[libgda] Autotools: honor disabling experimental features

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 421fd31c757e6b0788a8687af31780b3e951e69c
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Apr 4 17:46:15 2019 -0600

    Autotools: honor disabling experimental features

 configure.ac      | 57 ++++++++++++++++++++++++++++++++++++++++---------------
 doc/C/Makefile.am |  7 +++++--
 2 files changed, 47 insertions(+), 17 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c32589951..0352fe3f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -140,17 +140,6 @@ LT_PREREQ([2.2.6])
 LT_INIT([disable-static])
 AC_PROG_MAKE_SET
 
-dnl -- Initialize help system
-AC_ARG_WITH(help,
-AS_HELP_STRING([--with-help], [Enable building help (GdaBrowser)]),
-       [with_gdu=$withval]
-       ,with_gdu=yes)
-if test x$with_gdu != xno; then
-   YELP_HELP_INIT
-   AC_DEFINE(HAVE_GDU, [1], [Help (GdaBrowser documentation) is built])
-fi
-AM_CONDITIONAL(HAVE_GDU, test x$with_gdu != xno)
-
 dnl ******************************
 dnl glib utilities
 dnl ******************************
@@ -205,10 +194,17 @@ have_goocanvas=no
 have_graphviz=no
 have_sourceview=no
 have_glade=no
+AC_ARG_ENABLE([experimental],
+       AS_HELP_STRING([--enable-experimental], [Enable experimental features (GTK+ widgets, additional 
interfaces)]),
+       [enable_experimental=$enableval],[enable_experimental=no])
+
 AC_ARG_WITH(ui,
        AS_HELP_STRING([--with-ui], [Enable GTK+ extension and tools]),
        ,with_ui=auto)
 
+if test x"$enable_experimental" = "xyes"
+then
+AC_MSG_NOTICE([Enable Experimental Features])
 if test "$with_ui" = "auto" -o "$with_ui" = "yes"
 then
        GTK_MODULES="gtk+-3.0 >= 3.12.0"
@@ -221,7 +217,28 @@ then
                fi
                have_ui=no])
 fi
+fi
 AM_CONDITIONAL(HAVE_UI, test x"$have_ui" = "xyes")
+
+dnl -- Initialize help system
+with_gdu=auto
+AC_ARG_WITH(help,
+AS_HELP_STRING([--with-help], [Enable building help (GdaBrowser)]),
+       [with_gdu=$withval]
+       ,with_gdu=auto)
+
+if test x"$enable_experimental" = "xyes"
+then
+
+if test x$with_gdu != xno -a "$have_ui" ="xyes"
+then
+   YELP_HELP_INIT
+   AC_DEFINE(HAVE_GDU, [1], [Help (GdaBrowser documentation) is built])
+   with_gdu=yes
+fi
+fi
+AM_CONDITIONAL(HAVE_GDU, test x$with_gdu = xyes)
+
 if test "x$GTK_CFLAGS" != "x"
 then
        GTK_CFLAGS="$GTK_CFLAGS -DHAVE_GTK_CLASSES"
@@ -533,6 +550,9 @@ AC_ARG_ENABLE([gdaui-gi],
     AS_HELP_STRING([--enable-gdaui-gi[=@<:@nauto/yes/no@:>@]], [Enable GObject Introspection for libgda-ui 
[default=yes]]),
     [enable_gdaui_gi=$enableval],[enable_gdaui_gi=auto])
 
+enable_gdaui_gi=no
+if test x"$enable_experimental" = "xyes"
+then
 if test "x$enable_gdaui_gi" != "xno" -a "x$enable_gda_gi" = "xyes"
 then
        enable_gdaui_gi="yes"
@@ -545,12 +565,12 @@ then
        AC_MSG_ERROR([Introspection for Libgda UI is requested but no GTK+ is available])
 fi
 
