# -*-Makefile-*-
-# This Makefile fragment is shared between fileutils, sh-utils, textutils,
-# and Autoconf.
+# This Makefile fragment is shared between the coreutils,
+# CPPI, Bison, and Autoconf.
-## Copyright 2001 Free Software Foundation, Inc.
+## Copyright (C) 2001-2003 Free Software Foundation, Inc.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
-prev_version_file ?= .prev-version
+# This is reported not to work with make-3.79.1
+# ME := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
+ME := Makefile.maint
+
+# Do not save the original name or timestamp in the .tar.gz file.
+GZIP_ENV = '--no-name --best --rsyncable'
+
+CVS = cvs
+
+ifeq ($(origin prev_version_file), undefined)
+ prev_version_file = .prev-version
+endif
-THIS_VERSION_REGEXP = $(subst .,\.,$(VERSION))
PREV_VERSION := $(shell cat $(prev_version_file))
-PREV_VERSION_REGEXP := $(shell echo $(PREV_VERSION)|sed 's/\./\\./g')
tag-package = $(shell echo "$(PACKAGE)" | tr '[:lower:]' '[:upper:]')
tag-this-version = $(subst .,_,$(VERSION))
-tag-prev-version = $(subst .,_,$(PREV_VERSION))
this-cvs-tag = $(tag-package)-$(tag-this-version)
-prev-cvs-tag = $(tag-package)-$(tag-prev-version)
my_distdir = $(PACKAGE)-$(VERSION)
# Old releases are stored here.
# Used for diffs and xdeltas.
release_archive_dir ?= ../release
+# Prevent programs like 'sort' from considering distinct strings to be equal.
+# Doing it here saves us from having to set LC_ALL elsewhere in this file.
+export LC_ALL = C
+
## --------------- ##
## --------------- ##
# Checks that don't require cvs.
-local-check: changelog-check po-check writable-files copyright-check
+# Run `changelog-check' last, as previous test may reveal problems requiring
+# new ChangeLog entries.
+local-checks-available = \
+ po-check copyright-check writable-files m4-check author_mark_check \
+ changelog-check strftime-check syntax-check makefile_path_separator_check \
+ makefile-check
+.PHONY: $(local-checks-available)
+
+local-check = $(filter-out $(local-checks-to-skip), $(local-checks-available))
+
+# Make sure C source files in src/ don't include xalloc.h directly,
+# since they all already include it via sys2.h.
+# It's not a big deal -- just aesthetics.
+.PHONY: $(syntax-check-rules)
+syntax-check-rules = \
+ sc_cast_of_argument_to_free \
+ sc_cast_of_x_alloc_return_value \
+ sc_changelog \
+ sc_error_exit_success \
+ sc_space_tab \
+ sc_sun_os_names \
+ sc_system_h_headers \
+ sc_unmarked_diagnostics \
+ sc_xalloc_h_in_src
+
+syntax-check: $(syntax-check-rules)
+# @grep -E '# *include <(limits|std(def|arg|bool))\.h>' \
+# $$(find -type f -name '*.[chly]') && \
+# { echo '$(ME): found conditional include' 1>&2; \
+# exit 1; } || :
+
+# grep -E '^# *include <(string|stdlib)\.h>' \
+# $(srcdir)/{lib,src}/*.[chy] && \
+# { echo '$(ME): FIXME' 1>&2; \
+# exit 1; } || :
+# FIXME: don't allow `#include .strings\.h' anywhere
+
+# Look for diagnostics that aren't marked for translation.
+# This won't find any for which error's format string is on a separate line.
