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Simon Marchi ad02e4fe87 Makefiles: Disable suffix rules and implicit rules
Since we don't use suffix rules nor implicit rules in gdb, we can
disable them.  The advantage is a slightly faster make [1].

Here are some numbers about the speedup.  I ran this on my trusty old
Intel Q6600, so the time numbers are probably higher than what you'd get
on any recent hardware.  I ran "make" in the gdb/ directory of an
already built repository (configured with --enable-targets=all).  I
recorded the time of execution (average of 5).  I then ran "make -d" and
recorded the number of printed lines, which gives a rough idea of the
number of operations done.

I compared the following configurations, to see the impact of both the
empty .SUFFIXES target and the empty pattern rules, as well as running
"make -r", which can be considered the "ideal" case.

 A - baseline
 B - baseline + .SUFFIXES
 C - baseline + pattern rules
 D - baseline + .SUFFIXES + pattern rules
 E - baseline + make -r

 config | time (s) | "make -d"
 -----------------------------
    A   |   5.74   |  2396643
    B   |   1.19   |   298469
    C   |   2.81   |  1266573
    D   |   1.13   |   245489
    E   |   1.01   |   163914

We can see that the empty .SUFFIXES target has a bigger impact than the
empty pattern rules, but still it doesn't hurt to disable the implicit
pattern rules as well.

There are still some mentions of implicit rules I can't get rid of in
the "make -d" output.  For example, it's trying to build .c files from
.w files:

  Looking for an implicit rule for '/home/simark/src/binutils-gdb/gdb/infrun.c'.
  Trying pattern rule with stem 'infrun'.
  Trying implicit prerequisite '/home/simark/src/binutils-gdb/gdb/infrun.w'.

and trying to build Makefile.in from a bunch of extensions:

  Looking for an implicit rule for 'Makefile.in'.
  Trying pattern rule with stem 'Makefile.in'.
  Trying implicit prerequisite 'Makefile.in.o'.
  Trying pattern rule with stem 'Makefile.in'.
  Trying implicit prerequisite 'Makefile.in.c'.
  Trying pattern rule with stem 'Makefile.in'.
  Trying implicit prerequisite 'Makefile.in.cc'.
  ... many more ...

If somebody knows how to disable them, we can do it, but at this point
the returns are minimal, so it is not that important.

I verified that both in-tree and out-of-tree builds work.

[1] Switching from explicit rules to pattern rules for files in
    subdirectories actually made it slower, so this is kind of a way to
    redeem myself.  But it the end it's faster than it was previously,
    so it was all worth it. :)

gdb/ChangeLog:

	* disable-implicit-rules.mk: New file.
	* Makefile.in: Include disable-implicit-rules.mk.
	* data-directory/Makefile.in: Likewise.
	* gnulib/Makefile.in: Likewise.

gdb/doc/ChangeLog:

	* Makefile.in: Likewise.

gdb/gdbserver/ChangeLog:

	* Makefile.in: Include disable-implicit-rules.mk.

gdb/testsuite/ChangeLog:

	* Makefile.in: Include disable-implicit-rules.mk.
2016-11-30 16:23:59 -05:00
bfd Revert accidental elf.c change 2016-11-30 22:12:00 +10:30
binutils Stop readelf from complaining about out of order PT_LOAD segments. 2016-11-30 11:06:42 +00:00
config Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
cpu Add fall through comment to source in cpu/ 2016-10-06 22:48:37 +10:30
elfcpp Add support for MIPS .rld_map section. 2016-06-20 12:16:26 -07:00
etc Fix compile time warning messages building with gcc v6.1.1 2016-06-13 10:49:26 +01:00
gas [ARC] Add checking for LP_COUNT reg usage, improve error reporting. 2016-11-29 11:29:18 +01:00
gdb Makefiles: Disable suffix rules and implicit rules 2016-11-30 16:23:59 -05:00
gold Fix spelling in comments in .def files (gold) 2016-11-27 15:09:18 +10:30
gprof Fix spelling in comments in C source files (gprof) 2016-11-27 15:04:01 +10:30
include [ARC] Add checking for LP_COUNT reg usage, improve error reporting. 2016-11-29 11:29:18 +01:00
intl Regen intl/configure 2015-08-31 12:53:36 +09:30
ld arc/ld: Remove duplicate TEMPLATE_NAME from emulparam file 2016-11-28 22:30:17 +00:00
libdecnumber Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
libiberty libiberty: Add Rust symbol demangling. 2016-11-18 11:06:18 +01:00
opcodes [ARC] Add checking for LP_COUNT reg usage, improve error reporting. 2016-11-29 11:29:18 +01:00
readline Improve MinGW support in Readline 2016-09-17 11:50:37 +03:00
sim sim: mips: add PR info to ChangeLog 2016-11-12 01:02:23 -05:00
texinfo
zlib Regenerate configure 2016-05-09 17:24:30 +09:30
.cvsignore
.gitattributes Add a .gitattributes file for use with git-merge-changelog 2014-07-25 18:07:23 -04:00
.gitignore Add archives and make stamps to the .gitignore file. 2016-09-27 15:10:42 +01:00
ChangeLog Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in Sync toplevel files with GCC 2015-07-27 07:49:05 -07:00
config.guess Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
config.rpath
config.sub Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
configure Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
configure.ac Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.in Add dependencies to configure rule 2016-05-28 22:36:04 +09:30
Makefile.tpl Add dependencies to configure rule 2016-05-28 22:36:04 +09:30
makefile.vms
missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
mkdep
mkinstalldirs Update from upstream Automake 2014-11-16 13:43:48 +01:00
move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
README
README-maintainer-mode
setup.com
src-release.sh fix gdb version parsing in src-release.sh 2016-01-17 10:01:55 +04:00
symlink-tree
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.