40 lines
1.7 KiB
Nix
40 lines
1.7 KiB
Nix
{ lib, stdenv, nukeReferences, langC, langCC, runtimeShell }:
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let
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enableChecksum = (with stdenv;
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buildPlatform == hostPlatform && hostPlatform == targetPlatform) && langC
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&& langCC && !stdenv.hostPlatform.isDarwin;
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in (pkg:
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pkg.overrideAttrs (previousAttrs:
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lib.optionalAttrs enableChecksum {
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outputs = previousAttrs.outputs
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++ lib.optionals enableChecksum [ "checksum" ];
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# This is a separate phase because gcc assembles its phase scripts
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# in bash instead of nix (we should fix that).
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preFixupPhases = (previousAttrs.preFixupPhases or [ ])
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++ [ "postInstallSaveChecksumPhase" ];
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#
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# gcc uses an auxiliary utility `genchecksum` to md5-hash (most of) its
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# `.o` and `.a` files prior to linking (in case the linker is
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# nondeterministic). Since we want to compare across gccs built from two
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# separate derivations, we wrap `genchecksum` with a `nuke-references`
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# call. We also stash copies of the inputs to `genchecksum` in
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# `$checksum/inputs/` -- this is extremely helpful for debugging since
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# it's hard to get Nix to not delete the $NIX_BUILD_TOP of a successful
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# build.
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#
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postInstallSaveChecksumPhase = ''
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mv gcc/build/genchecksum gcc/build/.genchecksum-wrapped
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cat > gcc/build/genchecksum <<\EOF
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#!${runtimeShell}
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${nukeReferences}/bin/nuke-refs $@
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for INPUT in "$@"; do install -Dt $INPUT $checksum/inputs/; done
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exec build/.genchecksum-wrapped $@
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EOF
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chmod +x gcc/build/genchecksum
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rm gcc/*-checksum.*
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make -C gcc cc1-checksum.o cc1plus-checksum.o
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install -Dt $checksum/checksums/ gcc/cc*-checksum.o
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'';
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}))
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