bug#40071: Cross-compiled package closure size.

[Mathieu Othacehe]

Hello,

After applying the patch proposed here[1], the closure of cross-compiled
"hello" still contains unwanted packages.

--8<---------------cut here---------------start------------->8---
mathieu@elbruz ~/guix [env]$ guix size 
/gnu/store/14ygibryjr7mcly0q9mb8306hlg16nhq-hello-2.10
store item                                                       total    self
/gnu/store/vm2gaw5jk1zr1x9qzj4z52qjxvrh0nk9-glibc-cross-aarch64-linux-gnu-2.31  
 158.9    71.4  38.2%
/gnu/store/w00jb174abikqpznadwzvvgwl3r7qfzd-glibc-2.31              38.4    
36.7  19.6%
/gnu/store/08vqg0s77dnff7rz90b0h87n2rfyaszg-gcc-7.5.0-lib           71.0    
32.6  17.5%
/gnu/store/vqsixs9ks4chpjynhizkpdd1gdshv87h-gcc-cross-aarch64-linux-gnu-7.5.0-lib
   186.8    27.9  14.9%
/gnu/store/fgrpk8r46k34pyqv6xkbi8gbv997dbpx-gcc-cross-sans-libc-aarch64-linux-gnu-7.5.0-lib
    80.8     9.8   5.2%
/gnu/store/zf5603c5l6ilgyg35gqfkn82v3k9hbri-linux-libre-headers-cross-aarch64-linux-gnu-5.4.20
     5.1     5.1   2.7%
/gnu/store/6hhsxa3vvbh8gvcfjw4k5sfk1qrhkcrf-bash-static-5.0.16       1.6     
1.6   0.9%
/gnu/store/nvc3r588745kkj159lm1pa4xz5g99rqd-bash-static-5.0.16       1.6     
1.6   0.9%
/gnu/store/14ygibryjr7mcly0q9mb8306hlg16nhq-hello-2.10             187.0     
0.2   0.1%
--8<---------------cut here---------------end--------------->8---

The native glibc, gcc-lib and one of the two bash-static packages should
be removed.

The gcc-cross-sans-libc-aarch64-linux-gnu-7.5.0-lib may also be removed.

Ideally, we would have a closure similar to the native one, with
something like this:

--8<---------------cut here---------------start------------->8---
/gnu/store/vm2gaw5jk1zr1x9qzj4z52qjxvrh0nk9-glibc-cross-aarch64-linux-gnu-2.31  
 158.9    71.4  38.2%
/gnu/store/vqsixs9ks4chpjynhizkpdd1gdshv87h-gcc-cross-aarch64-linux-gnu-7.5.0-lib
   186.8    27.9  14.9%
/gnu/store/6hhsxa3vvbh8gvcfjw4k5sfk1qrhkcrf-bash-static-5.0.16       1.6     
1.6   0.9%
/gnu/store/14ygibryjr7mcly0q9mb8306hlg16nhq-hello-2.10             187.0     
0.2   0.1%
--8<---------------cut here---------------end--------------->8---

Thanks,

Mathieu

[1]: https://lists.gnu.org/archive/html/bug-guix/2020-03/msg00170.html