http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51043
Bug #: 51043
Summary: [4.7 Regression]: g++.dg/lto/20100423-3
cp_lto_20100423-3_0.o assemble, -flto -g
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: regression
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: h...@gcc.gnu.org
CC: do...@gcc.gnu.org, ja...@gcc.gnu.org
Host: x86_64-unknown-linux-gnu
Target: cris-axis-elf
This test previously passed, now it fails.
A patch in the revision range (last_known_working:first_known_failing)
181113:181134 exposed or caused these regressions. Since then, up to and
including at least r181179 it fails as follows:
Running /tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/lto/lto.exp ...
...
FAIL: g++.dg/lto/20100423-3 cp_lto_20100423-3_0.o assemble, -flto -g (internal
compiler error)
The message in g++.log says:
xecuting on host:
/tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/g++/../../g++
-B/tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/g++/../../ -nostdinc++
-I/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libstdc++-v3/include/cris-elf
-I/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libstdc++-v3/include
-I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/libsupc++
-I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/include/backward
-I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/testsuite/util -fmessage-length=0 -flto
-g -c -isystem
/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/./newlib/targ-include -isystem
/tmp/hpautotest-gcc1/gcc/newlib/libc/include -o cp_lto_20100423-3_0.o
/tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/lto/20100423-3_0.C (timeout =
300)
/tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/lto/20100423-3_0.C: In function
'foo()':
/tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/lto/20100423-3_0.C:8:1: internal
compiler error: Segmentation fault
And the segfault; from gdb:
Starting program: /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/cc1plus
-fpreprocessed 20100423-3_0.ii -melf -quiet -dumpbase 20100423-3_0.C
-auxbase-strip cp_lto_20100423-3_0.o -g -version -fmessage-length=0 -flto -o
20100423-3_0.s
GNU C++ (GCC) version 4.7.0 20111108 (experimental) [trunk revision 181179]
(cris-elf)
compiled by GNU C version 4.4.3 20100127 (Red Hat 4.4.3-4), GMP version
4.3.0, MPFR version 2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C++ (GCC) version 4.7.0 20111108 (experimental) [trunk revision 181179]
(cris-elf)
compiled by GNU C version 4.4.3 20100127 (Red Hat 4.4.3-4), GMP version
4.3.0, MPFR version 2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 4633978199e671cd4ac0b784666452ee
Program received signal SIGSEGV, Segmentation fault.
0x00000000004c6d17 in get_template_info (t=0x7ffff7ef9738) at
/tmp/hpautotest-gcc1/gcc/gcc/cp/pt.c:332
332 tinfo = TYPE_TEMPLATE_INFO (t);
(gdb) p t
$1 = (const union tree_node *) 0x7ffff7ef9738
(gdb) pt
<union_type 0x7ffff7ef9738 sizes-gimplified type_5 SI
size <integer_cst 0x7ffff7dc5ba0 type <integer_type 0x7ffff7dd90a8
bitsizetype> constant 32>
unit size <integer_cst 0x7ffff7dc5bc0 type <integer_type 0x7ffff7dd9000
sizetype> constant 4>
align 8 symtab -136395520 alias set -1 canonical type 0x7ffff7ef9738
fields <field_decl 0x7ffff7ef42f8 i
type <integer_type 0x7ffff7dd95e8 int sizes-gimplified asm_written
public SI size <integer_cst 0x7ffff7dc5ba0 32> unit size <integer_cst
0x7ffff7dc5bc0 4>
align 8 symtab -136395680 alias set 0 canonical type 0x7ffff7dd95e8
precision 32 min <integer_cst 0x7ffff7dc5ec0 -2147483648> max <integer_cst
0x7ffff7dc5ee0 2147483647>
pointer_to_this <pointer_type 0x7ffff7de72a0>>
used nonlocal decl_3 SI file
/tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/lto/20100423-3_0.C line 6 col 22
size <integer_cst 0x7ffff7dc5ba0 32> unit size <integer_cst 0x7ffff7dc5bc0 4>
align 8 offset_align 8
offset <integer_cst 0x7ffff7dc5be0 constant 0>
bit offset <integer_cst 0x7ffff7dc5c40 constant 0> context <union_type
0x7ffff7ef9738>> context <function_decl 0x7ffff7efb200 foo>
full-name "union<anonymous>"
pointer_to_this <pointer_type 0x7ffff7ef9d20> chain <type_decl
0x7ffff7ef32e0 ._0>>
(gdb) bt
#0 0x00000000004c6d17 in get_template_info (t=0x7ffff7ef9738) at
/tmp/hpautotest-gcc1/gcc/gcc/cp/pt.c:332
#1 0x00000000004c7276 in get_primary_template_innermost_parameters
(t=0x7ffff7ef9738)
at /tmp/hpautotest-gcc1/gcc/gcc/cp/pt.c:2900
