ld can't find library during linking

kvtournh · 02-22-2007, 02:44 PM

Hi,

I try to compile a program written in c++ but needs a fortran library which needs the ifcore library from ifort. I do the following which should work (afaik)

Code:

$ icpc -O3 -xP -axP -no-ipo -o blub blub.o fortlib.a -lifcore
ld: cannot find -lifcore

libifcore.so, libifcore.so.5 and libifcore.a are all included in the directory /usr/local/intel/fce/9.1.036/lib/ and this directory is located in /etc/ld.conf.so

Code:

 $ ls -l /usr/local/intel/fce/9.1.036/lib/*ifcore*
-rw-r--r-- 1 root root 1229946 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcore.a
-rw-r--r-- 1 root root 1260052 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcoremt.a
-rw-r--r-- 1 root root 1265484 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcoremt_pic.a
-rwxr-xr-x 1 root root      27 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcoremt.so*
-rwxr-xr-x 1 root root  969224 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcoremt.so.5*
-rw-r--r-- 1 root root 1234150 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcore_pic.a
-rwxr-xr-x 1 root root      25 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcore.so*
-rwxr-xr-x 1 root root  951040 Jul  7  2006 /usr/local/intel/fce/9.1.036/lib/libifcore.so.5*
$ cat /etc/ld.so.conf
include ld.so.conf.d/*.conf
/usr/X11R6/lib
/usr/lib/qt3/lib64
/usr/local/lib/root
/usr/local/intel/cc/9.1.042/lib
/usr/local/intel/cce/9.1.042/lib
/usr/local/intel/fce/9.1.036/lib

$ ldconfig -p | grep ifcore
        libifcoremt.so.5 (libc6,x86-64) => /usr/local/intel/fce/9.1.036/lib/libifcoremt.so.5
        libifcore.so.5 (libc6,x86-64) => /usr/local/intel/fce/9.1.036/lib/libifcore.so.5

So ... what is going wrong here?

matthewg42 · 02-22-2007, 02:58 PM

I think the ld.so.conf is only changing what paths are searched at runtime of the program, and not used by ld, so you need to add the path using a -L option:

Code:

-L/usr/local/intel/fce/9.1.036/lib

If you added the paths to ld.so.conf since the last boot, make sure you run ldconfig to update the linker cache before you run your program.

kvtournh · 02-22-2007, 04:47 PM

Quote:

Originally Posted by matthewg42

I think the ld.so.conf is only changing what paths are searched at runtime of the program, and not used by ld, so you need to add the path using a -L option:

Code:

-L/usr/local/intel/fce/9.1.036/lib

If you added the paths to ld.so.conf since the last boot, make sure you run ldconfig to update the linker cache before you run your program.

Thanks matthew,
You are completely right. I knew this already (the -L) ... but I thought that the library-paths searched in, were those of the ld program. This is not true at all. It are the paths the compiler uses. The -print-search-path flag shows those.

It all makes sence now, because i was already wondering how they could distinguish between libraries with the same name and version numbers but other directory.

regards