Original email is here: https://gcc.gnu.org/ml/gcc-help/2014-11/msg00050.html Summary: Attempting to bootstrap 4.9.0 from 4.8.0 on Android fails at building shared libgcc_s_so...specifically when linking the shared lib...throwing an "undefined reference to dlopen" within the fakechroot environment I am using. Since that email...and after wise advice from same...I've bootstrapped 4.8.3 from 4.8.0 and attempted to bootstrap 4.9.2 from 4.8.3. I'm still running into the same error and I can't seem to figure out the cause. For the last build attempt, I added -ldl to t-slibgcc in $srcdir/libgcc/config (recommended previously) and to the LD_DYNAMIC_OPTION for libasan and libtsan in gnu-user.h (because I noticed differences between the build compiler spec file and that of xgcc). Build still failed at the same place. Any advice/tips would be very much appreciated. Cyd