Re: gcc7 issue with efl + aarch64

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On Mon, Feb 20, 2017 at 04:51:47PM -0500, Tom Callaway wrote:
> I'm stumped here. efl builds against all rawhide arches except aarch64,
> where it has started failing like this (since gcc 7):
> 
> https://kojipkgs.fedoraproject.org//work/tasks/2376/17972376/build.log
[...]
> Any gcc gurus have any thoughts?

This has nothing to do with GCC 7 or GCC at all.  It's crashing in
lt-elua.  Looks like a bug in luajit:

#0  getcurrenv (L=0xffff91b40378, L=0xffff91b40378) at lj_api.c:76
#1  lua_pushcclosure (L=L@entry=0xffff91b40378, 
    f=0xffff92b53530 <luaopen_base>, n=n@entry=0) at lj_api.c:619
#2  0x0000ffff92b5a8c0 in luaL_openlibs (L=0xffff91b40378) at lib_init.c:43
#3  0x0000ffff92bc46e4 in elua_state_new (
    progname=0xffffcd43eb3f "/home/rjones/d/fedora/efl/master/efl-1.18.4/src/bin/elua/.libs/lt-elua") at lib/elua/elua.c:79
#4  0x0000aaaad4ab164c in main (argc=10, argv=0xffffcd431188)
    at bin/elua/main.c:165

(gdb) list
71    }
72    
73    static GCtab *getcurrenv(lua_State *L)
74    {
75      GCfunc *fn = curr_func(L);
76	  return fn->c.gct == ~LJ_TFUNC ? tabref(fn->c.env) : tabref(L->env);
77	  }

(gdb) print *fn
Cannot access memory at address 0x7fff91b40378
(gdb) print *L
$2 = {
  nextgc = {
    gcptr64 = 0
  }, 
  marked = 97 'a', 
  gct = 6 '\006', 
  dummy_ffid = 1 '\001', 
  status = 0 '\000', 
  glref = {
    ptr64 = 281473126237144
  }, 
  gclist = {
    gcptr64 = 0
  }, 
  base = 0xffff91b40f10, 
  top = 0xffff91b40f10, 
  maxstack = {
    ptr64 = 281473126240312
  }, 
  stack = {
    ptr64 = 281473126240000
  }, 
  openupval = {
    gcptr64 = 0
  }, 
  env = {
    gcptr64 = 281473126240384
  }, 
  cframe = 0x0, 
  stacksize = 47
}


> I don't have an aarch64 setup, but even
> if I did, this isn't much to go on.

It's a real shame that none of the cheap 64 bit boards work with
Fedora.  I hear it is possible that the ODROID-C2 *should* be able to
run Fedora 25 (or maybe Rawhide), but I don't think it has been tested
by anyone.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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