pipe-loader: wrap pipe_loader_sw_probe_xlib within HAVE_PIPE_LOADER_XLIB

The above function implies using the the xlib winsys, which
has additional library dependencies that should not be forced.

Make the software xlib pipe loader optional thus avoid all
the dependency hell. A user that wishes to use the particular
pipe-loader would need to set the following within configure.ac.

 enable_gallium_xlib_loader=yes

v2:
 - Wrap sw/xlib/xlib_sw_winsys.h to handle compilation on systems
lacking X11 headers. Spotted by Christian Prochaska.

Tested-by: Tom Stellard <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75356
Signed-off-by: Emil Velikov <[email protected]>

3 files changed, 6 insertions, 7 deletions

diff --git a/src/gallium/auxiliary/pipe-loader/Makefile.am b/src/gallium/auxiliary/pipe-loader/Makefile.am
index 232fe40f12e..ccdbea56d7a 100644
--- a/src/gallium/auxiliary/pipe-loader/Makefile.am
+++ b/src/gallium/auxiliary/pipe-loader/Makefile.am
@@ -8,10 +8,6 @@ AM_CPPFLAGS = $(DEFINES) \
 	-I$(top_srcdir)/src/gallium/auxiliary \
 	-I$(top_srcdir)/src/gallium/winsys
 
-if NEED_WINSYS_XLIB
-AM_CPPFLAGS += -DHAVE_WINSYS_XLIB
-endif
-
 noinst_LTLIBRARIES =
 
 if HAVE_LOADER_GALLIUM
diff --git a/src/gallium/auxiliary/pipe-loader/pipe_loader.h b/src/gallium/auxiliary/pipe-loader/pipe_loader.h
index 125086d24ab..a5e49fc2c1a 100644
--- a/src/gallium/auxiliary/pipe-loader/pipe_loader.h
+++ b/src/gallium/auxiliary/pipe-loader/pipe_loader.h
@@ -35,7 +35,7 @@
 
 #include "pipe/p_compiler.h"
 
-#ifdef HAVE_WINSYS_XLIB
+#ifdef HAVE_PIPE_LOADER_XLIB
 #include <X11/Xlib.h>
 #endif
 
@@ -105,7 +105,7 @@ pipe_loader_create_screen(struct pipe_loader_device *dev,
 void
 pipe_loader_release(struct pipe_loader_device **devs, int ndev);
 
-#ifdef HAVE_WINSYS_XLIB
+#ifdef HAVE_PIPE_LOADER_XLIB
 
 /**
  * Initialize Xlib for an associated display.
diff --git a/src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c b/src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c
index ece687bf2f5..35ec37fa2db 100644
--- a/src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c
+++ b/src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c
@@ -31,7 +31,10 @@
 #include "util/u_dl.h"
 #include "sw/dri/dri_sw_winsys.h"
 #include "sw/null/null_sw_winsys.h"
+#ifdef HAVE_PIPE_LOADER_XLIB
+/* Explicitly wrap the header to ease build without X11 headers */
 #include "sw/xlib/xlib_sw_winsys.h"
+#endif
 #include "target-helpers/inline_sw_helper.h"
 #include "state_tracker/drisw_api.h"
 
@@ -49,7 +52,7 @@ static struct sw_winsys *(*backends[])() = {
    null_sw_create
 };
 
-#ifdef HAVE_WINSYS_XLIB
+#ifdef HAVE_PIPE_LOADER_XLIB
 bool
 pipe_loader_sw_probe_xlib(struct pipe_loader_device **devs, Display *display)
 {