John Ericson be82056397 gcc/ng: cope with a source tree that is a VCS checkout ...

A release tarball carries generated files that a git tree does not, and
two of those bit us.

`MD5SUMS` is generated when a tarball is rolled. Each sub-source
extractor asserted `[[ -f MD5SUMS ]]` before copying it, so every one of
them failed outright the moment `monorepoSrc` was a git tree:

    unpacking source archive /nix/store/...-source
    source root is source
    <exit 1>

Copy it only when it is there.

The generated sources are the other half: a checkout lacks
`gengtype-lex.cc` and friends, which a tarball ships pre-built, so they
have to be regenerated. Take flex and bison as native inputs when
`fromVCS` says the source is a checkout.

Tarball builds are unaffected either way.

Assisted-by: Claude Code (Claude Opus 5)

2026-08-12 16:58:43 -04:00

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default.nix

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