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5,483 bytes added ,  01:05, 1 August 2016
| Afterwards || Complete any goals which are left. Continue contributing to Octave...
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== Building Pytave on windows ==
 
Windows build for pytave was tried but we could not get it to work. Tatsuro was actually the one who did most of the work and I followed with his help.
Here are the things that were tried with details:
'''OS used''': Windows 10
 
=== Using Cygwin ===
 
At first I tried to build pytave using [https://www.cygwin.com/ cygwin] which is a linux environment for windows. I had used cygwin previously, so I tried the build using cygwin.
After installing ''apt-cyg'' in it, I downloaded many other packages like autotools, autoconf and others to make it suitable for the build. My octave was installed in ''e:/octave-4.0.0/''. When I ran ''configure'' of pytave with ''./configure OCTAVE_CONFIG=e:/octave-4.0.0/bin/octave-config.exe'' then it showed that "octave development packages" were not found. Also tried to use cygwin style with "cygdrive/e/octave-4.0.0/bin/octave-config.exe" but the same error occurred.
 
So I installed "octave-devel" package using "apt-cyg". It took more than 3 hours and installed a lot of packages into cygwin. It also installed octave in ''/bin/octave'' of cygwin. Now, I tried using the ''octave-config'' file in ''/bin'' of cygwin but I got the same error. I also tried using the octave-config in the octave installation directory on windows but the error persisted.
 
=== Using Msys2 ===
 
Tatsuro told to use [https://msys2.github.io/ msys2] for the job. He also suggested to use octave-4.0.2 as octave-4.0.0 was buggy on windows.
Later on he provided development version of octave that he built using octave itself (along with msys2). I started using that development version (4.1.0+) of octave. He also suggested the following steps after installing msys2 for the setup:
# [https://sourceforge.net/p/msys2/wiki/MSYS2%20installation/ Install Msys2 and update core and basics packages]
# Install base-devel with ''pacman -S --needed base-devel msys/dos2unix''
# Install mercurial with ''pacman -S mercurial''
 
At this point I had many questions. There were mingw64 toolchains and also the non-mingw version of those toolchains on Msys2. Moreover, for any program such as Python, we can call either ''/c/Python27/python.exe'' from windows of simply ''/bin/python'' which will run the *nix executable. Also, I could not find ''libboost-python'' for Msys2 which is a dependency for pytave.
 
Tatsuro told to use the mingw64 toolchains that come with octave (for consistency reasons). As octave has msys toolchains along with it. And just use the extra MSYS2 toolchains on top of it.
# open octave (gui/cli)
# run ''system bash''
# export path from bash ''export PATH=$PATH:/c/msys64/usr/bin''
 
But at this point I just went ahead with using MSYS2 shell as when trying out msys shell of octave I found out that many things that I used in msys2, specially pacman, were missing.
 
Also, it's better to use the windows executables for the build. Moreover there were boost packages for mingw on msys2 which could be installed with ''pacman -S mingw64/mingw-w64-x86_64-boost'' for 64 bit version or ''pacman -S mingw32/mingw-w64-i686-boost'' for 32 bit version.
After installing boost too, the build was failing with errors related to boost libraries. I saw that the *.a and *.dll files had '-mt' appended to their name and didn't work because of that... Once I renamed them to remove the '-mt' then the configure could find the libs and finally the ''configure'' steps was successful with just one warning that 'uselocale' was not supported!
 
Now when I ran ''make'' then ''libtool'' weirdly escaped all the '\' characters in the paths for libraries found during the configure step. Ex "-IE:\octave_dev\include\octave-4.1.0+ -IE:\octave_dev\include\octave-4.1.0+/octave" was passed as "-IE:octave_devincludeoctave-4.1.0+ -IE:octave_devincludeoctave-4.1.0+/octave". I have no knowledge of how exactly the configure and m4 scripts co-ordinate the tasks and hence it was dificult for me to find the cause for this. I tried to see how to change the default path separator but it didn't work.
Tatsuro told to use 'CPPFLAGS' to pass these directories during configure only. This worked and the ''make'' step moved past that point.
 
Now a new error arised, the Makefile was calling 'grep/sed' at some point which showed that the library file have been moved (which was present in /e/octave_dev/lib/octave/4.1.0+/) And then the script tries to use it from /usr/lib/octave/4.1.0+. But the library files were actually present in the previous directory only and not in /usr/lib. So, we passed 'LDFLAGS' along with 'CPPFLAGS' during configure. But the error persisted. Editing the last parte of liboct*.la files to change the 'libdir' didn't work as well.
As per Mike's suggestion deleting the liboct*.la files helped and the ''make'' step moved even furthur. Now the errors showed some missing libraries (lapack, GraphickMagik, ...)
Since all these libraries were present along with octave so we added "/e/octave_dev/lib" to LDFLAGS too. Now the build went even furthur. This time there were some C++11 errors. As per Mike's and Tatsuro's suggestions Octave uses 4.9.3 gcc on windows and gcc changed the library around version 5. Msys2 had GCC 5.4 which caused the errors. So, either pass all the gcc tools in octave_dev/bin to configure on MSYS2 or use octave's shell with MSYS2 on top of it.
At this point, I switched to using the bash shell present with octave.
 
=== Use MSYS2 on top of Octave's MSYS environment ===

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