configure.ac: Make libdrm optional in weston-launch

If libdrm is available, weston-launch and launcer-util.c will support
getting the drm device and setting and dropping drm master, otherwise
we'll only support getting input devices.

configure.ac

@@ -102,6 +102,8 @@ if test x$enable_xwayland = xyes; then
   fi
 fi
 
+PKG_CHECK_MODULES(LIBDRM, [libdrm],
+                  [AC_DEFINE(HAVE_LIBDRM, 1, [Define if libdrm is available]) have_libdrm=yes], have_libdrm=no)
 
 AC_ARG_ENABLE(x11-compositor, [  --enable-x11-compositor],,
 	      enable_x11_compositor=yes)
@@ -145,9 +147,6 @@ AM_CONDITIONAL(ENABLE_DRM_COMPOSITOR, test x$enable_drm_compositor = xyes -a x$e
 if test x$enable_drm_compositor = xyes -a x$enable_egl = xyes; then
   AC_DEFINE([BUILD_DRM_COMPOSITOR], [1], [Build the DRM compositor])
   PKG_CHECK_MODULES(DRM_COMPOSITOR, [libudev >= 136 libdrm >= 2.4.30 gbm mtdev >= 1.1.0])
-
-  # For libdrm usage in launcher-util.c
-  COMPOSITOR_MODULES="$COMPOSITOR_MODULES libdrm"
 fi
 
 PKG_CHECK_MODULES(COMPOSITOR, [$COMPOSITOR_MODULES])
@@ -332,13 +331,12 @@ AS_IF([test "x$have_systemd_login_209" = "xyes"],
 AC_ARG_ENABLE(weston-launch, [  --enable-weston-launch],, enable_weston_launch=yes)
 AM_CONDITIONAL(BUILD_WESTON_LAUNCH, test x$enable_weston_launch == xyes)
 if test x$enable_weston_launch == xyes; then
-  PKG_CHECK_MODULES(WESTON_LAUNCH, [libdrm])
-
   AC_CHECK_LIB([pam], [pam_open_session], [have_pam=yes], [have_pam=no])
   if test x$have_pam == xno; then
     AC_ERROR([weston-launch requires pam])
   fi
-  WESTON_LAUNCH_LIBS="$WESTON_LAUNCH_LIBS -lpam"
+  PAM_LIBS=-lpam
+  AC_SUBST(PAM_LIBS)
 fi
 
 if test x$enable_egl = xyes; then

src/Makefile.am

@@ -80,10 +80,13 @@ DIST_SUBDIRS = xwayland
 if BUILD_WESTON_LAUNCH
 weston_launch = weston-launch
 weston_launch_SOURCES = weston-launch.c weston-launch.h
-weston_launch_CFLAGS= $(GCC_CFLAGS)
-weston_launch_CPPFLAGS = $(WESTON_LAUNCH_CFLAGS) $(SYSTEMD_LOGIN_CFLAGS) \
-		 -DBINDIR='"$(bindir)"'
-weston_launch_LDADD = $(WESTON_LAUNCH_LIBS) $(SYSTEMD_LOGIN_LIBS)
+weston_launch_CPPFLAGS = -DBINDIR='"$(bindir)"'
+weston_launch_CFLAGS=				\
+	$(GCC_CFLAGS)				\
+	$(PAM_CFLAGS)				\
+	$(SYSTEMD_LOGIN_CFLAGS)			\
+	$(LIBDRM_CFLAGS)
+weston_launch_LDADD = $(PAM_LIBS) $(SYSTEMD_LOGIN_LIBS) $(LIBDRM_LIBS)
 
 if ENABLE_SETUID_INSTALL
 install-exec-hook:
@@ -206,11 +209,13 @@ rpi_backend_la_LDFLAGS = -module -avoid-version
 rpi_backend_la_LIBADD = $(COMPOSITOR_LIBS)	\
 	$(RPI_COMPOSITOR_LIBS)			\
 	$(RPI_BCM_HOST_LIBS)			\
+	$(LIBDRM_LIBS)				\
 	../shared/libshared.la
 rpi_backend_la_CFLAGS =				\
 	$(GCC_CFLAGS)				\
 	$(COMPOSITOR_CFLAGS)			\
 	$(RPI_COMPOSITOR_CFLAGS)		\
+	$(LIBDRM_CFLAGS)				\
 	$(RPI_BCM_HOST_CFLAGS)
 rpi_backend_la_SOURCES =			\
 	compositor-rpi.c			\
@@ -247,11 +252,13 @@ fbdev_backend_la_LDFLAGS = -module -avoid-version
 fbdev_backend_la_LIBADD = \
 	$(COMPOSITOR_LIBS) \
 	$(FBDEV_COMPOSITOR_LIBS) \
+	$(LIBDRM_LIBS) \
 	../shared/libshared.la
 fbdev_backend_la_CFLAGS = \
 	$(COMPOSITOR_CFLAGS) \
 	$(EGL_CFLAGS) \
 	$(FBDEV_COMPOSITOR_CFLAGS) \
+	$(LIBDRM_CFLAGS) \
 	$(PIXMAN_CFLAGS) \
 	$(GCC_CFLAGS)
 fbdev_backend_la_SOURCES = \

src/launcher-util.c

@@ -40,10 +40,6 @@
 #include <linux/kd.h>
 #include <linux/major.h>
 
-#ifdef BUILD_DRM_COMPOSITOR
-#include <xf86drm.h>
-#endif
-
 #include "compositor.h"
 #include "launcher-util.h"
 #include "logind-util.h"
@@ -55,43 +51,55 @@
 #define KDSKBMUTE	0x4B51
 #endif
 
