Re: Bug#462232: gsl: Please build depend on libblas-dev instead of refblas3.dev
On 28 January 2008 at 09:43, Matthias Klose wrote:
| Dirk Eddelbuettel writes:
| >
| > Hi Doko,
| >
| > I think I have it sorted out.
| >
| > On 28 January 2008 at 01:12, Matthias Klose wrote:
| > | reopen 462232
| > | thanks
| > |
| > | Dirk, there are some problems:
| > |
| > | - the current build doesn't use any external blas library, the build
| > | dependencies seem to be bogus.
| >
| > That seems to be the same for all gsl builds, not only the newest. I have
| > logs of my builds here all the way back from 1.3 in 2003 to 1.10-{1,2,3}.
| >
| > So I think this is an upstream choice,
|
| so *why* the build dependency? I checked. It is not needed for the build.
Fair point.
| > See the program below. You can build it with _either_ the supplied blas, or
| > the regular blas, or Atlas. Your choice. I think that is good:
| >
| > edd@ron:~/src/progs/C> gcc -Wall -O2 -o blas_sgemm_gsl_blas blas_sgemm_gsl.c -lblas
| > edd@ron:~/src/progs/C> gcc -Wall -O2 -o blas_sgemm_gsl_gslblas blas_sgemm_gsl.c -lgslcblas
| > edd@ron:~/src/progs/C> ls -l blas_sgemm_gsl_*
| > -rwxr-xr-x 1 edd edd 7105 2008-01-27 19:12 blas_sgemm_gsl_blas
| > -rwxr-xr-x 1 edd edd 7105 2008-01-27 19:12 blas_sgemm_gsl_gslblas
| > edd@ron:~/src/progs/C> ./blas_sgemm_gsl_blas
| > [ 367.76, 368.12
| > 674.06, 674.72 ]
| > edd@ron:~/src/progs/C> ./blas_sgemm_gsl_gslblas
| > [ 367.76, 368.12
| > 674.06, 674.72 ]
| > edd@ron:~/src/progs/C>
|
| so why is the duplication of the library a good point? we always strip
| off or don't use included copies of zlib, and other stuff. why keep a
| copy for this package? with the same reason python-numeric and
| python-numarray could use the included copy.
Upstream ... It's a big package, blas/atlas is complicated (3 levels etc,
comparison with zlib is not really a match), consistency with other distros /
uses (where one would find libgslcblas)).
| > | - if the external libs are used, you have to change the name of the
| > | library package.
| >
| > I don't understand.
|
| Apparently the package doesn't depend on libg2c0 and was not built
| using g77, so you don't need to.
Ok.
| > | - gsl cannot use the optimized blas libraries provided by atlas, it
| > | really should use the external libs. Or is there a reason not to
| > | do so?
| >
| > It can. You'd use it when you build apps against GSL, and by changing your
| > Makefiles to point to Atlas instead of the default fallback libgslcblas.
| >
| > Gsl being a library, it doesn't actually use blas itself which is why there
| > is no depends.
| >
| > Does this make sense now?
|
| well, except that we have another copy of blas in the archive.
Yes, that's one of the small prices we pay for having gsl in the
archive. 200kb for the .so, 315kb for the .a. I can live with that.
I'll adjust the build-dep on blas.
Dirk
--
Three out of two people have difficulties with fractions.
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