[Bug c++/17685] segmentation fault when trying to print a templated type

["thomas at loockx dot be" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17685

--- Comment #2 from thomas at loockx dot be ---
Here's a less sloppy report.

GDB version used to reproduces the crash (downloaded and build from the
website):

thomas@thomas-work-pc:~/Downloads/gdb-7.8.1/gdb$ ./gdb --version
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Here's a backtrace I captured by running the compiled gdb in the gdb on my
system (GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1):

Breakpoint 1, main (argc=1, argv=0x7fffffffde58) at gdb-crash.cpp:16
16          return 0;
(gdb) p test

Program received signal SIGSEGV, Segmentation fault.
0x00000000004f59c6 in value_entirely_optimized_out (value=0x0) at value.c:1261
1261      if (!value->optimized_out)
(gdb) bt
#0  0x00000000004f59c6 in value_entirely_optimized_out (value=0x0) at
value.c:1261
#1  0x000000000060a1fe in cp_print_static_field (options=<optimized out>,
recurse=<optimized out>, stream=<optimized out>, val=<optimized out>, type=0x0)
at cp-valprint.c:643
#2  cp_print_value_fields (type=<optimized out>, real_type=<optimized out>,
valaddr=<optimized out>, offset=<optimized out>, address=<optimized out>,
stream=<optimized out>, recurse=0, val=0xdd0000, 
    options=0x7fffffffd830, dont_print_vb=0x0, dont_print_statmem=0) at
cp-valprint.c:336
#3  0x000000000060a7e2 in cp_print_value_fields_rtti (type=0xc57480,
valaddr=0xd13a00 "", offset=0, address=140737488346464, stream=<optimized out>,
recurse=0, val=0xdd0000, options=0x7fffffffd830, 
    dont_print_vb=0x0, dont_print_statmem=0) at cp-valprint.c:456
#4  0x0000000000608cf7 in c_val_print (type=0xc57480, valaddr=<optimized out>,
embedded_offset=0, address=<optimized out>, stream=0xc40cc0, recurse=<optimized
out>, original_value=0xdd0000, 
    options=0x7fffffffd830) at c-valprint.c:394
#5  0x000000000050e66b in val_print (type=<optimized out>, valaddr=<optimized
out>, embedded_offset=<optimized out>, address=<optimized out>,
stream=<optimized out>, recurse=<optimized out>, val=0xdd0000, 
    options=0x7fffffffd8e0, language=0x7b1040 <cplus_language_defn>) at
valprint.c:790
#6  0x0000000000608870 in c_value_print (val=0xdd0000, stream=0xc40cc0,
options=<optimized out>) at c-valprint.c:585
#7  0x000000000051208e in print_command_1 (exp=0xb63192 "test",
voidprint=<optimized out>) at ./printcmd.c:997
#8  0x0000000000617dc0 in execute_command (p=0xb63190 "p test", from_tty=1) at
top.c:479
#9  0x00000000005573f5 in command_handler (command=0xb63190 "p test") at
event-top.c:484
#10 0x0000000000557ffc in command_line_handler (rl=<optimized out>) at
event-top.c:681
#11 0x0000000000664feb in rl_callback_read_char () at callback.c:220
#12 0x0000000000557469 in rl_callback_read_char_wrapper (client_data=0x0) at
event-top.c:167
#13 0x0000000000556264 in process_event () at event-loop.c:343
#14 0x00000000005571f4 in gdb_do_one_event () at event-loop.c:407
#15 0x0000000000557255 in start_event_loop () at event-loop.c:432
#16 0x000000000054fe93 in captured_command_loop (data=0x0) at main.c:303
#17 0x000000000054cb4b in catch_errors (func=<optimized out>,
func_args=<optimized out>, errstring=<optimized out>, mask=<optimized out>) at
exceptions.c:506
#18 0x0000000000550bc6 in captured_main (data=<optimized out>) at main.c:1164
#19 0x000000000054cb4b in catch_errors (func=<optimized out>,
func_args=<optimized out>, errstring=<optimized out>, mask=<optimized out>) at
exceptions.c:506
#20 0x000000000054fcfb in gdb_main (args=0xffffffff) at main.c:1172
#21 0x0000000000406d65 in main (argc=<optimized out>, argv=0xffffffff) at
gdb.c:33
(gdb) 

Looks to me that value is a NULL ptr.

I've attached the updated test program with a proper return statement.

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