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Re: How to make a program look for dylibs other than /usr/local/lib?
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Re: How to make a program look for dylibs other than /usr/local/lib?

  • Subject: Re: How to make a program look for dylibs other than /usr/local/lib?
  • From: "parag vibhute" <email@hidden>
  • Date: Sat, 8 Dec 2007 23:14:51 +0530
Sorry  I forgot to write correct compile line. Compile line written in earlier mail is for creating executable file. Actual compilation line is  as follows:

g++4.0 -w -Wall -arch i386 -I/Deveoper/SDKsMacOSX10.4u.sdk/usr/include/gcc/darwin/4.0/c++ -isystem /Developer/SDKs/MacOSX10.4u.sdk -c -I../../inc -o Testing.o Testing.cpp


Please reply.
Thanks.


On Dec 8, 2007 10:36 PM, parag vibhute <email@hidden> wrote:
In first scenario, following is code:

CManager::iterator itr;

//some code to assign value to itr

CTime *tm;   // CTime is a class defined by dynamic library creator
tm=(CTime *)handleCTimeobjcreate( );//create CTime object
res= (*itr)->Getdatafiletm(*tm);
printf("Timing=====%d\n",(*tm).month());   //header file CTime.h
mentions to have void month() const; method of class CTime)

Following is compile line:

g++-4.0 -g -o test_i386 Testing.o -lstdc++ -fexception -arch i386
-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk

I get following error:

/usr/bin/ld: Undefined symbols:
OPT::CTime::month() const

Please note I am not dynamic library(libopbx.dylib) creator & I am
just using it. In above compilation line, I also tried to change in
compiler from g++ to gcc when I made extension of file from cpp to mm
but no use.


Peter, not understood ur statement regarding second scenario "Setting
DYLD_LIBRARY_PATH to / is both strange and unnecessary". Bcoz after
setting it only, I was able to run the app successful in second
scenario.



Thanks,
Palav




On 12/7/07, Peter O'Gorman <email@hidden> wrote:
> parag vibhute wrote:
> > I am also facing certain type of problem. I tried two ways. First
> > scenario is as follows
> > 1. Dynamic library's install name is /usr/lib/libopbx.dylib.
> > 2. I set extension of source file (which is using that dynamic library)
> > to cpp & placed that dynamic library at executable path.
> > 3. In cpp file I am loading dynamic library at run time i.e. using
> > dlopen, dlclose etc. functions.(i.e. treating dynamic library is dynamic
> > dependant library)
> > 3. Compilation is successful.
> > 4. Now if I change extension to mm, it gives me error.
> > 5. But with cpp, there is one function for which I get error
> > "/usr/bin/ld: Undefined symbols:"
>
> Sorry, but there is not enough information here to give you a reasonable
> guesstimate about what went wrong. What are the undefined symbols? Can
> you post a short code snippit that demonstrates the problem? Could you
> show the build log?
>
> >
> > Second scenario is
> > 1. Dynamic library's install name is /usr/lib/libopbx.dylib.
> > 2. I set extension of source file (which is using that dynamic library)
> > to mm & placed that dynamic library at root("/") path.
> > 3. Now this time I am loading dyamic library at launch of my application
> > using -l flag of gcc(i.e. treating dynamic library as dependant library)
> > 3. Compilation is successful.
> > 4. Now I set value of DYLD_LIBRARY_PATH to "/"
> > 5. Run the code, it was successful.
> > 4. And also I do not get error for the function which I was getting in
> > first scenario.
> >
> > I am using Xcode 2.4.1 to build the application.
> >
> > My requirement is to avoid setting value of variable DYLD_LIBRARY_PATH;
> > for that I require to follow first path but in that case I am getting
> > error for a certain function. What should I do?
>
> Setting DYLD_LIBRARY_PATH to / is both strange and unnecessary. I assume
> that you want to have the library somewhere relative to the executable,
> in which case you should read earlier posts and manpages.
>
> Peter
> --
> Peter O'Gorman
> http://pogma.com
>


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References: 
 >How to make a program look for dylibs other than /usr/local/lib? (From: Graham Reitz <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: Peter O'Gorman <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: Graham Reitz <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: Peter O'Gorman <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: "parag vibhute" <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: Peter O'Gorman <email@hidden>)
 >Re: How to make a program look for dylibs other than /usr/local/lib? (From: "parag vibhute" <email@hidden>)

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