add configure option for pyvips8

it tests for pygobject as well

ChangeLog

@@ -9,6 +9,7 @@
 - support python3.4 and python2.7 in new python binding
 - vips_gaussmat() and vips_logmat() are now int by default, to match
   vips_conv(), and use @precision, not @integer
+- added --disable-pyvips8 switch to turn off new py binding
 
 25/7/14 started 7.41.0
 - start working on --disable-deprecated

Makefile.am

@@ -20,7 +20,7 @@ P_DIST_DIR = swig
 endif
 
 # turn on vips8 Python if we can 
-if HAVE_PYTHON
+if ENABLE_PYVIPS8
 P8_COMPILE_DIR = python
 P8_DIST_DIR =
 else
@@ -28,6 +28,7 @@ P8_COMPILE_DIR =
 P8_DIST_DIR = python
 endif
 
+# turn docs on or off
 if ENABLE_DOCS
 D_DIST_DIR = 
 D_BUILD_DIR = doc

TODO

@@ -1,11 +1,5 @@
 - tests have stopped working with python2?
 
-- configure should check for pygobject too
-
-	PKG_CHECK_MODULES(PYTHON, [pygobject-3.0 >= $PYGOBJECT_REQUIRED])
-
-  have separate conditionals for old py and new py
-
 - use vips_resize() in vipsthumbnail?
 
   should the sharpening filter be selectable?

configure.ac

@@ -664,12 +664,35 @@ if test x"$with_pangoft2" != "xno"; then
   PKG_CHECK_MODULES(PANGOFT2, pangoft2,
     [AC_DEFINE(HAVE_PANGOFT2,1,[define if you have pangoft2 installed.])
      with_pangoft2=yes
-     PACKAGES_USED="$PACKAGES_USED pangoft2"],
+     PACKAGES_USED="$PACKAGES_USED pangoft2"
+    ],
     [AC_MSG_WARN([pangoft2 not found; disabling pangoft2 support])
      with_pangoft2=no
     ])
 fi
 
+# install vips8 python
+AC_ARG_ENABLE([pyvips8], 
+  AS_HELP_STRING([--enable-pyvips8], 
+		 [install vips8 Python overrides (default: install)]))
+
+if test x"$enable_pyvips8" != "xno"; then
+  PKG_CHECK_MODULES(PYGOBJECT, [pygobject-3.0 >= 3.1.0],
+    [pyoverridesdir="\$(pyexecdir)/gi/overrides"
+     AC_SUBST(pyoverridesdir)
+    ],
+    [AC_MSG_WARN([pgobject-3.0 not found; disabling vips8 python support])
+    ])
+fi
+
+if test x"$enable_pyvips8" != x"no"; then
+  AM_CONDITIONAL(ENABLE_PYVIPS8, true)
+  enable_pyvips8=yes
+else
+  AM_CONDITIONAL(ENABLE_PYVIPS8, false)
+  enable_pyvips8=no
+fi
+
 # hmm, these don't have .pc files on ubuntu 5.10, how odd
 FIND_ZIP(
   [with_zip=yes],
@@ -755,9 +778,7 @@ if test x"$with_python" != "xno"; then
     with_python=no
     AC_MSG_WARN([C++ is off, disabling Python binding])
   else
-    AM_PATH_PYTHON(2.7,
+    AM_PATH_PYTHON(2.7,,
-      [pyoverridesdir="\$(pyexecdir)/gi/overrides"
-       AC_SUBST(pyoverridesdir)],
       [with_python=no
        AC_MSG_WARN([Python not found; disabling Python binding])])
   fi
@@ -854,7 +875,7 @@ AC_OUTPUT([
 ])
 
 AC_MSG_RESULT([
-* general build options
+* build options
 native win32:				$vips_os_win32
 native OS X:				$vips_os_darwin
 open files in binary mode: 		$vips_binary_open
@@ -864,8 +885,11 @@ build C++ components:			$enable_cxx
 build docs with gtkdoc:			$enable_gtk_doc
 install docs:				$enable_docs
 gobject introspection: 			$found_introspection
+build vips7 Python binding:		$with_python
+install vips8 Python overrides:		$enable_pyvips8
+  (requires pygobject-3.1.0 or later)
 
-* optional packages and modules
+* optional dependencies
 use fftw3 for FFT: 			$with_fftw
 Magick package: 			$with_magickpackage
 file import with libMagick: 		$with_magick
@@ -886,4 +910,4 @@ file import/export with libjpeg:	$with_jpeg
 image pyramid export:			$with_gsf
   (requires libgsf-1 1.14.27 or later)
 use libexif to load/save JPEG metadata: $with_libexif
-build Python binding: 			$with_python])
+])