+#./perl -w
#
# Create the export list for perl.
#
# and by AIX for creating libperl.a when -Dusershrplib is in effect,
# and by MacOS Classic.
#
-# reads global.sym, pp.sym, perlvars.h, intrpvar.h, thrdvar.h, config.h
+# reads global.sym, pp.sym, perlvars.h, intrpvar.h, config.h
# On OS/2 reads miniperl.map and the previous version of perl5.def as well
-my $PLATFORM;
-my $CCTYPE;
+BEGIN { unshift @INC, "lib" }
+use strict;
+
+use vars qw($PLATFORM $CCTYPE $FILETYPE $CONFIG_ARGS $ARCHNAME $PATCHLEVEL);
+
+my (%define, %ordinal);
while (@ARGV) {
my $flag = shift;
defined $PLATFORM || die "PLATFORM undefined, must be one of: @PLATFORM\n";
exists $PLATFORM{$PLATFORM} || die "PLATFORM must be one of: @PLATFORM\n";
+if ($PLATFORM eq 'win32' or $PLATFORM eq 'wince' or $PLATFORM eq "aix") {
+ # Add the compile-time options that miniperl was built with to %define.
+ # On Win32 these are not the same options as perl itself will be built
+ # with since miniperl is built with a canned config (one of the win32/
+ # config_H.*) and none of the BUILDOPT's that are set in the makefiles,
+ # but they do include some #define's that are hard-coded in various
+ # source files and header files and don't include any BUILDOPT's that
+ # the user might have chosen to disable because the canned configs are
+ # minimal configs that don't include any of those options.
+ my $opts = ($PLATFORM eq 'wince' ? '-MCross' : ''); # for wince need Cross.pm to get Config.pm
+ my $config = `$^X $opts -Ilib -V`;
+ my($options) = $config =~ /^ Compile-time options: (.*?)\n^ \S/ms;
+ $options =~ s/\s+/ /g;
+ print STDERR "Options: ($options)\n";
+ foreach (split /\s+/, $options) {
+ $define{$_} = 1;
+ }
+}
+
my %exportperlmalloc =
(
Perl_malloc => "malloc",
my $config_sh = "config.sh";
my $config_h = "config.h";
-my $thrdvar_h = "thrdvar.h";
my $intrpvar_h = "intrpvar.h";
my $perlvars_h = "perlvars.h";
my $global_sym = "global.sym";
my $pp_sym = "pp.sym";
my $globvar_sym = "globvar.sym";
my $perlio_sym = "perlio.sym";
+my $static_ext = "";
if ($PLATFORM eq 'aix') {
# Nothing for now.
}
elsif ($PLATFORM =~ /^win(?:32|ce)$/ || $PLATFORM eq 'netware') {
$CCTYPE = "MSVC" unless defined $CCTYPE;
- foreach ($thrdvar_h, $intrpvar_h, $perlvars_h, $global_sym,
- $pp_sym, $globvar_sym, $perlio_sym) {
+ foreach ($intrpvar_h, $perlvars_h, $global_sym,
+ $pp_sym, $globvar_sym, $perlio_sym) {
s!^!..\\!;
}
}
elsif ($PLATFORM eq 'MacOS') {
- foreach ($thrdvar_h, $intrpvar_h, $perlvars_h, $global_sym,
- $pp_sym, $globvar_sym, $perlio_sym) {
+ foreach ($intrpvar_h, $perlvars_h, $global_sym,
+ $pp_sym, $globvar_sym, $perlio_sym) {
s!^!::!;
}
}
$_ = $1;
$define{$1} = 1 while /-D(\w+)/g;
}
+ if (/^(d_(?:mmap|sigaction))='(.+)'$/) {
+ $define{$1} = $2;
+ }
if ($PLATFORM eq 'os2') {
$CONFIG_ARGS = $1 if /^config_args='(.+)'$/;
$ARCHNAME = $1 if /^archname='(.+)'$/;
}
close(CFG);
}
+if ($PLATFORM eq 'win32' || $PLATFORM eq 'wince') {
+ open(CFG,"<..\\$config_sh") || die "Cannot open ..\\$config_sh: $!\n";
+ if ((join '', <CFG>) =~ /^static_ext='(.*)'$/m) {
+ $static_ext = $1;
+ }
+ close(CFG);
+}
open(CFG,$config_h) || die "Cannot open $config_h: $!\n";
while (<CFG>) {
my $sym_ord = 0;
+print STDERR "Defines: (" . join(' ', sort keys %define) . ")\n";
+
if ($PLATFORM =~ /^win(?:32|ce)$/) {
- warn join(' ',keys %define)."\n";
- ($dll = ($define{PERL_DLL} || "perl59")) =~ s/\.dll$//i;
+ (my $dll = ($define{PERL_DLL} || "perl59")) =~ s/\.dll$//i;
print "LIBRARY $dll\n";
- print "DESCRIPTION 'Perl interpreter'\n";
+ # The DESCRIPTION module definition file statement is not supported
+ # by VC7 onwards.
