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Full Discussion: Specifying dynamic library path to linker at compile time
Top Forums Programming Specifying dynamic library path to linker at compile time Post 302882013 by waavman on Friday 3rd of January 2014 02:11:33 PM
Old 01-03-2014
Specifying dynamic library path to linker at compile time
I would like to compile a binary that doesnot depend on LD_LIBRARY_PATH as this binary will be setuid to owner and used by other users and since setuid doesnot support LD_LIBRARY_PATH making it independent of LD_LIBRARY_PATH would be great.

But I am not able to specify the path of the shared libraries to the linker at compile time. I am using gcc compiler 4.1.2 and on Linux OS Red Hat 5.8. I am using the following compile command where /aaa/bbb/lib is the path of the shared library that is used by the binary waitdb.ORACLE called within the binary simple:

Code:
gcc simple.c -Wl,-rpath=/aaa/bbb/lib -o simple

simple.c has nothing but an execvp call to another binary 'waitdb.ORACLE' which uses libuidata.so that is located in /aaa/bbb/lib directory
Contents of simple.c are as follows:

Code:
#include <stdio.h>
int main(int argc, char* argv[])
{
        char* args[3];
        args[0]="/aaa/bbb/bin/waitdb.ORACLE";
        args[1]=NULL;
        printf ("before executing execvp\n");
        execvp (args[0],args);
        printf ("after executing execvp\n");
}

But when I run the executable 'simple' I get the following error

Code:
[acdev2@hostname tmp]$ ./simple
before executing execvp
/aaa/bbb/bin/waitdb.ORACLE: error while loading shared libraries: libuidata.so: cannot open shared object file: No such file or directory

On the other hand if I run at the commandline, the export LD_LIBRARY_PATH command before calling the binary it works FINE.

Code:
[acdev2@hostname tmp]$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/aaa/bbb/lib
[acdev2@hostname1 tmp]$ ./simple
before executing execvp
+++INFO+++ 20140103_13:54:32 @(#)waitdb[6.2/$Revision: 5538 $]: RDBMS DNYASC01 is accepting connections

Please advise how I can specify the /aaa/bbb/lib path to the linker at compile time of binary 'simple' so that when 'simple' binary tries to execvp another c binary 'waitdb.ORACLE' binary within it the linker knows where to find the libuidata.so shared library file that waitdb.ORACLE uses (without using the LD_LIBRARY_PATH variable) ?

thanks
Last edited by bartus11; 01-03-2014 at 03:32 PM.. Reason: Please use code tags
 

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LEARN ABOUT DEBIAN

fastjet-config

FASTJET-CONFIG(1)						   User Commands						 FASTJET-CONFIG(1)

NAME

       fastjet-config - fastjet-config

DESCRIPTION

       This is FastJet configuration tool.  Usage:

	      fastjet-config [--help] [--version] [--prefix] [--cxxflags] [--libs]

	      [--shared[=yes|no]] [--plugins[=yes|no]] [--rpath[=yes|no]] [--runpath] [--list-plugins] [--config]

       The arguments can be either queries (one must be present):

       --help prints this message and exits

       --version
	      prints FastJet version and exits

       --prefix
	      gets the FastJet installation directory

       --cxxflags
	      returns the compilation flags to be used with C++ programs

       --libs returns the flags to pass to the linker

       or flags (optional):

       --shared
	      controls whether you want to use the static or shared lib (default=yes)

       --plugins
	      controls whether you also want to link the FastJet plugins (default=no)

       --rpath
	      adds  a  -rpath  argument  at link-time that points to the directory where FastJet libraries are installed. This avoid having to set
	      LD_LIBRARY_PATH at runtime when using shared libs in a non standard location (but may cause the program  to  inadvertently  pick	up
	      other shared libraries that happen to be in the FastJet installation directory).	(default=yes)

       --runpath
	      at  link-time,  adds  info  about the directory where FastJet libraries are installed to the runpath (ELF systens only). This avoids
	      having to set LD_LIBRARY_PATH at runtime when using shared libs in a non	standard  location  but  gives	priority  to  an  existing
	      LD_LIBRARY_PATH.

       --list-plugins
	      list all the available plugins

       --config
	      shows a summary of how FastJet was configured

AUTHOR

       This manual page was written by Lifeng Sun <lifongsun@gmail.com> for the Debian system (but may be used by others).

fastjet-config							     May 2012							 FASTJET-CONFIG(1)
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