http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56706
--- Comment #10 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> --- So, after the change from fat to slim lto, I've added the CP2K SVN repo to use gcc-ar (so that the instructions in comment #1 should still work). Now, the issue discussed here fails to reproduce because during the lto phase we run into: /data/vjoost/clean/cp2k/cp2k/makefiles/../src/thermostat_methods.F:102:0: internal compiler error: tree check: expected ssa_name, have integer_cst in simplify_conversion_from_bitmask, at tree-ssa-forwprop.c:1189 SUBROUTINE create_thermostats(thermostats, md_section, force_env, simpar, & ^ 0xb15de4 tree_check_failed(tree_node const*, char const*, int, char const*, ...) ../../gcc/gcc/tree.c:9189 0x9e52c0 tree_check ../../gcc/gcc/tree.h:2710 0x9e52c0 simplify_conversion_from_bitmask ../../gcc/gcc/tree-ssa-forwprop.c:1189 0x9ef3cd ssa_forward_propagate_and_combine ../../gcc/gcc/tree-ssa-forwprop.c:3552 0x9ef3cd execute ../../gcc/gcc/tree-ssa-forwprop.c:3661 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. make[2]: *** [/tmp/ccEVGVIu.ltrans20.ltrans.o] Error 1