[Bug middle-end/50638] [4.7 Regression] emulated TLS fails

["ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50638

--- Comment #6 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> 2011-10-07 16:58:40 UTC ---
> --- Comment #5 from Michael Matz <matz at gcc dot gnu.org> 2011-10-07 16:53:59 UTC ---
> Mine.  See also http://gcc.gnu.org/ml/gcc-patches/2011-10/msg00597.html .
> What's the variable that causes the segfault?

Program received signal SIGSEGV, Segmentation fault.
set_is_used (tp=0xbf674be4, 
   
Parma_Polyhedra_Library14Grid_Generator11set_divisorERK10__gmp_exprIA1_12__mpz_structS3_E=0x80475fc,
data=0x0)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-flow-inline.h:562
562       ann->used = true;
(gdb) where
#0  set_is_used (tp=0xbf674be4, 
   
Parma_Polyhedra_Library14Grid_Generator11set_divisorERK10__gmp_exprIA1_12__mpz_structS3_E=0x80475fc,
data=0x0)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-flow-inline.h:562
#1  mark_all_vars_used_1 (tp=0xbf674be4, 
   
Parma_Polyhedra_Library14Grid_Generator11set_divisorERK10__gmp_exprIA1_12__mpz_structS3_E=0x80475fc,
data=0x0)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-ssa-live.c:379
#2  0x087b479a in walk_tree_1 (tp=0xbf674be4, 
    func=0x868f570 <mark_all_vars_used_1>, 
    ZNK23Parma_Polyhedra_Library6Matrix8num_rowsEv=0x0, pset=0x0, lh=0)
    at /vol/gcc/src/hg/trunk/local/gcc/tree.c:10457
#3  0x08690152 in mark_all_vars_used ()
    at /vol/gcc/src/hg/trunk/local/gcc/tree-ssa-live.c:595
#4  remove_unused_locals ()
    at /vol/gcc/src/hg/trunk/local/gcc/tree-ssa-live.c:727
#5  0x084e8909 in execute_function_todo (
    __gmp_exprIA1_12__mpq_structS3_EE6Status10ascii_loadERSi=0x826)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:1695
#6  0x084e8f44 in mp_exprIA1_12__mpq_structS1_E7set_strEPKci (
    _RKNS_17Constraint_SystemEPj=0x84e87b4 <execute_function_todo>, 
    __gmp_exprIA1_12__mpq_structS3_EE6Status10ascii_loadERSi=0x826)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:1548
#7  0x084e943e in execute_todo (2__mpz_structS7_E=2086)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:1741
#8  0x084ec2da in execute_one_pass (essionENS_15Relation_SymbolES4_=0x923e6a0)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2087
#9  0x084ec601 in execute_pass_list (essionENS_15Relation_SymbolES4_=0x923e6a0)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2119
#10 0x084ec614 in execute_pass_list (essionENS_15Relation_SymbolES4_=0x8f6c420)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2120
#11 0x084ec614 in execute_pass_list (essionENS_15Relation_SymbolES4_=0x8f6bb20)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2120
#12 0x0860d603 in tree_rest_of_compilation (
    4NNC_PolyhedronEEESaIS3_EE6removeERKS3_=0xbf638f80)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-optimize.c:420
#13 0x082927d3 in cgraph_expand_function (
   
ZN23Parma_Polyhedra_Library3BoxINS_8IntervalI10__gmp_exprIA1_12__mpq_structS4_ENS_25Interval_Restriction_NoneINS_20Interval_Info_BitsetIjNS_29Rational_Interval_Info_PolicyEEEEEEEE24generalized_affine_imageENS_8VariableENS_15Relation_SymbolERKNS_17Linear_ExpressionERKS2_IA1_12__mpz_structSJ_E=0xbf5bf668)
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1805
#14 0x08294a15 in Status8test_allEj ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1864
#15 cgraph_optimize () at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:2141
#16 0x08294e7b in cgraph_finalize_compilation_unit ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1312
#17 0x08166724 in c_write_global_declarations ()
    at /vol/gcc/src/hg/trunk/local/gcc/c-decl.c:9936
#18 0x0859e922 in compile_file (argc=11, argv=0x804794c)
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:581
#19 do_compile (argc=11, argv=0x804794c)
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:1925
#20 toplev_main (argc=11, argv=0x804794c)
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:2001
#21 0x08cacf9b in main (argc=11, argv=0x804794c)
    at /vol/gcc/src/hg/trunk/local/gcc/main.c:36
(gdb) up
#1  mark_all_vars_used_1 (tp=0xbf674be4, 
   
Parma_Polyhedra_Library14Grid_Generator11set_divisorERK10__gmp_exprIA1_12__mpz_structS3_E=0x80475fc,
data=0x0)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-ssa-live.c:379
379           set_is_used (t);
(gdb) p t
$1 = (tree) 0xbf656e40
(gdb) pt
 <var_decl bf656e40 __emutls_v.__go_panic_defer
    type <record_type bf656de0 __emutls_object BLK
        size <integer_cst bf5b5a48 constant 128>
        unit size <integer_cst bf5b5a64 constant 16>
        align 32 symtab 0 alias set -1 canonical type bf656de0
        fields <field_decl bf64bf74 __size type <integer_type bf5c73c0 unsigned
int>
            unsigned SI file 
Program received signal SIGSEGV, Segmentation fault.
0xbf6dd359 in strlen () from /usr/lib/libc.so.1
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on".
Evaluation of the expression containing the function
(debug_tree(tree_node*)) will be abandoned.
When the function is done executing, GDB will silently stop.

    Rainer