+ if ($CCTYPE !~ /^MSVC7/ && $CCTYPE !~ /^MSVC8/) {
+ print "DESCRIPTION 'Perl interpreter'\n";
+ }
print "EXPORTS\n";
if ($define{PERL_IMPLICIT_SYS}) {
output_symbol("perl_get_host_info");
}
$sym_ord < $_ and $sym_ord = $_ for values %ordinal; # Take the max
}
- ($v = $]) =~ s/(\d\.\d\d\d)(\d\d)$/$1_$2/;
+ (my $v = $]) =~ s/(\d\.\d\d\d)(\d\d)$/$1_$2/;
$v .= '-thread' if $ARCHNAME =~ /-thread/;
- ($dll = $define{PERL_DLL}) =~ s/\.dll$//i;
+ (my $dll = $define{PERL_DLL}) =~ s/\.dll$//i;
$v .= "\@$PATCHLEVEL" if $PATCHLEVEL;
- $d = "DESCRIPTION '\@#perl5-porters\@perl.org:$v#\@ Perl interpreter, configured as $CONFIG_ARGS'";
+ my $d = "DESCRIPTION '\@#perl5-porters\@perl.org:$v#\@ Perl interpreter, configured as $CONFIG_ARGS'";
$d = substr($d, 0, 249) . "...'" if length $d > 253;
print <<"---EOP---";
LIBRARY '$dll' INITINSTANCE TERMINSTANCE
---EOP---
}
elsif ($PLATFORM eq 'aix') {
- $OSVER = `uname -v`;
+ my $OSVER = `uname -v`;
chop $OSVER;
- $OSREL = `uname -r`;
+ my $OSREL = `uname -r`;
chop $OSREL;
if ($OSVER > 4 || ($OSVER == 4 && $OSREL >= 3)) {
print "#! ..\n";
PL_linestart
PL_modcount
PL_pending_ident
- PL_sortcxix
PL_sublex_info
PL_timesbuf
main
Perl_getenv_len
Perl_my_pclose
Perl_my_popen
+ Perl_my_sprintf
)];
}
else {
PL_linestart
PL_modcount
PL_pending_ident
- PL_sortcxix
PL_sublex_info
PL_timesbuf
PL_collation_ix
Perl_sv_collxfrm
setgid
setuid
- win32_async_check
win32_free_childdir
win32_free_childenv
win32_get_childdir
Perl_getenv_len
Perl_my_pclose
Perl_my_popen
+ Perl_my_sprintf
)];
}
elsif ($PLATFORM eq 'aix') {
Perl_sys_intern_clear
Perl_sys_intern_dup
Perl_sys_intern_init
+ Perl_my_sprintf
PL_cryptseen
PL_opsave
PL_statusvalue_vms
dlsym
dlerror
dlclose
+ dup2
+ dup
my_tmpfile
my_tmpnam
my_flock
my_getpwent
my_setpwent
my_endpwent
+ fork_with_resources
+ croak_with_os2error
setgrent
endgrent
getgrent
nthreads_cond
os2_cond_wait
os2_stat
+ os2_execname
+ async_mssleep
+ msCounter
+ InfoTable
pthread_join
pthread_create
pthread_detach
PL_linestart
PL_modcount
PL_pending_ident
- PL_sortcxix
PL_sublex_info
PL_timesbuf
main
Perl_debprofdump
Perl_debstack
Perl_debstackptrs
+ Perl_pad_sv
Perl_sv_peek
+ Perl_hv_assert
PL_block_type
PL_watchaddr
PL_watchok
+ PL_watch_pvx
+ )];
+}
+
+if ($define{'PERL_IMPLICIT_CONTEXT'}) {
+ skip_symbols [qw(
+ PL_sig_sv
)];
}
)];
}
-unless ($define{'PERL_COPY_ON_WRITE'}) {
+unless ($define{'PERL_OLD_COPY_ON_WRITE'}) {
skip_symbols [qw(
Perl_sv_setsv_cow
- Perl_sv_release_IVX
)];
}
