NimBLE SSP Server example fails to build on Windows (IDFGH-6673)

[TonyWu98]

Environment

• Development Kit: none
• Module or chip used: ESP32-WROOM-32
• IDF version (run git describe --tags to find it): v4.4
• Build System: idf.py
• Compiler version (run xtensa-esp32-elf-gcc --version to find it): xtensa-esp32-elf-gcc (crosstool-NG esp-2021r2-patch2) 8.4.0
• Operating System: Windows 10
• (Windows only) environment type: ESP Command Prompt
• Using an IDE?: No
• Power Supply: external 5V

Problem Description

NimBLE SSP Server example fails to build.

Expected Behavior

Successful build of the project

Actual Behavior

Console output:

C:\Users\TonyWu\Desktop\esp-idf\examples\bluetooth\nimble\ble_spp\spp_server>idf.py build
Executing action: all (aliases: build)
Running cmake in directory c:\users\tonywu\desktop\esp-idf\examples\bluetooth\nimble\ble_spp\spp_server\build
Executing "cmake -G Ninja -DPYTHON_DEPS_CHECKED=1 -DESP_PLATFORM=1 -DIDF_TARGET=esp32 -DCCACHE_ENABLE=1 c:\users\tonywu\desktop\esp-idf\examples\bluetooth\nimble\ble_spp\spp_server"...
-- Found Git: C:/Users/TonyWu/.espressif/tools/idf-git/2.30.1/cmd/git.exe (found version "2.30.1.windows.1")
-- ccache will be used for faster recompilation
-- The C compiler identification is GNU 8.4.0
-- The CXX compiler identification is GNU 8.4.0
-- The ASM compiler identification is GNU
-- Found assembler: C:/Users/TonyWu/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch2-8.4.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcc.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Users/TonyWu/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch2-8.4.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Users/TonyWu/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch2-8.4.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-g++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Building ESP-IDF components for target esp32
-- Project sdkconfig file C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig
Loading defaults file C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig.defaults...
C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig:423 CONFIG_ESP32_REDUCE_PHY_TX_POWER was replaced with CONFIG_ESP_PHY_REDUCE_TX_POWER
C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig:569 CONFIG_ESP_SYSTEM_PD_FLASH was replaced with CONFIG_ESP_SLEEP_POWER_DOWN_FLASH
C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig:624 CONFIG_ESP32_PHY_CALIBRATION_AND_DATA_STORAGE was replaced with CONFIG_ESP_PHY_CALIBRATION_AND_DATA_STORAGE
C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig:626 CONFIG_ESP32_PHY_MAX_WIFI_TX_POWER was replaced with CONFIG_ESP_PHY_MAX_WIFI_TX_POWER
C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/sdkconfig:627 CONFIG_ESP32_PHY_MAX_TX_POWER was replaced with CONFIG_ESP_PHY_MAX_TX_POWER
-- Found PythonInterp: C:/Users/TonyWu/.espressif/python_env/idf4.4_py3.8_env/Scripts/python.exe (found version "3.8.9")
-- Could NOT find Perl (missing: PERL_EXECUTABLE)
-- App "spp_server" version: v4.4
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/build/esp-idf/esp_system/ld/memory.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_system/ld/esp32/sections.ld.in
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.api.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.libgcc.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.newlib-data.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.syscalls.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/esp_rom/esp32/ld/esp32.rom.newlib-time.ld
-- Adding linker script C:/Users/TonyWu/Desktop/esp-idf/components/soc/esp32/ld/esp32.peripherals.ld
CMake Error at ../../../../../tools/cmake/component.cmake:298 (foreach):
  Syntax error in cmake code at

    C:/Users/TonyWu/Desktop/esp-idf/tools/cmake/component.cmake:298

  when parsing string

    C:\Users\TonyWu\Desktop\esp-idf/components

  Invalid character escape '\U'.
Call Stack (most recent call first):
  ../../../../../tools/cmake/component.cmake:472 (__component_add_include_dirs)
  main/CMakeLists.txt:5 (idf_component_register)


-- Configuring incomplete, errors occurred!
See also "C:/Users/TonyWu/Desktop/esp-idf/examples/bluetooth/nimble/ble_spp/spp_server/build/CMakeFiles/CMakeOutput.log".
cmake failed with exit code 1

Steps to reproduce

1. Open ESP-IDF cmd prompt
2. cd ...\esp-idf\examples\bluetooth\nimble\ble_spp
3. idf.py build

Workaround

Changing main/CMakeLists.txt from:

set(srcs "main.c"
        "gatt_svr.c"
        "misc.c")

idf_component_register(SRCS "${srcs}"
                    INCLUDE_DIRS "$ENV{IDF_PATH}/components")

to:

set(srcs "main.c"
        "gatt_svr.c"
        "misc.c")

idf_component_register(SRCS "${srcs}"
                    INCLUDE_DIRS ".")

seems to fix the issue and the example builds and functions as expected. Not sure if this has any side effects.

Logs

CMakeOutput.log

sdkconfig.txt

[rahult-github]

Hi @TonyWu98 ,

Thanks for finding this issue. Will fix this and include it in upcoming release.

Thanks,
Rahul