Frederik wrote:
> On Wed, 11 Jun 2008 13:46:45 +0100, Andrew Haley wrote:
>
>> What does readelf -d test say?
>
> $ echo $LIBRARY_PATH
> /cvos/shared/apps/gcc/gcc-4.2.4//lib:/cvos/shared/apps/boost/gcc-4.2/1.35.0/lib
I'm not sure this will have any effect.
> $ echo $LD_LIBRARY_PATH
> /cvos/shared/apps/gcc/gcc-4.2.4//lib:/cvos/shared/apps/boost/gcc-4.2/1.35.0/lib:/cvos/shared/apps/sge/6.1/lib/lx26-amd64
This should work, though.
> $ g++ -o test test.cpp -lboost_regex
Use `gcc -v' here. Let's see what that says.
> $ readelf -d test
>
> Dynamic section at offset 0xf778 contains 24 entries:
> Tag Type Name/Value
> 0x0000000000000001 (NEEDED) Shared library: [libboost_regex.so.2]
Right, so it's liked against libboost_regex.so.2. The first instance of
libboost_regex.so.2 that is found in LD_LIBRARY_PATH will be used.
> $ ls -l /cvos/shared/apps/boost/gcc-4.2/1.35.0/lib/*regex*
> lrwxrwxrwx 1 root root 27 Jun 11 12:22 /cvos/shared/apps/boost/gcc-4.2/1.35.0/lib/libboost_regex-mt.so -> libboost_regex-mt.so.1.35.0
> -rwxr-xr-x 1 root root 5881209 Jun 11 12:22 /cvos/shared/apps/boost/gcc-4.2/1.35.0/lib/libboost_regex-mt.so.1.35.0
> lrwxrwxrwx 1 root root 24 Jun 11 12:21 /cvos/shared/apps/boost/gcc-4.2/1.35.0/lib/libboost_regex.so -> libboost_regex.so.1.35.0
> -rwxr-xr-x 1 root root 5881164 Jun 11 12:21 /cvos/shared/apps/boost/gcc-4.2/1.35.0/lib/libboost_regex.so.1.35.0
>
> So here I would have expected it to link against libboost_regex.so.1.35.0
> instead of libboost_regex_so.2. What am I doing wrong here?
I'm not sure yet.
Andrew.
The linker uses the following search paths to locate required
shared libraries:
1. Any directories specified by `-rpath-link' options.
2. Any directories specified by `-rpath' options. The difference
between `-rpath' and `-rpath-link' is that directories
specified by `-rpath' options are included in the executable
and used at runtime, whereas the `-rpath-link' option is only
effective at link time. Searching `-rpath' in this way is
only supported by native linkers and cross linkers which have
been configured with the `--with-sysroot' option.
3. On an ELF system, if the `-rpath' and `rpath-link' options
were not used, search the contents of the environment variable
`LD_RUN_PATH'. It is for the native linker only.
4. On SunOS, if the `-rpath' option was not used, search any
directories specified using `-L' options.
5. For a native linker, the contents of the environment variable
`LD_LIBRARY_PATH'.
6. For a native ELF linker, the directories in `DT_RUNPATH' or
`DT_RPATH' of a shared library are searched for shared
libraries needed by it. The `DT_RPATH' entries are ignored if
`DT_RUNPATH' entries exist.
7. The default directories, normally `/lib' and `/usr/lib'.
8. For a native linker on an ELF system, if the file
`/etc/ld.so.conf' exists, the list of directories found in
that file.