-unless ($define{'PERL_FLEXIBLE_EXCEPTIONS'}) {
- skip_symbols [qw(
- PL_protect
- Perl_default_protect
- Perl_vdefault_protect
- )];
-}
-
unless ($define{'USE_REENTRANT_API'}) {
skip_symbols [qw(
PL_reentrant_buffer
Perl_get_mstats
Perl_strdup
Perl_putenv
+ MallocCfg_ptr
+ MallocCfgP_ptr
)];
if ($define{'USE_ITHREADS'}) {
emit_symbols [qw(
Perl_dump_mstats
Perl_get_mstats
Perl_malloced_size
+ MallocCfg_ptr
+ MallocCfgP_ptr
)];
}
+if ($define{'PERL_USE_SAFE_PUTENV'}) {
+ skip_symbols [qw(
+ PL_use_safe_putenv
+ )];
+}
+
unless ($define{'USE_ITHREADS'}) {
skip_symbols [qw(
PL_thr_key
unless ($define{'USE_ITHREADS'}) {
skip_symbols [qw(
- PL_ptr_table
PL_op_mutex
PL_regex_pad
PL_regex_padav
PL_sharedsv_space
PL_sharedsv_space_mutex
PL_dollarzero_mutex
+ PL_hints_mutex
+ PL_perlio_mutex
+ PL_regdupe
+ Perl_parser_dup
Perl_dirp_dup
Perl_cx_dup
Perl_si_dup
Perl_gp_dup
Perl_he_dup
Perl_mg_dup
+ Perl_mro_meta_dup
Perl_re_dup
Perl_sv_dup
+ Perl_rvpv_dup
+ Perl_hek_dup
Perl_sys_intern_dup
- Perl_ptr_table_clear
- Perl_ptr_table_fetch
- Perl_ptr_table_free
- Perl_ptr_table_new
- Perl_ptr_table_clear
- Perl_ptr_table_free
- Perl_ptr_table_split
- Perl_ptr_table_store
perl_clone
perl_clone_using
Perl_sharedsv_find
Perl_sharedsv_thrcnt_dec
Perl_sharedsv_thrcnt_inc
Perl_sharedsv_unlock
+ Perl_stashpv_hvname_match
+ Perl_regdupe_internal
+ Perl_newPADOP
)];
}
unless ($define{'PERL_IMPLICIT_CONTEXT'}) {
skip_symbols [qw(
+ PL_my_ctx_mutex
+ PL_my_cxt_index
+ PL_my_cxt_list
+ PL_my_cxt_size
+ PL_my_cxt_keys
Perl_croak_nocontext
Perl_die_nocontext
Perl_deb_nocontext
Perl_sv_setpvf_nocontext
Perl_sv_catpvf_mg_nocontext
Perl_sv_setpvf_mg_nocontext
+ Perl_my_cxt_init
+ Perl_my_cxt_index
)];
}
PL_OpPtr
PL_OpSlab
PL_OpSpace
+ Perl_Slab_Alloc
+ Perl_Slab_Free
)];
}
+unless ($define{'PERL_DEBUG_READONLY_OPS'}) {
+ skip_symbols [qw(
+ PL_slab_count
+ PL_slabs
+ )];
+}
+
unless ($define{'THREADS_HAVE_PIDS'}) {
skip_symbols [qw(PL_ppid)];
}
+unless ($define{'PERL_NEED_APPCTX'}) {
+ skip_symbols [qw(
+ PL_appctx
+ )];
+}
+
+unless ($define{'PERL_NEED_TIMESBASE'}) {
+ skip_symbols [qw(
+ PL_timesbase
+ )];
+}
+
+unless ($define{'DEBUG_LEAKING_SCALARS_FORK_DUMP'}) {
+ skip_symbols [qw(
+ PL_dumper_fd
+ )];
+}
+unless ($define{'PERL_DONT_CREATE_GVSV'}) {
+ skip_symbols [qw(
+ Perl_gv_SVadd
+ )];
+}
+if ($define{'SPRINTF_RETURNS_STRLEN'}) {
+ skip_symbols [qw(
+ Perl_my_sprintf
+ )];
+}
+unless ($define{'PERL_USES_PL_PIDSTATUS'}) {
+ skip_symbols [qw(
