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[gtk+] configure.ac: Support multiple GDK backends in one build

commit cacee7e7a380ac9009fc1339a860f563ebe4dc4d
Author: Kristian Høgsberg <krh bitplanet net>
Date:   Mon Jan 3 10:45:37 2011 -0500

    configure.ac: Support multiple GDK backends in one build

 Makefile.am                      |    4 +-
 Makefile.decl                    |   10 +++-
 README.win32                     |    2 +-
 configure.ac                     |  116 ++++++++++++++++++++++----------------
 docs/reference/gtk/building.sgml |   28 +++++++---
 gdk-3.0.pc.in                    |    2 +-
 gdk/Makefile.am                  |    5 +-
 gtk+-3.0-uninstalled.pc.in       |    6 +-
 gtk+-3.0.pc.in                   |    2 +-
 gtk+-unix-print-3.0.pc.in        |    2 +-
 gtk/Makefile.am                  |    2 -
 11 files changed, 107 insertions(+), 72 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 107985a..1063b9f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -71,8 +71,8 @@ gtk+-*-3.0-uninstalled.pc: gtk+-3.0-uninstalled.pc
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = gdk-3.0.pc gtk+-3.0.pc gail-3.0.pc
 
-pkgconfig_DATA += $(patsubst %,gtk+-%-3.0.pc,@gdktarget@)
-pkgconfig_DATA += $(patsubst %,gdk-%-3.0.pc,@gdktarget@)
+pkgconfig_DATA += ${GDK_BACKENDS:%=gtk+-%-3.0.pc}
+pkgconfig_DATA += ${GDK_BACKENDS:%=gdk-%-3.0.pc}
 
 if OS_UNIX
 pkgconfig_DATA += gtk+-unix-print-3.0.pc
diff --git a/Makefile.decl b/Makefile.decl
index 2f6c579..1ecbc61 100644
--- a/Makefile.decl
+++ b/Makefile.decl
@@ -17,9 +17,15 @@ XIDS = 101 102 103 104 105 106 107 197 199 211 223 227 293 307 308 309 310 311 \
   1008 1009 4703 4721 4723 4729 4733 4751 9973 9974 9975 9976 9977 9978 9979 \
   9980 9981 9982 9983 9984 9985 9986 9987 9988 9989 9990 9991 9992 9993 9994 \
   9995 9996 9997 9998 9999
+
+if USE_X11
+SKIP_GDKTARGET = \
+	false
+else
 SKIP_GDKTARGET = \
-	test "$(gdktarget)" != "x11" \
-	&& echo "Gtk+Tests:INFO: Skipping GUI tests for non-X11 target."
+	echo "Gtk+Tests:INFO: Skipping GUI tests for non-X11 target."
+endif
+
 XVFB_START = \
 	${XVFB} -help 2>/dev/null 1>&2 \
 	&& XID=`for id in $(XIDS) ; do test -e /tmp/.X$$id-lock || { echo $$id; exit 0; }; done; exit 1` \
diff --git a/README.win32 b/README.win32
index f7c8ca6..fbbd691 100644
--- a/README.win32
+++ b/README.win32
@@ -85,7 +85,7 @@ LDFLAGS="-L/devel/dist/${ARCH}/${LIBPNG}/lib \
 LIBS=-lintl \
 CFLAGS=-O2 \
 ./configure \
---with-gdktarget=win32 \
+--enable-win32-backend \
 --disable-gdiplus \
 --with-included-immodules \
 --without-libjasper \
diff --git a/configure.ac b/configure.ac
index 522bf69..d163ca2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -255,22 +255,57 @@ AC_ARG_ENABLE(xinput,
                               [support XInput extension if available [default=yes]])],,
               [enable_xinput="yes"])
 
-if test "$platform_win32" = yes; then
-  gdktarget=win32
-else
-  gdktarget=x11
+AC_ARG_ENABLE(x11-backend,
+              [AC_HELP_STRING([--enable-x11-backend],
+                              [enable the X11 gdk backend])],
+			      [backend_set=yes])
+AC_ARG_ENABLE(win32-backend,
+              [AC_HELP_STRING([--enable-win32-backend],
+                              [enable the Win32 gdk backend])],
+			      [backend_set=yes])
+AC_ARG_ENABLE(quartz-backend,
+              [AC_HELP_STRING([--enable-quartz-backend],
+                              [enable the quartz gdk backend])],
+			      [backend_set=yes])
+
+if test -z "$backend_set"; then
+  if test "$platform_win32" = yes; then
+    enable_win32_backend=yes
+  else
+    enable_x11_backend=yes
+  fi
+fi
+
+cairo_backends=
+GDK_BACKENDS=
+
+if test "x$enable_x11_backend" == xyes; then
+  # GDK calls the xlib backend "x11," cairo calls it "xlib." Other
+  # backend names are identical.
+  cairo_backends="$cairo_backends cairo-xlib"
+  GDK_BACKENDS="$GDK_BACKENDS x11"
+  # Pull in gio-unix for GDesktopAppInfo usage, see at least
+  # gdkapplaunchcontext-x11.c
+  GIO_PACKAGE=gio-unix-2.0
 fi
 
