When I debug lto1, the missing command line option file generates a misleading error message and causes ICE:
[...@gnu-34 gcc]$ touch x.s [...@gnu-34 gcc]$ gcc -c x.s [...@gnu-34 gcc]$ /export/build/gnu/gcc/build-x86_64-linux/gcc/lto1 -quiet -dumpbase x.o -mtune=generic -auxbase-strip /tmp/cc0mkdyt.lto.o -O2 -version @/tmp/ccsQ6Ult -o y.s GNU GIMPLE (GCC) version 4.5.0 20091229 (experimental) (x86_64-unknown-linux-gnu) compiled by GNU C version 4.5.0 20091229 (experimental), GMP version 4.3.1, MPFR version 2.4.2, MPC version 0.8 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 lto1: internal compiler error: could not parse hex number Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. [...@gnu-34 gcc]$ -- Summary: Missing command line option file causes ICE Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: lto AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hjl dot tools at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42580