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Simon Marchi 6242c6a690 darwin: Don't use sbrk 
This patch gets rid of this warning on macOS:

    CXX    main.o
  /Users/simark/src/binutils-gdb/gdb/main.c:492:27: error: 'sbrk' is deprecated [-Werror,-Wdeprecated-declarations]
    lim_at_start = (char *) sbrk (0);
                            ^
  /usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly marked deprecated here
  __deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
  ^
  /usr/include/sys/cdefs.h:176:37: note: expanded from macro '__deprecated'
  #define __deprecated    __attribute__((deprecated))
                                         ^

sbrk on macOS is not useful for our purposes, since sbrk(0) always
returns the same value.  From what I read, brk/sbrk on macOS is just an
emulation, it always returns a pointer in a 4MB section reserved for
that.

So instead of letting users use "maint set per-command space on" and
print silly results, I think we should just disable that feature for
this platform (as we do for platforms that don't have sbrk).

I defined a HAVE_USEFUL_SBRK macro and used that instead of HAVE_SBRK.

gdb/ChangeLog:

	* common/common-defs.h (HAVE_USEFUL_SBRK): Define.
	* main.c: Use HAVE_USEFUL_SBRK instead of HAVE_SBRK.
	* maint.c: Likewise.
	* top.c: Likewise.
 		2018-07-04 12:40:25 -04:00
..
agent.c Remove ptid_equal 2018-07-03 11:36:46 -06:00
agent.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
array-view.h Add selftests for range_contains and insert_into_bit_range_vector 2018-04-09 15:47:12 -04:00
ax.def Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
break-common.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
btrace-common.c Remove cleanups from btrace code 2018-06-08 07:05:49 -06:00
btrace-common.h Remove cleanups from btrace code 2018-06-08 07:05:49 -06:00
buffer.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
buffer.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
byte-vector.h Make target_read_alloc & al return vectors 2018-04-07 13:19:12 -04:00
cleanups.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
cleanups.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-debug.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-debug.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-defs.h darwin: Don't use sbrk 2018-07-04 12:40:25 -04:00
common-exceptions.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-exceptions.h Mark END_CATCH as ATTRIBUTE_NORETURN (-Wmaybe-uninitialized warnings) 2018-05-30 14:18:47 +01:00
common-gdbthread.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-inferior.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-regcache.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-regcache.h Add regcache raw_compare method 2018-06-11 10:09:30 +01:00
common-types.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
common-utils.c aarch64: PR 19806: watchpoints: false negatives + PR 20207 contiguous ones 2018-05-04 22:26:46 +02:00
common-utils.h aarch64: PR 19806: watchpoints: false negatives + PR 20207 contiguous ones 2018-05-04 22:26:46 +02:00
common.host Add common/ dir in build directories 2018-02-19 09:37:24 +00:00
common.m4 Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
create-version.sh Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
def-vector.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
default-init-alloc.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
enum-flags.h Fix typo in common/enum-flags.h example 2018-06-05 18:22:25 +01:00
environ.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
environ.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
errors.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
errors.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
fileio.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
fileio.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
filestuff.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
filestuff.h Remove do_closedir_cleanup 2018-05-04 12:20:37 -06:00
format.c Make format_pieces recognize the \e escape sequence 2018-05-17 13:06:11 -04:00
format.h Make format_pieces recognize the \e escape sequence 2018-05-17 13:06:11 -04:00
function-view.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_assert.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_locale.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_optional.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_ref_ptr.h Introduce ref_ptr::new_reference 2018-04-30 11:33:11 -06:00
gdb_setjmp.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_signals.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_splay_tree.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_string_view.h Add gdb::string_view 2018-04-09 14:20:46 -04:00
gdb_string_view.tcc Add gdb::string_view 2018-04-09 14:20:46 -04:00
gdb_sys_time.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_tilde_expand.c Create new common/pathstuff.[ch] 2018-02-28 11:34:39 -05:00
gdb_tilde_expand.h Create new common/pathstuff.[ch] 2018-02-28 11:34:39 -05:00
gdb_unique_ptr.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_unlinker.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
gdb_vecs.c Remove free_char_ptr_vec 2018-03-02 23:22:10 -05:00
gdb_vecs.h Remove const_char_ptr typedef 2018-05-29 08:52:55 -06:00
gdb_wait.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
hash_enum.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
host-defs.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
job-control.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
job-control.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
mingw-strerror.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
new-op.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
observable.h Convert observers to C++ 2018-03-19 09:37:49 -06:00
offset-type.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
pathstuff.c Conditionally include "<windows.h>" on common/pathstuff.c (and unbreak build on mingw*) 2018-03-02 07:32:31 -05:00
pathstuff.h Make gdbserver work with filename-only binaries 2018-02-28 11:37:10 -05:00
poison.h Introduce obstack_new, poison other "typed" obstack functions 2018-05-20 21:06:36 -04:00
posix-strerror.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
preprocessor.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
print-utils.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
print-utils.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
ptid.c Remove ptid_equal 2018-07-03 11:36:46 -06:00
ptid.h Remove ptid_equal 2018-07-03 11:36:46 -06:00
queue.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
refcounted-object.h Use thread_info and inferior pointers more throughout 2018-06-21 17:09:31 +01:00
rsp-low.c Get rid of VEC(static_tracepoint_marker_p) 2018-03-22 00:27:19 -04:00
rsp-low.h Get rid of VEC(static_tracepoint_marker_p) 2018-03-22 00:27:19 -04:00
run-time-clock.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
run-time-clock.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
scoped_fd.h common: add scoped_fd 2018-02-09 14:03:18 +01:00
scoped_mmap.h common: add scoped_mmap 2018-02-09 14:03:19 +01:00
scoped_restore.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
selftest.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
selftest.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
signals-state-save-restore.c gdb/common/signals-state-save-restore.c: Fix typos 2018-01-15 20:03:20 +00:00
signals-state-save-restore.h Fix regression: cannot start with LD_PRELOAD=libSegFault.so (PR gdb/18653#c7) 2018-01-05 18:26:18 +00:00
signals.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
symbol.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
tdesc.c Create xml from target descriptions 2018-04-18 20:44:39 +01:00
tdesc.h Remove xml file references from target descriptions 2018-04-18 20:49:37 +01:00
traits.h Fix copy-pasto, allocate objfile_per_bfd_storage with obstack_new 2018-05-20 23:19:35 -04:00
underlying.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
valid-expr.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
vec.c Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
vec.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
version.h Update copyright year range in all GDB files 2018-01-02 07:38:06 +04:00
x86-xstate.h gdb/x86: Handle kernels using compact xsave format 2018-05-08 18:03:46 +01:00
xml-utils.c Add xml_escape_text_append and use it 2018-03-08 18:04:46 -05:00
xml-utils.h Add xml_escape_text_append and use it 2018-03-08 18:04:46 -05:00