Compiling glibc I get a segmentation fault:
/ -fpreprocessed
strptime_l.i -quiet -dumpbase strptime_l.c -mtune=k8 -auxbase-strip
/ -g -Wall -Winline
-Wstrict-prototypes -Wwrite-strings -std=gnu99 -version -o strptime_l.s
GNU C version 4.1.0 20050821 (experimental) (x86_64-suse-linux-gnu)
compiled by GNU C version 4.1.0 20050821 (experimental).
GGC heuristics: ggc-min-expand=30 ggc-min-heapsize=4096
Compiler executable checksum:
strptime_l.i: In function __strptime_internal:
strptime_l.i:7079: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <for instructions.
(gdb) r -fpreprocessed strptime_l.i -quiet -dumpbase strptime_l.c -mtune=k8
-auxbase-strip / -g -Wall -Winline
-Wstrict-prototypes -Wwrite-strings -std=gnu99 -version -o strptime_l.s
GNU C version 4.1.0 20050821 (experimental) (x86_64-suse-linux-gnu)
compiled by GNU C version 4.1.0 20050821 (experimental).
GGC heuristics: ggc-min-expand=30 ggc-min-heapsize=4096
Compiler executable checksum:
Program received signal SIGSEGV, Segmentation fault.
fold_binary (code=MINUS_EXPR, type=0x2aaaaadf86e0, op0=0x0, op1=0x2aaaab27ad80)
at /cvs/gcc/gcc/fold-const.c:7127
7127 if (TREE_CDE (arg0) == CMPUND_EXPR)
(gdb) bt
#0 fold_binary (code=MINUS_EXPR, type=0x2aaaaadf86e0, op0=0x0,
op1=0x2aaaab27ad80) at /cvs/gcc/gcc/fold-const.c:7127
#1 0x000000000060e919 in fold_build2_stat (code=MINUS_EXPR,
type=0x2aaaaadf86e0, op0=0x0, op1=0x2aaaab27ad80)
at /cvs/gcc/gcc/fold-const.c:10480
#2 0x00000000004d1010 in (loop=0xf4f7c0) at
/
#3 0x00000000004d1588 in scev_probably_wraps_p (type=0x2aaaaadf86e0,
base=<value optimized out>, step=<value optimized out>,
at_stmt=0x0, loop=0xf4f7c0, init_is_max=0x7fffffffd5e7 "",
unknown_max=0x7fffffffd5e7 "")
at /
#4 0x00000000009d4552 in chrec_convert (type=0x2aaaaadf86e0,
chrec=0x2aaaab33c960, at_stmt=0x0) at /cvs/gcc/gcc/tree-chrec.c:1133
#5 0x00000000009d9fde in instantiate_parameters_1 (loop=0xf4f7c0,
chrec=0x2aaaab2fd180, allow_superloop_chrecs=1 '\001',
cache=0xf144c0) at /
#6 0x00000000009dab81 in instantiate_parameters (loop=0xf4f7c0,
chrec=0x2aaaab2fd180) at /
#7 0x000000000097e845 in vrp_visit_assignment (stmt=0x2aaaab37f870,
output_p=0x7fffffffd730) at /cvs/gcc/gcc/tree-vrp.c:1544
#8 0x00000000004e4456 in simulate_stmt (stmt=0x2aaaab37f870) at
/
#9 0x00000000004e4bb9 in ssa_propagate (visit_stmt=<value optimized out>,
visit_phi=<value optimized out>)
at /
#10 0x00000000009806b4 in execute_vrp () at /cvs/gcc/gcc/tree-vrp.c:3915
#11 0x000000000097077c in execute_one_pass (pass=0xd92860) at
/cvs/gcc/gcc/passes.c:808
#12 0x00000000009708ac in execute_pass_list (pass=0xd92860) at
/cvs/gcc/gcc/passes.c:840
#13 0x00000000009708be in execute_pass_list (pass=0xd8eac0) at
/cvs/gcc/gcc/passes.c:841
#14 0x0000000000483135 in tree_rest_of_compilation (fndecl=0x2aaaab047500) at
/
#15 0x000000000040bf4d in c_expand_body (fndecl=0x2aaaab047500) at
/cvs/gcc/gcc/c-decl.c:6633
#16 0x00000000009c4a26 in cgraph_expand_function (node=0x2aaaab373160) at
/cvs/gcc/gcc/cgraphunit.c:1037
#17 0x00000000009c6bbb in cgraph_optimize () at /cvs/gcc/gcc/cgraphunit.c:1103
#18 0x0000000000416123 in c_write_global_declarations () at
/cvs/gcc/gcc/c-decl.c:7618
#19 0x00000000009425d6 in toplev_main (argc=<value optimized out>, argv=<value
optimized out>) at /cvs/gcc/gcc/toplev.c:984
#20 0x00002aaaaabde54a in __libc_start_main () from /lib64/tls/libc.so.6
#21 0x000000000040265a in _start () at start.S:113
(gdb) pt type
<integer_type 0x2aaaaadf86e0 long unsigned int sizes-gimplified asm_written
public unsigned DI
size <integer_cst 0x2aaaaadeac30 type <integer_type 0x2aaaaadf80b0
bit_size_typeconstant invariant 64>
unit size <integer_cst 0x2aaaaadeac60 type <integer_type 0x2aaaaadf8000 long
unsigned intconstant invariant 8>
align 64 symtab -1428224608 alias set -1 precision 64 min <integer_cst
0x2aaaaadead50 0max <integer_cst 0x2aaaaadead20 18446744073709551615>
pointer_to_this <pointer_type 0x2aaaab059160>>
(gdb) pt op1
<integer_cst 0x2aaaab27ad80 type <integer_type 0x2aaaab075bb0constant
invariant 0>
This bug has been introduced during the last 7 days.