#2 0x0000000000792161 in generic_type_p (type=<value optimized out>,
context_die=<value optimized out>,
usage=<value optimized out>) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:20045
#3 schedule_generic_params_dies_gen (type=<value optimized out>,
context_die=<value optimized out>,
usage=<value optimized out>) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:20055
#4 gen_struct_or_union_type_die (type=<value optimized out>,
context_die=<value optimized out>,
usage=<value optimized out>) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:18594
#5 0x000000000078cf49 in gen_tagged_type_die (type=0x7ffff7ef9738,
context_die=0x7ffff7dec410,
usage=DINFO_USAGE_DIR_USE) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:18802
#6 0x000000000077f3ef in gen_type_die_with_usage (type=0x7ffff7ef9738,
context_die=0x7ffff7dec4b0,
usage=DINFO_USAGE_DIR_USE) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:18952
#7 0x000000000078e3c5 in gen_decl_die (decl=0x7ffff7ef32e0, origin=0x0,
context_die=0x7ffff7dec4b0)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19512
#8 0x000000000077adb0 in decls_for_scope (stmt=0x7ffff7dec050,
context_die=0x7ffff7dec4b0, depth=1)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19125
#9 0x0000000000793771 in gen_lexical_block_die (stmt=0x7ffff7dec050,
context_die=<value optimized out>, depth=1)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:18111
#10 gen_block_die (stmt=0x7ffff7dec050, context_die=<value optimized out>,
depth=1)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19075
#11 0x000000000077ae3e in decls_for_scope (stmt=<value optimized out>,
context_die=0x7ffff7dec410,
depth=<value optimized out>) at
/tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19139
#12 0x000000000077b313 in gen_subprogram_die (decl=<value optimized out>,
context_die=<value optimized out>)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:17555
#13 0x000000000078e187 in gen_decl_die (decl=0x7ffff7efb200, origin=<value
optimized out>, context_die=0x7ffff7dec000)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19489
#14 0x000000000078f119 in dwarf2out_function_decl (decl=<value optimized out>)
at /tmp/hpautotest-gcc1/gcc/gcc/dwarf2out.c:19871
#15 0x00000000007d4a1d in rest_of_handle_final () at
/tmp/hpautotest-gcc1/gcc/gcc/final.c:4258
#16 0x00000000009358c2 in execute_one_pass (pass=0x1135b60) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2074
#17 0x0000000000935bd5 in execute_pass_list (pass=0x1135b60) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2129
#18 0x0000000000935be7 in execute_pass_list (pass=0x1136920) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2130
#19 0x0000000000935be7 in execute_pass_list (pass=0x11368c0) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2130
#20 0x0000000000a213f8 in tree_rest_of_compilation (fndecl=0x7ffff7efb200)
at /tmp/hpautotest-gcc1/gcc/gcc/tree-optimize.c:420
#21 0x00000000007263ea in cgraph_expand_function (node=0x7ffff7efe240)
at /tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1819
#22 0x0000000000729dfb in cgraph_output_in_order () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1984
#23 cgraph_optimize () at /tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:2192
#24 0x000000000072a14f in cgraph_finalize_compilation_unit () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1327
#25 0x000000000055472e in cp_write_global_declarations () at
/tmp/hpautotest-gcc1/gcc/gcc/cp/decl2.c:4049
#26 0x00000000009b551f in compile_file () at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:581
#27 do_compile () at /tmp/hpautotest-gcc1/gcc/gcc/toplev.c:1931
#28 0x00000000009b5b92 in toplev_main (argc=15, argv=0x7fffffffe058) at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:2007
#29 0x00000037d421eb1d in __libc_start_main () from /lib64/libc.so.6
#30 0x00000000004723d9 in _start ()
I hope I don't think I need to attach this (but that LTO thingy makes things
less certain):
inline int foo()
{
static union { int i; };
return i;
}
void bar()
{
foo();
}
CC to C++-people pointed out by gdb session cross-referenced with the changes
in the revision range.
There were several C++-related as well as a target-specific commit in the
quoted interval, and the first revision was from a regress-2230 state (to
regress-8, though the quoted test was not one of those in the former), so I'll
bisect, though it seems somewhat clear.
