Re: Handling flat_namespace on 10.10+

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 <[email protected]> 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 <[email protected]> wrote:
>>
>>
>>> On Apr 28, 2015, at 09:41, Alexander Hansen <[email protected]> wrote:
>>>
>>>
>>>> On Apr 28, 2015, at 09:36, Jack Howarth <[email protected]> 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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