ESP-IDF V4.0, "undefined reference to" when working with multiple src files inside main

[leofabri]

Hi,
I'm facing a problem when I try to compile an existing project which I'm basically trying to readapt to work with the new version of ESP-IDF V4.0 (the previous one was V3.3).
I noticed that the new development environment uses CMake in order to get the app running so, maybe my "inexperience" is the problem.

When I submit idf.py build flash I get these compilation errors:

app_main.cpp

Code: Select all

FAILED: app.elf 
cmd.exe /C "cd . && C:\Users\leofa\.espressif\tools\xtensa-esp32-elf\esp-2019r2-8.2.0\xtensa-esp32-elf\bin\xtensa-esp32-elf-g++.exe --sysroot=c:\development\esp/../xtensa-esp32-elf/xtensa-esp32-elf  -mlongcalls -Wno-frame-address  -nostdlib @CMakeFiles\app.elf.rsp  -o app.elf  && cd ."
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0xc): undefined reference to `MyConfig'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0x14): undefined reference to `MyCommandApp'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0x24): undefined reference to `AddTaskToMap(void*)'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0x28): undefined reference to `AppConfig::mount()'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0x2c): undefined reference to `AppCommandApp::ConfigureLogging()'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj):(.literal.app_main+0x30): undefined reference to `Housekeeping::Housekeeping()'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(app_main.cpp.obj): in function `app_main':
C:\development\app\build/../main/app_main.cpp:56: undefined reference to `AddTaskToMap(void*)'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\development\app\build/../main/app_main.cpp:59: undefined reference to `AppConfig::mount()'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\development\app\build/../main/app_main.cpp:62: undefined reference to `AppCommandApp::ConfigureLogging()'
c:/users/leofa/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\development\app\build/../main/app_main.cpp:68: undefined reference to `Housekeeping::Housekeeping()'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

Unfortunately, I can't provide many details about the code in question, but basically I have this structure inside of main:

- CMakeLists.h
- components
- main
-- app_config.cpp
-- app_config.h
-- app_housekeeping.cpp
-- app_housekeeping.h
-- app_commands.cpp
-- app_commands.h
-- app_main.cpp
-- CMakeLists.txt
-- component.mk

CMakeLists.txt outside "main":

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cmake_minimum_required(VERSION 3.5)

set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

set(MDF_VER command bash -c "cd $ENV{MDF_PATH} && git describe --always --tags --dirty")
#CPPFLAGS := -D MDF_VER=\"$(MDF_VER)\"

set(EXTRA_COMPONENT_DIRS $ENV{MDF_PATH}/components $ENV{MDF_PATH}/components/third_party)
#set(EXTRA_COMPONENT_DIRS ${EXTRA_COMPONENT_DIRS} )
message(STATUS "EXTRA_COMPONENT_DIRS: ${EXTRA_COMPONENT_DIRS}")

set(CMAKE_SYSROOT $ENV{IDF_PATH}/../xtensa-esp32-elf/xtensa-esp32-elf)

include($ENV{IDF_PATH}/tools/cmake/project.cmake)

project(app)

CMakeLists.txt inside "main":

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idf_component_register(SRCS "app_main.cpp"
                    INCLUDE_DIRS ".")

Since the problem is at the very beginning of app_main.cpp (right when I call the external functions and classes) I do believe that the problem could be potentially related to CMakeLists.txt that isn't "seeing" those other files inside of main.

Some help would be very appreciated. Thank you in advance

[boarchuz]

You need to manually list your source files for main component:

idf_component_register(SRCS "app_main.cpp" "app_config.cpp" "app_housekeeping.cpp" ... etc

[leofabri]

You need to manually list your source files for main component:

idf_component_register(SRCS "app_main.cpp" "app_config.cpp" "app_housekeeping.cpp" ... etc

Thank you so much. I feel like I should have noticed that by myself but I didn't