On Tue, Apr 15, 2008 at 3:54 PM, William Stein <[EMAIL PROTECTED]> wrote:
>
>  On Tue, Apr 15, 2008 at 6:33 AM, Ondrej Certik <[EMAIL PROTECTED]> wrote:
>  >
>
>
> >  Hi,
>  >
>  >  a very beginner question, if I change some .pyx files and want them to
>  >  be recompiled, I thought I need to do "sage -b", like this:
>  >
>  >  $ ./sage -b
>  >
>  >  ----------------------------------------------------------
>  >  sage: Building and installing modified SAGE library files.
>  >
>  >
>  >  Installing c_lib
>  >  scons: `install' is up to date.
>  >  running install
>  >  running build
>  >  running build_py
>  >  running build_ext
>  >  building 'sage.modules.free_module_element' extension
>  >  error: unknown file type '.pyx' (from 
> 'sage/modules/free_module_element.pyx')
>  >  sage: There was an error installing modified sage library code.
>  >
>  >
>  >  real    0m0.949s
>  >  user    0m0.768s
>  >  sys     0m0.160s
>  >
>  >
>  >
>  >  I am using the linux binary version. So I guess I need to build Sage
>  >  myself from sources, if I want to do development, right? Compiling
>  >  now... I hoped I could skip this step as I had just couple hours to
>  >  work on it -- next time I'll recompile stuff over the night, so that I
>  >  can hack on it the next day. :)
>
>  The above is trac #2851
>
>       http://trac.sagemath.org/sage_trac/ticket/2851
>
>  which I fixed last night.  Didier's workaround is one way to deal
>  with the problem.  Another is to touch any cython file.  A third
>  is to delete SAGE_ROOT/devel/sage/.cython_hash

Thanks Didier and William for the quick response!

Indeed deleting the .cython_hash fixes the problem, even though now I
am recompiling the whole Sage library, but hopefully it won't take
long.

Ondrej

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