build: freebsd/riscv64 port is broken

[dmitshur]

The Go porting policy has a section on broken ports, https://go.dev/wiki/PortingPolicy#broken-ports. The GOOS=freebsd GOARCH=riscv64 port was marked broken in August 2025 (CL 691835), with the following issues being relevant:

• The port stopped building with cgo, failing to build archive/tar package during all.bash. Tracked in the following issue:
  • riscv64: can't build on FreeBSD with cgo #73516 (Resolved by now.)
• cmd/compile,runtime: nosplit stack over 800 byte limit on freebsd/riscv64 #76062 (Resolved by now.)
• There was no builders running, tracked in the following issue:
  • x/build: gotip-freebsd-riscv64 builder is missing #73568 (A builder was added and is running by now, but not yet passing all.bash in the main repo.)

This is an umbrella issue to track the status of the port.

CC @golang/freebsd, @golang/riscv64, @golang/release.

[gopherbot]

Change https://go.dev/cl/724860 mentions this issue: doc/next: document broken freebsd/riscv64 port

[gabyhelp]

Related Issues

• all: add freebsd/riscv64 port #53466 (closed)
• riscv64: can't build on FreeBSD with cgo [1.24 backport] #74735 (closed)
• x/build: gotip-freebsd-riscv64 builder is missing #73568
• all: port to RISC-V #27532 (closed)
• all: add openbsd/riscv64 port #55999 (closed)
• riscv64: can't build on FreeBSD with cgo [1.23 backport] #74734 (closed)
• all: future of the openbsd/mips64 port #61546
• x/build/internal/releasetargets: distribute official binaries for linux/riscv64 #52644 (closed)
• x/build: add FreeBSD/arm64 builder #35058 (closed)

Related Code Changes

• cmd/dist, internal/platform: mark freebsd/riscv64 broken

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