new(gnu.org/gcc/v8): GCC 8 for legacy C++ projects#13070
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Many projects vendoring older C++ libraries (RocksDB 6.3.x in cubefs, InnoDB in MySQL 5.7, pre-C++17 codebases) hit gcc 12+'s stricter copy-ctor / atomic / std::pair-construction rules. They compile cleanly with gcc 8 (last default-C++14 major) but couldn't build in pantry without a 8.x bottle — pkgx CLI returns "ResolveError" on `gnu.org/gcc^8`. This recipe is a thin pin to the 8.x line, parallel to the main gnu.org/gcc recipe. Linux only — darwin's old-SDK situation makes gcc 8 hard to bring up there, and llvm.org clang covers legacy on darwin anyway. Enables follow-up: cubefs.io (pkgxdev#13050) and mysql.com/v5_7 (pkgxdev#13062) can pin `gnu.org/gcc/v8: '*'` to compile their vendored old C++.
This was referenced May 29, 2026
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May 31, 2026
mysql.com/v5_7 build-depends on gnu.org/gcc/v8 (linux only) for the InnoDB pre-C++17 idioms. The v8 recipe lives on a separate open PR; merging it here so CI can resolve the dep and bottle this PR. If pkgxdev#13070 lands first, this merge is a no-op.
tannevaled
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Two related fixes after seeing CI fail with "pkg not found: gnu.org/gcc/v8" on darwin/aarch64 (29s, before any compile): 1. **gcc/v8 is linux-only**. The companion PR pkgxdev#13070 ships gnu.org/gcc/v8 with `platforms: [linux/x86-64, linux/aarch64]` only. The previous recipe declared it as a top-level build dep, which pkg resolver tried to satisfy on every platform — hence the not-found on darwin. Move the pin under `linux:`. On darwin we follow homebrew's mysql@5.7 lead (the deprecated formula at homebrew-core@44d961a18 — last 5.7.43 commit before deletion): no gcc pin, the system clang compiles 5.7's vendored InnoDB fine. 2. **Runtime libstdcxx pin**. Same lesson as the main mysql recipe in PR pkgxdev#13104: pantry doesn't auto-propagate stdenv.cc.cc.lib into RUNPATH the way nixpkgs does, so the runtime libstdc++.so.6 must be declared explicitly. gcc 8 emits GLIBCXX_3.4.25-ish symver references, which the forward- compatible libstdcxx ^14 satisfies (older symver references resolve against newer libstdc++). 3. **Drop -DCMAKE_CXX_STANDARD=17**. Pinning gcc 8 is precisely to accommodate 5.7's pre-C++17 vendored InnoDB; forcing C++17 on top defeats the point. homebrew's mysql@5.7 doesn't set CXX_STANDARD at all — gcc 8's default (gnu++14) is correct. Also merged the gnu.org/gcc/v8 recipe from pkgxdev#13070 into this branch so CI can resolve the dep without waiting for that PR to land.
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Summary
Why
`pkgx +gnu.org/gcc^8` currently returns `ResolveError` — no 8.x bottle exists. This PR adds the recipe so pantry CI builds and bottles gcc 8 for downstream legacy recipes.
Test plan
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