On Sat, Jul 30, 2011 at 09:38:29PM +0200, Thomas Spura wrote:
> On Sat, 30 Jul 2011 19:44:41 +0300
> Jussi Lehtola wrote:
>
> > Hi,
> >
> >
> > I tried using
> > %global gccver %(gcc -dumpversion)
> > %if %{gccver} >= 4.6.0
> > foo here
> > %endif
> >
> > to conditionalize usage of quadruple precision support in a spec file
> > that ships on multiple distros, but the comparison gives the error
> >
> > parseExpressionBoolean returns -1
> >
> > Is there a way to check if the gcc version is sufficient with some rpm
> > macro?
>
> Using python for parsing seems to work, but it looks a bit weird ;)
>
> %global true_or_false %(python -c "print('%{gccver}' >= '4.6.0')")
Watch out, this is very dangerous! You are comparing strings, not
versions:
>>> print '4.6.2' >= '4.6.12'
True
The better way would be to use distutils.version:
>>> from distutils.version import StrictVersion
>>> print StrictVersion('4.6.2') >= StrictVersion('4.6.12')
False
It is possible to write this one one line, but that looks reall ugly:
%global true_or_false %(python -c "from distutils.version import StrictVersion
as v; print v(%{gccver}) >= v('4.6.0')")
HTH,
Niels
> %if %{true_or_false} == "True"
> echo "true"
> %else
> echo "false"
> %endif
>
> Hope that helps,
> Thomsa
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