+sc_unmarked_diagnostics:
+ @grep --exclude=$(srcdir)/src/shred.c -E \
+ '\<error \([^"]*"[^"]*[a-z]{3}' $(srcdir)/{lib,src}/*.c \
+ | grep -v '_(' && \
+ { echo '$(ME): found unmarked diagnostic(s)' 1>&2; \
+ exit 1; } || :
+
+sc_cast_of_argument_to_free:
+ @grep -E '\<free \(\(' $(srcdir)/{lib,src}/*.[chly] && \
+ { echo '$(ME): don'\''t cast free argument' 1>&2; \
+ exit 1; } || :
+
+sc_cast_of_x_alloc_return_value:
+ @grep -E --exclude=$(srcdir)/lib/regex.c \
+ '\*\) *x(m|c|re)alloc\>' $(srcdir)/{lib,src}/*.[chy] && \
+ { echo '$(ME): don'\''t cast x*alloc return value' 1>&2; \
+ exit 1; } || :
+
+sc_space_tab:
+ @( cvsu --list ) > /dev/null 2>&1 || : && \
+ grep '[ ] ' \
+ $$(cvsu --list | grep -vEf .x-$@ ) && \
+ { echo '$(ME): found SPACE-TAB sequence; remove the SPACE' \
+ 1>&2; exit 1; } || :
+
+# Using EXIT_SUCCESS as the first argument to error is misleading,
+# since when that parameter is 0, error does not exit. Use `0' instead.
+sc_error_exit_success:
+ @grep -F 'error (EXIT_SUCCESS,' \
+ $$(find -type f -name '*.[chly]') && \
+ { echo '$(ME): found error (EXIT_SUCCESS' 1>&2; \
+ exit 1; } || :
+
+# FIXME: merge this with sc_system_h_headers below.
+# xalloc.h is included via system.h, so should not be included
+# directly by any file in src/.
+sc_xalloc_h_in_src:
+ @if test -f $(srcdir)/src/sys2.h; then \
+ if grep 'xalloc\.h' $(srcdir)/src/*.c; then \
+ exit 1; \
+ fi; \
+ fi
+
+# FIXME: warn about definitions of EXIT_FAILURE, EXIT_SUCCESS, STREQ
+
+# Each nonempty line must start with a year number, or a TAB.
+sc_changelog:
+ @grep '^[^12 ]' $$(find . -name ChangeLog -maxdepth 2) && \
+ { echo '$(ME): found unexpected prefix in a ChangeLog' 1>&2; \
+ exit 1; } || :
+
+header_regexp = \
+ alloca\
+ |closeout\
+ |ctype\
+ |dirent\
+ |errno\
+ |fcntl\
+ |inttypes\
+ |limits\
+ |locale\
+ |pathmax\
+ |std(lib|bool)\
+ |string\
+ |sys/(stat|dir|time)\
+ |time\
+ |unistd\
+ |utime\
+ |version-etc\
+ |xalloc
+h_re := $(shell echo '$(header_regexp)'|tr -d ' ')
+
+# Files in src/ should not include directly any of
+# the headers already included via system.h.
+# Get list of candidates with this:
+# grep -h include src/sys*.h|sed 's/.*include //'|sort -
+sc_system_h_headers:
+ @( cvsu --list ) > /dev/null 2>&1 || : && \
+ grep -E '^# *include ["<]($(h_re))\.h[">]' \
+ $$(cvsu --list src | grep -Ev 'sys(2|tem)\.h$$') \
+ && { echo '$(ME): the above are already included via system.h'\
+ 1>&2; exit 1; } || :
+
+sc_sun_os_names:
+ @( cvsu --list ) > /dev/null 2>&1 || : && \
+ grep -Ei \
+ 'solaris[^[:alnum:]]*2\.(7|8|9|[1-9][0-9])|sunos[^[:alnum:]][6-9]' \
+ $$(cvsu --list | grep -vEf .x-$@ ) && \
+ { echo '$(ME): found misuse of Sun OS version numbers' 1>&2; \
+ exit 1; } || :
+
+# Ensure that date's --help output stays in sync with the info
+# documentation for GNU strftime. The only exception is %N,
+# which date accepts but GNU strftime does not.
+extract_char = sed 's/^[^%][^%]*%\(.\).*/\1/'
+strftime-check:
+ if test -f $(srcdir)/src/date.c; then \
+ grep '^ %. ' $(srcdir)/src/date.c | sort \
+ | $(extract_char) > $@-src; \
+ { echo N; \
+ info libc date calendar format | grep '^ `%.'\' \
+ | $(extract_char); } | sort > $@-info; \
+ diff -u $@-src $@-info || exit 1; \
+ rm -f $@-src $@-info; \
+ fi
+
+# Ensure that we use only the standard $(VAR) notation,
+# not @...@ in Makefile.am, now that we can rely on automake
+# to emit a definition for each substituted variable.
