Re: Build Mesa with a different toolchain version

[Efraim Flashner <efraim@flashner.co.il>]

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On Tue, Jun 01, 2021 at 09:46:56PM -0300, Thiago Jung Bauermann wrote:
> Hello,
> 
> I'm having and issue with Mesa on i686-linux which I suspect is caused by
> the version of GCC used to build it (i.e. 7.5.0).
> 
> To test my theory, I'm trying to build Mesa with a newer version of the
> compiler. I tried a few different things, but none worked. I would be
> grateful if someone could help me figure out how to do this:
> 
> Try #1:
> 
> $ guix build --system=i686-linux \
> 	--with-input=gcc-toolchain=gcc-toolchain@10.3.0 mesa

I believe you have the wrong command here. What you want is
$ guix build --system=i686-linux \
	--with-c-toolchain=mesa=gcc-toolchain@10 mesa

$ guix gc --references /gnu/store/8klhnfd8a5syhfl3bj2zqc06fvxiqdwa-mesa-20.2.4 | grep gcc
/gnu/store/nyxr5cb88x18mnhj88zkd9yisdlnxhl2-gcc-toolchain-10.3.0
/gnu/store/rgj02zlyqrg7ygcynwv8w35nc5czxi9l-gcc-10.3.0-lib

$ guix environment --ad-hoc gcc-toolchain -- ldd /gnu/store/8klhnfd8a5syhfl3bj2zqc06fvxiqdwa-mesa-20.2.4/lib/libOSMesa.so.8.0.0 | grep gcc
        libstdc++.so.6 => /gnu/store/rgj02zlyqrg7ygcynwv8w35nc5czxi9l-gcc-10.3.0-lib/lib/libstdc++.so.6 (0x00007ff4c0b28000)
        libgcc_s.so.1 => /gnu/store/rgj02zlyqrg7ygcynwv8w35nc5czxi9l-gcc-10.3.0-lib/lib/libgcc_s.so.1 (0x00007ff4c09cb000)


> […]
> successfully built /gnu/store/bg01dw0178yb7v9xr4zmq5f05200f2ql-mesa-20.2.4.drv
> /gnu/store/mvy7pl73yqrd9pi3k3xq14i6dmnfbl8s-mesa-20.2.4-bin
> /gnu/store/ii8fbly1s19qwpnwv002fd2pxk2h96ba-mesa-20.2.4
> 
> So aparently it worked. But when checking the libraries, they still
> link to GCC 7.5.0.
> 
> $ ldd /gnu/store/ii8fbly1s19qwpnwv002fd2pxk2h96ba-mesa-20.2.4/lib/libOSMesa.so.8.0.0 | grep gcc 
>         libstdc++.so.6 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libstdc++.so.6 (0xf51d9000)
>         libgcc_s.so.1 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libgcc_s.so.1 (0xf50b9000)
> 
> And surprisingly, when changing the requested gcc-toolchain version,
> guix doesn't attempt to build anything and just returns the same
> store items from the “10.3.0” build:
> 
> $ guix build --system=i686-linux --with-input=gcc-toolchain=gcc-toolchain@11.1.0 mesa
> /gnu/store/mvy7pl73yqrd9pi3k3xq14i6dmnfbl8s-mesa-20.2.4-bin
> /gnu/store/ii8fbly1s19qwpnwv002fd2pxk2h96ba-mesa-20.2.4
> 
> Try #2:
> 
> Next, I tried using ‘package-input-rewriting’ by putting the following
> package definition in a channel I created locally (with the appropriate
> ‘#:use-module’ directives at the top):
> 
> ```
> (define gcc->gcc-10
>   (package-input-rewriting `((,gcc . ,gcc-10)
>                              (,(make-libstdc++ gcc) . ,(make-libstdc++ gcc-10)))))
> 
> (define-public mesa-10
>   (package
>     (inherit (gcc->gcc-10 mesa))
>     (name "mesa-10")))
> ```
> 
> And then:
> 
> $ guix pull && guix build --system=i686-linux mesa-10
> […]
> successfully built /gnu/store/g4j9kmxgp6lashyipcydn7i6vh2v4s3c-mesa-10-20.2.4.drv
> /gnu/store/8iiwn9cnjlfxfi7m1fmdavzgr7y38vv7-mesa-10-20.2.4-bin
> /gnu/store/hjci6cqw76hvdawdl04kjmbajklsdwx2-mesa-10-20.2.4
> 
> And unfortunately I saw many GCC 7.5.0 processes in the build, for example
> (command line abridged because it's too big):
> 
> $ pgrep -u guixbuilder01 -a -f cc1
> 119240 /gnu/store/…-gcc-7.5.0/libexec/gcc/i686-unknown-linux-gnu/7.5.0/cc1 […]
> 
> And indeed, still linked to GCC 7.5.0 libraries:
> 
> $ ldd /gnu/store/hjci6cqw76hvdawdl04kjmbajklsdwx2-mesa-10-20.2.4/lib/libOSMesa.so.8.0.0 | grep gcc
>         libstdc++.so.6 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libstdc++.so.6 (0xf51ff000)
>         libgcc_s.so.1 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libgcc_s.so.1 (0xf50df000)
> 
> Also tried using GCC 11 by doing `s/-10/-11/g` in the code I quoted above
> and building again:
> 
> $ guix build --system=i686-linux mesa-11
> […]
> successfully built /gnu/store/vnmwibfpsw3fkm7q7y6z4r5273ri4qra-mesa-11-20.2.4.drv
> /gnu/store/w5l307c1vnsik5h1zd9bcjzld2yp6xyl-mesa-11-20.2.4-bin
> /gnu/store/l98bxwa5psb3yx56hhb78zr043s10p7q-mesa-11-20.2.4
> 
> At least this time it redoes the build instead of just returning the same
> store items, but I still see the GCC 7.5.0 processes during the build:
> 
> $ pgrep -u guixbuilder01 -a -f cc1
> 127514 /gnu/store/…-gcc-7.5.0/libexec/gcc/i686-unknown-linux-gnu/7.5.0/cc1 […]
> 
> And again, linked with GCC 7.5.0 libraries:
> 
> $ ldd /gnu/store/l98bxwa5psb3yx56hhb78zr043s10p7q-mesa-11-20.2.4/lib/libOSMesa.so.8.0.0 | grep gcc
>         libstdc++.so.6 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libstdc++.so.6 (0xf51e4000)
>         libgcc_s.so.1 => /gnu/store/1527570cy2g7ld4wppmh3skvi27kvm43-gcc-7.5.0-lib/lib/libgcc_s.so.1 (0xf50c4000)
> 
> -- 
> Thanks,
> Thiago
> 
> 
> 
> 

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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