#!/usr/bin/env perl

# Note: this script must not be used to build MPFR due to the
# dependency on perl, but this is OK for "make dist".

# Copyright 2010-2018 Free Software Foundation, Inc.
# This script is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

use strict;
use Cwd;

if (! -d 'src')
  {
    getcwd() =~ m,/tools$,
      or die "Execute $0 from the MPFR source directory\n";
    chdir '..' or die "$!\n$0: can't change cwd\n";
  }

open VERSION, '<', 'VERSION'
  or die "$!\n$0: can't open VERSION file\n";
my $version = do { local $/; <VERSION> };
close VERSION or die "$!\n$0: can't close VERSION file\n";

my ($mv,$pl,$suf) = $version =~ /^(\d+\.\d+)\.(\d+)(-\S+)?/
  or die "$0: bad VERSION format\n";

open MF, '<', 'src/Makefile.am'
  or die "$!\n$0: can't open Makefile.am file\n";
my $cur = 0;
my $age = -1;
my $vinfo;  # expected -version-info value
while (<MF>)
  {
    last if $cur && ! /^\s*(#.*)$/;
    /^#\s+(\d+\.\d+)\.x\s+(\d+):x:(\d+)/ or next;
    $2 == ++$cur or die "$0: bad CURRENT ($2)";
    $3 == 0 || $3 == $age + 1 or die "$0: bad AGE ($3)";
    $age = $3;
    $mv eq $1 and $vinfo = "$cur:$pl:$age";
  }
/^libmpfr_la_LDFLAGS\s+=.*\s-version-info\s+(\d+:\d+:\d+)\s/
  or die "$0: missing correct libmpfr_la_LDFLAGS line";
close MF or die "$!\n$0: can't close Makefile.am file\n";
$suf eq '-dev' || $vinfo eq $1
  or die "$0: bad -version-info value ($1 instead of $vinfo)\n";

open CONFIGURE, '<', 'configure.ac'
  or die "$!\n$0: can't open configure.ac file\n";
my $dllversion = $cur - $age;
my $dllvinconf;
while (<CONFIGURE>)
  {
    /^\s*LIBMPFR_LDFLAGS\s*=.*-Wl,--output-def,\.libs\/libmpfr-(\d+)\.dll\.def/
      and $dllvinconf = $1, last;
  }
close CONFIGURE or die "$!\n$0: can't close configure.ac file\n";
defined $dllvinconf or die "$0: missing correct LIBMPFR_LDFLAGS line\n";
$suf eq '-dev' || $dllversion eq $dllvinconf
  or die "$0: bad libmpfr.dll-version value (libmpfr-$dllvinconf.dll.def".
  " instead of libmpfr-$dllversion.dll.def)\n";