-AC_ARG_WITH(gdktarget,
-            AC_HELP_STRING([--with-gdktarget=@<:@x11/win32/quartz@:>@],
-                           [select non-default GDK target]),
-            gdktarget=$with_gdktarget)
+if test "x$enable_win32_backend" == xyes; then
+  cairo_backends="$cairo_backends cairo-win32"
+  GDK_BACKENDS="$GDK_BACKENDS win32"
+  GIO_PACKAGE=gio-2.0
+fi
 
-AC_SUBST(gdktarget)
-case $gdktarget in
-  x11|win32|quartz) ;;
-  *) AC_MSG_ERROR([Invalid target for GDK: use x11, quartz or win32.]);;
-esac
+if test "x$enable_quartz_backend" == xyes; then
+  cairo_backends="$cairo_backends cairo-quartz"
+  GDK_BACKENDS="$GDK_BACKENDS quartz"
+  GIO_PACKAGE=gio-2.0
+fi
+
+AC_SUBST(GDK_BACKENDS)
+
+if test -z "$GDK_BACKENDS"; then
+  AC_MSG_ERROR([No GDK backends selected.])
+fi
 
 if test "x$enable_debug" = "xyes"; then
   test "$cflags_set" = set || CFLAGS="$CFLAGS -g"
@@ -363,18 +398,7 @@ PKG_CHECK_MODULES(BASE_DEPENDENCIES,
    cairo-gobject >= cairo_required_version dnl
    gdk-pixbuf-2.0 >= gdk_pixbuf_required_version])
 
-## In addition to checking that cairo is present, we also need to
-## check that the correct cairo backend is there. E.g. if the GDK
-## target is win32 we need the cairo-win32 backend and so on.
-cairo_backend=$gdktarget
-
-# GDK calls the xlib backend "x11," cairo calls it "xlib." Other
-# backend names are identical.
-if test "x$cairo_backend" = "xx11"; then
-   cairo_backend=xlib
-fi
-PKG_CHECK_MODULES(CAIRO_BACKEND,
-  [cairo-$cairo_backend >= cairo_required_version])
+PKG_CHECK_MODULES(CAIRO_BACKEND, [$cairo_backends])
 
 if test "$os_win32" != yes; then
     # libtool option to control which symbols are exported
@@ -744,11 +768,11 @@ else
 fi
 
 all_immodules="am-et,cedilla,cyrillic-translit"
-if test "$gdktarget" = "win32"; then
+if test "x$enable_win32_backend" == xyes; then
    all_immodules="${all_immodules},ime"
 fi
 all_immodules="${all_immodules},inuktitut,ipa,multipress,thai,ti-er,ti-et,viqr"
-if test "$gdktarget" = "x11"; then
+if test "x$enable_x11_backend" == xyes; then
    all_immodules="${all_immodules},xim"
 fi
 
@@ -842,7 +866,7 @@ GDK_EXTRA_CFLAGS=
 GTK_DEP_PACKAGES_FOR_X=
 GTK_DEP_LIBS_FOR_X=
 
-if test "x$gdktarget" = "xx11"; then
+if test "x$enable_x11_backend" == xyes; then
   X_PACKAGES=fontconfig
 
   #
@@ -1101,14 +1125,15 @@ else
   AM_CONDITIONAL(HAVE_X11R6, false)
 fi
 
-if test "x$gdktarget" = "xwin32"; then
+
+if test "x$enable_win32_backend" == xyes; then
   GDK_EXTRA_LIBS="$GDK_EXTRA_LIBS -lgdi32 -limm32 -lshell32 -lole32 -Wl,-luuid"
   AM_CONDITIONAL(USE_WIN32, true)
 else
   AM_CONDITIONAL(USE_WIN32, false)
 fi
 
-if test "x$gdktarget" = "xquartz"; then
+if test "x$enable_quartz_backend" == xyes; then
   GDK_EXTRA_LIBS="$GDK_EXTRA_LIBS -framework Cocoa"
   AM_CONDITIONAL(USE_QUARTZ, true)
 else
@@ -1117,7 +1142,7 @@ fi
 
