Fix conditional compilation.

* .gitignore: Add git-describe and git-describe.h.
* Makefile.am (MU_COND_LIBMU_CPP): Replaced with MU_COND_SUPPORT_CXX
(SUBDIRS): Begin with .
(EXTRA_DIST, BUILT_SOURCES): Add git-describe and git-describe.h.
(git-describe, git-describe.h): New rules.
(alpha, alphacheck): Use git-describe to produce additional suffix.
* enable.m4 (MU_ENABLE_SUPPORT): Create an Automake condition.
* configure.ac: Fix MU_ENABLE_SUPPORT calls.
(--without-python): Replace with --disable-python.
* examples/Makefile.am: Disable components based on MU_COND conditions.
* libproto/Makefile.am: Likewise.
* include/mailutils/Makefile.am (MU_COND_LIBMU_CPP): Replace with
MU_COND_SUPPORT_CXX.

* mailbox/nullrec.c: New file.
* mailbox/Makefile.am (libmailutils_la_SOURCES): Add nullrec.c.

* mail/decode.c: Remove unused variable.
* mailbox/streamref.c: Likewise.

@@ -22,6 +22,8 @@ config.h.in
 config.log
 config.status
 configure
+git-describe
+git-describe.h
 libtool
 m4
 pathdefs.h

@@ -85,11 +85,11 @@ if MU_COND_LIBMU_SCM
   LIBMU_SCM_DIR = libmu_scm
 endif
 
-if MU_COND_LIBMU_CPP
+if MU_COND_SUPPORT_CXX
   LIBMU_CPP_DIR = libmu_cpp
 endif
 
-SUBDIRS = \
+SUBDIRS = . \
  mu-aux\
  include\
  po\
@@ -124,8 +124,8 @@ SUBDIRS = \
  $(MOVEMAIL_DIR)\
  $(MIMEVIEW_DIR)
 
-EXTRA_DIST = COPYING.LESSER paths
-
+EXTRA_DIST = COPYING.LESSER paths git-describe git-describe.h
+BUILT_SOURCES = git-describe git-describe.h
 DISTCLEANFILES = pathdefs.h
 
 gen_start_date = "2008-12-08"
@@ -155,12 +155,45 @@ ChangeLog:
 	  mv cl-t ChangeLog;                                               \
 	fi
 
-alpha:
-	$(MAKE) dist distdir=$(PACKAGE)-$(VERSION)-`date +"%Y%m%d"`
+.PHONY: git-describe
+git-describe:
+	$(AM_V_GEN)if test -d .git; then \
+		dirty=`git diff-index --name-only HEAD 2>/dev/null` || dirty=;\
+		test -n "$$dirty" && dirty="-dirty"; \
+		descr=`git describe`; \
+		echo $${descr}$$dirty > git-describe; \
+	fi
 
-alphacheck:
-	$(MAKE) distcheck distdir=$(PACKAGE)-$(VERSION)-`date +"%Y%m%d"`
+dist-hook: ChangeLog git-describe
+	@PATCHLEV=`echo "$(PACKAGE_VERSION)" | \
+                   sed -r "s/[0-9]+\.[0-9]+\.?//"`; \
+	if test $${PATCHLEV:-0} -lt 50; then \
+		if grep -q FIXME NEWS; then \
+			echo >&2 "NEWS file contains FIXMEs"; \
+			exit 1; \
+		fi; \
+	fi
+
+git-describe.h: git-describe
+	$(AM_V_GEN)if test -f $(srcdir)/git-describe; then \
+	  sed '1s/.*/#define GIT_DESCRIBE "&"/' $(srcdir)/git-describe; \
+	else \
+          echo "/* No git tag */"; \
+	fi > git-describe.h
+
+alpha: git-describe
+	$(AM_V_GEN)if test -f $(srcdir)/git-describe; then \
+	  tag=`head -n 1 $(srcdir)/git-describe`; \
+	else \
+	  tag=`date +"%Y%m%d"`; \
+	fi; \
+	$(MAKE) dist distdir=$(PACKAGE)-$(VERSION)-$$tag
 
