espressif: Add CMake build paths for Xtensa ESP32 chips and esp32c3-legacy.

[arjav1528]

Note: Please adhere to Contributing Guidelines.

Summary

Extends the NuttX CMake flow for Espressif targets that were mainly covered by Make before.

• Xtensa (arch/xtensa): Shared Espressif Xtensa CMake under arch/xtensa/src/common/espressif/, plus chip CMakeLists.txt / hal_*.cmake for ESP32, ESP32-S2, and ESP32-S3 (HAL includes via ESP_HAL_3RDPARTY_REPO / CHIP_SERIES).
• Boards (boards/xtensa): CMakeLists.txt for common, common/src, and esp32-devkitc, esp32s2-saola-1, esp32s3-devkit.
• Legacy RISC-V: CMake for esp32c3-legacy and esp32c3-legacy-devkit (hal_esp32c3-legacy.cmake and board/common CMake).

Additive build-system files only; no runtime OS logic changes in this PR.

Impact

• Users: CMake builds for the listed Xtensa boards and esp32c3-legacy-devkit gain explicit wiring; Make builds are unaffected by these files.
• Build / hardware: As above; no Kconfig changes in this scope.
• Docs / security / compatibility: No doc changes; no new security surface; backward compatible for Make users.

Testing

Hardware: I do not have Espressif boards available, so I could not flash images, exercise the serial console, or run on-target tests (e.g. NSH, drivers).

Build / CI: This change is CMake-only (new CMakeLists.txt / .cmake wiring). Please rely on NuttX CI and/or a maintainer/local build with the documented Espressif toolchains and esp-hal-3rdparty checkout for full configure + link verification, for example:

cd nuttx
cmake -B build -DBOARD_CONFIG=esp32-devkitc:nsh -GNinja
cmake --build build

[simbit18]

Hi @arjav1528 , I've marked PR as a draft.

Hi @fdcavalcanti @tmedicci @eren-terzioglu, can you run some tests?

[simbit18]

A quick test I ran

Nuttx repository: arjav1528/nuttx
    Nuttx branch: dev-issue-15839
 Apps repository: apache/nuttx-apps
     Apps branch: master
          Config: esp32-devkitc:nsh
    Build system: all

Nuttx repository: arjav1528/nuttx
    Nuttx branch: dev-issue-15839
 Apps repository: apache/nuttx-apps
     Apps branch: master
          Config: esp32s2-kaluga-1:nsh
    Build system: all

Same issue

Configuring incomplete, errors occurred!

-- nuttx_add_subdirectory: Skipping cxx-oot-build
-- Initializing NuttX
Loaded configuration '/github/workspace/sources/nuttx/build/.config.compressed'
Minimal configuration saved to '/github/workspace/sources/nuttx/build/defconfig.tmp'
  Select HOST_LINUX=y
--   CMake:  3.26.0
--   Ninja:  1.10.1
--   Board:  esp32-devkitc
--   Config: nsh
--   Appdir: /github/workspace/sources/apps
-- The C compiler identification is GNU 12.3.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /tools/ccache/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- NuttX Host Tools
-- CMake C compiler: GNU
-- CMake system name: Linux
-- CMake host system processor: x86_64
   TOOLS_DIR path is "/github/workspace/sources/nuttx"
   HOST = Linux
-- Configuring done (0.4s)
-- Generating done (0.0s)
-- Build files have been written to: /github/workspace/sources/nuttx/build/bin_host
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
-- The ASM compiler identification is unknown
-- Found assembler: xtensa-esp32-elf--gcc
CMake Error at CMakeLists.txt:475 (project):
  The CMAKE_C_COMPILER:

    xtensa-esp32-elf--gcc

  is not a full path and was not found in the PATH.

  Tell CMake where to find the compiler by setting either the environment
  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
  the compiler, or to the compiler name if it is in the PATH.


CMake Error at CMakeLists.txt:475 (project):
  The CMAKE_CXX_COMPILER:

    xtensa-esp32-elf--g++

  is not a full path and was not found in the PATH.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.


CMake Error at CMakeLists.txt:475 (project):
  The CMAKE_ASM_COMPILER:

    xtensa-esp32-elf--gcc

  is not a full path and was not found in the PATH.

  Tell CMake where to find the compiler by setting either the environment
  variable "ASM" or the CMake cache entry CMAKE_ASM_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.


-- Warning: Did not find file Compiler/-ASM
-- Configuring incomplete, errors occurred!

Hi @arjav1528 , as you’re using macOS, I’d recommend you run some tests with this #18568 tool before adding a new PR.

Workflow -> Manually Compiling with Make or Cmake for test

@arjav1528 Please also include full build logs !

[linguini1]

Please take a look at the CMake support PRs from @simbit18 to see an example of the test logs you should include.

[cederom]

Thank you @arjav1528 please provide build and runtime test logs as required by Contributing Guide, this change impacts build of many different chips/boards and preferably requires verification on the real world hardware or at least simulator.

@tmedicci @fdcavalcanti could you please help in verification? :-)

[maxikrie]

@arjav1528 Thank you for your work. It would be such a relief to also have a CMake build path for ESP32 platforms.