[Buildroot] Support for lapack

[Buildroot] Support for lapack

[Andreas]

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Hi,

How do I configure Fortran properly for lapack? I need it on host for the
python-scikit-learn package. I get the following error.

-- The Fortran compiler identification is unknown
-- The C compiler identification is GNU 8.3.0
CMake Error at CMakeLists.txt:3 (project):
  No CMAKE_Fortran_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "FC" or the CMake cache entry CMAKE_Fortran_COMPILER to the full
  path to the compiler, or to the compiler name if it is in the PATH.


-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring incomplete, errors occurred!
See also
"/buildroot/output/build/host-lapack-3.10.1/buildroot-build/CMakeFiles/CMakeOutput.log".
See also
"/buildroot/output/build/host-lapack-3.10.1/buildroot-build/CMakeFiles/CMakeError.log".

################################################################################
#
# python-scikit-learn
#
################################################################################

PYTHON_SCIKIT_LEARN_VERSION = 1.3.0
PYTHON_SCIKIT_LEARN_SOURCE =
scikit-learn-$(PYTHON_SCIKIT_LEARN_VERSION).tar.gz
PYTHON_SCIKIT_LEARN_SITE =
https://files.pythonhosted.org/packages/72/cd/4761675df1b3dd93072c89697278f3ed3dc004a60c034cd2603c43ff64b5
PYTHON_SCIKIT_LEARN_SETUP_TYPE = setuptools
PYTHON_SCIKIT_LEARN_LICENSE = BSD-3-Clause
PYTHON_SCIKIT_LEARN_LICENSE_FILES = COPYING
PYTHON_SCIKIT_LEARN_DEPENDENCIES = \
host-python-cython \
host-python-scipy \
python-joblib \
python-threadpoolctl

# disable test execution when cross compiling
PYTHON_SCIKIT_LEARN_ENV = PYTHON_CROSSENV=1

$(eval $(python-package))

################################################################################
#
# lapack
#
################################################################################

LAPACK_VERSION = 3.10.1
LAPACK_LICENSE = BSD-3-Clause
LAPACK_LICENSE_FILES = LICENSE
LAPACK_SITE = $(call github,Reference-LAPACK,lapack,v$(LAPACK_VERSION))
LAPACK_CPE_ID_VENDOR = lapack_project
LAPACK_INSTALL_STAGING = YES
LAPACK_SUPPORTS_IN_SOURCE_BUILD = NO
LAPACK_CONF_OPTS = -DLAPACKE=ON -DCBLAS=ON

ifeq ($(BR2_PACKAGE_LAPACK_COMPLEX),y)
LAPACK_CONF_OPTS += \
-DBUILD_COMPLEX=ON \
-DBUILD_COMPLEX16=ON \
-DLAPACKE_BUILD_COMPLEX=ON \
-DLAPACKE_BUILD_COMPLEX16=ON
else
LAPACK_CONF_OPTS += \
-DBUILD_COMPLEX=OFF \
-DBUILD_COMPLEX16=OFF \
-DLAPACKE_BUILD_COMPLEX=OFF \
-DLAPACKE_BUILD_COMPLEX16=OFF
endif

$(eval $(cmake-package))
$(eval $(host-cmake-package))

Andreas

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Re: [Buildroot] Support for lapack

[Thomas Petazzoni via buildroot]

Hello Andreas,

On Sun, 6 Aug 2023 23:36:34 +0200
Andreas <andreasembbuild@gmail.com> wrote:

> How do I configure Fortran properly for lapack? I need it on host for the
> python-scikit-learn package. I get the following error.

Please look at the patch series at:

  https://patchwork.ozlabs.org/project/buildroot/list/?series=314036

for python-scikit-learn.

Note: this is difficult stuff to package, you're now starting with easy
stuff :-)

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] Support for lapack

[Andreas]

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Hi Thomas,

Thanks for the hint. I followed this patch. I think from the errors I saw
my problem is most likely the toolchain. This dependency
respectively depends on BR2_TOOLCHAIN_HAS_FORTRAN # python-scipy. Since I
am migrating from an old buildroot to a recent version of it might also be
part of the problem. I know the toolchain menu in the menu config but like
to set it programatically in the build config. But I don't know how exactly
and which options depend on what. Basically I think I need a toolchain with
support for c++, wchar, threads, fortran, openblas and arch. I found this
resource:
http://underpop.online.fr/b/buildroot/en/dependencies-target-toolchain-options.htm.gz
but
still don't know how to set it properly in the config. Can you point me to
an example?

Thanks,
Andreas


Am So., 6. Aug. 2023 um 23:58 Uhr schrieb Thomas Petazzoni <
thomas.petazzoni@bootlin.com>:

> Hello Andreas,
>
> On Sun, 6 Aug 2023 23:36:34 +0200
> Andreas <andreasembbuild@gmail.com> wrote:
>
> > How do I configure Fortran properly for lapack? I need it on host for the
> > python-scikit-learn package. I get the following error.
>
> Please look at the patch series at:
>
>   https://patchwork.ozlabs.org/project/buildroot/list/?series=314036
>
> for python-scikit-learn.
>
> Note: this is difficult stuff to package, you're now starting with easy
> stuff :-)
>
> Thomas
> --
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com
>

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Re: [Buildroot] Support for lapack

[Thomas Petazzoni via buildroot]

Hello,

On Mon, 7 Aug 2023 15:41:53 +0200
Andreas <andreasembbuild@gmail.com> wrote:

> Thanks for the hint. I followed this patch. I think from the errors I saw
> my problem is most likely the toolchain. This dependency
> respectively depends on BR2_TOOLCHAIN_HAS_FORTRAN # python-scipy. Since I
> am migrating from an old buildroot to a recent version of it might also be
> part of the problem. I know the toolchain menu in the menu config but like
> to set it programatically in the build config.

Not sure to understand what you mean here by "set it programmatically".

> But I don't know how exactly
> and which options depend on what. Basically I think I need a toolchain with
> support for c++, wchar, threads, fortran, openblas and arch.

Then use a toolchain that provides all of this, or ask Buildroot to
build its own toolchain with those features enabled.

> I found this
> resource:
> http://underpop.online.fr/b/buildroot/en/dependencies-target-toolchain-options.htm.gz

Not sure why you go to some random website. This content comes from the
Buildroot manual, see section 18.2.4 at
https://buildroot.org/downloads/manual/manual.html.

> but
> still don't know how to set it properly in the config. Can you point me to
> an example?

I don't quite understand what problem you're trying to solve, so it's
quite difficult to help.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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