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# Build the VERY BASIC reproduction pipeline dependencies (programs and
# libraries).
#
# ------------------------------------------------------------------------
#                      !!!!! IMPORTANT NOTES !!!!!
#
# This Makefile will be run by the initial `./configure' script. It is not
# included into the reproduction pipe after that.
#
# This Makefile builds very low-level and basic tools like GNU Bash and GNU
# Make. Therefore this is the only Makefile in the reproduction pipeline
# where you MUST NOT assume that modern GNU Bash or GNU Make are used.
#
# This Makefile is a very simplified version of `dependencies.mk' in the
# same directory. See there for more comments.
#
# ------------------------------------------------------------------------
#
# Original author:
#     Mohammad Akhlaghi <mohammad@akhlaghi.org>
# Contributing author(s):
#     Your name <your@email.address>
# Copyright (C) 2018, Your Name.
#
# This Makefile is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This Makefile is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.
#
# A copy of the GNU General Public License is available at
# <http://www.gnu.org/licenses/>.


# Top level environment
include reproduce/config/pipeline/LOCAL.mk
include reproduce/config/pipeline/dependency-versions.mk

ddir  = $(BDIR)/dependencies
tdir  = $(BDIR)/dependencies/tarballs
idir  = $(BDIR)/dependencies/installed
ibdir = $(BDIR)/dependencies/installed/bin
ildir = $(BDIR)/dependencies/installed/lib

top-level-programs = bash make
all: $(foreach p, $(top-level-programs), $(ibdir)/$(p))





# Tarballs
# --------
#
# Prepare tarballs. Difference with that in `dependencies.mk': `.ONESHELL'
# is not recognized by some versions of Make (even older GNU Makes). So
# we'll have to make sure the recipe doesn't break into multiple shell
# calls (so we can preserve the variables).
tarballs = $(foreach t, bash-$(bash-version).tar.gz                       \
	                make-$(make-version).tar.gz                       \
                      , $(tdir)/$(t) )
$(tarballs): $(tdir)/%:
	if [ -f $(DEPENDENCIES-DIR)/$* ]; then                            \
	  cp $(DEPENDENCIES-DIR)/$* $@;                                   \
	else                                                              \
	  n=$$(echo $* | sed -e's/[0-9\-]/ /g' -e's/\./ /g'               \
	               | awk '{print $$1}' );                             \
	                                                                  \
	  mergenames=1;                                                   \
	  if   [ $$n = bash        ]; then w=http://ftp.gnu.org/gnu/bash; \
	  elif [ $$n = make        ]; then w=http://akhlaghi.org/src;     \
	  else                                                            \
	    echo; echo; echo;                                             \
	    echo "'$$n' not recognized as a dependency name to download." \
	    echo; echo; echo;                                             \
	    exit 1;                                                       \
	  fi;                                                             \
	                                                                  \
	  if [ $$mergenames = 1 ]; then  tarballurl=$$w/"$*";             \
	  else                           tarballurl=$$w;                  \
	  fi;                                                             \
	  echo "Downloading $$tarballurl";                                \
	  $(DOWNLOADER) $@ $$tarballurl;                                  \
	fi





# Build system rules
# ------------------
gbuild = cd $(ddir); rm -rf $(2); tar xf $(tdir)/$(1); cd $(2);      \
         if [ $(3)x = staticx ]; then                                \
         opts="CFLAGS=--static --disable-shared";                    \
         fi;                                                         \
         ./configure $$opts $(4) --prefix=$(idir); make $(5);        \
         check="$(6)"; if [ x"$$check" != x ]; then $$check; fi;     \
         make install; cd ..; rm -rf $(2)





# GNU Bash
# --------
#
# Everything is standard and we can make it statically.
$(ibdir)/bash: $(tdir)/bash-$(bash-version).tar.gz
	$(call gbuild,$(subst $(tdir),,$<), bash-$(bash-version), static)





# GNU Make
# --------
#
# Unfortunately GNU Make needs dynamic linking in two instances: when
# loading objects (dynamically linked libraries), or when using the
# `getpwnam' function (for tilde expansion). The first can be disabled with
# `--disable-load', but unfortunately I don't know any way to fix the
# second. So, we'll have to build it dynamically for now.
$(ibdir)/make: $(tdir)/make-$(make-version).tar.gz
	$(call gbuild,$(subst $(tdir),,$<), make-$(make-version))