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Genis

Member

Registered: 2017-01-09

Posts: 31

[SOLVED] Setting cmake python version

I need to install a Shiny server from source, and to do so I'm following the installation instructions at the corresponding Github site.

Installation fails after the cmake instruction:

cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DPYTHON="$PYTHON" ../

Returning:

CMake Warning:
  Manually-specified variables were not used by the project:

    PYTHON

-- Build files have been written to: /home/user/shiny-server/tmp

Though it appear as a warning, it will result in a later error.

According to the site's FAQs, this is related to the version of Python, which needs to be 2.6.x or 2.7.x. So previously to running cmake I set

PYTHON=`which python2`

(which is version 2.7.16), and create a symbolic link to it from /usr/bin/local as

sudo ln -s $PYTHON /usr/local/bin/python

. Since that directory goes before than /usr/bin/python of in PATH, I understand that it should be the Python version used by default.

However, after these changes the warning and posterior error remains. Any ideas on what could be failing?

Last edited by Genis (2019-05-19 08:32:24)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,656

Re: [SOLVED] Setting cmake python version

Any reason you are not just simply using the AUR package (note the PKGBUILD and the additional adjustments it makes at least...)

FWIW you say it will result in an error, so you might want to post that, and in fact the entire output you are receiving.

Last edited by V1del (2019-05-17 10:41:46)

Genis

Member

Registered: 2017-01-09

Posts: 31

Re: [SOLVED] Setting cmake python version

Couldn't imagine it would be at AUR. I guess I can try that way.

It would useful to understand though why the other approach didn't work. I copy all the output below. First cmake.

cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DPYTHON="$PYTHON" ../

-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Downloading pandoc
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-- gunzip /home/user/shiny-server/tmp/external/pandoc/pandoc.gz
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-- gunzip /home/user/shiny-server/tmp/external/pandoc/pandoc-citeproc.gz
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    PYTHON


-- Build files have been written to: /home/user/shiny-server/tmp

Then make

[ 50%] Building CXX object src/CMakeFiles/shiny-server.dir/launcher.cc.o
[100%] Linking CXX executable ../../bin/shiny-server
[100%] Built target shiny-server

The error appears in the next step, when executing npm.

mkdir ../build
(cd .. && ./bin/npm --python="$PYTHON" install)

./bin/npm: line 4: /home/user/shiny-server/bin/../ext/node/bin/node: No such file or directory

Last edited by Genis (2019-05-17 12:49:05)

Lone_Wolf

Member

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,911

Re: [SOLVED] Setting cmake python version

Manually-specified variables were not used by the project:

Usually that message means cmake can't find the variable in CMakeLists.txt OR the input is not what cmake expects.

The aur PKGBUILD uses several tricks to get cmake and npm to find python2 , to replicate them from CLI you'd have to execute the same steps.

You could try building in a chroot where python2 is the only python that's present, but using the aur package seems a lot easier.

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)

Genis

Member

Registered: 2017-01-09

Posts: 31

Re: [SOLVED] Setting cmake python version

Yes it is. I guess this is one of the reasons why there is an AUR package in the first place.

Thank you both for your help!