root/openpgpsdk/trunk/configure

#!/usr/bin/perl -w

use strict;

use Carp;
use File::Temp;
use File::Spec;
use POSIX qw(:errno_h);
use IO::File;

$|=1;

our $Log;
our $LogFile='/dev/null';

sub trace {
    return if !$Log;

    $Log->seek(0,2);
    print $Log join '',@_;
}

our %Subst=(
            CRYPTO_LIBS => '-lcrypto',
            ZLIB => '-lz',
            INCLUDES => '',
            CFLAGS => '',
           );

my %Args=(
          '--help' => \&usage,
          '--use-dmalloc' => sub {
              $Subst{DM_FLAGS}='-I/usr/local/include -DDMALLOC';
              $Subst{DM_LIB}='/usr/local/lib/libdmalloc.a';
          },
          '--with-openssl=' => sub {
              my $loc=shift;
              $Subst{INCLUDES}.=" -I $loc/include";
              $Subst{CRYPTO_LIBS}="$loc/libcrypto.a";
          },
          '--with-zlib=' => sub {
              my $loc=shift;
              $Subst{INCLUDES}.=" -I $loc";
              $Subst{ZLIB}="$loc/libz.a";
          },
          '--log=' => sub {
              $LogFile=shift;
              $Log=new IO::File(">$LogFile");
              $Log->autoflush(1);
          },
          '--64' => sub {
              $Subst{CFLAGS}.=' -m64';
          }
         );

my %Functions=(
               'socket' => { headers => ['sys/types.h','sys/socket.h'],
                             call => 'socket(0,0,0)',
                             libs => [[],['socket','nsl']] },
               );

my @Headers=qw(alloca.h);
my @Types=qw(time_t);
my @RHeaders=qw(openssl/bn.h zlib.h);

our %Knowledge=(
                cc => sub { return chooseBinary('gcc','cc')
                             || croak 'Can\'t find C compiler'; },
                path => sub { return [split /:/,$ENV{PATH}]; },
                time_t => sub { return typeInfo('time_t','time.h'); }
              );

while(my $arg=shift) {
    my $arg2;
    if($arg =~ /^(.+=)(.+)$/) {
        $arg=$1;
        $arg2=$2;
    }
    my $code=$Args{$arg};
    croak "Don't understand: $arg" if !defined $code;
    &$code($arg2);
}

#my $os=`uname -s`;

checkHeaders(\@RHeaders);

$Subst{'CC'}=getKnowledge('cc');

findHeaders(\@Headers);
investigateTypes(\@Types);
my $libs=findLibraries(\%Functions);
$Subst{'LIBS'}=join(' ',map { "-l$_" } @$libs);
#exit;

fixSubst();

create('src/.depend');
create('examples/.depend');

fileSubst('src/Makefile','#','');
fileSubst('examples/Makefile','#','');
fileSubst('include/configure.h','/*','*/');

print "make clean\n";
system 'make clean' || exit;
print "make force_depend\n";
if(system('make force_depend') != 0) {
    print STDERR "Configuration failed\n";
    exit 1;
}

sub subst {
    my $line=shift;

    while(my($k,$v)=each %Subst) {
        $line =~ s/\%$k\%/$v/g;
    }
    $line =~ s/\%.+?\%//g;
    return $line;
}

sub chooseBinary {
    my $path=getKnowledge('path');
    while(my $bin=shift) {
        foreach my $p (@$path) {
            return $bin if -x "$p/$bin";
        }
    }
    return 'false';
}

sub getKnowledge {
    my $thing=shift;

    croak "Asked for nonexistent knowledge $thing"
      if !exists $Knowledge{$thing};

    if(ref $Knowledge{$thing} eq 'CODE') {
        print "Finding $thing\n";
        $Knowledge{$thing}=&{$Knowledge{$thing}}();
    }
    return $Knowledge{$thing};
}

sub usage {
    foreach my $k (keys %Args) {
        print "$k\n";
    }
    exit;
}