 # Check for Pango flags
 
-if test "x$gdktarget" = "xwin32"; then
+if test "x$enable_win32_backend" == xyes; then
 	PANGO_PACKAGES="pangowin32 pangocairo"
 else
 	PANGO_PACKAGES="pango pangocairo"
@@ -1152,12 +1177,7 @@ fi
 CFLAGS="$saved_cflags"
 LDFLAGS="$saved_ldflags"
 
-# Pull in gio-unix for GDesktopAppInfo usage, see at least gdkapplaunchcontext-x11.c
-if test "x$gdktarget" = "xx11"; then
-  GDK_PACKAGES="$PANGO_PACKAGES gio-unix-2.0 $X_PACKAGES gdk-pixbuf-2.0 cairo-$cairo_backend cairo-gobject"
-else
-  GDK_PACKAGES="$PANGO_PACKAGES gio-2.0 gdk-pixbuf-2.0 cairo-$cairo_backend cairo-gobject"
-fi
+GDK_PACKAGES="$PANGO_PACKAGES $GIO_PACKAGE $X_PACKAGES gdk-pixbuf-2.0 $cairo_backends cairo-gobject"
 
 GDK_DEP_LIBS="$GDK_EXTRA_LIBS `$PKG_CONFIG --libs $GDK_PACKAGES`"
 GDK_DEP_CFLAGS="`$PKG_CONFIG --cflags  gthread-2.0 $GDK_PACKAGES` $GDK_EXTRA_CFLAGS"
@@ -1207,7 +1227,7 @@ else
 fi
 
 GTK_PACKAGES="atk cairo cairo-gobject gdk-pixbuf-2.0 gio-2.0"
-if test "x$gdktarget" = "xx11"; then
+if test "x$enable_x11_backend" == xyes; then
   GTK_PACKAGES="$GTK_PACKAGES pangoft2"
 fi
 GTK_EXTRA_LIBS=
@@ -1524,18 +1544,18 @@ _______EOF
 	fi
 ],[
 gdk_windowing=''
-if expr "$gdktarget" : ".*x11.*" > /dev/null ; then
-  gdk_windowing='$gdk_windowing
-#define GDK_WINDOWING_X11'
+if test "x$enable_x11_backend" == xyes; then
+  gdk_windowing="\$gdk_windowing
+#define GDK_WINDOWING_X11"
 fi
-if expr "$gdktarget" : ".*win32.*" > /dev/null ; then
-  gdk_windowing='$gdk_windowing
+if test "x$enable_win32_backend" == xyes; then
+  gdk_windowing="\$gdk_windowing
 #define GDK_NATIVE_WINDOW_POINTER
-#define GDK_WINDOWING_WIN32'
+#define GDK_WINDOWING_WIN32"
 fi
-if expr "$gdktarget" : ".*quartz.*" > /dev/null ; then
-  gdk_windowing='$gdk_windowing
-#define GDK_WINDOWING_QUARTZ'
+if test "x$enable_quartz_backend" == xyes; then
+  gdk_windowing="\$gdk_windowing
+#define GDK_WINDOWING_QUARTZ"
 fi
 ])
 
@@ -1626,4 +1646,4 @@ perf/Makefile
 AC_OUTPUT
 
 echo "configuration:
-        target:             $gdktarget"
+        backends:             $GDK_BACKENDS"
diff --git a/docs/reference/gtk/building.sgml b/docs/reference/gtk/building.sgml
index 9b538d7..c02cf82 100644
--- a/docs/reference/gtk/building.sgml
+++ b/docs/reference/gtk/building.sgml
@@ -360,9 +360,14 @@ How to compile GTK+ itself
           <group>
             <arg>--enable-packagekit</arg>
             <arg>--disable-packagekit</arg>
-          </group>
-          <group>
-            <arg>--with-gdktarget=[x11/win32/quartz]</arg>
+	  </group>
+	  <group>
+            <arg>--enable-x11-backend</arg>
+            <arg>--disable-x11-backend</arg>
+            <arg>--enable-win32-backend</arg>
+            <arg>--disable-win32-backend</arg>
+            <arg>--enable-quartz-backend</arg>
+            <arg>--disable-quartz-backend</arg>
           </group>
           <group>
             <arg>--enable-introspection=[no/auto/yes]</arg>
@@ -545,13 +550,20 @@ How to compile GTK+ itself
       </formalpara>
 
       <formalpara>
-        <title><systemitem>--with-gdktarget</systemitem></title>
+        <title><systemitem>--enable-x11-backend</systemitem>,
+	  <systemitem>--disable-x11-backend</systemitem>,
+	  <systemitem>--enable-win32-backend</systemitem>,
+	  <systemitem>--disable-win32-backend</systemitem>,
+	  <systemitem>--enable-quartz-backend</systemitem>,
+          and <systemitem>--disable-quartz-backend</systemitem></title>
 
