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 X11R4

xft-config

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

NAME

       xft-config - report Xft version, compiler, linker, and/or installation directory information

SYNOPSIS

       xft-config { --exec-prefix[=local_prefix] | --prefix[=local_prefix] | --cflags | --libs } ...

       xft-config --version

DESCRIPTION

       xft-config  reports information of interest to users and developers about the installed version of the X FreeType library, Xft(3).  Depend-
       ing on how it is invoked, xft-config reports the installed version of Xft, the compiler and linker flags that are required to  successfully
       compile	and  link  C  (or C-compatible) code that uses the library, and/or the directories used by the GNU Autotools to install its files.
       Note that if the system's installed version of Xft came from an OS vendor or other third party, the actual location of its files may differ
       from those reported by xft-config.  The system adminstrator can also relocate Xft's files.

       If invoked without any arguments, xft-config will print a usage message on standard error and exit.

OPTIONS

       --cflags
	      Report the compiler flags that are required to compile code that uses Xft symbols.

       --exec-prefix[=local_prefix]
	      If  specified  without the parameter local_prefix, report the file specification prefix that Xft uses for installation of executable
	      files.  If local_prefix is specified, it is used instead of the file specification prefix used for installation of executable  files
	      by  Xft  and  the  value	of  the  option argument specified with --prefix, if any, when compile and linker flags are reported (with
	      --cflags and --libs, respectively).

       --libs Report the linker flags that are required to link code that uses Xft symbols.

       --prefix[=local_prefix]
	      If specified without the parameter local_prefix, report the file specification prefix that Xft uses for installation of  files.	If
	      local_prefix  is	specified,  it is used instead of the file specification prefix used for installation of files by Xft when compile
	      and linker flags are reported (with --cflags and --libs, respectively); also see --exec-prefix.

       --version
	      Report the version of the Xft library installed on the system and exit.

OPERANDS

       xft-config does not recognize any non-option arguments.	At least one option must be specified.

EXIT STATUS

       0      Information was successfully reported.

       1      xft-config was invoked with invalid arguments, or no arguments at all.

AUTHOR

       xft-config was written by Keith Packard.  This manual page was written by Branden Robinson.

SEE ALSO

       Xft(3)

Xft								  Version 2.1.13						     xft-config(1)