[libgda/LIBGDA_5.2] valac detection improvements

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 522325deaef80224b0d66f78e1b842fb182a84af
Author: Daniel Espinosa <esodan gmail com>
Date:   Sun Sep 30 10:19:53 2018 -0500

    valac detection improvements
    
    Now using AC_PATH_PROG to detect Vala's compiler, so
    any new version and default one, will be detected and
    used if --enable-vala is used

 configure.ac | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f7c09888c..c99897e89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -512,15 +512,23 @@ AC_ARG_ENABLE([gi-system-install],
     [enable_gi_system_install=$enableval],[enable_gi_system_install=yes])
 AM_CONDITIONAL(ENABLE_GI_SYSTEM_INSTALL, [test x"$enable_gi_system_install" = "xyes"])
 
+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
+
 dnl ******************************
 dnl Check for Vala Compiler
 dnl ******************************
-AC_ARG_VAR(VALA_API_VERSION,[Vala API version to generate bingdings and compile against. Install versioned 
bidings.])
 
-if test "x$enable_gda_gi" != "xyes" -a "x$enable_gdaui_gi" = "xyes"
+AC_PATH_PROG([VALAC], [valac], [no])
+
+AC_PATH_PROG(VAPIGEN, [vapigen], [no])
+if test "x$VAPIGEN" = "xno"
 then
-       AC_MSG_ERROR([GObject Introspection for GDA-UI is requested but GObject Introspection for GDA is 
disabled. Use --enable-gda-gi])
+       enable_vala_ext = "no"
 fi
+AM_CONDITIONAL(ENABLE_VAPIGEN, test "x$VAPIGEN" != "xno")
 
 if test "x$enable_gda_gi" != "xyes" -a "x$enable_vala" = "xyes"
 then
@@ -540,19 +548,15 @@ AC_ARG_ENABLE([vala-extensions],
     AS_HELP_STRING([--enable-vala-extensions[=@<:@no/yes@:>@]], [Enable utility GObject based extensions 
written in Vala [default=no]]),
     [enable_vala_ext=$enableval],[enable_vala_ext=no])
 
-if test "x$enable_vala" != "xyes" -a "x$enable_vala_ext" = "xyes"
+if test "x$enable_vala" = "xyes" -a "x$VALAC" = "xno"
 then
-       AC_MSG_ERROR([Vala Extensions (Utility GObject clases written in Vala) is requested but Vala Bindings 
is disable. Use --enable-vala])
+       AC_MSG_ERROR([Vala Bindigs are requested but Vala's compiler is not found])
 fi
 
-AM_PROG_VALAC([0.30.0])
-AC_PATH_PROG(VAPIGEN, [vapigen], [no])
-vala_api="No Vala bindings will be generated"
-if test "x$VAPIGEN" = "xno"
+if test "x$enable_vala" != "xyes" -a "x$enable_vala_ext" = "xyes" -a "x$found_valac" != "xno"
 then
-       enable_vala_ext = "no"
+       AC_MSG_ERROR([Vala Extensions (Utility GObject clases written in Vala) is requested but Vala Bindings 
is disable. Use --enable-vala])
 fi
-AM_CONDITIONAL(ENABLE_VAPIGEN, test "x$VAPIGEN" != "xno")
 
 dnl Check for libgee
 GEE_REQUIRED="0.8.0"
@@ -1047,8 +1051,7 @@ 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$enable_gtk_doc != xno; then echo yes; else echo no; fi`"
 echo "   Building Help (GdaBrowser): `if test x$with_gdu != xno; then echo yes; else echo no; fi`"
-echo "   Building GDA Vala Bindings (--enable-vala): `if test x$vapigen_pkg_found != xyes; then echo no; 
else echo yes; fi`"
-echo "     Vala API version to use: $vala_api"
+echo "   Building GDA Vala Bindings (--enable-vala): `if test x$enable_vala != xyes; then echo no; else echo 
yes; fi`"
 echo "   Building GDA-UI Vala Bindings: `if test x$enable_gdaui_vala != xyes; then echo no; else echo yes; 
fi`"
 echo "   Building Vala Extensions: `if test x$enable_vala_ext != xno; then echo yes; else echo no; fi`"
 echo "   Building Vala Documentation: `if test x$enable_vala_doc != xno; then echo yes; else echo no; fi`"