         <para>
-          Toggles between the supported backends for GDK.
-          The default is x11, unless the platform is Windows, in which
-          case the default is win32. Other supported backends are
-          the quartz backend for OS X.
+          Enables specific backends for GDK.  If none of these options
+          are given, the x11 backend will be enabled by default,
+          unless the platform is Windows, in which case the default is
+          win32.  If any backend is explicitly enabled or disabled, no
+          other platform will be enabled automatically.  Other
+          supported backends are the quartz backend for OS X.
         </para>
       </formalpara>
       <formalpara>
diff --git a/gdk-3.0.pc.in b/gdk-3.0.pc.in
index 796938d..5c7d27e 100644
--- a/gdk-3.0.pc.in
+++ b/gdk-3.0.pc.in
@@ -2,7 +2,7 @@ prefix= prefix@
 exec_prefix= exec_prefix@
 libdir= libdir@
 includedir= includedir@
-target= gdktarget@
+targets= GDK_BACKENDS@
 
 Name: GDK
 Description: GTK+ Drawing Kit
diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index 4d3a92e..c28a07f 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -8,7 +8,8 @@ INTROSPECTION_COMPILER_ARGS = \
    --includedir=$(srcdir) \
    --includedir=.
 
-SUBDIRS = $(gdktarget) . tests
+SUBDIRS = $(GDK_BACKENDS) . tests
+
 DIST_SUBDIRS = win32 x11 quartz tests
 
 CLEANFILES =
@@ -38,8 +39,6 @@ INCLUDES = 				\
 	$(GTK_DEBUG_FLAGS)		\
 	$(GDK_DEP_CFLAGS)
 
-gtarget=$(gdktarget)
-
 if PLATFORM_WIN32
 no_undefined = -no-undefined
 endif
diff --git a/gtk+-3.0-uninstalled.pc.in b/gtk+-3.0-uninstalled.pc.in
index 238ad6f..dbccc16 100644
--- a/gtk+-3.0-uninstalled.pc.in
+++ b/gtk+-3.0-uninstalled.pc.in
@@ -1,10 +1,10 @@
-target= gdktarget@
+targets= GDK_BACKENDS@
 
 gtk_binary_version= GTK_BINARY_VERSION@
 
 Name: GTK+ Uninstalled
 Description: GTK+ Graphical UI Library (${target} target), Not Installed
 Version: @VERSION@
-Requires: gdk-${target}- GTK_API_VERSION@-uninstalled @GTK_PACKAGES@
-Libs: ${pc_top_builddir}/${pcfiledir}/gtk/libgtk-${target}- GTK_API_VERSION@.la @GTK_EXTRA_LIBS@
+Requires: gdk- GTK_API_VERSION@-uninstalled @GTK_PACKAGES@
+Libs: ${pc_top_builddir}/${pcfiledir}/gtk/libgtk- GTK_API_VERSION@.la @GTK_EXTRA_LIBS@
 Cflags: -I${pc_top_builddir}/${pcfiledir}/@srcdir@ -I${pc_top_builddir}/${pcfiledir} @GTK_EXTRA_CFLAGS@
diff --git a/gtk+-3.0.pc.in b/gtk+-3.0.pc.in
index b11c4a1..cc31882 100644
--- a/gtk+-3.0.pc.in
+++ b/gtk+-3.0.pc.in
@@ -2,7 +2,7 @@ prefix= prefix@
 exec_prefix= exec_prefix@
 libdir= libdir@
 includedir= includedir@
-target= gdktarget@
+targets= GDK_BACKENDS@
 
 gtk_binary_version= GTK_BINARY_VERSION@
 gtk_host= host@
diff --git a/gtk+-unix-print-3.0.pc.in b/gtk+-unix-print-3.0.pc.in
index cbace1a..8c0f323 100644
--- a/gtk+-unix-print-3.0.pc.in
+++ b/gtk+-unix-print-3.0.pc.in
@@ -2,7 +2,7 @@ prefix= prefix@
 exec_prefix= exec_prefix@
 libdir= libdir@
 includedir= includedir@
-target= gdktarget@
+targets= GDK_BACKENDS@
 
 gtk_binary_version= GTK_BINARY_VERSION@
 gtk_host= host@
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index aab506e..bc76c15 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -57,8 +57,6 @@ INCLUDES =						\
 	$(gtk_clipboard_dnd_c_sources_CFLAGS)		\
 	$(INCLUDED_IMMODULE_DEFINE)
 
-gtarget=$(gdktarget)
-
 if PLATFORM_WIN32
 no_undefined = -no-undefined
 endif
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