-rpm: dist
-	rpm -ta --clean mailutils-$(VERSION).tar.gz
+alphacheck:
+	$(AM_V_GEN)if test -f $(srcdir)/git-describe; then \
+	  tag=`head -n 1 $(srcdir)/git-describe`; \
+	else \
+	  tag=`date +"%Y%m%d"`; \
+	fi; \
+	$(MAKE) distcheck distdir=$(PACKAGE)-$(VERSION)-$$tag
 

@@ -23,6 +23,7 @@ dnl                   [default-value])
 AC_DEFUN([MU_ENABLE_SUPPORT], [
 	pushdef([mu_upcase],translit($1,[a-z+-],[A-ZX_]))
 	pushdef([mu_cache_var],[mu_cv_enable_]translit($1,[+-],[x_]))
+	pushdef([mu_cond],[MU_COND_SUPPORT_]mu_upcase)
 
 	AC_ARG_ENABLE($1, 
 	              AC_HELP_STRING([--disable-]$1,
@@ -43,8 +44,11 @@ AC_DEFUN([MU_ENABLE_SUPPORT], [
 	if test x"[$]mu_cache_var" = x"yes"; then
 		AC_DEFINE([ENABLE_]mu_upcase,1,[Define this if you enable $1 support])
         fi
-	popdef([mu_upcase])
+	AM_CONDITIONAL(mu_cond,
+	               [test x"[$]mu_cache_var" = x"yes" ifelse($4,,,[&& $4])])
+	popdef([mu_cond])
 	popdef([mu_cache_var])
+	popdef([mu_upcase])
 ])
 
 dnl MU_ENABLE_BUILD(feature, [action-if-true], [action-if-false],

@@ -40,16 +40,16 @@ dnl Library paths
 AC_SUBST(MU_LIB_AUTH,'${top_builddir}/libmu_auth/libmu_auth.la')
 AC_SUBST(MU_LIB_MAILUTILS,'${top_builddir}/mailbox/libmailutils.la')
 AC_SUBST(MU_LIB_SQL,'${top_builddir}/sql/libsql.la')
-AC_SUBST(MU_LIB_IMAP,'${top_builddir}/libproto/imap/libmu_imap.la')
-AC_SUBST(MU_LIB_MAILDIR,'${top_builddir}/libproto/maildir/libmu_maildir.la')
+AC_SUBST(MU_LIB_IMAP)
+AC_SUBST(MU_LIB_MAILDIR)
 AC_SUBST(MU_LIB_MAILER,'${top_builddir}/libproto/mailer/libmu_mailer.la')
 AC_SUBST(MU_LIB_MBOX,'${top_builddir}/libproto/mbox/libmu_mbox.la')
-AC_SUBST(MU_LIB_MH,'${top_builddir}/libproto/mh/libmu_mh.la')
-AC_SUBST(MU_LIB_NNTP,'${top_builddir}/libproto/nntp/libmu_nntp.la')
-AC_SUBST(MU_LIB_POP,'${top_builddir}/libproto/pop/libmu_pop.la')
+AC_SUBST(MU_LIB_MH)
+AC_SUBST(MU_LIB_NNTP)
+AC_SUBST(MU_LIB_POP)
 AC_SUBST(MU_LIB_SIEVE,'${top_builddir}/libmu_sieve/libmu_sieve.la')
-AC_SUBST(MU_LIB_SCM,'${top_builddir}/libmu_scm/libmu_scm.la')
-AC_SUBST(MU_LIB_CPP,'${top_builddir}/libmu_cpp/libmu_cpp.la')
+AC_SUBST(MU_LIB_SCM)
+AC_SUBST(MU_LIB_CPP)
 AC_SUBST(MU_LIB_ARGP,'${top_builddir}/libmu_argp/libmu_argp.la')
 AC_SUBST(MU_LIB_PY)
 
