Makefiles: Flatten and sort file lists

I find the big file lists in the Makefiles a bit ugly and not very
practical.  Since there are multiple filenames on each line (as much as
fits in 80 columns), it's not easy to add, remove or change a name in
the middle.  As a result, we have a mix of long and short lines in no
particular order (ALL_TARGET_OBS is a good example).

I therefore suggest flattening the lists (one name per line) and keeping
them in alphabetical order.  The diffs will be much clearer and merge
conflicts will be easier to resolve.

A nice (IMO) side-effect I observed is that the files are compiled
alphabetically by make, so it gives a rough idea of the progress of the
build.

I added a comment in gdb/Makefile.in to mention to keep the file lists
ordered, and gave the general guidelines on what order to respect.  I
added a comment in other Makefiles which refers to gdb/Makefile.in, to
avoid duplication.

Running the patch through the buildbot found that gdb.base/default.exp
started to fail.  The languages in the error message shown when typing
"set language" have changed order.  We could probably improve gdb so
that it prints them in a stable order, regardless of the order of the
object list passed to the linked, but just fixing the test is easier for
now.

New in v2:

 - Change ordering style, directories go at the end.
 - Cleanup gdbserver's and data-directory's Makefile as well.
 - Add comments at top of Makefiles about the ordering.
 - Remove wrong trailing backslahes.
 - Fix test gdb.base/default.exp.

gdb/ChangeLog:

	* Makefile.in: Add comment about file lists ordering.
	(SUBDIR_CLI_OBS, SUBDIR_CLI_SRCS, SUBDIR_MI_OBS, SUBDIR_MI_SRCS,
	SUBDIR_TUI_OBS, SUBDIR_TUI_SRCS, SUBDIR_GCC_COMPILE_OBS,
	SUBDIR_GCC_COMPILE_SRCS, SUBDIR_GUILE_OBS, SUBDIR_GUILE_SRCS,
	SUBDIR_PYTHON_OBS, SUBDIR_PYTHON_SRCS, SUBDIR_GDBTK_OBS,
	SUBDIR_GDBTK_SRCS, XMLFILES, REMOTE_OBS, ALL_64_TARGET_OBS,
	ALL_TARGET_OBS, SFILES, HFILES_NO_SRCDIR, HFILES_WITH_SRCDIR,
	COMMON_OBS, YYFILES, YYOBJ, generated_files, ALLDEPFILES):
	Flatten list and order alphabetically.
	* data-directory/Makefile.in: Add comment about file lists
	ordering.
	(GEN_SYSCALLS_FILES, PYTHON_FILE_LIST): Flatten list and order
	alphabetically.

gdb/gdbserver/ChangeLog:

	* Makefile.in (SFILES, OBS): Flatten list and order
	alphabetically.

gdb/testsuite/ChangeLog:

	* gdb.base/default.exp: Fix output of "set language".

1 files changed, 25 insertions, 14 deletions

diff --git a/gdb/data-directory/Makefile.in b/gdb/data-directory/Makefile.in
index 3f235168762..51b5c2ab408 100644
--- a/gdb/data-directory/Makefile.in
+++ b/gdb/data-directory/Makefile.in
@@ -16,6 +16,9 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# Please keep lists in this file sorted alphabetically, with one item per line.
+# See gdb/Makefile.in for guidelines on ordering files and directories.
+
 srcdir = @srcdir@
 SYSCALLS_SRCDIR = $(srcdir)/../syscalls
 PYTHON_SRCDIR = $(srcdir)/../python/lib
@@ -45,12 +48,20 @@ GDB_DATADIR = @GDB_DATADIR@
 
 SYSCALLS_DIR = syscalls
 SYSCALLS_INSTALL_DIR = $(DESTDIR)$(GDB_DATADIR)/$(SYSCALLS_DIR)
-GEN_SYSCALLS_FILES = arm-linux.xml aarch64-linux.xml \
-	ppc-linux.xml ppc64-linux.xml \
-	i386-linux.xml amd64-linux.xml \
-	sparc-linux.xml sparc64-linux.xml \
-	mips-o32-linux.xml mips-n32-linux.xml mips-n64-linux.xml \
-	s390-linux.xml s390x-linux.xml
+GEN_SYSCALLS_FILES = \
+	aarch64-linux.xml \
+	amd64-linux.xml \
+	arm-linux.xml \
+	i386-linux.xml \
+	mips-n32-linux.xml \
+	mips-n64-linux.xml \
+	mips-o32-linux.xml \
+	ppc-linux.xml \
+	ppc64-linux.xml \
+	s390-linux.xml \
+	s390x-linux.xml \
+	sparc-linux.xml \
+	sparc64-linux.xml
 
 SYSCALLS_FILES = gdb-syscalls.dtd freebsd.xml $(GEN_SYSCALLS_FILES)
 
@@ -58,22 +69,22 @@ PYTHON_DIR = python
 PYTHON_INSTALL_DIR = $(DESTDIR)$(GDB_DATADIR)/$(PYTHON_DIR)
 PYTHON_FILE_LIST = \
 	gdb/__init__.py \
-	gdb/frames.py \
-	gdb/FrameIterator.py \
 	gdb/FrameDecorator.py \
-	gdb/types.py \
+	gdb/FrameIterator.py \
+	gdb/frames.py \
 	gdb/printing.py \
-	gdb/unwinder.py \
 	gdb/prompt.py \
+	gdb/types.py \
+	gdb/unwinder.py \
 	gdb/xmethod.py \
 	gdb/command/__init__.py \
-	gdb/command/xmethods.py \
+	gdb/command/explore.py \
 	gdb/command/frame_filters.py \
-	gdb/command/unwinders.py \
-	gdb/command/type_printers.py \
 	gdb/command/pretty_printers.py \
 	gdb/command/prompt.py \
-	gdb/command/explore.py \
+	gdb/command/type_printers.py \
+	gdb/command/unwinders.py \
+	gdb/command/xmethods.py \
 	gdb/function/__init__.py \
 	gdb/function/as_string.py \
 	gdb/function/caller_is.py \