[Bug ipa/66705] [5/6 Regression] section is missing linker error with -flto -fipa-pta

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66705

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-30
   Target Milestone|---                         |5.2
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

Breakpoint 1, fatal_error (loc=0, gmsgid=0x1783549 "%s: section %s is missing")
    at /space/rguenther/src/svn/gcc-5-branch/gcc/diagnostic.c:1203
1203      va_start (ap, gmsgid);
Missing separate debuginfos, use: zypper install
libgmp10-debuginfo-6.0.0-71.1.x86_64 libisl13-debuginfo-0.14-25.2.x86_64
libmpc3-debuginfo-1.0.2-38.2.x86_64 libmpfr4-debuginfo-3.1.2-3.1.2.x86_64
(gdb) up
#1  0x0000000000fe0387 in varpool_node::get_constructor (this=0x7ffff6ac4000)
    at /space/rguenther/src/svn/gcc-5-branch/gcc/varpool.c:328
328                      name);
(gdb) l
323       data = lto_get_section_data (file_data, LTO_section_function_body,
324                                    name, &len);
325       if (!data)
326         fatal_error (input_location, "%s: section %s is missing",
327                      file_data->file_name,
328                      name);

(gdb) up
#2  0x0000000000eacc07 in create_variable_info_for (decl=0x7ffff68d7900, 
    name=0x1763482 "NULL")
    at /space/rguenther/src/svn/gcc-5-branch/gcc/tree-ssa-structalias.c:5808
5808              if (vnode->get_constructor ()
(gdb) l
5803              if (!vnode->all_refs_explicit_p ())
5804                make_copy_constraint (vi, nonlocal_id);
5805
5806              /* If this is a global variable with an initializer and we
are in
5807                 IPA mode generate constraints for it.  */
5808              if (vnode->get_constructor ()
5809                  && vnode->definition)

so IPA PTA needs to guard ->get_constructor () somehow?  That is, it
doesn't return NULL_TREE when it cant' get its hands on it?