Seems like the linker just wants to add everything into the flash. Now I just made a link to the csrc folder and added the files in my CMakeLists.txt and it compiles fine. Now the programs are reduce to something like 50+ kbytes

My CMakeLists.xt
`# @file CmakeLists.txt

@brief used to generate the correct makefiles including ucglib

@author Nico Verduin

@Date 22-2-2023

if we use ucglib update the variable below with correct path

set (UCGLIB "../ucglib/csrc/")

give the project the root folder name

cmake_path(GET CMAKE_CURRENT_SOURCE_DIR FILENAME PROJECT_NAME)
string(REPLACE " " "_" ProjectId ${PROJECT_NAME})
project(${PROJECT_NAME})

let's get all the sources

set(PROJECT_SOURCE_DIRS "*.c *.h")

if we use UCG lib add its folders as well

if (DEFINED UCGLIB)
# add UCGLIB sources
set(PROJECT_SOURCE_DIRS ${PROJECT_SOURCE_DIRS} ${UCGLIB}.c ${UCGLIB}.h)
# search in folder
include_directories(${UCGLIB})
endif()

get all the sources and includes from current project dir and UCGLIB

file(GLOB PROJECT_SRC CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIRS})

set dependencies for our firmware

add_executable(${PROJECT_NAME}
main.c
${PROJECT_SRC}
)

enable usb output, disable uart output

pico_enable_stdio_usb(${PROJECT_NAME} 1)
pico_enable_stdio_uart(${PROJECT_NAME} 0)

pull in common dependencies and additional spi hardware support

target_link_libraries(${PROJECT_NAME} pico_stdlib hardware_spi hardware_gpio)

create map/bin/hex file etc.

pico_add_extra_outputs(${PROJECT_NAME})

add url via pico_set_program_url

example_auto_set_url(${PROJECT_NAME})

`

from ucglib.