Re: building package: gcc 7.5.0 referenced instead of latest gcc; not sure why

[Andy Tai]

Thanks.  I figured out the problem, gcc version was not the problem

But gcc 10 did help by giving useful messages to point out the issue.

Thanks!

On Tue, Feb 23, 2021 at 8:12 PM zimoun <zimon.toutoune@gmail.com> wrote:
>
> Hi Andy,
>
> On Mon, 22 Feb 2021 at 16:10, Andy Tai <atai@atai.org> wrote:
>
> > ./pre-inst-env gcc --version
> > gcc (GCC) 10.2.0
> > Copyright (C) 2020 Free Software Foundation, Inc.
>
> Well, this GCC 10.2 is not used by the build-system…
>
> > I tried to update a package definition (vtk) and then tried to build it
> >
> > ./pre-inst-env guix build -k -K vtk
>
> …which instead uses 7.5.
>
>
> > I am not sure why gcc 7.5 is being used;   no where in the package
> > definition scm file references explicitly gcc 7.5.  I did not install
> > gcc 7.5 explicitly either.
>
> For example,
>
> --8<---------------cut here---------------start------------->8---
> $ guix environment vtk -C
> [env]$ gcc --version
> gcc (GCC) 7.5.0
> Copyright (C) 2017 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> --8<---------------cut here---------------end--------------->8---
>
> Quickly said, the GCC comes from the cmake-build-system.
>
> > (gcc 7.5 has problem compiling the package source so I want to make
> > sure later gcc used)
>
> It depends on what you want at the end: a variant for personal use or
> for submitting.
>
> For personal use, you can try:
>
>   guix build -L /path/to/variant vtk --with-c-toolchain=gcc-toolchain@10
>
> well, use package transformations, at CLI level or package level [1].
>
> For submitting, I do not know what is the best.
>
>
> Hope that helps,
> simon
>
> 1: https://guix.gnu.org/manual/devel/en/guix.html#Defining-Package-Variants



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Andy Tai, atai@atai.org, Skype: licheng.tai, Line: andy_tai, WeChat: andytai1010
Year 2021 民國110年
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