Thanks all for your help. After I ran "sudo ldconfig -v", now the linker cache was updated, and my program is linking to the correct ones in /usr/local/lib :-) thanks again. Han On Sat, Jan 16, 2010 at 3:52 PM, Patrick Horgan <phorgan1@xxxxxxxxx> wrote: > Alfred M. Szmidt wrote: >> >> Is "/usr/local/lib" still searched before "/usr/lib" by GCC by >> default? If not, is there a way to force GCC to search >> /usr/local/lib first? >> >> GCC does search /usr/local/lib before /usr/lib (you can use gcc >> -print-search-dirs to see the exact details for your configuration) >> when linking, but your dynamic loader might not (which is what ldd >> calls, and what is used when you run the program). I think just >> modifying /etc/ld.so.conf and putting /lib before /usr/local/lib (or >> adding them in that order) should do the trick for you. Don't forget >> to run ldconfig after modifying ld.so.conf. > > To get even trickier, my linux system has this for the only line: > > include /etc/ld.so.conf.d/*.conf > > That tells me to go into /etc/ld.so.conf.d where I have a file named > libc.conf (the name doesn't matter, but it has to end with .conf to match > the wild card in /etc/ld.so.conf > > Inside /etc/ld.so.conf.d/libc.conf I have the single line: > > /usr/local/lib > > I could have added that line to the bottom of /etc/ld.so.conf as well. > > Then, every time the contents of any directories containing libraries > changes, you have to run ldconfig as root and that fixes every thing up. To > learn more read the man pages for ldd, ld.so, and ldconfig. > > Patrick > >