@@ -805,9 +805,17 @@ AC_ARG_WITH([virtual-pwddir],
 		*)  SITE_VIRTUAL_PWDDIR="\$(sysconfdir)/${withval}";;
 	     esac],
              [SITE_VIRTUAL_PWDDIR="\$(sysconfdir)/domain"])
-MU_ENABLE_SUPPORT(imap)
-MU_ENABLE_SUPPORT(pop)
-MU_ENABLE_SUPPORT(nntp)
+	     
+MU_ENABLE_SUPPORT([imap],
+         [MU_LIB_IMAP='${top_builddir}/libproto/imap/libmu_imap.la'])
+MU_ENABLE_SUPPORT([pop],
+         [MU_LIB_POP='${top_builddir}/libproto/pop/libmu_pop.la'])
+MU_ENABLE_SUPPORT([nntp],
+         [MU_LIB_NNTP='${top_builddir}/libproto/nntp/libmu_nntp.la'])
+MU_ENABLE_SUPPORT([mh],
+         [MU_LIB_MH='${top_builddir}/libproto/mh/libmu_mh.la'])
+MU_ENABLE_SUPPORT([maildir],
+         [MU_LIB_MAILDIR='${top_builddir}/libproto/maildir/libmu_maildir.la'])
 
 AC_SUBST(MU_SMTP_PROGRAMS_BUILD)
 AC_SUBST(MU_SMTP_DEJATOOL)
@@ -819,9 +827,6 @@ MU_ENABLE_SUPPORT(sendmail)
 
 MU_ENABLE_SUPPORT(prog)
 
-MU_ENABLE_SUPPORT(mh)
-
-MU_ENABLE_SUPPORT(maildir)
 
 # FIXME: Should be --with-radius 
 MU_ENABLE_SUPPORT(radius,
@@ -1091,14 +1096,14 @@ fi
 AC_SUBST(lisp_LISP)
 
 # Check for Python
-AC_ARG_WITH([python],
-            AC_HELP_STRING([--without-python],
-                           [do not build Python interface]),
-            [
-case "${withval}" in
+AC_ARG_ENABLE([python],
+              AC_HELP_STRING([--disable-python],
+                             [do not build Python interface]),
+              [
+case "${enableval}" in
   yes) status_python=yes ;;
   no)  status_python=no ;;
-  *)   AC_MSG_ERROR(bad value ${withval} for --without-python) ;;
+  *)   AC_MSG_ERROR(bad value ${enableval} for --enable-python) ;;
 esac],[status_python=yes])
 
 AC_SUBST(PYTHON_LIBS)
@@ -1138,8 +1143,8 @@ AM_CONDITIONAL([MU_COND_PYTHON], [test "$status_python" = yes])
 
 AC_SUBST(MU_CXX_EXAMPLES_BUILD)
 MU_ENABLE_SUPPORT(cxx,
-  	          [MU_CXX_EXAMPLES_BUILD='$(MU_CXX_EXAMPLES_LIST)'])
-AM_CONDITIONAL([MU_COND_LIBMU_CPP], [test "$mu_cv_enable_cxx" = yes])
+  	          [MU_CXX_EXAMPLES_BUILD='$(MU_CXX_EXAMPLES_LIST)'
+                   MU_LIB_CPP='${top_builddir}/libmu_cpp/libmu_cpp.la'])
 
 # Default mailbox record
 # Note: 1. Support for mbox type is always enabled.
@@ -1224,12 +1229,13 @@ case `echo $VERSION|sed  's/[[^.]]//g'` in
 "..")  if test `echo $VERSION | sed  's/.*\.//'` -lt 50; then
 	 RENDITION=DISTRIB
        else
+         AC_DEFINE_UNQUOTED([MU_ALPHA_RELEASE], 1,
+	                    [Define if this is an alpha release])
          RENDITION=PROOF
        fi;;
 *)     RENDITION=PROOF;;
 esac
 
-
 AC_CONFIG_COMMANDS([status],[
 cat <<EOF
 

@@ -18,7 +18,19 @@
 ##   Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA
 ##   02110-1301 USA
 
-SUBDIRS = config cpp python scheme
+if MU_COND_SUPPORT_POP
+  POP3CLIENT = pop3client
+endif
+
+if MU_COND_SUPPORT_NNTP
+  NNTPCLIENT = nntpclient
+endif
+
+if MU_COND_SUPPORT_CXX
+  CPP_DIR = cpp
+endif
+
+SUBDIRS = config $(CPP_DIR) python scheme
 
 noinst_PROGRAMS = \
  aclck\
@@ -40,11 +52,13 @@ noinst_PROGRAMS = \
  muauth\
  muemail\
  murun\
- nntpclient\
- pop3client \
+ $(NNTPCLIENT)\
+ $(POP3CLIENT)\
  sfrom\
  url-parse
 
+EXTRA_PROGRAMS = pop3client nntpclient
+
 ## NOTE: Numaddr must be an installable target, otherwise libtool
 ## will not create a shared library and `make check' will fail in
 ## sieve. Pity.