+makefile-check:
+ grep -E '@[A-Z_0-9]+@' `find . -name Makefile.am` \
+ && { echo 'Makefile.maint: use $(...), not @...@' 1>&2; exit 1; } || :
changelog-check:
if head ChangeLog | grep 'Version $(VERSION)' >/dev/null; then \
exit 1; \
fi
+m4-check:
+ @grep 'AC_DEFUN([^[]' m4/*.m4 \
+ && { echo 'Makefile.maint: quote the first arg to AC_DEFUN' 1>&2; \
+ exit 1; } || :
+
# Verify that all source files using _() are listed in po/POTFILES.in.
po-check:
if test -f po/POTFILES.in; then \
grep -E -v '^(#|$$)' po/POTFILES.in | sort > $@-1; \
- grep -E -l '\b_\(' lib/*.c src/*.c | sort > $@-2; \
+ files=; \
+ for file in lib/*.[chly] src/*.[chly]; do \
+ case $$file in \
+ *.[ch]) \
+ base=`expr " $$file" : ' \(.*\)\..'`; \
+ { test -f $$base.l || test -f $$base.y; } && continue;; \
+ esac; \
+ files="$$files $$file"; \
+ done; \
+ grep -E -l '\bN?_\([^)"]*("|$$)' $$files | sort > $@-2; \
diff -u $@-1 $@-2 || exit 1; \
rm -f $@-1 $@-2; \
fi
+# In a definition of #define AUTHORS "... and ..." where the RHS contains
+# the English word `and', the string must be marked with `N_ (...)' so that
+# gettext recognizes it as a string requiring translation.
+author_mark_check:
+ @grep '^# *define AUTHORS "[^"]* and ' src/*.c |grep -v ' N_ (' && \
+ { echo 'Makefile.maint: enclose the above strings in N_ (...)' 1>&2; \
+ exit 1; } || :
+
+# Sometimes it is useful to change the PATH environment variable
+# in Makefiles. When doing so, it's better not to use the Unix-centric
+# path separator of `:', but rather the automake-provided `@PATH_SEPARATOR@'.
+# It'd be better to use `find -print0 ...|xargs -0 ...', but less portable,
+# and there probably aren't many projects with so many Makefile.am files
+# that we'd have to worry about limits on command line length.
+msg = 'Makefile.maint: Do not use `:'\'' above; use @PATH_SEPARATOR@ instead'
+makefile_path_separator_check:
+ @grep 'PATH=.*:' `find $(srcdir) -name Makefile.am` \
+ && { echo $(msg) 1>&2; exit 1; } || :
+
# Check that `make alpha' will not fail at the end of the process.
writable-files:
if test -d $(release_archive_dir); then :; else \
done; \
test "$$fail" && exit 1 || :
-# Make sure that the copyright date in lib/version-etc.c is up to date.
+v_etc_file = lib/version-etc.c
+# Make sure that the copyright date in $(v_etc_file) is up to date.
copyright-check:
- @if test -f lib/version-etc.c; then \
- grep 'N_("Copyright (C) $(shell date +%Y) Free' lib/version-etc.c \
+ @if test -f $(v_etc_file); then \
+ grep '"Copyright (C) $(shell date +%Y) Free' $(v_etc_file) \
>/dev/null \
- || { echo 'out of date copyright in $<; update it' 1>&2; exit 1; }; \
+ || { echo 'out of date copyright in $(v_etc_file); update it' 1>&2; \
+ exit 1; }; \
fi
# Sanity checks with the CVS repository.
cvs-tag-check:
echo $(this-cvs-tag); \
- if cvs -n log -h README | grep -e $(this-cvs-tag): >/dev/null; then \
+ if $(CVS) -n log -h README | grep -e $(this-cvs-tag): >/dev/null; then \
echo "$(this-cvs-tag) as already been used; not tagging" 1>&2; \
exit 1; \
else :; fi
cvs-diff-check:
- if cvs diff >cvs-diffs; then \
- rm cvs-diffs; \
- else \
- echo "Some files are locally modified:" 1>&2; \
+ if $(CVS) diff >cvs-diffs; then \
+ rm cvs-diffs; \
+ else \
+ echo "Some files are locally modified:" 1>&2; \
cat cvs-diffs; \
exit 1; \
fi
$(MAKE) my-distcheck
-# Do not save the original name or timestamp in the .tar.gz file.
