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Re: LIBRARY_PATH not used before /usr/lib anymore in gcc 4.2 and later?


Frederik wrote:
> On Wed, 11 Jun 2008 14:55:54 +0100, Andrew Haley wrote:
>
>> 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.
>
> Isn't the above necessary so that it searches for the libboost_regex.so
> link in that directory, which would make it build at compile time against
> libboost.so.1.35.0 in my case? (Well, that's what I expected, but it
> clearly does not do that here when using gcc 4.2 or 4.3)

I don't think that it will have any effect at all.

>>> $ 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.

OK, here's the important part.  These are the directories that the
linker searches first:

-L/cvos/shared/apps/gcc/gcc-4.2.4//lib/../lib64 \
-L/cvos/shared/apps/gcc/gcc-4.2.4/lib/gcc/x86_64-unknown-linux-gnu/4.2.4 \
-L/cvos/shared/apps/gcc/gcc-4.2.4/lib/gcc/x86_64-unknown-linux-gnu/4.2.4/../../../../lib64 \
-L/lib/../lib64 \
-L/usr/lib/../lib64 \
-L/cvos/shared/apps/gcc/gcc-4.2.4//lib \
-L/cvos/shared/apps/boost/gcc-4.2/1.35.0/lib \
-L/cvos/shared/apps/gcc/gcc-4.2.4/lib/gcc/x86_64-unknown-linux-gnu/4.2.4/../../.. \

Only if libboost_regex is not found in one of these will ld use
`LD_LIBRARY_PATH'.  If you want to make sure that your libboost_regex is
used, either put it in one of these directories or specify -L explicitly.

Andrew.


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