significance of collisions in 'guix environment'?

[Paul Garlick]

Hi All,

I am in the middle of upgrading the Gmsh package in Guix.  I have cloned the Guix repository, set up a profile for development, and run bootstrap, configure and make.  In setting up the build environment for Gmsh, using 'guix environmnet ...', there are surprising collision messages generated:

I do:

$ ./pre-inst-env guix environment --pure gmsh

I get:

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warning: collision encountered: /gnu/store/m6s3bz6a2sv7015z78sfzdk5ngkzdwwg-gfortran-4.9.3/libexec/gcc/x86_64-unknown-linux-gnu/4.9.3/liblto_plugin.so.0.0.0 /gnu/store/frrj3bfbmg5vrd0flh9cf8j64h7cr2v4-gcc-4.9.3/libexec/gcc/x86_64-unknown-linux-gnu/4.9.3/liblto_plugin.so.0.0.0

warning: arbitrarily choosing /gnu/store/m6s3bz6a2sv7015z78sfzdk5ngkzdwwg-gfortran-4.9.3/libexec/gcc/x86_64-unknown-linux-gnu/4.9.3/liblto_plugin.so.0.0.0

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There are 14 gfortran-related messages and a message regarding ld-wrapper and binutils.

How should these messages be interpreted?  Could there be duplication in the package inputs?  

I have noticed that Gmsh lists gfortran and lapack as propagated-inputs and lapack also lists gfortran as an input.

Regards,

Paul.