There are a couple of trivial tests for flat_namespace linkage.
% /Library/Developer/CommandLineTools/usr/bin/dyldinfo -bind
/sw/lib/openmpi/libmpi.1.dylib
bind information:
segment section address type addend dylib symbol
__DATA __got 0x001CC000 pointer 0 flat-namespace
_ADIOI_DFLT_ERR_HANDLER
__DATA __got 0x001CC008 pointer 0 flat-namespace
_ADIOI_Datarep_head
or
% otool -hv /sw/lib/openmpi/libmpi.1.dylib
/sw/lib/openmpi/libmpi.1.dylib:
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
MH_MAGIC_64 X86_64 ALL 0x00 DYLIB 17 1888
DYLDLINK NO_REEXPORTED_DYLIBS
where the absence of TWOLEVEL indicates flat_namespace linkage...
% otool -hvi /sw/lib/libfftw3.3.dylib
/sw/lib/libfftw3.3.dylib:
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
MH_MAGIC_64 X86_64 ALL 0x00 DYLIB 15 1768
NOUNDEFS DYLDLINK TWOLEVEL NO_REEXPORTED_DYLIBS
On Tue, Apr 28, 2015 at 1:46 PM, TheSin <the...@southofheaven.org> wrote:
> if we upgrade to my PR I think we could use the symbols files in the dpkg
> info die to find flat libs, I’m not 100% certain as I’d need an example to
> test, but if flat_namespace creates a symbol it would be possible, it could
> even be a trigger to process and sort all libs known to use flat_namespace,
> then just check that. Either options is pretty easy to do.
> ---
> TS
> http://www.southofheaven.org/
> Life begins and ends with chaos, live between the chaos!
>
>> On Apr 28, 2015, at 11:14 AM, Alexander Hansen <alexanderk.han...@gmail.com>
>> wrote:
>>
>>
>>> On Apr 28, 2015, at 09:41, Alexander Hansen <alexanderk.han...@gmail.com>
>>> wrote:
>>>
>>>
>>>> On Apr 28, 2015, at 09:36, Jack Howarth <howarth.at.f...@gmail.com> wrote:
>>>>
>>>> Looking at the code, it seem we would have to do this check in sub
>>>> validate_dpkg_file and use global boolean called
>>>> skip_flat_namespace_check or such. In validate_dpkg_file, regex check
>>>> $dpkg_filename against both openmpi-shlibs_*.deb or openmpi_*.deb. If
>>>> either match, set skip_flat_namespace_check to true
>>>> and otherwise to false. Then add skip_flat_namespace_check as a
>>>> conditional in the...
>>>>
>>>> if (open (OTOOL, "$otool -hv '$dylib_temp' |")) {
>>>>
>>>> state that controls the flat namespace checks on each file.
>>>>
>>>
>>> As Daniel said, adding a new .info field (if that’s what you mean by global
>>> boolean) involves adding on another hack to the .deb control field for 2
>>> packages out of more than 10000. For something that end-users never see.
>>>
>>> It’d be easier just to get Brendan to whitelist the packages for his auto
>>> builder.
>>> --
>>> Alexander Hansen, Ph.D.
>>> Fink User Liaison
>>>
>>
>> Oh wait, I re-parsed that, so I think I understand better what you’re
>> getting at. And I don’t think it will work as intended, since I believe
>> $validate_dpkg_file is run only on actual .debs and not on root directories
>> before they get packed.
>>
>> In principle we could just check individual dylib’s names against a
>> whitelist of filename patterns and if they match we can skip the
>> flat_namespace check via a ‘next’.
>>
>> --
>> Alexander Hansen, Ph.D.
>> Fink User Liaison
>>
>>
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