Re: need help debugging wierd dlopen failure

2016-09-20 Thread Frank Goenninger 
Jim,

loading a specific version of a shared library requires two things:

a.  Use absolute path to the library in the cffi lib spec
b.  Make sure the dependencies (see output of otool -L ) (the paths to the 
dependencies) are at the beginning of the paths set in the environment variable 
DYLD_LIBRARY_PATH. 

Best
Frank

--
  Frank Gönninger
  DG1SBG
  Consequor Consulting AG
  

> Am 20.09.2016 um 16:46 schrieb Jim Newton :
> 
> Hi Frank, thanks for the information.  If you always use /usr/local/lib then 
> what do you do when you need to run two different independent applications 
> which have different requirements?
> 
>> On Tue, Sep 20, 2016 at 3:44 PM, Frank Goenninger  wrote:
>> Am 20.09.2016 um 15:32 schrieb Luís Oliveira :
>> >
>> > On Tue, Sep 20, 2016 at 10:53 AM, Jim Newton  wrote:
>> >> CL-USER> (cffi::list-foreign-libraries)
>> >> (...
>> >> #> >>   :LIBCAIRO #P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.dylib" 
>> >> (truename=#P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.2.dylib")>)
>> >> CL-USER>
>> >>
>> >> However, when I attempt to load libgdk-x11-2.0.0.dylib it complains that 
>> >> it cannot find a particular symbol in /usr/local/lib/libcairo.dylib.  Why 
>> >> is it complaining about /usr/local/lib/libcairo.dylib?
>> >
>> > Most of those dylibs are symlinks and libgdk may depend on a name
>> > which exists in /usr/local/lib but not /usr/local/Cellar, maybe? ldd
>> > can tell you what a given dylib depends on.
>> 
>> As Jim is on macOS there is no ldd. The command to use is
>> 
>> otool -L /usr/local/lib//libcairo.dylib
>> 
>> Seeing that Jim uses homebrew to install Cairo it is worth mentioning that 
>> brew install … also generates (normally) an entry in /usr/local/lib . That 
>> is why I always stick to using /usr/local/lib/libxyz.dylib paths when I want 
>> to ensure a particular library to be loaded.
>> 
>> Best,
>>Frank
>> 
>> 
>> 
>

Re: need help debugging wierd dlopen failure

2016-09-20 Thread Jim Newton 
Hi Frank, thanks for the information.  If you always use /usr/local/lib
then what do you do when you need to run two different independent
applications which have different requirements?

On Tue, Sep 20, 2016 at 3:44 PM, Frank Goenninger  wrote:

> Am 20.09.2016 um 15:32 schrieb Luís Oliveira :
> >
> > On Tue, Sep 20, 2016 at 10:53 AM, Jim Newton 
> wrote:
> >> CL-USER> (cffi::list-foreign-libraries)
> >> (...
> >> # >>   :LIBCAIRO #P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.dylib"
> (truename=#P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.2.dylib")>)
> >> CL-USER>
> >>
> >> However, when I attempt to load libgdk-x11-2.0.0.dylib it complains
> that it cannot find a particular symbol in /usr/local/lib/libcairo.dylib.
> Why is it complaining about /usr/local/lib/libcairo.dylib?
> >
> > Most of those dylibs are symlinks and libgdk may depend on a name
> > which exists in /usr/local/lib but not /usr/local/Cellar, maybe? ldd
> > can tell you what a given dylib depends on.
>
> As Jim is on macOS there is no ldd. The command to use is
>
> otool -L /usr/local/lib//libcairo.dylib
>
> Seeing that Jim uses homebrew to install Cairo it is worth mentioning that
> brew install … also generates (normally) an entry in /usr/local/lib . That
> is why I always stick to using /usr/local/lib/libxyz.dylib paths when I
> want to ensure a particular library to be loaded.
>
> Best,
>Frank
>
>
>
>

Re: need help debugging wierd dlopen failure

2016-09-20 Thread Frank Goenninger 
Am 20.09.2016 um 15:32 schrieb Luís Oliveira :
> 
> On Tue, Sep 20, 2016 at 10:53 AM, Jim Newton  wrote:
>> CL-USER> (cffi::list-foreign-libraries)
>> (...
>> #>   :LIBCAIRO #P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.dylib" 
>> (truename=#P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.2.dylib")>)
>> CL-USER>
>> 
>> However, when I attempt to load libgdk-x11-2.0.0.dylib it complains that it 
>> cannot find a particular symbol in /usr/local/lib/libcairo.dylib.  Why is it 
>> complaining about /usr/local/lib/libcairo.dylib?
> 
> Most of those dylibs are symlinks and libgdk may depend on a name
> which exists in /usr/local/lib but not /usr/local/Cellar, maybe? ldd
> can tell you what a given dylib depends on.

As Jim is on macOS there is no ldd. The command to use is

otool -L /usr/local/lib//libcairo.dylib

Seeing that Jim uses homebrew to install Cairo it is worth mentioning that brew 
install … also generates (normally) an entry in /usr/local/lib . That is why I 
always stick to using /usr/local/lib/libxyz.dylib paths when I want to ensure a 
particular library to be loaded.

Best,
   Frank





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Re: need help debugging wierd dlopen failure

2016-09-20 Thread Luís Oliveira 
On Tue, Sep 20, 2016 at 10:53 AM, Jim Newton  wrote:
> CL-USER> (cffi::list-foreign-libraries)
> (...
>  #:LIBCAIRO #P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.dylib" 
> (truename=#P"/usr/local/Cellar/cairo/1.12.16_1/lib/libcairo.2.dylib")>)
> CL-USER>
>
> However, when I attempt to load libgdk-x11-2.0.0.dylib it complains that it 
> cannot find a particular symbol in /usr/local/lib/libcairo.dylib.  Why is it 
> complaining about /usr/local/lib/libcairo.dylib?

Most of those dylibs are symlinks and libgdk may depend on a name
which exists in /usr/local/lib but not /usr/local/Cellar, maybe? ldd
can tell you what a given dylib depends on.

Cheers,

-- 
Luís Oliveira
http://kerno.org/~luis/