Hi,
I am debugging a program running on the FLPR core on the nRF54L15 development board. I need to call a static library (. a file) on the FLPR core. I use the project created by the nRF Connect SDK to generate a static library, and then call it in the main function of the project.
This is the code for generating a static library (.a file) in the CMakeLists.txt file:
target_sources(app PRIVATE
src/flpr_lib_src/flpr_lib_src.c
)
set(LIBRARY_OUTPUT_PATH ${CMAKE_CURRENT_LIST_DIR}/lib)
set(SOURCES
src/flpr_lib_src/flpr_lib_src.c
)
add_library(flpr STATIC ${SOURCES})
And this is the CMakeLists.txt code when I compile the static library (.a file) into hex:
FILE(GLOB app_sources
src/*.c
)
target_sources(app PRIVATE ${app_sources})
target_link_libraries(app PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/lib/libflpr.a
)
Compiling .a file and hex file using NCS2.9.1 integrated with VSCode. The compilation configuration is as follows:
SDK: nRF Connect SDK v2.9.1
Toolchain: nRF Connect SDK Toolchain v2.9.1
Board target: nrf54l15dk/nrf54l15/cpuflpr Nordic Soc
System build(sysbuild): No sysbuild
When compiling the static library(.a file) into hex, the following errors was reported:
"error: ../lib/libflpr.a(flpr_lib_src.c.obj) use 16-byte stack aligned but the output use 4-byte stack aligned"
Recently, when compiling static libraries, I added a compilation option in CMakeLists.txt:: target_compile_options(flpr PRIVATE -mpreferred-stack-boundary=2) to try to change the byte alignment of the static library. However, the following error was reported:“error: '-mpreferred-stack-boundary=2' must be between 3 and 8”. It means that using this method, I can only create static libraries that are aligned with at least 8 bytes.
How should this problem be solved? How can I compile a static library into 4-byte alignment?
If you know how to solve it, please reply to me.
Thank you.