-GZIP_ENV = '--no-name --best'
-
-# Automake 1.4 does not define AMTAR.
-AMTAR ?= $(TAR)
-
# Tag before making distribution. Also, don't make a distribution if
# checks fail. Also, make sure the NEWS file is up-to-date.
# FIXME: use dist-hook/my-dist like distcheck-hook/my-distcheck.
-cvs-dist: cvs-check maintainer-distcheck
- cvs update po
- cvs tag -c $(this-cvs-tag)
+cvs-dist: $(local-check) cvs-check maintainer-distcheck
+ $(CVS) update po
+ $(CVS) tag -c $(this-cvs-tag)
$(MAKE) dist
# Use this to make sure we don't run these programs when building
# by the use of _(). The --disable-nls effectively defines away that macro,
# and building with CFLAGS='-Wformat -Werror' causes any format warning to be
# treated as a failure.
-t=./=test
-my-distcheck: writable-files po-check
+TMPDIR ?= /tmp
+t=$(TMPDIR)/$(PACKAGE)/test
+my-distcheck: $(local-check)
-rm -rf $(t)
- mkdir $(t)
+ mkdir -p $(t)
GZIP=$(GZIP_ENV) $(AMTAR) -C $(t) -zxf $(distdir).tar.gz
cd $(t)/$(distdir) \
&& ./configure --disable-nls \
&& $(MAKE) dvi \
&& $(MAKE) check \
&& $(MAKE) distclean
- cd $(t) && mv $(distdir) $(distdir).old \
- && $(AMTAR) -zxf ../$(distdir).tar.gz
+ (cd $(t) && mv $(distdir) $(distdir).old \
+ && $(AMTAR) -zxf - ) < $(distdir).tar.gz
diff -ur $(t)/$(distdir).old $(t)/$(distdir)
-rm -rf $(t)
@echo "========================"; \
echo "$(distdir).tar.gz is ready for distribution"; \
echo "========================"
-# This must be the same name on both hosts.
-# Make it a symlink that points to the right place.
-real_dir = fetish-ftp
-
-url_dir_list = $(foreach x,$(hosts),ftp://$($(x)_host)/$($(x)_url_dir))
+WGET = wget
+WGETFLAGS = -C off
tgz-md5 = $(shell md5sum < $(my_distdir).tar.gz|sed 's/ -//')
tgz-sha1 = $(shell sha1sum < $(my_distdir).tar.gz|sed 's/ -//')
bz2-md5 = $(shell md5sum < $(my_distdir).tar.bz2|sed 's/ -//')
bz2-sha1 = $(shell sha1sum < $(my_distdir).tar.bz2|sed 's/ -//')
-tgz-size = $(shell du --human $(my_distdir).tar.gz|sed 's/\([Mk]\).*/ \1B/')
-bz2-size = $(shell du --human $(my_distdir).tar.bz2|sed 's/\([Mk]\).*/ \1B/')
-xd-size = $(shell du --human $(xd-delta)|sed 's/\([Mk]\).*/ \1B/')
+xdelta-md5 = $(shell md5sum < $(xd-delta)|sed 's/ -//')
+xdelta-sha1 = $(shell sha1sum < $(xd-delta)|sed 's/ -//')
+tgz-size = $(shell du --human $(my_distdir).tar.gz|sed 's/\([MkK]\).*/ \1B/')
+bz2-size = $(shell du --human $(my_distdir).tar.bz2|sed 's/\([MkK]\).*/ \1B/')
+xd-size = $(shell du --human $(xd-delta)|sed 's/\([MkK]\).*/ \1B/')
rel-check:
tarz=/tmp/rel-check-tarz-$$$$; \
md5_tmp=/tmp/rel-check-md5-$$$$; \
set -e; \
trap 'status=$$?; rm -f $$tarz $$md5_tmp; exit $$status' 0 1 2 3 15; \
- wget -q --output-document=$$tarz $(url); \
+ $(WGET) $(WGETFLAGS) -q --output-document=$$tarz $(url); \
echo "$(md5) -" > $$md5_tmp; \
md5sum -c $$md5_tmp < $$tarz
