[CMake] extract GNU build-id

[Gerhard Gappmeier]

Hi all,

I want to extract the GNU build-id which is creates by the linker using
-Wl,--build-id.
In a BASH script I can do it this way:
BUILD_ID=`readelf -n demo.debug | grep "Build ID:" | sed -e
's/.*\([a-f0-9]\{40\}\).*/\1/g'`

But I'm not sure I can do that with CMake.

Actually I'm working on a cmake file which provides me split_debug_info
and install_debug_info functions.
That's what I have currently, but as you can see in the TODOs some parts
are missing at the moment.

# find path to git executable
find_program(OBJCOPY objcopy)
find_program(STRIP strip)
set(SYMBOLDIR "/mnt/symbols")

function(split_debug_info _target)
    get_target_property(filename ${_target} LOCATION)
    add_custom_target(splitdebug
        COMMAND ${OBJCOPY} --only-keep-debug ${filename} ${filename}.debug
        COMMAND ${STRIP} -g ${filename})
endfunction()

function(install_debug_info _target)
    get_target_property(filename ${_target} LOCATION)
    get_filename_component(basename ${filename}.debug NAME)
    # TODO: get BUILDID from ${filename}.debug
    SET(BUILDID "1234567890")
    STRING(SUBSTRING "${BUILDID}" 0 2 BUILDIDPREFIX)
    STRING(SUBSTRING "${BUILDID}" 2 38 BUILDIDSUFFIX)
    # install file in product structure
    add_custom_target(installdebugsymbols
        COMMAND ${CMAKE_COMMAND} -E copy ${filename}.debug
        ${SYMBOLDIR}/${PRODUCTNAME}/${VERSION}/${basename})
    # create symlink in /mnt/symbols/.build-id/nn/nnnnnnnn.debug
    # TODO: ln -s ${SYMBOLDIR}/${PRODUCTNAME}/${VERSION}/${basename}
    #            
${SYMBOLDIR}/.build-id/${BUILDIDPREFIX}/${BUILDIDSUFFIX}.debug
endfunction()



-- 

mit freundlichen Grüßen / best regards

*Gerhard Gappmeier*
ascolab GmbH - automation systems communication laboratory
Tel.: +49 9131 691 123
Fax: +49 9131 691 128
Web: http://www.ascolab.com
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--
*ascolab GmbH*
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