-union cmsg_data { unsigned char b[4]; int fd; };
+#ifdef HAVE_LIBDRM
 
-struct weston_launcher {
-	struct weston_logind *logind;
-	struct weston_compositor *compositor;
-	int fd;
-	struct wl_event_source *source;
+#include <xf86drm.h>
 
-	int kb_mode, tty, drm_fd;
-	struct wl_event_source *vt_source;
-};
-
-#ifdef BUILD_DRM_COMPOSITOR
-static int
-drm_drop_master(int drm_fd)
-{
-	return drmDropMaster(drm_fd);
-}
-static int
-drm_set_master(int drm_fd)
-{
-	return drmSetMaster(drm_fd);
-}
-static int
-drm_is_master(int drm_fd)
+static inline int
+is_drm_master(int drm_fd)
 {
 	drm_magic_t magic;
 
 	return drmGetMagic(drm_fd, &magic) == 0 &&
 		drmAuthMagic(drm_fd, magic) == 0;
 }
+
 #else
-static int drm_drop_master(int drm_fd) {return 0;}
-static int drm_set_master(int drm_fd) {return 0;}
-static int drm_is_master(int drm_fd) {return 1;}
+
+static inline int
+drmDropMaster(int drm_fd)
+{
+	return 0;
+}
+
+static inline int
+drmSetMaster(int drm_fd)
+{
+	return 0;
+}
+
+static inline int
+is_drm_master(int drm_fd)
+{
+	return 0;
+}
+
 #endif
 
+
+union cmsg_data { unsigned char b[4]; int fd; };
+
+struct weston_launcher {
+	struct weston_compositor *compositor;
+	struct weston_logind *logind;
+	struct wl_event_loop *loop;
+	int fd;
+	struct wl_event_source *source;
+
+	int kb_mode, tty, drm_fd;
+	struct wl_event_source *vt_source;
+};
+
 int
 weston_launcher_open(struct weston_launcher *launcher,
 		     const char *path, int flags)
@@ -121,7 +129,7 @@ weston_launcher_open(struct weston_launcher *launcher,
 
 		if (major(s.st_rdev) == DRM_MAJOR) {
 			launcher->drm_fd = fd;
-			if (!drm_is_master(fd)) {
+			if (!is_drm_master(fd)) {
 				weston_log("drm fd not master\n");
 				close(fd);
 				return -1;
@@ -205,7 +213,7 @@ weston_launcher_restore(struct weston_launcher *launcher)
 	/* We have to drop master before we switch the VT back in
 	 * VT_AUTO, so we don't risk switching to a VT with another
 	 * display server, that will then fail to set drm master. */
-	drm_drop_master(launcher->drm_fd);
+	drmDropMaster(launcher->drm_fd);
 
 	mode.mode = VT_AUTO;
 	if (ioctl(launcher->tty, VT_SETMODE, &mode) < 0)
@@ -259,11 +267,11 @@ vt_handler(int signal_number, void *data)
 	if (compositor->session_active) {
 		compositor->session_active = 0;
 		wl_signal_emit(&compositor->session_signal, compositor);
-		drm_drop_master(launcher->drm_fd);
+		drmDropMaster(launcher->drm_fd);
 		ioctl(launcher->tty, VT_RELDISP, 1);
 	} else {
 		ioctl(launcher->tty, VT_RELDISP, VT_ACKACQ);
-		drm_set_master(launcher->drm_fd);
+		drmSetMaster(launcher->drm_fd);
 		compositor->session_active = 1;
 		wl_signal_emit(&compositor->session_signal, compositor);
 	}

src/weston-launch.c

@@ -50,8 +50,6 @@
 #include <grp.h>
 #include <security/pam_appl.h>
 
-#include <xf86drm.h>
-
 #ifdef HAVE_SYSTEMD_LOGIN
 #include <systemd/sd-login.h>
 #endif
@@ -70,6 +68,26 @@
 
 #define MAX_ARGV_SIZE 256
 
+#ifdef HAVE_LIBDRM
+
+#include <xf86drm.h>
+
+#else
+
+static inline int
+drmDropMaster(int drm_fd)
+{
+	return 0;
+}
+
+static inline int
+drmSetMaster(int drm_fd)
+{
+	return 0;
+}
+
+#endif
+
 struct weston_launch {
 	struct pam_conv pc;
 	pam_handle_t *ph;

tests/Makefile.am

@@ -112,6 +112,7 @@ subsurface_weston_SOURCES = subsurface-test.c
 subsurface_weston_LDADD = libtest-client.la
 
 xwayland_weston_SOURCES = xwayland-test.c
+xwayland_weston_CFLAGS = $(GCC_CFLAGS) $(XWAYLAND_TEST_CFLAGS)
 xwayland_weston_LDADD = libtest-client.la $(XWAYLAND_TEST_LIBS)
 
 if ENABLE_XWAYLAND_TEST