On 2015-09-22 07:30, Gianfranco Costamagna wrote: > Hi Thomas, > > > >> And why does it still work when i install back 1.4.0-2 ? > > > > > well, if -2 and -3 didn't change symbols (e.g. you didn't patch the source > code), > why shouldn't it work? > > (I'm not sure to know how exactly the build.ids are mapped to the binary > code, but I guess > they work as long as the symbols table don't change) >
The debug package needs a strictly equal dependency on the original
package, such as: "foo (= ${binary:Version})". That is orthogonal to
the usage of build-ids (that is, you must use the strictly equal with or
without build-id based debug paths).
As for the build-id and how it is computed. It is based on the
internals of the ELF binary including but not limited to:
* The path where the binaries were compiled
* The options given to gcc when compiled
* Time and day, if such are included in the code (__DATE__ macros
and such).
Thanks,
~Niels
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