How to enable GCOV coverage in ESP-IDF

Thu, 24 Jul 2025 09:35:45 +0000

I want to enable the GCOV code coverage for my unit tests. I work in VSCode IDE and I am following their instructions to get the coverage working. But the ESP-IDF does not recognize the app_trace configuration parameters somehow and if I build the test project, I get the following errors:

Loading defaults file /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults...
/disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults:5 CONFIG_ESP_TASK_WDT was replaced with CONFIG_ESP_TASK_WDT_INIT
warning: unknown kconfig symbol 'APPTRACE_DEST_UART' assigned to 'y' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_DEST_NONE' assigned to 'n' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_ENABLE' assigned to 'y' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_LOCK_ENABLE' assigned to 'y' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_ONPANIC_HOST_FLUSH_TMO' assigned to '-1' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_POSTMORTEM_FLUSH_THRESH' assigned to '0' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_PENDING_DATA_SIZE_MAX' assigned to '0' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults
warning: unknown kconfig symbol 'APPTRACE_GCOV_ENABLE' assigned to 'y' in /disk/Projeler/ESP-Components/relay_chn/test_apps/sdkconfig.defaults

Here is my sdkconfig.defults file

# Disable task WDT for tests
CONFIG_ESP_TASK_WDT_INIT=n

# Relay Channel Driver Default Configuration for Testing
# Keep this as short as possible for tests
CONFIG_RELAY_CHN_OPPOSITE_INERTIA_MS=200
CONFIG_RELAY_CHN_COUNT=2
CONFIG_RELAY_CHN_ENABLE_TILTING=y

# App Trace config
CONFIG_APPTRACE_DEST_JTAG=y
CONFIG_APPTRACE_ENABLE=y
CONFIG_APPTRACE_LOCK_ENABLE=y
CONFIG_APPTRACE_ONPANIC_HOST_FLUSH_TMO=-1
CONFIG_APPTRACE_POSTMORTEM_FLUSH_THRESH=0
CONFIG_APPTRACE_PENDING_DATA_SIZE_MAX=0
CONFIG_APPTRACE_GCOV_ENABLE=y

And here is my test_apps/main/CMakeLists.txt

# === These files must be included in any case ===
set(srcs "test_common.c"
         "test_app_main.c"
         "test_relay_chn_core.c"
         "test_relay_chn_listener.c")

if(CONFIG_RELAY_CHN_ENABLE_TILTING)
    list(APPEND srcs "test_relay_chn_tilt.c")
endif()

message(STATUS "srcs=${srcs}")

# In order for the cases defined by `TEST_CASE` to be linked into the final elf,
# the component can be registered as WHOLE_ARCHIVE
idf_component_register(
    SRCS ${srcs}
    INCLUDE_DIRS "."
    REQUIRES unity relay_chn app_trace
    WHOLE_ARCHIVE
)

What am I missing?

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