GNUmakefile

   1 # Maintainer makefile for Automake.  Requires GNU make.
   2
   3 # Copyright (C) 2012 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)/syntax-checks.mk
  29
  30 else # ! bootstrap in $(MAKECMDGOALS)
  31
  32 other-targets := $(filter-out bootstrap,$(MAKECMDGOALS))
  33 config-status := $(wildcard ./config.status)
  34
  35 BOOTSTRAP_SHELL ?= /bin/sh
  36 export BOOTSTRAP_SHELL
  37
  38 # Allow the user (or more likely the developer) to ask for a bootstrap
  39 # of the package.
  40 #
  41 # Two issues that must be kept in mind in the implementation below:
  42 #
  43 #  [1] "make bootstrap" can be invoked before 'configure' is run (and in
  44 #      fact, even before it is created, if we are bootstrapping from a
  45 #      freshly-cloned checkout).
  46 #
  47 #  [2] When re-bootstrapping an already configured tree, we must ensure
  48 #      that the automatic remake rules for Makefile and company do not
  49 #      kick in, because the tree might be in an inconsistent state (e.g.,
  50 #      we have just switched from 'maint' to 'master', and have the built
  51 #      'automake' script left from 'maint', but the files 'lib/am/*.am'
  52 #      are from 'master': if 'automake' gets run and used those files --
  53 #      boom!).
  54
  55 ifdef config-status # Bootstrap from an already-configured tree.
  56   # We need the definition of $(srcdir) in the 'bootstrap' rule
  57   # below.
  58   srcdir := $(shell echo @srcdir@ | $(config-status) --file=-)
  59   ifndef srcdir
  60     $(error Could not obtain $$(srcdir) from $(config-status))
  61   endif
  62   # Also, if we are re-bootstrapping an already-configured tree, we
  63   # want to re-configure it with the same pre-existing configuration.
  64   old-configure-flags := $(shell $(config-status) --config)
  65 else # Assume we are bootstrapping from an unconfigured srcdir.
  66   srcdir := .
  67   old-configure-flags :=
  68 endif
  69
  70 configure-flags := $(old-configure-flags) $(BOOTSTRAP_CONFIGURE_FLAGS)
  71
  72 .PHONY: bootstrap
  73 bootstrap:
  74         cd $(srcdir) && $(SHELL) ./bootstrap.sh
  75         $(srcdir)/configure $(configure-flags)
  76         $(MAKE) clean
  77         $(MAKE) check TESTS=t/get-sysconf
  78
  79 # Ensure that all the specified targets but 'bootstrap' (if any) are
  80 # run with a properly re-bootstrapped tree.
  81 ifdef other-targets
  82 $(other-targets): restart
  83 .PHONY: $(other-targets) restart
  84 restart: bootstrap; $(MAKE) $(AM_MAKEFLAGS) $(other-targets)
  85 endif
  86
  87 endif # ! bootstrap in $(MAKECMDGOALS)