GNUmakefile

   1 # Having a separate GNUmakefile lets me `include' the dynamically
   2 # generated rules created via cfg.mk (package-local configuration)
   3 # as well as maint.mk (generic maintainer rules).
   4 # This makefile is used only if you run GNU Make.
   5 # It is necessary if you want to build targets usually of interest
   6 # only to the maintainer.
   7
   8 # Copyright (C) 2001, 2003, 2006-2011 Free Software Foundation, Inc.
   9
  10 # This program is free software: you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation, either version 3 of the License, or
  13 # (at your option) any later version.
  14
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 # Systems where /bin/sh is not the default shell need this.  The $(shell)
  24 # command below won't work with e.g. stock DOS/Windows shells.
  25 ifeq ($(wildcard /bin/s[h]),/bin/sh)
  26 SHELL = /bin/sh
  27 else
  28 # will be used only with the next shell-test line, then overwritten
  29 # by a configured-in value
  30 SHELL = sh
  31 endif
  32
  33 # If the user runs GNU make but has not yet run ./configure,
  34 # give them a diagnostic.
  35 _have-Makefile := $(shell test -f Makefile && echo yes)
  36 ifeq ($(_have-Makefile),yes)
  37
  38 # Make tar archive easier to reproduce.
  39 export TAR_OPTIONS = --owner=0 --group=0 --numeric-owner
  40
  41 # Allow the user to add to this in the Makefile.
  42 ALL_RECURSIVE_TARGETS =
  43
  44 include Makefile
  45
  46 # Some projects override e.g., _autoreconf here.
  47 -include $(srcdir)/cfg.mk
  48 include $(srcdir)/maint.mk
  49
  50 # Allow cfg.mk to override these.
  51 _build-aux ?= build-aux
  52 _autoreconf ?= autoreconf -v
  53
  54 # Ensure that $(VERSION) is up to date for dist-related targets, but not
  55 # for others: rerunning autoreconf and recompiling everything isn't cheap.
  56 _have-git-version-gen := \
  57   $(shell test -f $(srcdir)/$(_build-aux)/git-version-gen && echo yes)
  58 ifeq ($(_have-git-version-gen)0,yes$(MAKELEVEL))
  59   _is-dist-target ?= $(filter-out %clean, \
  60     $(filter maintainer-% dist% alpha beta stable,$(MAKECMDGOALS)))
  61   _is-install-target ?= $(filter-out %check, $(filter install%,$(MAKECMDGOALS)))
  62   ifneq (,$(_is-dist-target)$(_is-install-target))
  63     _curr-ver := $(shell cd $(srcdir)                           \
  64                    && $(_build-aux)/git-version-gen             \
  65                          .tarball-version                       \
  66                          $(git-version-gen-tag-sed-script))
  67     ifneq ($(_curr-ver),$(VERSION))
  68       ifeq ($(_curr-ver),UNKNOWN)
  69         $(info WARNING: unable to verify if $(VERSION) is the correct version)
  70       else
  71         ifneq (,$(_is-install-target))
  72           # GNU Coding Standards state that 'make install' should not cause
  73           # recompilation after 'make all'.  But as long as changing the version
  74           # string alters config.h, the cost of having 'make all' always have an
  75           # up-to-date version is prohibitive.  So, as a compromise, we merely
  76           # warn when installing a version string that is out of date; the user
  77           # should run 'autoreconf' (or something like 'make distcheck') to
  78           # fix the version, 'make all' to propagate it, then 'make install'.
  79           $(info WARNING: version string $(VERSION) is out of date;)
  80           $(info run '$(MAKE) _version' to fix it)
  81         else
  82           $(info INFO: running autoreconf for new version string: $(_curr-ver))
  83 GNUmakefile: _version
  84         touch GNUmakefile
  85         endif
  86       endif
  87     endif
  88   endif
  89 endif
  90
  91 .PHONY: _version
  92 _version:
  93         cd $(srcdir) && rm -rf autom4te.cache .version && $(_autoreconf)
  94         $(MAKE) $(AM_MAKEFLAGS) Makefile
  95
  96 else
  97
  98 .DEFAULT_GOAL := abort-due-to-no-makefile
  99 srcdir = .
 100
 101 # The package can override .DEFAULT_GOAL to run actions like autoreconf.
 102 -include ./cfg.mk
 103 include ./maint.mk
 104
 105 ifeq ($(.DEFAULT_GOAL),abort-due-to-no-makefile)
 106 $(MAKECMDGOALS): abort-due-to-no-makefile
 107 endif
 108
 109 abort-due-to-no-makefile:
 110         @echo There seems to be no Makefile in this directory.   1>&2
 111         @echo "You must run ./configure before running \`make'." 1>&2
 112         @exit 1
 113
 114 endif
 115
 116 # Tell version 3.79 and up of GNU make to not build goals in this
 117 # directory in parallel, in case someone tries to build multiple
 118 # targets, and one of them can cause a recursive target to be invoked.
 119
 120 # Only set this if Automake doesn't provide it.
 121 AM_RECURSIVE_TARGETS ?= $(RECURSIVE_TARGETS:-recursive=) \
 122   $(RECURSIVE_CLEAN_TARGETS:-recursive=) \
 123   dist distcheck tags ctags
 124
 125 ALL_RECURSIVE_TARGETS += $(AM_RECURSIVE_TARGETS)
 126
 127 ifneq ($(word 2, $(MAKECMDGOALS)), )
 128 ifneq ($(filter $(ALL_RECURSIVE_TARGETS), $(MAKECMDGOALS)), )
 129 .NOTPARALLEL:
 130 endif
 131 endif