build: Allow disabling building of wayland libraries

When cross-compiling it may be useful to build only the wayland-scanner
natively.  This patch makes it possible to disable build of the libraries.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

Makefile.am

@@ -22,9 +22,32 @@ dist_pkgdata_DATA =				\
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA =
 
-lib_LTLIBRARIES = libwayland-server.la libwayland-client.la
+if ENABLE_SCANNER
+wayland_scanner = $(top_builddir)/wayland-scanner
+bin_PROGRAMS = wayland-scanner
+wayland_scanner_SOURCES = src/scanner.c
+wayland_scanner_CFLAGS = $(EXPAT_CFLAGS) $(AM_CFLAGS)
+wayland_scanner_LDADD = $(EXPAT_LIBS) libwayland-util.la
+$(BUILT_SOURCES) : wayland-scanner
+pkgconfig_DATA += src/wayland-scanner.pc
+else
+wayland_scanner = wayland-scanner
+endif
+
+libwayland_util_la_CFLAGS = $(FFI_CFLAGS) $(GCC_CFLAGS)
+libwayland_util_la_SOURCES =			\
+	src/connection.c			\
+	src/wayland-util.c			\
+	src/wayland-util.h			\
+	src/wayland-os.c			\
+	src/wayland-os.h			\
+	src/wayland-private.h
+
 noinst_LTLIBRARIES = libwayland-util.la
 
+if ENABLE_LIBRARIES
+lib_LTLIBRARIES = libwayland-server.la libwayland-client.la
+
 include_HEADERS =				\
 	src/wayland-util.h			\
 	src/wayland-server.h			\
@@ -39,15 +62,6 @@ nodist_include_HEADERS =			\
 	protocol/wayland-server-protocol.h	\
 	protocol/wayland-client-protocol.h
 
-libwayland_util_la_CFLAGS = $(FFI_CFLAGS) $(GCC_CFLAGS)
-libwayland_util_la_SOURCES =			\
-	src/connection.c			\
-	src/wayland-util.c			\
-	src/wayland-util.h			\
-	src/wayland-os.c			\
-	src/wayland-os.h			\
-	src/wayland-private.h
-
 libwayland_server_la_CFLAGS = $(FFI_CFLAGS) $(GCC_CFLAGS) -pthread
 libwayland_server_la_LIBADD = $(FFI_LIBS) libwayland-util.la -lrt -lm
 libwayland_server_la_LDFLAGS = -version-info 1:0:1
@@ -72,18 +86,6 @@ nodist_libwayland_client_la_SOURCES =		\
 
 pkgconfig_DATA += src/wayland-client.pc src/wayland-server.pc
 
-if ENABLE_SCANNER
-wayland_scanner = $(top_builddir)/wayland-scanner
-bin_PROGRAMS = wayland-scanner
-wayland_scanner_SOURCES = src/scanner.c
-wayland_scanner_CFLAGS = $(EXPAT_CFLAGS) $(AM_CFLAGS)
-wayland_scanner_LDADD = $(EXPAT_LIBS) libwayland-util.la
-$(BUILT_SOURCES) : wayland-scanner
-pkgconfig_DATA += src/wayland-scanner.pc
-else
-wayland_scanner = wayland-scanner
-endif
-
 protocol/%-protocol.c : $(top_srcdir)/protocol/%.xml
 	$(AM_V_GEN)$(MKDIR_P) $(dir $@) && $(wayland_scanner) code < $< > $@
 
@@ -224,3 +226,4 @@ os_wrappers_test_LDADD = libtest-runner.la
 
 exec_fd_leak_checker_SOURCES = tests/exec-fd-leak-checker.c
 exec_fd_leak_checker_LDADD = libtest-runner.la
+endif

configure.ac

@@ -54,16 +54,11 @@ AC_SUBST(GCC_CFLAGS)
 
 AC_CHECK_FUNCS([accept4 mkostemp posix_fallocate])
 
-AC_CHECK_DECL(SFD_CLOEXEC,[],
+AC_ARG_ENABLE([libraries],
-	      [AC_MSG_ERROR("SFD_CLOEXEC is needed to compile wayland")],
+	      [AC_HELP_STRING([--disable-libraries],
-	      [[#include <sys/signalfd.h>]])
+			      [Disable compilation of wayland libraries])],
-AC_CHECK_DECL(TFD_CLOEXEC,[],
+	      [],
-	      [AC_MSG_ERROR("TFD_CLOEXEC is needed to compile wayland")],
+	      [enable_libraries=yes])
-	      [[#include <sys/timerfd.h>]])
-AC_CHECK_DECL(CLOCK_MONOTONIC,[],
-	      [AC_MSG_ERROR("CLOCK_MONOTONIC is needed to compile wayland")],
-	      [[#include <time.h>]])
-AC_CHECK_HEADERS([execinfo.h])
 
 AC_ARG_ENABLE([scanner],
               [AC_HELP_STRING([--disable-scanner],
@@ -79,11 +74,26 @@ AC_ARG_ENABLE([documentation],
 
 AM_CONDITIONAL(ENABLE_SCANNER, test "x$enable_scanner" = xyes)
 
+AM_CONDITIONAL(ENABLE_LIBRARIES, test "x$enable_libraries" = xyes)
+
 AC_ARG_WITH(icondir, [  --with-icondir=<dir>    Look for cursor icons here],
 		     [  ICONDIR=$withval],
 		     [  ICONDIR=${datadir}/icons])
 AC_SUBST([ICONDIR])
 
+if test "x$enable_libraries" = "xyes"; then
+	AC_CHECK_DECL(SFD_CLOEXEC,[],
+		      [AC_MSG_ERROR("SFD_CLOEXEC is needed to compile wayland libraries")],
+		      [[#include <sys/signalfd.h>]])
+	AC_CHECK_DECL(TFD_CLOEXEC,[],
+		      [AC_MSG_ERROR("TFD_CLOEXEC is needed to compile wayland libraries")],
+		      [[#include <sys/timerfd.h>]])
+	AC_CHECK_DECL(CLOCK_MONOTONIC,[],
+		      [AC_MSG_ERROR("CLOCK_MONOTONIC is needed to compile wayland libraries")],
+		      [[#include <time.h>]])
+	AC_CHECK_HEADERS([execinfo.h])
+fi
+
 if test "x$enable_scanner" = "xyes"; then
 	PKG_CHECK_MODULES(EXPAT, [expat], [],
 		[AC_CHECK_HEADERS(expat.h, [],