@@ -98,7 +98,7 @@ pkginclude_HEADERS = \
  vartab.h\
  version.h
 
-if MU_COND_LIBMU_CPP
+if MU_COND_SUPPORT_CXX
   CPP_DIR = cpp
 endif
 

-/* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 1999, 2000, 2001, 2004, 2005, 2007, 2009, 2010 Free
-   Software Foundation, Inc.
-
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 3 of the License, or (at your option) any later version.
-
-   This library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General
-   Public License along with this library; if not, write to the
-   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301 USA */
-
-#ifndef _MAILUTILS_ARGP_H
-#define _MAILUTILS_ARGP_H
-
-#include <mailutils/types.h>
-#include <argp.h>
-#include <errno.h> /* May declare program_invocation_name */
-
-extern char *mu_license_text;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-extern void mu_argp_init (struct argp *argp, const char *vers,
-			  const char *bugaddr, const char *capa[]);
-extern void mu_argp_done (struct argp *argp);
-  
-extern int mu_register_argp_capa (const char *name, struct argp_child *child);
-
-extern void mu_print_options (void);
-  
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-

@@ -17,5 +17,25 @@
 ##   Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA
 ##   02110-1301 USA
 
-SUBDIRS = include mbox pop nntp imap mh maildir mailer
+if MU_COND_SUPPORT_POP
+  POP_DIR = pop
+endif
+
+if MU_COND_SUPPORT_IMAP
+  IMAP_DIR = imap
+endif
+
+if MU_COND_SUPPORT_NNTP
+  NNTP_DIR = nntp
+endif
+
+if MU_COND_SUPPORT_MH
+  MH_DIR = mh
+endif
+
+if MU_COND_SUPPORT_MAILDIR
+  MAILDIR_DIR = maildir
+endif
+
+SUBDIRS = include mbox $(POP_DIR) $(NNTP_DIR) $(IMAP_DIR) $(MH_DIR) $(MAILDIR_DIR) mailer
 

@@ -318,7 +318,6 @@ print_stream (mu_stream_t stream, FILE *out)
 {
   char buffer[512];
   size_t n = 0;
-  int rc;
   
   while (mu_stream_read (stream, buffer, sizeof (buffer) - 1, &n) == 0
 	 && n != 0)

@@ -114,6 +114,7 @@ libmailutils_la_SOURCES = \
  muerror.c\
  muerrno.c\
  nls.c\
+ nullrec.c\
  observer.c\
  opool.c\
  parse822.c\

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001, 2002, 2004, 
+   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. */
+
+/* This file provides replacement definitions for mu_record_t defined
+   in those MU libraries which are disabled at configure time. */
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <mailutils/types.h>
+#include <mailutils/registrar.h>
+
+#ifndef ENABLE_IMAP
+mu_record_t mu_imap_record = NULL;
+mu_record_t mu_imaps_record = NULL;
+#endif
+
+#ifndef ENABLE_POP
+mu_record_t mu_pop_record = NULL;
+mu_record_t mu_pops_record = NULL;
+#endif
+
+#ifndef ENABLE_NNTP
+mu_record_t mu_nntp_record = NULL;
+#endif
+
+#ifndef ENABLE_MH
+mu_record_t mu_mh_record = NULL;
+#endif
+
+#ifndef ENABLE_MAILDIR
+mu_record_t mu_maildir_record = NULL;
+#endif
+

@@ -156,7 +156,6 @@ static int
 _streamref_seek (struct _mu_stream *str, mu_off_t off, mu_off_t *ppos)
 {
   struct _mu_streamref *sp = (struct _mu_streamref *)str;
-  mu_off_t cur = sp->offset - sp->start;
   mu_off_t size;
   int rc;