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ad02e4fe87
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.
294 lines
8.0 KiB
Makefile
294 lines
8.0 KiB
Makefile
# Copyright (C) 1989-2016 Free Software Foundation, Inc.
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# This file is part of GDB.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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prefix = @prefix@
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exec_prefix = @exec_prefix@
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host_alias = @host_alias@
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target_alias = @target_alias@
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program_transform_name = @program_transform_name@
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bindir = @bindir@
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libdir = @libdir@
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tooldir = $(libdir)/$(target_alias)
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datadir = @datadir@
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localedir = @localedir@
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mandir = @mandir@
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man1dir = $(mandir)/man1
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man2dir = $(mandir)/man2
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man3dir = $(mandir)/man3
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man4dir = $(mandir)/man4
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man5dir = $(mandir)/man5
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man6dir = $(mandir)/man6
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man7dir = $(mandir)/man7
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man8dir = $(mandir)/man8
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man9dir = $(mandir)/man9
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infodir = @infodir@
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datarootdir = @datarootdir@
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docdir = @docdir@
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htmldir = @htmldir@
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pdfdir = @pdfdir@
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includedir = @includedir@
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SHELL = @SHELL@
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EXEEXT = @EXEEXT@
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INSTALL = @INSTALL@
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INSTALL_PROGRAM = @INSTALL_PROGRAM@
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INSTALL_DATA = @INSTALL_DATA@
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DESTDIR =
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AR = @AR@
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AR_FLAGS = qv
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RANLIB = @RANLIB@
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DLLTOOL = @DLLTOOL@
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SUBDIRS = import
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CLEANDIRS = $(SUBDIRS)
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REQUIRED_SUBDIRS = $(SUBDIRS)
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# If you are compiling with GCC, make sure that either 1) You have the
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# fixed include files where GCC can reach them, or 2) You use the
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# -traditional flag. Otherwise the ioctl calls in inflow.c
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# will be incorrectly compiled. The "fixincludes" script in the gcc
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# distribution will fix your include files up.
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CC=@CC@
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# Directory containing source files.
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srcdir = @srcdir@
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VPATH = @srcdir@
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CC_LD=$(CC)
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# CFLAGS is specifically reserved for setting from the command line
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# when running make. I.E. "make CFLAGS=-Wmissing-prototypes".
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CFLAGS = @CFLAGS@
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# LDFLAGS is specifically reserved for setting from the command line
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# when running make.
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LDFLAGS = @LDFLAGS@
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FLAGS_TO_PASS = \
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"prefix=$(prefix)" \
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"exec_prefix=$(exec_prefix)" \
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"infodir=$(infodir)" \
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"datarootdir=$(datarootdir)" \
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"docdir=$(docdir)" \
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"htmldir=$(htmldir)" \
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"pdfdir=$(pdfdir)" \
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"libdir=$(libdir)" \
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"mandir=$(mandir)" \
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"datadir=$(datadir)" \
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"includedir=$(includedir)" \
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"against=$(against)" \
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"DESTDIR=$(DESTDIR)" \
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"AR=$(AR)" \
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"AR_FLAGS=$(AR_FLAGS)" \
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"CC=$(CC)" \
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"CFLAGS=$(CFLAGS)" \
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"CXX=$(CXX)" \
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"CXXFLAGS=$(CXXFLAGS)" \
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"DLLTOOL=$(DLLTOOL)" \
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"LDFLAGS=$(LDFLAGS)" \
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"RANLIB=$(RANLIB)" \
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"MAKEINFO=$(MAKEINFO)" \
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"MAKEINFOFLAGS=$(MAKEINFOFLAGS)" \
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"MAKEINFO_EXTRA_FLAGS=$(MAKEINFO_EXTRA_FLAGS)" \
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"MAKEHTML=$(MAKEHTML)" \
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"MAKEHTMLFLAGS=$(MAKEHTMLFLAGS)" \
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"INSTALL=$(INSTALL)" \
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"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" \
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"INSTALL_DATA=$(INSTALL_DATA)" \
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"RUNTEST=$(RUNTEST)" \
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"RUNTESTFLAGS=$(RUNTESTFLAGS)"
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all installcheck check info install-info clean-info dvi pdf install-pdf html install-html: force
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@$(MAKE) $(FLAGS_TO_PASS) DO=$@ "DODIRS=$(SUBDIRS)" subdir_do
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# Traditionally "install" depends on "all". But it may be useful
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# not to; for example, if the user has made some trivial change to a
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# source file and doesn't care about rebuilding or just wants to save the
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# time it takes for make to check that all is up to date.
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# install-only is intended to address that need.
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install: all
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@$(MAKE) $(FLAGS_TO_PASS) install-only
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install-only: $(CONFIG_INSTALL)
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@$(MAKE) DO=install "DODIRS=$(SUBDIRS)" $(FLAGS_TO_PASS) subdir_do
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uninstall: force $(CONFIG_UNINSTALL)
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@$(MAKE) DO=uninstall "DODIRS=$(SUBDIRS)" $(FLAGS_TO_PASS) subdir_do
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# Convenience rule to handle recursion.
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$(LIBGNU) $(GNULIB_H): all-lib
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all-lib: import/Makefile
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@$(MAKE) $(FLAGS_TO_PASS) DO=all DODIRS=import subdir_do
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.PHONY: all-lib
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clean mostlyclean: $(CONFIG_CLEAN)
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@$(MAKE) $(FLAGS_TO_PASS) DO=clean "DODIRS=$(CLEANDIRS)" subdir_do
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distclean: clean
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@$(MAKE) $(FLAGS_TO_PASS) DO=distclean "DODIRS=$(CLEANDIRS)" subdir_do
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rm -f config.status config.h stamp-h
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rm -f config.log config.cache
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rm -f Makefile
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rm -rf $(DEPDIR)
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maintainer-clean: local-maintainer-clean do-maintainer-clean distclean
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realclean: maintainer-clean
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local-maintainer-clean:
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@echo "This command is intended for maintainers to use;"
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@echo "it deletes files that may require special tools to rebuild."
