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Full Discussion: Gcc linker search path order
Top Forums Programming Gcc linker search path order Post 302903056 by Richard Johnson on Friday 23rd of May 2014 04:40:30 PM
Old 05-23-2014
Gcc linker search path order
I have a build where I wish to link against and load a specific version of a library and a different version of the same library is installed on the system. I'm using a -L option to point to the version that I wish to link against but gcc still seems to choose the installed version. Is there a way to force gcc to search the directory specified with the -L option before it searches the standard locations?

I'm running Centos 6.5 with gcc 4.4.7. Here are the relevant libs and directories, zlib-devel is not installed
Code:
/lib64/libz.so.1.2.3
/lib64/libz.so.1 -> libz.so.1.2.3
 
/home/richj/product/zlib/lib/libz.so.1.2.8
/home/richj/product/zlib/lib/libz.so -> libz.so.1.2.8
/home/richj/product/zlib/lib/libz.so.1 -> libz.so.1.2.8
/home/richj/product/zlib/include/zlib.h
 
/home/richj/product/foo/libfoo.so
/home/richj/product/foo/foo.h
 
/home/richj/product/bar/bar.c

Main in bar.c calls foo in libfoo.so and foo calls inflateInit in libz Here are the compile commands for libfoo.so and bar. Both the library and the program compile and run without error.
Code:
/usr/bin/gcc -c -fPIC -Wall -g -I../zlib/include foo.c
/usr/bin/gcc -shared -o libfoo.so foo.o
 
/usr/bin/gcc -Wall -g -I../foo -L../foo -lfoo -L../zlib/lib -lz bar.c -o bar
 
$ldd bar
linux-vdso.so.1 => (0x00007fffd67ff000)
libfoo.so => ../foo/libfoo.so
libz.so.1 => /lib64/libz.so.1
libc.so.6 => /lib64/libc.so.6
/lib64/ld-linux-x86-64.so.2

So the question is why is it not linking against and loading the version of zlib that I point to in the compile command?
Last edited by Scott; 05-23-2014 at 06:09 PM.. Reason: Please use code tags
 

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LEARN ABOUT DEBIAN

redland-config

redland-config(1)					      General Commands Manual						 redland-config(1)

NAME

       redland-config - script to get information about the installed version of Redland

SYNOPSIS

       redland-config [--cflags] [--help] [--libs] [--libtool-libs] [--prefix[=DIR]] [--private-libs] [--version-decimal] [--version]

DESCRIPTION

       redland-config  is  a tool that is used to determine the compile and linker flags that should be used to compile and link programs that use
       the Redland RDF library.

OPTIONS

       redland-config accepts the following options:

       --version
	       Print the currently installed version of redland on the standard output.

       --version-decimal
	       Print the currently installed version of redland as a decimal integer.

       --libs  Print the linker flags that are necessary to link a redland program.  This excludes linker  arguments  used  to	build  the  librdf
	       shared library.

       --libtool-libs
	       Print the flags that are necessary to link a redland program with libtool.

       --private-libs
	       Print the linker flags that are necessary to build the librdf shared library.  This option is not usually needed because the librdf
	       shared library has already been dynamically linked against these libs.

       --cflags
	       Print the compiler flags that are necessary to compile a redland program.

       --prefix=PREFIX
	       If specified, use PREFIX instead of the installation prefix that redland was built with when computing the output for the  --cflags
	       and --libs options. This option must be specified before any --libs or --cflags options.

SEE ALSO

       redland(3),

AUTHOR

       Dave Beckett - http://www.dajobe.org/ <http://www.dajobe.org/>

								    2008-09-07							 redland-config(1)
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