+ Perl_pidgone
+ PL_pidstatus
+ )];
+}
+
+unless ($define{'PERL_TRACK_MEMPOOL'}) {
+ skip_symbols [qw(
+ PL_memory_debug_header
+ )];
+}
+
+if ($define{'PERL_MAD'}) {
+ skip_symbols [qw(
+ PL_nextval
+ PL_nexttype
+ )];
+} else {
+ skip_symbols [qw(
+ PL_madskills
+ PL_xmlfp
+ PL_lasttoke
+ PL_realtokenstart
+ PL_faketokens
+ PL_thismad
+ PL_thistoken
+ PL_thisopen
+ PL_thisstuff
+ PL_thisclose
+ PL_thiswhite
+ PL_nextwhite
+ PL_skipwhite
+ PL_endwhite
+ PL_curforce
+ Perl_pad_peg
+ Perl_xmldump_indent
+ Perl_xmldump_vindent
+ Perl_xmldump_all
+ Perl_xmldump_packsubs
+ Perl_xmldump_sub
+ Perl_xmldump_form
+ Perl_xmldump_eval
+ Perl_sv_catxmlsv
+ Perl_sv_catxmlpvn
+ Perl_sv_xmlpeek
+ Perl_do_pmop_xmldump
+ Perl_pmop_xmldump
+ Perl_do_op_xmldump
+ Perl_op_xmldump
+ )];
+}
+
+unless ($define{'PERL_GLOBAL_STRUCT_PRIVATE'}) {
+ skip_symbols [qw(
+ PL_my_cxt_keys
+ Perl_my_cxt_index
+ )];
+}
+
+unless ($define{'d_mmap'}) {
+ skip_symbols [qw(
+ PL_mmap_page_size
+ )];
+}
+
+if ($define{'d_sigaction'}) {
+ skip_symbols [qw(
+ PL_sig_trapped
+ )];
+}
+
+if ($^O ne 'vms') {
+ # VMS does its own thing for these symbols.
+ skip_symbols [qw(PL_sig_handlers_initted
+ PL_sig_ignoring
+ PL_sig_defaulting)];
+}
+
sub readvar {
my $file = shift;
my $proc = shift || sub { "PL_$_[2]" };
my @syms;
while (<VARS>) {
# All symbols have a Perl_ prefix because that's what embed.h
- # sticks in front of them.
- push(@syms, &$proc($1,$2,$3)) if (/\bPERLVAR(A?I?C?)\(([IGT])(\w+)/);
+ # sticks in front of them. The A?I?S?C? is strictly speaking
+ # wrong.
+ push(@syms, &$proc($1,$2,$3)) if (/\bPERLVAR(A?I?S?C?)\(([IGT])(\w+)/);
}
close(VARS);
return \@syms;
skip_symbols $global;
emit_symbol('Perl_GetVars');
emit_symbols [qw(PL_Vars PL_VarsPtr)] unless $CCTYPE eq 'GCC';
+} else {
+ skip_symbols [qw(Perl_init_global_struct Perl_free_global_struct)];
}
# functions from *.sym files
# These are in _addition to_ the public face of the abstraction
# and need to be exported to allow XS modules to implement layers
my @layer_syms = qw(
- PerlIOBase_clearerr
- PerlIOBase_close
- PerlIOBase_dup
- PerlIOBase_eof
- PerlIOBase_error
- PerlIOBase_fileno
- PerlIOBase_pushed
- PerlIOBase_binmode
- PerlIOBase_popped
- PerlIOBase_read
- PerlIOBase_setlinebuf
- PerlIOBase_unread
- PerlIOBase_noop_ok
- PerlIOBase_noop_fail
- PerlIOBuf_bufsiz
- PerlIOBuf_fill
- PerlIOBuf_flush
- PerlIOBuf_get_base
- PerlIOBuf_get_cnt
- PerlIOBuf_get_ptr
- PerlIOBuf_open
- PerlIOBuf_pushed
