netutils/cjson: fix apps path in CMake

[fdcavalcanti]

Summary

• netutils/cjson: fix apps path in CMake

Fix mismatch on apps directory naming when it is cloned under 'nuttx-apps' instead of 'apps'.

It replaces the hardcoded ${CMAKE_BINARY_DIR}/apps directory with ${NUTTX_APPS_BINDIR}.

Impact

Impact on user: No.

Impact on build: Yes, it automatically uses the proper nuttx-apps repository name instead of requiring a hardcoded one.

Impact on hardware: No.

Impact on documentation: No.

Impact on security: No.

Impact on compatibility: No.

Testing

Build any application that requires CJSON. In my case, I used esp32c3-devkit:sta_softap (which CMake support is under test) and it kept failing the build.

Building

• cmake -B build -DBOARD_CONFIG=esp32c3-devkit:sta_softap -GNinja -DNXTMPDIR=on
• cmake --build build

Results

Before changes:

[1685/1783] Building C object apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o
FAILED: apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o 
/home/fdcavalcanti/work/toolchains/riscv-none-elf-gcc/bin/riscv-none-elf-gcc -D__NuttX__ -I/home/fdcavalcanti/nuttxspace1/nuttx-apps/system/argtable3/argtable3/src -I/home/fdcavalcanti/nuttxspace1/nuttx-apps/include -I/home/fdcavalcanti/nuttxspace1/nuttx/build/nuttx-apps/include -isystem /home/fdcavalcanti/nuttxspace1/nuttx/include -isystem /home/fdcavalcanti/nuttxspace1/nuttx/build/include -Os -fno-strict-aliasing -fomit-frame-pointer -fno-common -Wall -Wshadow -Wundef -Wno-attributes -Wno-unknown-pragmas -Wstrict-prototypes -ffunction-sections -fdata-sections -march=rv32imc_zicsr_zifencei -mabi=ilp32 -fdiagnostics-color=always -fmacro-prefix-map=/home/fdcavalcanti/nuttxspace1/nuttx= -fmacro-prefix-map=/home/fdcavalcanti/nuttxspace1/nuttx-apps= -fmacro-prefix-map=/home/fdcavalcanti/nuttxspace1/nuttx/boards/risc-v/esp32c3/esp32c3-devkit= -fmacro-prefix-map=/home/fdcavalcanti/nuttxspace1/nuttx/arch/risc-v/src/esp32c3= @apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o.rsp -MD -MT apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o -MF apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o.d -o apps/CMakeFiles/apps.dir/wireless/wapi/src/util.c.o -c /home/fdcavalcanti/nuttxspace1/nuttx-apps/wireless/wapi/src/util.c
/home/fdcavalcanti/nuttxspace1/nuttx-apps/wireless/wapi/src/util.c:55:10: fatal error: netutils/cJSON.h: No such file or directory
   55 | #include "netutils/cJSON.h"
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.

After changes:

[1644/1779] Building C object apps/CMakeFiles/apps.dir/netutils/dhcpd/dhcpd.c.o
/home/fdcavalcanti/nuttxspace5/nuttx-apps/netutils/dhcpd/dhcpd.c: In function 'dhcpd_allocipaddr':
/home/fdcavalcanti/nuttxspace5/nuttx-apps/netutils/dhcpd/dhcpd.c:519:4: warning: #warning "FIXME: Should check if anything responds to an ARP request or ping" [-Wcpp]
  519 | #  warning "FIXME: Should check if anything responds to an ARP request or ping"
      |    ^~~~~~~
/home/fdcavalcanti/nuttxspace5/nuttx-apps/netutils/dhcpd/dhcpd.c:520:4: warning: #warning "       to verify that there is no other user of this IP address" [-Wcpp]
  520 | #  warning "       to verify that there is no other user of this IP address"
      |    ^~~~~~~
[1779/1779] Running utility command for nuttx_post_build
-- Generate NuttX image (esptool elf2image)
esptool v5.2.0
Creating ESP32-C3 image...
Image has only RAM segments visible. ROM segments are hidden and SHA256 digest is not appended.
Merged 1 ELF section.
Successfully created ESP32-C3 image.
-- Generated: nuttx.bin

[cederom]

Thank you @fdcavalcanti good catch! :-)