-AM_CONDITIONAL(ENABLE_GDAUI_GI, [test "$enable_gdaui_gi" = "yes"])
-
 if test "x$enable_gda_gi" != "xyes" -a "x$enable_gdaui_gi" = "xyes"
 then
        AC_MSG_ERROR([GObject Introspection for GDA-UI is requested but GObject Introspection for GDA is 
disabled. Use --enable-gda-gi])
 fi
+fi
+AM_CONDITIONAL(ENABLE_GDAUI_GI, [test "$enable_gdaui_gi" = "yes"])
 
 dnl ******************************
 dnl Check for Vala Compiler
@@ -567,6 +587,7 @@ if test "x$VAPIGEN" != "xno"; then
     enable_vapigen="yes"
 fi
 
+enable_vala_bindings=no
 AC_ARG_ENABLE([gda-vala],
     AS_HELP_STRING([--enable-gda-vala[=@<:@auto/yes/no@:>@]], [Enable Vala bindings generation 
[default=auto]]),
     [enable_vala_bindings=$enableval],[enable_vala_bindings=auto])
@@ -581,10 +602,15 @@ enable_gdaui_vala="auto"
 AC_ARG_ENABLE([gdaui-vala],
     AS_HELP_STRING([--enable-gdaui-vala[=@<:@auto/yes/no@:>@]], [Enable Vala bindings for GDA-UI 
[default=auto]]),
     [enable_gdaui_vala=$enableval],[enable_gdaui_vala=auto])
+
+if test x"$enable_experimental" = "xyes"
+then
+
 if test "x$enable_vapigen" = "xyes" -a "x$enable_gdaui_vala" != "xno" -a "x$enable_vala_bindings" = "xyes"
 then
        enable_gdaui_vala="yes"
 fi
+fi
 AM_CONDITIONAL(ENABLE_GDAUI_VALA, test "x$enable_gdaui_vala" = "xyes")
 
 
@@ -1079,6 +1105,7 @@ AC_OUTPUT
 dnl Print configuration summary
 echo ""
 echo " Configuration summary for version $GDA_VERSION"
+echo "   Enable Experimental Features = $enable_experimental"
 echo "   Installation prefix = $prefix"
 echo "   Building GTK+ UI extension: `if test x$have_ui != xno; then echo yes; else echo no; fi`"
 echo "   Installing Glade GTK+ UI extension catalog: `if test x$have_glade != xno; then echo yes; else echo 
no; fi`"
@@ -1087,7 +1114,7 @@ echo "   Building libgda GObject Introspection: `if test x$enable_gda_gi = xyes;
 echo "   Building libgda-ui GObject Introspection: `if test x$enable_gdaui_gi != xno; then echo yes; else 
echo no; fi`"
 echo "   Building Gtk-Doc: `if test x$enable_gtk_doc != xno; then echo yes; else echo no; fi`"
 echo "   Building Examples: `if test x$enable_examples = xyes; then echo yes; else echo no; fi`"
-echo "   Building Help (GdaBrowser): `if test x$with_gdu != xno; then echo yes; else echo no; fi`"
+echo "   Building Help (GdaBrowser): `if test x$with_gdu = xyes; then echo yes; else echo no; fi`"
 echo "   Building GDA Vala Bindings: `if test x$enable_vala_bindings != xyes; then echo no; else echo yes; 
fi`"
 echo "   Building GDA-UI Vala Bindings: `if test "x$enable_gdaui_vala" = "xyes"; then echo yes; else echo 
no; fi`"
 echo "   Building Vala Documentation:"
@@ -1111,4 +1138,4 @@ if test x"$br_cv_binreloc" != "xyes" -a x"$platform_win32" != "xyes"
 then
        echo "   Binreloc support is disabled: Libgda will not be relocatable. To enable binreloc support 
re-run with --enable-binreloc (see http://autopackage.org/docs/binreloc for more information)"
 fi
-echo ""
\ No newline at end of file
+echo ""
diff --git a/doc/C/Makefile.am b/doc/C/Makefile.am
index b9fe6f8da..d4d2ea59e 100644
--- a/doc/C/Makefile.am
+++ b/doc/C/Makefile.am
@@ -1,3 +1,6 @@
 SUBDIRS=\
-       libgda \
-       libgdaui
\ No newline at end of file
+       libgda
+
+if HAVE_UI
+SUBDIRS += libgdaui
+endif