- PerlIOBuf_popped
- PerlIOBuf_read
- PerlIOBuf_seek
- PerlIOBuf_set_ptrcnt
- PerlIOBuf_tell
- PerlIOBuf_unread
- PerlIOBuf_write
- PerlIO_debug
- PerlIO_allocate
- PerlIO_apply_layera
- PerlIO_apply_layers
- PerlIO_arg_fetch
- PerlIO_define_layer
- PerlIO_modestr
- PerlIO_parse_layers
- PerlIO_layer_fetch
- PerlIO_list_free
- PerlIO_apply_layera
- PerlIO_pending
- PerlIO_push
- PerlIO_pop
- PerlIO_sv_dup
- PerlIO_perlio
-
-Perl_PerlIO_clearerr
-Perl_PerlIO_close
-Perl_PerlIO_eof
-Perl_PerlIO_error
-Perl_PerlIO_fileno
-Perl_PerlIO_fill
-Perl_PerlIO_flush
-Perl_PerlIO_get_base
-Perl_PerlIO_get_bufsiz
-Perl_PerlIO_get_cnt
-Perl_PerlIO_get_ptr
-Perl_PerlIO_read
-Perl_PerlIO_seek
-Perl_PerlIO_set_cnt
-Perl_PerlIO_set_ptrcnt
-Perl_PerlIO_setlinebuf
-Perl_PerlIO_stderr
-Perl_PerlIO_stdin
-Perl_PerlIO_stdout
-Perl_PerlIO_tell
-Perl_PerlIO_unread
-Perl_PerlIO_write
-
+ PerlIOBase_binmode
+ PerlIOBase_clearerr
+ PerlIOBase_close
+ PerlIOBase_dup
+ PerlIOBase_eof
+ PerlIOBase_error
+ PerlIOBase_fileno
+ PerlIOBase_noop_fail
+ PerlIOBase_noop_ok
+ PerlIOBase_popped
+ PerlIOBase_pushed
+ PerlIOBase_read
+ PerlIOBase_setlinebuf
+ PerlIOBase_unread
+ PerlIOBuf_bufsiz
+ PerlIOBuf_close
+ PerlIOBuf_dup
+ PerlIOBuf_fill
+ PerlIOBuf_flush
+ PerlIOBuf_get_base
+ PerlIOBuf_get_cnt
+ PerlIOBuf_get_ptr
+ PerlIOBuf_open
+ PerlIOBuf_popped
+ PerlIOBuf_pushed
+ PerlIOBuf_read
+ PerlIOBuf_seek
+ PerlIOBuf_set_ptrcnt
+ PerlIOBuf_tell
+ PerlIOBuf_unread
+ PerlIOBuf_write
+ PerlIO_allocate
+ PerlIO_apply_layera
+ PerlIO_apply_layers
+ PerlIO_arg_fetch
+ PerlIO_debug
+ PerlIO_define_layer
+ PerlIO_isutf8
+ PerlIO_layer_fetch
+ PerlIO_list_free
+ PerlIO_modestr
+ PerlIO_parse_layers
+ PerlIO_pending
+ PerlIO_perlio
+ PerlIO_pop
+ PerlIO_push
+ PerlIO_sv_dup
+ Perl_PerlIO_clearerr
+ Perl_PerlIO_close
+ Perl_PerlIO_context_layers
+ Perl_PerlIO_eof
+ Perl_PerlIO_error
+ Perl_PerlIO_fileno
+ Perl_PerlIO_fill
+ Perl_PerlIO_flush
+ Perl_PerlIO_get_base
+ Perl_PerlIO_get_bufsiz
+ Perl_PerlIO_get_cnt
+ Perl_PerlIO_get_ptr
+ Perl_PerlIO_read
+ Perl_PerlIO_seek
+ Perl_PerlIO_set_cnt
+ Perl_PerlIO_set_ptrcnt
+ Perl_PerlIO_setlinebuf
+ Perl_PerlIO_stderr
+ Perl_PerlIO_stdin
+ Perl_PerlIO_stdout
+ Perl_PerlIO_tell
+ Perl_PerlIO_unread
+ Perl_PerlIO_write
);
if ($PLATFORM eq 'netware') {
push(@layer_syms,'PL_def_layerlist','PL_known_layers','PL_perlio');
if ($define{'USE_SFIO'}) {
# Old legacy non-stdio "PerlIO"
skip_symbols \@layer_syms;
+ skip_symbols [qw(perlsio_binmode)];