sub findHeaders {
    my $list=shift;

    foreach my $h (@$list) {
        my $n='HAVE_'.uc $h;
        $n =~ s/[\.\/]/_/;
        print "Looking for header $h ($n)\n";
        if(-e "/usr/include/$h") {
            $Subst{$n}="#define $n 0";
        } else {
            $Subst{$n}="#undef $n";
        }
    }
}

sub fileSubst {
    my $file=shift;
    my $cs=shift;
    my $ce=shift;

    open(T,"$file.template") || croak "Can't open $file.template: $!";
    unlink $file;
    open(M,">$file") || croak "Can't create $file: $!";

    print M "$cs generated by configure from $file.template. Don't edit. $ce\n\n";

    while(my $line=<T>) {
        print M subst($line);
    }

    close M;
    close T;

    chmod 0444,"$file";
}

sub fixSubst {
    foreach my $k (keys %Subst) {
        $Subst{$k} =~ s/~/$ENV{HOME}/g;
    }
}

sub create {
    my $file=shift;

    print "Creating $file\n";
    open(D,">$file") || croak "Can't create $file: $!";
    close D;
}

sub build {
    my $code=shift;
    my $link=shift;

    my $cc=getKnowledge('cc');
    my $fh=new File::Temp(SUFFIX => '.c');

    my($v,$d,$f)=File::Spec->splitpath($fh->filename());

    my $cur=File::Spec->rel2abs(File::Spec->curdir());
    chdir($d) || croak "chdir($d): $!";

    print $fh $code;
    $fh->close();

    my $cflag='';
    $cflag='-c' if !defined $link;
    my $cmd="$cc $Subst{CFLAGS} $Subst{INCLUDES} -Wall -Werror $cflag ".$f;
    $cmd.=" $link" if defined $link;
    trace("$cmd\n--code--\n$code--------\n");
    my $ret=system("$cmd >> $LogFile 2>&1");

    my $obj=$fh->filename();
    $obj =~ s/\.c$/.o/;
    unlink($obj) || $! == ENOENT || croak "unlink($obj): $!";
    unlink('a.out') || $! == ENOENT || croak "unlink(a.out): $!";

    chdir($cur) || croak "chdir($cur): $!";

    return $ret == 0;
}

sub typeInfo {
    my $type=shift;
    my $header=shift;

    my %info;

    print "Getting info about $type.\n";

    foreach my $fmt (qw(%d %ld)) {
        my $code="#include <$header>\n";
        $code .= "#include <stdio.h>\n";
        $code .= "void f(void) { static $type t; printf(\"$fmt\",t); }\n";
        if(build($code)) {
            $info{fmt}=$fmt;
            print "  $type printf format is $fmt\n";
        }
    }
    croak "Can't determine print format for $type" if !defined $info{fmt};

    return \%info;
}

sub investigateTypes {
    my $types=shift;

    foreach my $type (@$types) {
        my $info=getKnowledge($type);
        $Subst{uc($type)."_FMT"}="\"$info->{fmt}\"";
    }
}

sub checkHeaders {
    my $headers=shift;

    foreach my $h (@$headers) {
        print "Check required header $h\n";
        build("#include <$h>\n") || croak "Can't find required header $h";
    }
}

sub findLibraries {
    my $funcs=shift;

    my @libs;
  func:
    foreach my $func (keys %$funcs) {
        print "Checking libraries for $func()\n";
        my $code=join("\n",map { "#include <$_>" }
                      @{$funcs->{$func}->{headers}});
        $code.="\nint main() { $funcs->{$func}->{call}; return 0; }\n";
        foreach my $lgroup (@{$funcs->{$func}->{libs}}) {
            print "  trying ",@$lgroup ? join(', ',@$lgroup) : 'no libraries';
            if(build($code,join(' ',map { "-l$_" } @$lgroup))) {
                push @libs,@$lgroup;
                print " ... OK\n";
                next func;
            }
            print " ... no\n";
        }
    }
    return \@libs;
}