https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81968
--- Comment #13 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot
Uni-Bielefeld.DE> ---
> --- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
[...]
>> Why does Solaris ld output warnings by default? Does it have an
>> option to suppress them? It doesn't seem that it considers them
>> errors?
>
> Btw, I suppose I can simply leave the names of the global UNDEFs in place.
> That'll remove that specific warning. Still the question is why solaris
> ld segfaults and whether there is a way to supress the section warning
> by doing some magic to the entry.
It seems the ld SEGV happens because the string table associated with
the symtab is size 0 and not of type SHT_STRTAB:
Section Header[171]: sh_name: .symtab
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0x14c0 sh_type: [ SHT_SYMTAB ]
sh_offset: 0x551c sh_entsize: 0x10 (332 entries)
sh_link: 172 sh_info: 325
sh_addralign: 0x4
Section Header[172]: sh_name:
sh_addr: 0 sh_flags: [ SHF_EXCLUDE ]
sh_size: 0 sh_type: [ SHT_NULL ]
sh_offset: 0x69dc sh_entsize: 0
sh_link: 0 sh_info: 0
The input object has
Section Header[171]: sh_name: .symtab
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0x14c0 sh_type: [ SHT_SYMTAB ]
sh_offset: 0x3e13c sh_entsize: 0x10 (332 entries)
sh_link: 172 sh_info: 325
sh_addralign: 0x4
Section Header[172]: sh_name: .strtab
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0xdb0 sh_type: [ SHT_STRTAB ]
sh_offset: 0x3f5fc sh_entsize: 0
sh_link: 0 sh_info: 0
sh_addralign: 0x1
instead.
I think I can see now how this happens: initially, sections 171 and 172
are marked for dropping. However, later on there's this section
Section Header[174]: sh_name: .rela.gnu.debuglto_.debug_info
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0xc sh_type: [ SHT_RELA ]
sh_offset: 0x69dc sh_entsize: 0xc (1 entry)
sh_link: 171 sh_info: 3
sh_addralign: 0x4
which causes section 171 to be retained, while 172 is still dropped,
leading to the inconsistency observed above. Btw., GNU ld chokes on
that object just the same:
$ gld-2.29 -o ltoout-as.o ltoin-as.o
gld-2.29: ltoin-as.o: attempt to load strings from a non-string section (number
172)
ltoin-as.o: error adding symbols: Bad value
Rainer
