[fpc-pascal] Getting build ID

Mark Morgan Lloyd markMLl.fpc-pascal at telemetry.co.uk
Sun Oct 25 20:25:01 CET 2015

Mark Morgan Lloyd wrote:
> Andrew Haines wrote:
>> On 10/22/2015 08:08 PM, Mark Morgan Lloyd wrote:
>>> If a program is linked with GNU ld using the --build-id option, how 
>>> can it retrieve the value at runtime?
>> I've never done it but maybe a place to start is use the elfreader 
>> unit in fcl-res to open ParamStr(0) and read the data from the 
>> .note.gnu.build-id section.
> Thanks, I'll take a look. I'm looking for something that I can put as a 
> "magic number" at the bottom of some shared memory, and the build-id is 
> ideal since it can be set to a fixed value during debugging.

If I'm reading things properly I have to reimplement 
TElfResourceReader.Load so I can get a subreader, call the FindSection 
method to get a section index, then do something... I've not worked this 
out yet and would appreciate any hints... to convert the section index 
into an address/length in the file and read the data.

Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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