If you want to build openwrt linking against the glibc you could run into problem that the gcc compiler version which is choosen by default have some problems with the glibc c version.

Exactly when check out the default gcc version was " gcc 4.2.4" and this will run with the latest glibc version glibc 2.7 but its not working if you choose glibc version 2.3.6 there are some optimization in the gcc 4.2.6 which do not work with glibc 2.3.6.

If you want to build with glibc 2.3.6 you should also choose gcc 4.1.2 the the build runs through.

hope somebody could fix the   dependencies between GCC and glibc that if you choose this glkibc version automatic the right gcc version will be set or at least the latest last working.

Martin

P.S This was a hint from a freind how helped me to find this "Bug"