# SFIO defines most of the PerlIO routines as macros
# So undo most of what $perlio_sym has just done - d'oh !
# Perhaps it would be better to list the ones which do exist
else {
# PerlIO with layers - export implementation
emit_symbols \@layer_syms;
+ emit_symbols [qw(perlsio_binmode)];
+ }
+ if ($define{'USE_ITHREADS'}) {
+ emit_symbols [qw(
+ PL_perlio_mutex
+ )];
+ }
+ else {
+ skip_symbols [qw(
+ PL_perlio_mutex
+ )];
}
} else {
# -Uuseperlio
# Skip the PerlIO layer symbols - although
- # nothing should have exported them any way
+ # nothing should have exported them anyway.
skip_symbols \@layer_syms;
- skip_symbols [qw(PL_def_layerlist PL_known_layers PL_perlio)];
+ skip_symbols [qw(
+ perlsio_binmode
+ PL_def_layerlist
+ PL_known_layers
+ PL_perlio
+ PL_perlio_debug_fd
+ PL_perlio_fd_refcnt
+ PL_perlio_fd_refcnt_size
+ )];
# Also do NOT add abstraction symbols from $perlio_sym
# abstraction is done as #define to stdio
# variables
if ($define{'MULTIPLICITY'}) {
- for my $f ($perlvars_h, $intrpvar_h, $thrdvar_h) {
+ for my $f ($perlvars_h, $intrpvar_h) {
my $glob = readvar($f, sub { "Perl_" . $_[1] . $_[2] . "_ptr" });
emit_symbols $glob;
}
my $glob = readvar($intrpvar_h);
emit_symbols $glob;
}
- unless ($define{'MULTIPLICITY'}) {
- my $glob = readvar($thrdvar_h);
- emit_symbols $glob;
- }
}
sub try_symbol {
Perl_init_os_extras
Perl_thread_create
Perl_win32_init
+ Perl_win32_term
RunPerl
win32_async_check
win32_errno
win32_pclose
win32_rename
win32_setmode
+ win32_chsize
win32_lseek
win32_tell
win32_dup
win32_rewinddir
win32_closedir
win32_longpath
+ win32_ansipath
win32_os_id
win32_getpid
win32_crypt
{
try_symbol($symbol);
}
+ if ($CCTYPE eq "BORLAND") {
+ try_symbol('_matherr');
+ }
}
elsif ($PLATFORM eq 'os2') {
+ my (%mapped, @missing);
open MAP, 'miniperl.map' or die 'Cannot read miniperl.map';
/^\s*[\da-f:]+\s+(\w+)/i and $mapped{$1}++ foreach <MAP>;
close MAP or die 'Cannot close miniperl.map';
}
}
+# records of type boot_module for statically linked modules (except Dynaloader)
+$static_ext =~ s/\//__/g;
+$static_ext =~ s/\bDynaLoader\b//;
+my @stat_mods = map {"boot_$_"} grep {/\S/} split /\s+/, $static_ext;
+foreach my $symbol (@stat_mods)
+ {
+ try_symbol($symbol);
+ }
+
+try_symbol("init_Win32CORE") if $static_ext =~ /\bWin32CORE\b/;
+
# Now all symbols should be defined because
# next we are going to output them.
}
if ($PLATFORM eq 'os2') {
- print "; LAST_ORDINAL=$sym_ord\n";
+ print <<EOP;
+ dll_perlmain=main
+ fill_extLibpath
+ dir_subst
+ Perl_OS2_handler_install
+
+; LAST_ORDINAL=$sym_ord
+EOP
}
sub emit_symbol {
1;
__DATA__
-# extra globals not included above.
-Perl_cxinc
-perl_alloc
-perl_alloc_using
-perl_clone
-perl_clone_using
-perl_construct
-perl_destruct
-perl_free
-perl_parse
-perl_run
# Oddities from PerlIO
PerlIO_binmode
PerlIO_getpos
PerlIO_sv_dup
PerlIO_tmpfile
PerlIO_vsprintf
-perlsio_binmode
https://perl5.git.perl.org / perl5.git / blobdiff