Hello everyone,
I'm setting up a new build targeting an embedded platform (LM32) and
trying to integrate a CRC32 into the resulting ELF. I have previously
done this using plain Makefiles with the following steps (pseudo code):
target.elf: <obj-files>
link <obj-files> --symbol CRC_VALUE=0 intermediate.elf
objcopy --binary intermediate.elf intermediate.bin
link <obj-files> --symbol CRC_VALUE=`crc32 intermediate.bin` target.elf
rm intermediate.bin
Now I would like to achieve the same thing with CMake. I'm using
add_executable with multiple targets. The end of my CMakeLists.txt looks
like this, where F_GEN contains generic source files and F__* source
files specific for that variant of the build:
# [...defining of cross compiler, and source files, some compile flags,
etc...]
# Educate the linker
add_link_options(
-nostartfiles
-nodefaultlibs
-nostdlib
-Wl,--gc-sections
-T ${CMAKE_SOURCE_DIR}/${P_SRC}/romram.ld
-Wl,--defsym=CRC_VALUE=0
-Wl,--defsym=_start=0
)
# DOM v2 target
add_executable( clb_v2_dom.elf ${F_GEN} ${F__DOM} )
target_compile_definitions(clb_v2_dom.elf PUBLIC -DDOM -DCLBV2 )
# BASE v2 target
add_executable( clb_v2_base.elf ${F_GEN} ${F__BASE} )
# TODO migrate define 'DUBASE' -> 'BASE'
target_compile_definitions(clb_v2_base.elf PUBLIC -DDUBASE -DBASE -DCLBV2)
# Golden v2 target
add_executable( clb_v2_golden.elf ${F_GEN} ${F__GLD} )
target_compile_definitions( clb_v2_golden.elf PUBLIC -DGOLDEN -DCLBV2 )
==
As you can see CRC_VALUE is now simply defined 0 for every target. Which
works well for compiling but during runtime poses a problem to the ROM
verification procedure. What would a 'proper' way be of adding a CRC to
an ELF file be using CMake, and be different for each target. Any help
is welcome!
Kind regards,
Vincent
--
National Institute for Subatomic Physics Nikhef
Department of Computer Technology
Science Park 105
1098 XG AMSTERDAM
tel. : +31 (0)20 592 2032
e-mail: v.van.beve...@nikhef.nl
site : http://www.nikhef.nl/~vincentb
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