Gcc linker search path order Post: 302903056

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Top Forums Programming Gcc linker search path order Post 302903056 by Richard Johnson on Friday 23rd of May 2014 04:40:30 PM

05-23-2014

Registered User

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 FREEBSD

zopen

ZOPEN(3)						   BSD Library Functions Manual 						  ZOPEN(3)

NAME

     zopen -- open a gzip compressed stream

LIBRARY

     Compression Library (libz, -lz)

SYNOPSIS

     FILE *
     zopen(const char *path, const char *mode);

DESCRIPTION

     The zopen() opens a gzip file whose name is the string pointed to by path and associates a stream with it.  It is a wrapper around zlib(3)
     and standard stream I/O APIs.

     The argument mode have the same meaning as it does in fopen(3).

     The zopen function will associate read, write, seek and close functions of zlib(3) after successfully opened a file with funopen(3) so that
     they will be used to read or write the new stream.

RETURN VALUES

     Upon successful completion zopen returns a FILE pointer.  Otherwise, NULL is returned and the global variable errno is set to indicate the
     error.

ERRORS

     In addition to the errors documented for fopen(3), the zopen function may also fail for:

     [ENOMEM]		Insufficient memory is available.

COMPATIBILITY

     This implementation of zopen function first appeared in NetBSD 1.6 and FreeBSD 4.5.  The zopen function may not be portable to systems other
     than FreeBSD.

SEE ALSO

     fopen(3), funopen(3), zlib(3)

BSD
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