[Spice-devel] [PATCH spice-common v2] spice-deps: Set python version based on modules availability

[Christophe Fergeau]

On Tue, Nov 29, 2016 at 10:09:43AM +0100, Pavel Grunt wrote:
> On Tue, 2016-11-29 at 09:52 +0100, Christophe Fergeau wrote:
> > On Mon, Nov 28, 2016 at 03:11:18PM +0100, Pavel Grunt wrote:
> > > Building spice or spice-gtk from git requires python modules
> > > pyparsing
> > > and six. Search for them in the both Python versions and set
> > > the Python version accordingly.
> > > ---
> > > v2: Keep user set (required) version of Python
> > > ---
> > >  m4/spice-deps.m4 | 20 +++++++++++++++++---
> > >  1 file changed, 17 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/m4/spice-deps.m4 b/m4/spice-deps.m4
> > > index 3b22422..3f9af43 100644
> > > --- a/m4/spice-deps.m4
> > > +++ b/m4/spice-deps.m4
> > > @@ -155,15 +155,29 @@ AC_DEFUN([SPICE_CHECK_GLIB2], [
> > >  # tarballs so they are disabled by default.
> > >  #---------------------------
> > >  AC_DEFUN([SPICE_CHECK_PYTHON_MODULES], [
> > > -    AM_PATH_PYTHON
> > >      AC_ARG_ENABLE([python-checks],
> > >          AS_HELP_STRING([--enable-python-checks=@<:@yes/no@:>@],
> > >                         [Enable checks for Python modules needed
> > > to build from git @<:@default=no@:>@]),
> > >                         [],
> > >                         [enable_python_checks="no"])
> > >      if test "x$enable_python_checks" != "xno"; then
> > > -        AX_PYTHON_MODULE([six], [1])
> > > -        AX_PYTHON_MODULE([pyparsing], [1])
> > > +        AS_IF([test -n "$PYTHON"], # already set required PYTHON
> > > version
> > > +              [AM_PATH_PYTHON
> > > +               AX_PYTHON_MODULE([six], [1])
> > > +               AX_PYTHON_MODULE([pyparsing], [1])],
> > > +              [PYTHON=python3
> > > +               AX_PYTHON_MODULE([six])
> > > +               AX_PYTHON_MODULE([pyparsing])
> > > +               test "$HAVE_PYMOD_SIX" = "yes" && test
> > > "$HAVE_PYMOD_PYPARSING" = "yes"],
> > 
> > Sorry, just noticed that you can do
> > AX_PYTHON_MODULE([six], [0], [python3]) (which is the default)
> > or
> > AX_PYTHON_MODULE([six], [0], [python])
> 
> I think some distros (Arch Linux ?) ship python as python3, looking at
> AX_PYTHON_MODULE I would explicitly set python2 instead of python

The macro documentation is explicitly saying to use python3 for python3,
and python for python2
https://www.gnu.org/software/autoconf-archive/ax_python_module.html
I did not check what the macro does with that 3rd arg though.

Christophe
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