Hello! GHC is insanely large, 1.2G for its closure, most of which is itself:
--8<---------------cut here---------------start------------->8--- store item total self /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2 1209.7 860.5 71.1% /gnu/store/k6r37137lfpg3l3igi50c7lj2za7kqly-ld-wrapper-0 153.7 0.0 0.0% /gnu/store/czs63sm4l0s4a56ab38dqvkx19yzylbq-perl-5.16.1 141.2 49.2 4.1% /gnu/store/hddjjpkfvwaf1j1q3qwpvby0rid3k8by-gcc-4.9.3 138.1 77.3 6.4% /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc 120.2 42.6 3.5% /gnu/store/fmxxkrpwajcnb9cyncgh4f4z6ybknl1g-guile-2.0.11 109.0 16.1 1.3% /gnu/store/y5psndwpbbkjrf856x757psb708y62dn-binutils-2.25.1 82.5 44.6 3.7% /gnu/store/mnwjrkbfzkb5ifhqf8hssf3cxfvg11l6-coreutils-8.24 77.8 13.8 1.1% /gnu/store/fzp98iyq7a2i4d4siw0ab0y0wa95vv8k-readline-6.3 68.6 1.2 0.1% [...] $ du -ms /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/ 871 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/ $ du -ms /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/ 871 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/ --8<---------------cut here---------------end--------------->8--- The main problem is that, for each module, we have three variants: --8<---------------cut here---------------start------------->8--- $ du -ms /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/* 3 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/Control 1 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/Data 5 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/libHStransformers-0.4.2.0-3eG64VdP2vzGjP6wJiCp5X.a 2 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/libHStransformers-0.4.2.0-3eG64VdP2vzGjP6wJiCp5X-ghc7.10.2.so 7 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/trans_3eG64VdP2vzGjP6wJiCp5X/libHStransformers-0.4.2.0-3eG64VdP2vzGjP6wJiCp5X_p.a --8<---------------cut here---------------end--------------->8--- What about removing all the .a? Would that be OK? On that topic I found <https://ghc.haskell.org/trac/ghc/wiki/DynamicByDefault> but it’s not clear to me whether this is relevant here. At worst we can add a phase that removes these files. A secondary issue is documentation: There’s a “doc” output, but ‘ghc:out’ depends on ‘ghc:doc’: --8<---------------cut here---------------start------------->8--- $ guix gc --references /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/ | grep doc /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc $ du -ms /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc 47 /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc $ grep -r r539jrq7jk9vkmm1255i5jqs7skn4fag /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/package.conf.d/process-1.2.3.0-f0287ac288afc0705be775d1adda59ee.conf:haddock-interfaces: /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc/share/doc/ghc/html/libraries/process-1.2.3.0/process.haddock /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/package.conf.d/process-1.2.3.0-f0287ac288afc0705be775d1adda59ee.conf:haddock-html: /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc/share/doc/ghc/html/libraries/process-1.2.3.0 /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/package.conf.d/Cabal-1.22.4.0-43c3ae30d75ac742e521d26b63721876.conf:haddock-interfaces: /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc/share/doc/ghc/html/libraries/Cabal-1.22.4.0/Cabal.haddock /gnu/store/1iwl222h2qw80fyr578sdjdki0pbcjm0-ghc-7.10.2/lib/ghc-7.10.2/package.conf.d/Cabal-1.22.4.0-43c3ae30d75ac742e521d26b63721876.conf:haddock-html: /gnu/store/r539jrq7jk9vkmm1255i5jqs7skn4fag-ghc-7.10.2-doc/share/doc/ghc/html/libraries/Cabal-1.22.4.0 --8<---------------cut here---------------end--------------->8--- Any idea if we could avoid references to the “doc” output in these *.conf files? For instance, if there’s a variable like, say, ‘HADDOCK_PATH’, we can certainly remove the hardcoded references Federico, Paul, Eric, … thoughts? :-) Thanks, Ludo’.