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rm -f config.status
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do-maintainer-clean:
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@$(MAKE) $(FLAGS_TO_PASS) DO=maintainer-clean "DODIRS=$(CLEANDIRS)" \
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subdir_do
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subdir_do: force
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@for i in $(DODIRS); do \
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case $$i in \
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$(REQUIRED_SUBDIRS)) \
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if [ ! -f ./$$i/Makefile ] ; then \
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echo "Missing $$i/Makefile" >&2 ; \
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exit 1 ; \
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fi ;; \
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esac ; \
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if [ -f ./$$i/Makefile ] ; then \
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if (cd ./$$i; \
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$(MAKE) $(FLAGS_TO_PASS) $(DO)) ; then true ; \
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else exit 1 ; fi ; \
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else true ; fi ; \
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done
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Makefile: Makefile.in config.status
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# Regenerate the Makefile.
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CONFIG_FILES="Makefile" \
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CONFIG_COMMANDS= \
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CONFIG_HEADERS= \
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$(SHELL) config.status
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gnulib/Makefile: gnulib/Makefile.in config.status
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CONFIG_FILES="gnulib/Makefile" \
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CONFIG_COMMANDS="depfiles" \
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CONFIG_HEADERS= \
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CONFIG_LINKS= \
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$(SHELL) config.status
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config.h: stamp-h ; @true
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stamp-h: $(srcdir)/config.in config.status
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CONFIG_HEADERS=config.h:config.in \
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CONFIG_COMMANDS="default depdir" \
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CONFIG_FILES= \
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CONFIG_LINKS= \
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$(SHELL) config.status
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config.status: $(srcdir)/configure
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$(SHELL) config.status --recheck
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ACLOCAL = aclocal
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ACLOCAL_AMFLAGS = -I import/m4 -I ../../config
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aclocal_m4_deps = \
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configure.ac \
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import/m4/00gnulib.m4 \
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import/m4/alloca.m4 \
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import/m4/codeset.m4 \
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import/m4/configmake.m4 \
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import/m4/extensions.m4 \
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import/m4/fcntl-o.m4 \
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import/m4/fnmatch.m4 \
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import/m4/glibc21.m4 \
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import/m4/gnulib-cache.m4 \
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import/m4/gnulib-common.m4 \
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import/m4/gnulib-comp.m4 \
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import/m4/gnulib-tool.m4 \
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import/m4/include_next.m4 \
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import/m4/inttypes-pri.m4 \
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import/m4/inttypes.m4 \
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import/m4/localcharset.m4 \
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import/m4/locale-fr.m4 \
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import/m4/locale-ja.m4 \
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import/m4/locale-zh.m4 \
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import/m4/longlong.m4 \
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import/m4/mbrtowc.m4 \
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import/m4/mbsinit.m4 \
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import/m4/mbsrtowcs.m4 \
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import/m4/mbstate_t.m4 \
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import/m4/memchr.m4 \
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import/m4/memmem.m4 \
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import/m4/mmap-anon.m4 \
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import/m4/multiarch.m4 \
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import/m4/off_t.m4 \
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import/m4/pathmax.m4 \
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import/m4/ssize_t.m4 \
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import/m4/stdbool.m4 \
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import/m4/stddef_h.m4 \
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import/m4/stdint.m4 \
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import/m4/string_h.m4 \
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import/m4/strtok_r.m4 \
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import/m4/sys_types_h.m4 \
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import/m4/unistd_h.m4 \
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import/m4/warn-on-use.m4 \
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import/m4/wchar_h.m4 \
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import/m4/wchar_t.m4 \
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import/m4/wctype_h.m4 \
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import/m4/wint_t.m4
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$(srcdir)/aclocal.m4: @MAINTAINER_MODE_TRUE@ $(aclocal_m4_deps)
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cd $(srcdir) && $(ACLOCAL) $(ACLOCAL_AMFLAGS)
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AUTOCONF = autoconf
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configure_deps = $(srcdir)/configure.ac $(srcdir)/aclocal.m4
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$(srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(configure_deps)
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cd $(srcdir) && $(AUTOCONF)
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AUTOHEADER = autoheader
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$(srcdir)/config.in: @MAINTAINER_MODE_TRUE@ $(configure_deps)
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cd $(srcdir) && $(AUTOHEADER)
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rm -f stamp-h
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touch $@
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# automatic rebuilding in automake-generated Makefiles requires
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# this rule in the toplevel Makefile, which, with GNU make, causes
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# the desired updates through the implicit regeneration of the Makefile
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# and all of its prerequisites.
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am--refresh:
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@:
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force:
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force_update:
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# GNU Make has an annoying habit of putting *all* the Makefile variables
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# into the environment, unless you include this target as a circumvention.
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# Rumor is that this will be fixed (and this target can be removed)
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# in GNU Make 4.0.
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.NOEXPORT:
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# GNU Make 3.63 has a different problem: it keeps tacking command line
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# overrides onto the definition of $(MAKE). This variable setting
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# will remove them.
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MAKEOVERRIDES=
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# Disable implicit make rules.
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include $(srcdir)/../disable-implicit-rules.mk
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### end of the libgnu Makefile.in.
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