Michael Suchacz f8e8f979a2 chore(Makefile): use go build -o for helper binaries to reduce GOCACHE growth (#24197)
## Problem

`go run` caches the final linked executable in `~/.cache/go-build`.
Every
helper invocation via `go run ./scripts/<tool>` stores a copy, and
because
the cache key includes build metadata, the same tool accumulates
multiple
cached executables over time. With 12+ helper binaries invoked during
`make gen` and `make pre-commit`, this is a meaningful contributor to
GOCACHE growth.

## Fix

Replace `go run` with `go build -o _gen/bin/<tool>` for 12 repo-local
helper packages (16 Makefile callsites). Each helper is an explicit Make
file target with `$(wildcard *.go)` prerequisites, so `make -j`
serializes
builds correctly instead of racing on shared output paths.

Helpers converted: `apitypings`, `auditdocgen`, `check-scopes`,
`clidocgen`, `dbdump`, `examplegen`, `gensite`, `apikeyscopesgen`,
`metricsdocgen`, `metricsdocgen-scanner`, `modeloptionsgen`, `typegen`.

Left on `go run` (intentionally): `migrate-ci` and `migrate-test`
(CI/test-only, not on common developer paths).

`_gen/` is already in `.gitignore`. The `clean` target removes
`_gen/bin`.

## GOCACHE growth (isolated cache, single `make gen`)

|  | Old (`go run`) | New (`go build -o`) |
|--|----------------|---------------------|
| Total cache size | 2.9 GB | 2.6 GB |
| Cached executables | 11 | 4 |
| Executable bytes | 401 MB | 25 MB |

The 4 remaining executables come from tools outside this change
(`dbgen` and `goimports` from `generate.sh`, plus two `main` binaries
from deferred helpers). Helper binaries now live in `_gen/bin/`
(581 MB, gitignored, cleaned by `make clean`).

## Build time benchmarks

**Source changed** (content hash invalidated, forces recompile):

| Helper | `go run` | `go build -o` + run | Overhead |
|--------|---------|---------------------|----------|
| typegen | 1.50s | 2.03s | +0.52s |
| examplegen | 1.37s | 1.67s | +0.30s |
| apikeyscopesgen | 1.21s | 1.71s | +0.50s |
| modeloptionsgen | 1.23s | 1.64s | +0.41s |

**Repeat invocation** (no source change, the common `make gen` / `make
pre-commit` path):

| Helper | `go run` (cache lookup) | Cached binary | Speedup |
|--------|------------------------|---------------|---------|
| typegen | 0.346s | 0.037s | 9.4x |
| examplegen | 0.368s | 0.037s | 9.9x |
| modeloptionsgen | 0.342s | 0.021s | 16.3x |
| apikeyscopesgen | 0.298s | 0.030s | 9.9x |

When source changes, `go build -o` is 0.3-0.5s slower per helper (it
writes a local binary instead of caching in GOCACHE). On repeat runs
(the common path), the pre-built binary is 10-16x faster because
`go run` still does a staleness check while the binary just executes.

> This PR was authored by Mux on behalf of Mike.
2026-04-09 16:04:06 +02:00

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