]

@speccy88 I will approve, but I agree with @xiaoxiang781216, better to submit these change to berry mainline