Re: [gentoo-dev] per-package environment variables.

[Antst GD <antst@ifm.liu.se>]

I've checked /usr/lib/portage/pym/portage.py
With minor changes, this is is extremely easy to add provided syntax to 
current portage. Just about 5 lines of code. :)
I can make a patch, people who interesting can try to use it as a 
testers  :)


Antst GD wrote:
> OK, lets develop discussion about option to choose environment variables 
> per-package (compiler, flags and not only).
> 
> As some of us know, definition of problem already include 90% solution. 
> So, lets start from user-side.
> Want we want to see?
> 1) Possibility to change ENV during building some packages.
> 2) it should be automatic, no more definition of environment variables 
> and manual emerging packages. No more spaming /etc/make.conf with some 
> environment variables which correspond only to one package (RXVT_TERM, 
> for example)
> 3) Solution must  be flexible and allow us to have not only 
> "per-package" variables set, but also define some general sets for 
> inclusion. For example if we want to build soft1,soft2,ans soft3 with 
> IFC, we really don't want to have 3 copies of something like:
> F77=ifc
> FC=ifc
> F90=ifc
> FFLAGS="-xN -ip"
> Moreover, when we will decide to change CPU, we will not need to edit 3 
> files and change -xN to -xP. We want to do it once. :)
> 
> 4) BTW, in such case it also not bad to have option to include something 
> like
> USE="ifc"
> into this environment, and it should be parsed in proper way. I hope 
> that this is clear. If we want to build something with IFC and set 
> proper variables, we really don't want to go and edit one more file 
> (/etc/portage/package.use). And we don't want to edit also two files, 
> when we will figure out that we like coming gfortran :)
> 
> 5) even more. I'll start not with per-package basic, but with 
> per-environment basic, as a first iteration.
> 
> So, lets define our problem in more details:
> 1) Assume that default configuration of my system is
> GCC 3.4.1
> CFLAGS="-O2 -pipe" in /etc/make.conf
> LINGUAS="ru" in /etc/make.conf
> there is no defined ifc and icc USE flags in /etc/make.conf
> 
> 2) I have set of packages, that require something "extra"
> lam-mpi : want to compile with ICC, IFC
> blas-reference : want to compile with g77 and high optimization
> lapack-reference : want to compile with g77 and high optimization
> blas-atlas: want to compile with IFC, ICC
> lapack-atlas: want to compile with IFC, ICC
> xine-lib : want to compile with low-optimization for GCC
> open office : want to compile with LANGUAGE="RUSS" and GCC 3.3.4 and 
> low-optimization
> kde-i18n : want to have with LINGUAS="fr" and GCC 3.3.4
> rxvt : want to compile with RXVT_TERM=xterm
> octave : want to build with high-optimization for GCC
> 
> 
> so, what I see?
> Something like:
> 
> #cat /etc/portage/package.env
> lam-mpi: icc ifc
> blas-reference: g77high.env
> lapack-reference: g77high.env
> blas-atlas: ifc.env icc.env
> lapack-atlas: ifc.env icc.env
> xine-lib: GCC_lowopt.env
> openoffice: language_ru.env GCC_334.env GCC_lowopt.env
> kde-i18n: linguas_fr.env
> rxvt: rxvt.env
> octave: GCC_highopt.env
> 
> 
> #ls /etc/portage/env
> ifc.env
> ifc.env
> GCC_highopt.env
> GCC_lowopt.env
> rxvt.env
> linguas_fr.env
> language_ru.env
> GCC_334.env
> g77high.env
> 
> and
> #cat /etc/portage/env/icc.env
> CC=icc
> CXX=icc
> CFLAGS="-O2 -xN -noalign"
> CXXFLAGS=$CFLAGS
> USE="icc"
> 
> #cat /etc/portage/env/GCC_highopt.env
> CFLAGS="-O3 -ffast-math -funroll-all-loops -fmove-all-movables"
> 
> #cat /etc/portage/env/GCC_lowopt.env
> CFLAGS="-O1"
> 
> #cat /etc/portage/env/GCC_334.env
> CC=/usr/i686-pc-linux-gnu/gcc-bin/3.3/gcc
> g77=/usr/i686-pc-linux-gnu/gcc-bin/3.3/g77
> 
> And rest it similar.
> 
> Of course, it could be not so bad, to have option, to include name of 
> file with ENV, or just env, to not produce tens of files with one 
> variable, like RXVT_TERM="xterm"... There is seems to be two solutions:
> 1) just have second file with definitions, where not filenames, but 
> defined variables.
> 2) change syntax of /etc/portage/package.env in such way, that allow to 
> include both kind of records, filename and strict definition inline.
> something like
> openoffice: GCC_334.env GCC_lowopt.env -- LANGUAGE="RUSS"
> 
> 
> For the moment both solutions looks ugly for me. At least I can't 
> imaging simple and easy-to-understand syntax for package.env, which will 
> look nice and will parce without problems.
> 
> What do you think about?
> 


-- 
Anton Starikov

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