autotools: building of binaries optional

When building and installing backends on additional build platforms, linking
the binaries is both unnecessary and sometimes problematic (for example,
helper libraries not available in a version that works).

Therefore configure arguments can be used to disable linking of the binaries.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>

Makefile.am

@@ -351,6 +351,7 @@ RUN_SYNCEVOLUTION_CHECK=die if $$?; return $$buffer;
 endif
 
 # patch README.rst properties on-the-fly
+if COND_CMDLINE
 README.patched.rst: README.rst src/syncevolution
 	$(AM_V_GEN)perl -e '$$syncfound=0; $$sourcefound=0; $$res=0;' \
 	                -e 'sub run { $$cmd = shift; $$buffer = `env LD_LIBRARY_PATH=src/syncevo/.libs:src/gdbus/.libs:src/gdbusxx/.libs:src/build-synthesis/src/.libs:$$ENV{LD_LIBRARY_PATH} $$cmd`; $(RUN_SYNCEVOLUTION_CHECK) }' \
@@ -365,6 +366,14 @@ README.patched.rst: README.rst src/syncevolution
 	                -e 'die "<<source-property>> tag not in README.rst?!" unless $$sourcefound;' \
 	                -e 'exit $$res;' \
 	                $< >$@
+else
+# Simpler version without inserting the actual sync and datastore properties.
+README.patched.rst: README.rst
+	$(AM_V_GEN)perl -p \
+	                -e 's/^:Version: .*/:Version: $(VERSION)/;' \
+	                -e 's/:Date: .*/":Date: " . `date +%Y-%m-%d`/e;' \
+	                $< >$@
+endif
 CLEANFILES += README.patched.rst
 
 # produce man pages

configure.ac

@@ -477,6 +477,18 @@ AC_ARG_ENABLE(core,
               enable_core="$enableval",
               enable_core="yes")
 AM_CONDITIONAL([COND_CORE], [test "$enable_core" = "yes"])
+AC_ARG_ENABLE(cmdline,
+              AS_HELP_STRING([--enable-cmdline],
+                             [enables building the SyncEvolution command line tool, syncevolution]),
+              enable_cmdline="$enableval",
+              enable_cmdline="yes")
+AM_CONDITIONAL([COND_CMDLINE], [test "$enable_cmdline" = "yes"])
+AC_ARG_ENABLE(local-sync,
+              AS_HELP_STRING([--enable-local-sync],
+                             [enables building the local synchronization support, in particular syncevo-local-sync]),
+              enable_local_sync="$enableval",
+              enable_local_sync="yes")
+AM_CONDITIONAL([COND_LOCAL_SYNC], [test "$enable_local_sync" = "yes"])
 
 AC_ARG_ENABLE(dbus-service,
               AS_HELP_STRING([--enable-dbus-service=args],

src/src.am

@@ -18,12 +18,14 @@ include $(top_srcdir)/src/syncevo/syncevo.am
 src_cppflags += -I$(top_srcdir)/src/syncevo
 include $(top_srcdir)/src/backends/backends.am
 src_cppflags += $(addprefix -I$(top_srcdir)/,$(BACKENDS)) -I$(SYNTHESIS_SUBDIR)
-bin_PROGRAMS += src/syncevolution
 bin_SCRIPTS += src/synccompare
 include $(top_srcdir)/src/templates/templates.am
 else
 src_cppflags += -I$(top_srcdir)/$(SYNTHESIS_SUBDIR_INCLUDES)
 endif
+if COND_CMDLINE
+bin_PROGRAMS += src/syncevolution
+endif
 
 include $(top_srcdir)/src/dbus/dbus.am
 src_cppflags += -I$(top_srcdir)/src/dbus
@@ -182,8 +184,8 @@ distclean-local:
 	rm -rf $(SYNTHESIS_SUBDIR)
 	rm -rf $(CLEAN_CLIENT_SRC)
 
-# Local sync helper executable. Built unconditionally at the moment,
-# thus creating a hard dependency on D-Bus.
+# Local sync helper executable. Depends on D-Bus for internal communication.
+if COND_LOCAL_SYNC
 libexec_PROGRAMS += src/syncevo-local-sync
 src_syncevo_local_sync_SOURCES = \
 	src/syncevo-local-sync.cpp \
@@ -196,7 +198,7 @@ src_syncevo_local_sync_CPPFLAGS = -DHAVE_CONFIG_H -I$(gdbus_dir) $(src_cppflags)
 src_syncevo_local_sync_CXXFLAGS = $(PCRECPP_CFLAGS) $(SYNCEVOLUTION_CXXFLAGS) $(CORE_CXXFLAGS) $(GLIB_CFLAGS) $(DBUS_CFLAGS) $(LIBSOUP_CFLAGS) $(SYNCEVO_WFLAGS)
 src_syncevo_local_sync_LDFLAGS = $(PCRECPP_LIBS) $(CORE_LD_FLAGS) $(LIBSOUP_LIBS)
 src_syncevo_local_sync_DEPENDENCIES = $(top_builddir)/$(gdbus_build_dir)/libgdbussyncevo.la $(EXTRA_LTLIBRARIES) $(CORE_DEP) $(SYNTHESIS_DEP)
-
+endif
 
 # Do the linking here, as with all SyncEvolution executables.
 # Sources are compiled in dbus/server.