prev-tgz = $(PACKAGE)-$(PREV_VERSION).tar.gz
xd-delta = $(PACKAGE)-$(PREV_VERSION)-$(VERSION).xdelta
-GZIP = gzip
-BZIP2 = bzip2
-$(my_distdir).tar.bz2: $(my_distdir).tar.gz
- $(GZIP) -dc $< > $(my_distdir).tar
+signatures ?= $(distdir).tar.bz2.asc $(distdir).tar.gz.asc
+%.asc: %
rm -f $@
- $(BZIP2) -9 $(my_distdir).tar
-
-rel-files = $(xd-delta) $(distdir).tar.bz2 $(distdir).tar.gz
-announcement: NEWS ChangeLog $(rel-files)
- @( \
- echo Subject: $(my_distdir) released; \
- echo; \
- echo FIXME: put comments here; \
- echo; \
- for url in $(url_dir_list); do \
- echo " $$url/$(my_distdir).tar.gz ($(tgz-size))"; \
- echo " $$url/$(my_distdir).tar.bz2 ($(bz2-size))"; \
- done; \
- echo; \
- echo And here are xdelta-style diffs; \
- echo; \
- for url in $(url_dir_list); do \
- echo " $$url/$(xd-delta) ($(xd-size))"; \
- done; \
- echo; \
- echo "Here are the MD5 and SHA1 signatures for the compressed tar files:"; \
- echo; \
- echo "$(tgz-md5) $(my_distdir).tar.gz"; \
- echo "$(bz2-md5) $(my_distdir).tar.bz2"; \
- echo "$(tgz-sha1) $(my_distdir).tar.gz"; \
- echo "$(bz2-sha1) $(my_distdir).tar.bz2"; \
- echo; \
- echo NEWS:; \
- sed -n "/$(THIS_VERSION_REGEXP)[]:]/,/$(PREV_VERSION_REGEXP)[]:]/p" NEWS \
- | grep -v '^\['; \
- echo; \
- echo ChangeLog entries:; \
- find . -name ChangeLog -maxdepth 2 \
- | xargs cvs diff -up -r$(prev-cvs-tag) -rHEAD \
- | sed -n 's/^+//p' \
- | perl -ne 'm!^\+\+ (\./)?! or print,next;' \
- -e 'print "\n"."*"x70 ."\n"; s///; print; print "*"x70 ."\n"'; \
- )
+ gpg --armor --detach-sign -o $@ $<
+
+rel-files = $(xd-delta) $(distdir).tar.bz2 $(distdir).tar.gz $(signatures)
+announce_gen ?= ./announce-gen
+announcement: NEWS ChangeLog $(rel-files) $(signatures)
+ @$(announce_gen) \
+ --release-type=$(RELEASE_TYPE) \
+ --package=$(PACKAGE) \
+ --prev=$(PREV_VERSION) \
+ --curr=$(VERSION) \
+ --release-archive-directory=$(release_archive_dir) \
+ --news=NEWS \
+ $(addprefix --url-dir=, $(url_dir_list)) \
+
+
+## ---------------- ##
+## Updating files. ##
+## ---------------- ##
-WGET = wget
ftp-gnu = ftp://ftp.gnu.org/gnu
+www-gnu = http://www.gnu.org
# Use mv, if you don't have/want move-if-change.
move_if_change ?= move-if-change
+
+# --------------------- #
+# Updating everything. #
+# --------------------- #
+
+.PHONY: update
+local_updates ?= wget-update cvs-update po-update
+update: $(local_updates)
+
+
+# ------------------- #
+# Updating PO files. #
+# ------------------- #
+
+po_repo = http://www.iro.umontreal.ca/contrib/po/maint/$(PACKAGE)
+.PHONY: do-po-update po-update
+do-po-update:
+ tmppo=/tmp/$(PACKAGE)-$(VERSION)-po &&\
+ rm -rf $$tmppo && \
+ mkdir $$tmppo && \
+ (cd $$tmppo && \
+ $(WGET) $(WGETFLAGS) -r -l1 -nd --no-parent -A '*.po' $(po_repo)) &&\
+ cp $$tmppo/*.po po
+ cd po && $(MAKE) update-po
+ $(MAKE) po-check
+
+po-update:
