https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71855
Bug ID: 71855 Summary: duplicate unspecified_parameters DIE in DWARF for functions with variable arguments Product: gcc Version: 6.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: woodard at redhat dot com Target Milestone: --- I was looking at the DWARF generated by GCC 6.1 for M4 and it emits two DIEs for unspecified parameters. Before Dodji added special code to ignore this, it confused libabigail and may confuse other DWARF consumers. [ 1a33] subprogram external (flag_present) name (strp) "m4_error" decl_file (data1) 1 decl_line (data1) 94 prototyped (flag_present) low_pc (addr) 0x0000000000402d10 <m4_error> high_pc (data8) 194 (0x0000000000402dd2) frame_base (exprloc) [ 0] call_frame_cfa GNU_all_call_sites (flag_present) sibling (ref4) [ 1aab] [ 1a50] formal_parameter name (strp) "status" decl_file (data1) 1 decl_line (data1) 94 type (ref4) [ 58] location (sec_offset) location list [ 78e] [ 1a5f] formal_parameter name (strp) "errnum" decl_file (data1) 1 decl_line (data1) 94 type (ref4) [ 58] location (sec_offset) location list [ 7c7] [ 1a6e] formal_parameter name (strp) "format" decl_file (data1) 1 decl_line (data1) 94 type (ref4) [ d8] location (sec_offset) location list [ 800] [ 1a7d] unspecified_parameters [ 1a7e] variable name (strp) "args" decl_file (data1) 1 decl_line (data1) 96 type (ref4) [ 410] location (exprloc) [ 0] fbreg -216 [ 1a8d] unspecified_parameters [ 1a8e] GNU_call_site low_pc (addr) 0x0000000000402dad <m4_error+0x9d> abstract_origin (ref4) [ 1fba] [ 1a9b] GNU_call_site_parameter location (exprloc) [ 0] reg8 GNU_call_site_value (exprloc) [ 0] GNU_entry_value: [ 0] reg1 [ 1aa2] GNU_call_site_parameter location (exprloc) [ 0] reg9 GNU_call_site_value (exprloc) [ 0] fbreg -216 See 1a7d 1a8d. This was generated from compiling m4 from ftp://ftp.gnu.org/gnu/m4/m4-1.4.17.tar.gz with GCC 6.1 I will work on making a smaller reproducer.