cmake: Cleanup of linking flags and improving structure

[tejlmand]

I have noticed that several link flags are handled by populating:
set(zephyr_lnk
${LINKERFLAGPREFIX},-Map=${PROJECT_BINARY_DIR}/${KERNEL_MAP_NAME}
-u_OffsetAbsSyms
-u_ConfigAbsSyms
${E_KERNEL_ENTRY}
${LINKERFLAGPREFIX},--start-group
${LINKERFLAGPREFIX},--whole-archive
${ZEPHYR_LIBS_PROPERTY}
${LINKERFLAGPREFIX},--no-whole-archive
kernel
${OFFSETS_O_PATH}
${LINKERFLAGPREFIX},--end-group
${LIB_INCLUDE_DIR}
-L${PROJECT_BINARY_DIR}
${TOOLCHAIN_LIBS}
)

Instead it is possible to add those flags to the module,e.g. offset / kernel and then the target which links to offset / kernel will obtain those flags through CMake dependencies.
Thus, it is not needed to maintain a separate list.
As example:
-u_OffsetAbsSyms and -u_ConfigAbsSyms are required by the offset library.
${E_KERNEL_ENTRY} ${TOOLCHAIN_LIBS} on the kernel library

[zephyrbot]

Hi @tejlmand,

This issue, marked as an Enhancement, was opened a while ago and did not get any traction. It was just assigned to you based on the labels. If you don't consider yourself the right person to address this issue, please re-assing it to the right person.

Please take a moment to review if the issue is still relevant to the project. If it is, please provide feedback and direction on how to move forward. If it is not, has already been addressed, is a duplicate, or is no longer relevant, please close it with a short comment explaining the reason.

@tejlmand you are also encouraged to help moving this issue forward by providing additional information and confirming this request/issue is still relevant to you.

Thanks!