+ if test -d "po"; then \
+ $(MAKE) do-po-update; \
+ fi
+
+# -------------------------- #
+# Updating GNU build tools. #
+# -------------------------- #
+
# The following pseudo table associates a local directory and a URL
# with each of the files that belongs to some other package and is
# regularly updated from the specified URL.
-wget_files ?= $(srcdir)/config.guess $(srcdir)/config.sub \
+wget_files ?= $(srcdir)/config/config.guess \
+ $(srcdir)/config/config.sub \
$(srcdir)/src/ansi2knr.c \
- $(srcdir)/doc/texinfo.tex
+ $(srcdir)/config/texinfo.tex
get-targets = $(patsubst %, get-%, $(wget_files))
config.guess-url_prefix = $(ftp-gnu)/config/
texinfo.tex-url_prefix = $(ftp-gnu)/texinfo/
-standards.texi-url_prefix = $(ftp-gnu)/GNUinfo/
-make-stds.texi-url_prefix = $(ftp-gnu)/GNUinfo/
+standards.texi-url_prefix = $(www-gnu)/prep/
+make-stds.texi-url_prefix = $(standards.texi-url_prefix)
target = $(patsubst get-%, %, $@)
url = $($(notdir $(target))-url_prefix)$(notdir $(target))
.PHONY: $(get-targets)
$(get-targets):
- $(WGET) $(url) -O $(target).t \
+ $(WGET) $(WGETFLAGS) $(url) -O $(target).t \
&& $(move_if_change) $(target).t $(target)
-automake_repo=:pserver:anoncvs@anoncvs.cygnus.com:/cvs/automake
+cvs_files ?= \
+ $(srcdir)/src/ansi2knr.c \
+ $(srcdir)/config/depcomp \
+ $(srcdir)/config/install-sh \
+ $(srcdir)/config/missing \
+ $(srcdir)/config/mkinstalldirs
+automake_repo=:pserver:anoncvs:anoncvs@sources.redhat.com:/cvs/automake
.PHONY: wget-update
wget-update: $(get-targets)
- for f in depcomp missing; do \
- test -f $$f || continue; \
- echo checking out $$f...; \
- cvs -d $(automake_repo) co -p automake/lib/$$f > $$f.t \
- && $(move_if_change) $$f.t $$f; \
- done
-
-define emit-rsync-commands
+
+.PHONY: cvs-update
+cvs-update:
+ fail=; \
+ for f in $(cvs_files); do \
+ test -f $$f || { echo "*** skipping $$f" 1>&2; continue; }; \
+ cvs diff $$f > /dev/null \
+ || { echo "*** $$f is locally modified; skipping it" 1>&2; \
+ fail=yes; continue; }; \
+ file=$$(basename $$f); \
+ echo checking out $$file...; \
+ $(CVS) -d $(automake_repo) co -p automake/lib/$$file> $$f.t \
+ && $(move_if_change) $$f.t $$f; \
+ done; \
+ test "$$fail" && exit 1
+
+define emit-upload-commands
echo =====================================
echo =====================================
- echo 'for host in $(a_host) $(b_host); do \'
- echo ' rsync -e ssh --pro -av $(xd-delta) $(my_distdir).tar.bz2 \'
- echo ' $(my_distdir).tar.gz $$host:$(real_dir); done'
+ echo upload $(PACKAGE) $(PREV_VERSION) $(VERSION)
echo '# send the /tmp/announcement e-mail'
echo =====================================
echo =====================================
$(xd-delta): $(release_archive_dir)/$(prev-tgz) $(distdir).tar.gz
xdelta delta -9 $^ $@ || :
-alpha: local-check
+.PHONY: alpha beta major
+alpha beta major: $(local-check)
$(MAKE) cvs-dist
$(MAKE) $(xd-delta)
- $(MAKE) -s announcement > /tmp/announce-$(my_distdir)
+ $(MAKE) -s announcement RELEASE_TYPE=$@ > /tmp/announce-$(my_distdir)
ln $(rel-files) $(release_archive_dir)
chmod a-w $(rel-files)
echo $(VERSION) > $(prev_version_file)
- cvs ci -m. $(prev_version_file)
- @$(emit-rsync-commands)
+ $(CVS) ci -m. $(prev_version_file)
+ @$(emit-upload-commands)
projects / bison.git / blobdiff