[Bug gdb/18653] spawn changes SIGPIPE SIG_DFL to SIG_IGN

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18653

--- Comment #8 from Pedro Alves <palves at redhat dot com> ---
Indeed, we get:

(top-gdb) bt
#0  0x000000000056b001 in internal_error(char const*, int, char const*, ...)
(file=0xaf5f38 "src/gdb/common/signals-state-save-restore.c", line=64,
fmt=0xaf5f18 "unexpected signal handler") at src/gdb/common/errors.c:54
#1  0x00000000005752c9 in save_original_signals_state() () at
src/gdb/common/signals-state-save-restore.c:64
#2  0x00000000007425de in captured_main_1(captured_main_args*)
(context=0x7fffffffd860)
    at src/gdb/main.c:509
#3  0x0000000000743622 in captured_main(void*) (data=0x7fffffffd860) at
src/gdb/main.c:1145
During symbol reading, cannot get low and high bounds for subprogram DIE at
24065.
#4  0x00000000007436f9 in gdb_main(captured_main_args*) (args=0x7fffffffd860)
at src/gdb/main.c:1171
#5  0x0000000000413acd in main(int, char**) (argc=1, argv=0x7fffffffd968) at
src/gdb/gdb.c:32

How about this?  Too noisy?

~~~~~~~~~~~~~~~~~~~~~
$ LD_PRELOAD=/usr/lib64/libSegFault.so  ./gdb ~/gdb/tests/threads
warning: Found custom handler for signal 11 (Segmentation fault) preinstalled.
Some signal dispositions inherited from the environment (SIG_DFL/SIG_IGN)
won't be propagated to spawned programs.
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Reading symbols from /home/pedro/gdb/tests/threads...done.
(gdb)
~~~~~~~~~~~~~~~~~~~~~

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