GNUmakefile

   1 # Maintainer makefile for Automake.  Requires GNU make.
   2
   3 # Copyright (C) 2012-2013 Free Software Foundation, Inc.
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2, or (at your option)
   8 # any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 ifeq ($(filter bootstrap,$(MAKECMDGOALS)),)
  19
  20 ifeq ($(wildcard Makefile),)
  21   # Any target but 'bootstrap' specified in an unconfigured tree
  22   # is an error, even when the user is running GNU make.
  23   $(warning There seems to be no Makefile in this directory.)
  24   $(warning You must run ./configure before running 'make'.)
  25   $(error Fatal Error)
  26 endif
  27 include ./Makefile
  28 include $(srcdir)/maint.mk
  29 include $(srcdir)/syntax-checks.mk
  30
  31 else # ! bootstrap in $(MAKECMDGOALS)
  32
  33 other-targets := $(filter-out bootstrap,$(MAKECMDGOALS))
  34 config-status := $(wildcard ./config.status)
  35
  36 BOOTSTRAP_SHELL ?= /bin/sh
  37 export BOOTSTRAP_SHELL
  38
  39 # Allow the user (or more likely the developer) to ask for a bootstrap
  40 # of the package.
  41 #
  42 # Two issues that must be kept in mind in the implementation below:
  43 #
  44 #  [1] "make bootstrap" can be invoked before 'configure' is run (and in
  45 #      fact, even before it is created, if we are bootstrapping from a
  46 #      freshly-cloned checkout).
  47 #
  48 #  [2] When re-bootstrapping an already configured tree, we must ensure
  49 #      that the automatic remake rules for Makefile and company do not
  50 #      kick in, because the tree might be in an inconsistent state (e.g.,
  51 #      we have just switched from 'maint' to 'master', and have the built
  52 #      'automake' script left from 'maint', but the files 'lib/am/*.am'
  53 #      are from 'master': if 'automake' gets run and used those files --
  54 #      boom!).
  55
  56 ifdef config-status # Bootstrap from an already-configured tree.
  57   # We need the definition of $(srcdir) in the 'bootstrap' rule
  58   # below.
  59   srcdir := $(shell echo @srcdir@ | $(config-status) --file=-)
  60   ifndef srcdir
  61     $(error Could not obtain $$(srcdir) from $(config-status))
  62   endif
  63   # Also, if we are re-bootstrapping an already-configured tree, we
  64   # want to re-configure it with the same pre-existing configuration.
  65   old-configure-flags := $(shell $(config-status) --config)
  66 else # Assume we are bootstrapping from an unconfigured srcdir.
  67   srcdir := .
  68   old-configure-flags :=
  69 endif
  70
  71 configure-flags := $(old-configure-flags) $(BOOTSTRAP_CONFIGURE_FLAGS)
  72
  73 .PHONY: bootstrap
  74 bootstrap:
  75         cd $(srcdir) && $(SHELL) ./bootstrap.sh
  76         $(srcdir)/configure $(configure-flags)
  77         $(MAKE) clean
  78         $(MAKE) check TESTS=t/get-sysconf
  79
  80 # Ensure that all the specified targets but 'bootstrap' (if any) are
  81 # run with a properly re-bootstrapped tree.
  82 ifdef other-targets
  83 $(other-targets): restart
  84 .PHONY: $(other-targets) restart
  85 restart: bootstrap; $(MAKE) $(AM_MAKEFLAGS) $(other-targets)
  86 endif
  87
  88 endif # ! bootstrap in $(MAKECMDGOALS)