CMakeLists.txt

# The following lines of boilerplate have to be in your project's CMakeLists
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_definitions(
        -DRAPIDJSON_ALLOCATOR_DEFAULT_CHUNK_CAPACITY=4096 # rapidjson
        -DRAPIDJSON_HAS_STDSTRING=1 # rapidjson
        -Wno-unused-local-typedefs
        # https://stackoverflow.com/questions/22931147/stdisinf-does-not-work-with-ffast-math-how-to-check-for-infinity
        # -ffast-math
        -ffast-math -fno-finite-math-only
)

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

# Create a SPIFFS image from the contents of the 'spiffs_image' directory
# that fits the partition named 'storage'. FLASH_IN_PROJECT indicates that
# the generated image should be flashed when the entire project is flashed to
# the target with 'idf.py -p PORT flash'.

# copy spiffs files to build folder
add_custom_target(copy-files ALL DEPENDS ${CMAKE_SOURCE_DIR}/spiffs_image
        COMMAND ${CMAKE_COMMAND} -E copy_directory
        ${CMAKE_SOURCE_DIR}/spiffs_image
        ${CMAKE_BINARY_DIR}/spiffs_image
        )
# and create backup file structure (sometimes when the ESP's power is interrupted during flash writes, the SPIFFS file gets corrupted)
add_custom_target(copy-files-backup ALL DEPENDS ${CMAKE_SOURCE_DIR}/spiffs_image
        COMMAND ${CMAKE_COMMAND} -E copy_directory
        ${CMAKE_SOURCE_DIR}/spiffs_image/data
        ${CMAKE_BINARY_DIR}/spiffs_image/dbup
        )

spiffs_create_partition_image(storage ${CMAKE_BINARY_DIR}/spiffs_image FLASH_IN_PROJECT)