https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86344
Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2018-06-28 Ever confirmed|0 |1 --- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- Ok, if you add --save-temps --verbose. You should see command line for lto1 invocation. Then it would be good to put a breakpoint and dump the symbol which triggers the assert: node1->debug() Anyway, a reduced test-case would be best to handle it.