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#!perl -w
use strict;
use Config qw(%Config);
use ExtUtils::MakeMaker;
my @extra;
@extra = (DEFINE => "-DU32_ALIGNMENT_REQUIRED") unless free_u32_alignment();
if ($^O eq 'VMS') {
if (defined($Config{ccname})) {
if (grep(/VMS_VAX/, @INC) && ($Config{ccname} eq 'DEC')) {
# VAX compiler optimizer even as late as v6.4 gets stuck
push(@extra, OPTIMIZE => "/Optimize=(NODISJOINT)");
}
}
}
push(@extra, 'INSTALLDIRS' => 'perl') if $] >= 5.008;
push @extra, 'LICENSE' => 'perl' if eval($ExtUtils::MakeMaker::VERSION) >= "6.30";
WriteMakefile(
'NAME' => 'Digest::MD5',
'VERSION_FROM' => 'MD5.pm',
'PREREQ_PM' => { 'File::Spec' => 0,
'Digest::base' => '1.00',
'XSLoader' => 0,
},
@extra,
'dist' => { COMPRESS => 'gzip -9f', SUFFIX => 'gz', },
);
sub free_u32_alignment
{
$|=1;
if (exists $Config{d_u32align}) {
print "Perl's config says that U32 access must ";
print "not " unless $Config{d_u32align};
print "be aligned.\n";
return !$Config{d_u32align};
}
if ($^O eq 'VMS' || $^O eq 'MSWin32') {
print "Assumes that $^O implies free alignment for U32 access.\n";
return 1;
}
if ($^O eq 'hpux' && $Config{osvers} < 11.0) {
print "Will not test for free alignment on older HP-UX.\n";
return 0;
}
print "Testing alignment requirements for U32... ";
open(ALIGN_TEST, ">u32align.c") or die "$!";
print ALIGN_TEST <<'EOT'; close(ALIGN_TEST);
/*--------------------------------------------------------------*/
/* This program allocates a buffer of U8 (char) and then tries */
/* to access it through a U32 pointer at every offset. The */
/* program is expected to die with a bus error/seg fault for */
/* machines that do not support unaligned integer read/write */
/*--------------------------------------------------------------*/
#include <stdio.h>
#include "EXTERN.h"
#include "perl.h"
#ifdef printf
#undef printf
#endif
int main(int argc, char** argv, char** env)
{
#if BYTEORDER == 0x1234 || BYTEORDER == 0x4321
U8 buf[] = "\0\0\0\1\0\0\0\0";
U32 *up;
int i;
if (sizeof(U32) != 4) {
printf("sizeof(U32) is not 4, but %d\n", sizeof(U32));
exit(1);
}
fflush(stdout);
for (i = 0; i < 4; i++) {
up = (U32*)(buf + i);
if (! ((*up == 1 << (8*i)) || /* big-endian */
(*up == 1 << (8*(3-i))) /* little-endian */
)
)
{
printf("read failed (%x)\n", *up);
exit(2);
}
}
/* write test */
for (i = 0; i < 4; i++) {
up = (U32*)(buf + i);
*up = 0xBeef;
if (*up != 0xBeef) {
printf("write failed (%x)\n", *up);
exit(3);
}
}
printf("no restrictions\n");
exit(0);
#else
printf("unusual byteorder, playing safe\n");
exit(1);
#endif
return 0;
}
/*--------------------------------------------------------------*/
EOT
my $cc_cmd = "$Config{cc} $Config{ccflags} -I$Config{archlibexp}/CORE";
my $exe = "u32align$Config{exe_ext}";
$cc_cmd .= " -o $exe";
my $rc;
$rc = system("$cc_cmd $Config{ldflags} u32align.c $Config{libs}");
if ($rc) {
print "Can't compile test program. Will ensure alignment to play safe.\n\n";
unlink("u32align.c", $exe, "u32align$Config{obj_ext}");
return 0;
}
$rc = system("./$exe");
unlink("u32align.c", $exe, "u32align$Config{obj_ext}");
return 1 unless $rc;
if ($rc > 0x80) {
(my $cp = $rc) >>= 8;
print "Test program exit status was $cp\n";
}
if ($rc & 0x80) {
$rc &= ~0x80;
unlink("core") && print "Core dump deleted\n";
}
print "signal $rc\n" if $rc && $rc < 0x80;
return 0;
}
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