configure: enable the gallium loader only when needed

With the gallium megadrivers we've converted most ST to optionally
use either statically linked in or shared pipe-drivers.

The hardcoded switch forgot to conditionally enable the build of the
shared pipe-drivers which resulted in them being constantly build.

Cc: "10.3" <mesa-stable@lists.freedesktop.org>
Cc: James Ausmus <james.ausmus@intel.com>
Reported-by: James Ausmus <james.ausmus@intel.com>
Tested-by: James Ausmus <james.ausmus@intel.com>
Bugzilla: https://code.google.com/p/chromium/issues/detail?id=412089
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

configure.ac

@@ -823,6 +823,11 @@ fi
 
 AM_CONDITIONAL(HAVE_SHARED_GLAPI, test "x$enable_shared_glapi" = xyes)
 
+# Build the pipe-drivers as separate libraries/modules.
+# Do not touch this unless you know what you are doing.
+# XXX: Expose via configure option ?
+enable_shared_pipe_drivers=no
+
 dnl
 dnl Driver specific build directories
 dnl
@@ -843,7 +848,7 @@ esac
 if test "x$enable_dri" = xyes; then
     GALLIUM_WINSYS_DIRS="$GALLIUM_WINSYS_DIRS sw/dri"
     GALLIUM_STATE_TRACKERS_DIRS="dri $GALLIUM_STATE_TRACKERS_DIRS"
-    enable_gallium_loader=yes
+    enable_gallium_loader="$enable_shared_pipe_drivers"
 fi
 
 if test "x$enable_gallium_osmesa" = xyes; then
@@ -1318,7 +1323,8 @@ if test "x$enable_gallium_egl" = xyes; then
 
     GALLIUM_STATE_TRACKERS_DIRS="egl $GALLIUM_STATE_TRACKERS_DIRS"
     GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS egl-static"
-#    enable_gallium_loader=yes
+# XXX: Uncomment once converted to use static/shared pipe-drivers
+#    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_GALLIUM_EGL, test "x$enable_gallium_egl" = xyes)
 
@@ -1347,7 +1353,7 @@ if test "x$enable_gallium_gbm" = xyes; then
 
     GALLIUM_STATE_TRACKERS_DIRS="gbm $GALLIUM_STATE_TRACKERS_DIRS"
     GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS gbm"
-    enable_gallium_loader=yes
+    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_GALLIUM_GBM, test "x$enable_gallium_gbm" = xyes)
 
@@ -1364,7 +1370,7 @@ if test "x$enable_xa" = xyes; then
           Example: ./configure --enable-xa --with-gallium-drivers=svga...])
     fi
     GALLIUM_STATE_TRACKERS_DIRS="xa $GALLIUM_STATE_TRACKERS_DIRS"
-    enable_gallium_loader=yes
+    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_ST_XA, test "x$enable_xa" = xyes)
 
@@ -1412,7 +1418,7 @@ fi
 if test "x$enable_xvmc" = xyes; then
     PKG_CHECK_MODULES([XVMC], [xvmc >= $XVMC_REQUIRED x11-xcb xcb xcb-dri2 >= $XCBDRI2_REQUIRED])
     GALLIUM_STATE_TRACKERS_DIRS="$GALLIUM_STATE_TRACKERS_DIRS xvmc"
-    enable_gallium_loader=yes
+    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_ST_XVMC, test "x$enable_xvmc" = xyes)
 
@@ -1420,14 +1426,14 @@ if test "x$enable_vdpau" = xyes; then
     PKG_CHECK_MODULES([VDPAU], [vdpau >= $VDPAU_REQUIRED x11-xcb xcb xcb-dri2 >= $XCBDRI2_REQUIRED],
                       [VDPAU_LIBS="`$PKG_CONFIG --libs x11-xcb xcb xcb-dri2`"])
     GALLIUM_STATE_TRACKERS_DIRS="$GALLIUM_STATE_TRACKERS_DIRS vdpau"
-    enable_gallium_loader=yes
+    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_ST_VDPAU, test "x$enable_vdpau" = xyes)
 
 if test "x$enable_omx" = xyes; then
     PKG_CHECK_MODULES([OMX], [libomxil-bellagio >= $LIBOMXIL_BELLAGIO_REQUIRED x11-xcb xcb xcb-dri2 >= $XCBDRI2_REQUIRED])
     GALLIUM_STATE_TRACKERS_DIRS="$GALLIUM_STATE_TRACKERS_DIRS omx"
-    enable_gallium_loader=yes
+    enable_gallium_loader=$enable_shared_pipe_drivers
 fi
 AM_CONDITIONAL(HAVE_ST_OMX, test "x$enable_omx" = xyes)
 
@@ -1479,6 +1485,7 @@ if test "x$enable_opencl" = xyes; then
 
     GALLIUM_STATE_TRACKERS_DIRS="$GALLIUM_STATE_TRACKERS_DIRS clover"
     GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS opencl"
+    # XXX: Use $enable_shared_pipe_drivers once converted to use static/shared pipe-drivers
     enable_gallium_loader=yes
 
     if test "x$enable_opencl_icd" = xyes; then
@@ -1779,6 +1786,7 @@ dnl
 dnl Gallium Tests
 dnl
 if test "x$enable_gallium_tests" = xyes; then
+    # XXX: Use $enable_shared_pipe_drivers once converted to use static/shared pipe-drivers
     enable_gallium_loader=yes
 fi
 AM_CONDITIONAL(HAVE_GALLIUM_TESTS, test "x$enable_gallium_tests" = xyes)
@@ -2067,9 +2075,7 @@ AM_CONDITIONAL(NEED_GALLIUM_SOFTPIPE_DRIVER, test "x$HAVE_GALLIUM_SVGA" = xyes -
 AM_CONDITIONAL(NEED_GALLIUM_LLVMPIPE_DRIVER, test "x$HAVE_GALLIUM_SOFTPIPE" = xyes \
                                                   && test "x$MESA_LLVM" = x1)
 
-# Enable static gallium targets for now.
-# Do not touch this unless you know what you are doing.
-AM_CONDITIONAL(HAVE_GALLIUM_STATIC_TARGETS, test "xyes" = xyes)
+AM_CONDITIONAL(HAVE_GALLIUM_STATIC_TARGETS, test "x$enable_shared_pipe_drivers" = xno)
 
 # NOTE: anything using xcb or other client side libs ends up in separate
 #       _CLIENT variables.  The pipe loader is built in two variants,