[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO

["markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375

--- Comment #65 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2011-04-03 11:32:08 UTC ---
(In reply to comment #62)
> and since it doesn't fail at link time, this is debug info bug, not LTO, so if
> you get a testcase, please open a new PR.

You're right, it builds fine without "-g" (ac_add_options
--disable-debug-symbols).

But the build now fails early when elfhack is enabled:

with gold:
c++ -o elfhack -fno-rtti -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth
-Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wcast-align -Wno-invalid-offsetof
-Wno-variadic-macros -Werror=return-type -Wno-long-long -march=native
-fpermissive -flto=4 -fuse-linker-plugin -fwhole-program -fno-strict-aliasing
-fshort-wchar -pthread -pipe -fexceptions  -DNDEBUG -DTRIMMED -g -O3 -lpthread
-Wl,-O1,--hash-style=gnu,--as-needed,--no-keep-memory  
-Wl,-rpath-link,/var/tmp/mozilla-central/moz-build-dir/dist/bin
-Wl,-rpath-link,/usr/lib  host_elf.o host_elfhack.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.0/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccGQbukN.ltrans3.ltrans.o: in function
_ZN8Elf_Ehdr9serializeERSt14basic_ofstreamIcSt11char_traitsIcEEcc.local.402:/var/tmp/mozilla-central/build/unix/elfhack/elfxx.h:239:
error: undefined reference to 'void Elf_Ehdr_Traits::swap<big_endian,
Elf64_Ehdr, serializable<Elf_Ehdr_Traits> >(serializable<Elf_Ehdr_Traits>&,
Elf64_Ehdr&)'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.0/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccGQbukN.ltrans3.ltrans.o: in function
_ZN8Elf_Ehdr9serializeERSt14basic_ofstreamIcSt11char_traitsIcEEcc.local.402:/var/tmp/mozilla-central/build/unix/elfhack/elfxx.h:228:
error: undefined reference to 'void Elf_Ehdr_Traits::swap<big_endian,
Elf32_Ehdr, serializable<Elf_Ehdr_Traits> >(serializable<Elf_Ehdr_Traits>&,
Elf32_Ehdr&)'
collect2: ld returned 1 exit status
make[7]: *** [elfhack] Error 1

or with gnu-ld:
In function `serialize':
/var/tmp/mozilla-central/build/unix/elfhack/elfxx.h:239: undefined reference to
`void Elf_Ehdr_Traits::swap<big_endian, Elf64_Ehdr,
serializable<Elf_Ehdr_Traits> >(serializable<Elf_Ehdr_Traits>&, Elf64_Ehdr&)'
/var/tmp/mozilla-central/build/unix/elfhack/elfxx.h:228: undefined reference to
`void Elf_Ehdr_Traits::swap<big_endian, Elf32_Ehdr,
serializable<Elf_Ehdr_Traits> >(serializable<Elf_Ehdr_Traits>&, Elf32_Ehdr&)'
collect2: ld returned 1 exit status

see also: https://bugzilla.mozilla.org/show_bug.cgi?id=647458
(but it does look more like a gcc lto bug to me)