https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64801
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- You are right, the problem is hidden in cooperation between IPA inliner and ICF. If I run the test w/o ICF, inliner sets NULL to the fsp_detect FUNCTION_DECL: #0 0x000000000074541e in symtab_node::unregister (this=0x7ffff6c47620) at ../../gcc/symtab.c:407 #1 0x000000000074b0ef in cgraph_node::remove (this=0x7ffff6c47620) at ../../gcc/cgraph.c:1741 #2 0x0000000000b891b9 in expand_call_inline (id=0x7fffffffd5c0, stmt=0x7ffff6d54aa0, bb=<optimized out>) at ../../gcc/tree-inline.c:4762 #3 gimple_expand_calls_inline (id=0x7fffffffd5c0, bb=<optimized out>) at ../../gcc/tree-inline.c:4787 so that cgraph_node::get(decl) == NULL here: if (symtab->state != LTO_STREAMING) │1784 { B+>│1785 n = cgraph_node::get (decl); │1786 if (!n │1787 || (!n->clones && !n->clone_of && !n->global.inlined_to │1788 && (symtab->global_info_ready │1789 && (TREE_ASM_WRITTEN (n->decl) │1790 || DECL_EXTERNAL (n->decl) │1791 || !n->analyzed │1792 || (!flag_wpa && n->in_other_partition))))) │1793 release_body (); │1794 } That's the reason why the body is not removed. On the contrary, with ICF, aforementioned condition is satisfied and fsp_detect's body is removed. I think the situation after IPA ICF is correct: fsp_detect/2 (fsp_detect) @0x7ffff6c47620 Type: function definition analyzed Visibility: external public References: Referring: Availability: available First run: 0 Function flags: body Called by: elantech_detect/1 (1.00 per call) psmouse_extensions/3 (1.00 per call) Calls: elantech_detect/1 (elantech_detect) @0x7ffff6c47498 Type: function definition analyzed Visibility: externally_visible public References: Referring: Availability: available First run: 0 Function flags: body icf_merged Called by: Calls: fsp_detect/2 (1.00 per call) Can you please help me Honza? Thanks, Martin