Package: src:gnat-4.9
Followup-For: Bug #742590
When compiling a-direct.adb on partch.debian.org, the failure appears
with -O[12] but not with -O0. Gdb shows that it happens in the gnat1
subprocess and produces a backtrace.
$ gdb ../../xgcc
(gdb) set args -B../.. -c -O1 -gnatpg a-direct.adb -o a-direct.o
(gdb) set follow-fork-mode child
(gdb) run
[ New process ]
Program received signal SIGSEGV, Segmentation fault.
0x1065cb10 in emit_move_insn(rtx_def*, rtx_def*) ()
(gdb) bt
#0 0x1065cb10 in emit_move_insn(rtx_def*, rtx_def*) ()
#1 0x1065de2c in convert_move(rtx_def*, rtx_def*, int) ()
#2 0x1065e2a0 in convert_modes(machine_mode, machine_mode, rtx_def*,
int) ()
#3 0x10667f00 in expand_expr_real_2(separate_ops*, rtx_def*,
machine_mode, expand_modifier) ()
#4 0x10659114 in expand_expr_real_1(tree_node*, rtx_def*,
machine_mode, expand_modifier, rtx_def**, bool) ()
#5 0x1065a590 in expand_expr_real_1(tree_node*, rtx_def*,
machine_mode, expand_modifier, rtx_def**, bool) ()
#6 0x10664448 in store_expr(tree_node*, rtx_def*, int, bool) ()
#7 0x106690e4 in expand_assignment(tree_node*, tree_node*, bool) ()
#8 0x10579f58 in expand_gimple_stmt(gimple_statement_base*) ()
#9 0x1057b57c in expand_gimple_basic_block(basic_block_def*, bool) ()
#10 0x1057d74c in (anonymous namespace)::pass_expand::execute() ()
#11 0x107e7bc4 in execute_one_pass(opt_pass*) ()
#12 0x107e7e44 in execute_pass_list(opt_pass*) ()
#13 0x105a4e08 in expand_function(cgraph_node*) ()
#14 0x105a6c44 in compile() ()
#15 0x105a7244 in finalize_compilation_unit() ()
#16 0x101e11a4 in gnat_write_global_declarations() ()
#17 0x108a0254 in compile_file() ()
#18 0x108a25d8 in toplev_main(int, char**) ()
#19 0x0fa4f274 in generic_start_main (main=0x101b6550 <main>, argc=14,
argv=0xffffe5f4, auxvec=0xffffe690, init=<optimized out>,
rtld_fini=<optimized out>, stack_end=<optimized out>,
fini=<optimized out>) at ../csu/libc-start.c:287
#20 0x0fa4f434 in __libc_start_main (argc=<optimized out>,
argv=<optimized out>, ev=<optimized out>, auxvec=<optimized out>,
rtld_fini=<optimized out>, stinfo=<optimized out>,
stack_on_entry=<optimized out>)
at ../sysdeps/unix/sysv/linux/powerpc/libc-start.c:93
#21 0x00000000 in ?? ()
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