Additional Comments From aj at gcc dot gnu dot org 2005-08-22 05:01
Created an attachment (id=9550)
()
testcase

Additional Comments From pinskia at gcc dot gnu dot org 2005-08-22 11:06
Reducing.

Additional Comments From pinskia at gcc dot gnu dot org 2005-08-22 11:50
Confirmed, reduced testcase:
struct locale_data {
int t;
union locale_data_value {
const char *string;
}values [];
};
void f(const char*);
extern const struct locale_data _nl_C_LC_TIME ;
void g(void)
{
int cnt;
for (cnt = 0;cnt < 12;++cnt)
f (((&_nl_C_LC_TIME.values[1].string)[cnt]));
}

Yes the backtrace is slightly different but the problem is that same, basicially the values[] is the issue
here. Changing it to values[1] and it works.

Additional Comments From sebastian dot pop at cri dot ensmp dot fr 2005-08-22 12:34
The following patch fixes the problem. However I cannot boot'n'regtest
it for the moment. I will commit it only tomorow once it is validated.

seb

tree-ssa-loop-niter.c.~2.39.~2005-08-21 12:48:06.000000000 +0200
tree-ssa-loop-niter.c2005-08-22 14:30:17.000000000 +0200

1460,1466
if (init == NULL_TREE
|| step == NULL_TREE
|| TREE_CDE (init) != INTEGER_CST
! || TREE_CDE (step) != INTEGER_CST)
break;

utype = unsigned_type_for (type);
1460,1468
if (init == NULL_TREE
|| step == NULL_TREE
|| TREE_CDE (init) != INTEGER_CST
! || TREE_CDE (step) != INTEGER_CST
! || TYPE_MIN_VALUE (type) == NULL_TREE
! || TYPE_MAX_VALUE (type) == NULL_TREE)
break;

utype = unsigned_type_for (type);

Additional Comments From cvs-commit at gcc dot gnu dot org 2005-08-23 08:15
Subject: Bug 23511

CVSRT:/cvs/gcc
Module name:gcc
Changes by:spop (AT) gcc (DOT) gnu.org2005-08-23 08:15:19

Modified files:
gcc : ChangeLog tree-ssa-loop-niter.c

Log message:
PR tree-optimization/23511
* tree-ssa-loop-niter.c (): Don't
handle cases where TYPE_MIN_VALUE or TYPE_MAX_VALUE are NULL_TREE.

Patches:

Additional Comments From pinskia at gcc dot gnu dot org 2005-08-23 11:10
Fixed.