internal/fakecgo: use libthr.so.3 instead of libpthread.so on FreeBSD (#481)

FreeBSD 15 removed the libpthread.so compatibility symlink to libthr.so
from base. This caused Go binaries built with CGO_ENABLED=0 using
purego's FreeBSD fakecgo path to have an unresolvable NEEDED entry for
libpthread.so.

libthr.so.3 is FreeBSD's actual threading implementation and has been
present since at least FreeBSD 12.x. Updated gen.go and regenerated
zsymbols_freebsd.go accordingly.

Tested on FreeBSD 15.1-STABLE amd64: examples/libc builds and runs
correctly with CGO_ENABLED=0, and readelf confirms the binary now links
against libthr.so.3 instead of libpthread.so.

Closes #480

commit: 501ed944ffd862e7434dbe6603cce3a92e26dbb3
author: rcina · 3mo ago · 2026-07-18 13:34 UTC
committer: Hajime Hoshi · 3mo ago · 2026-07-18 13:35 UTC
parent: eaff005
signature: unsigned

2 files · +11 -11

M internal/fakecgo/gen.go +1 -1


@@ -258,7 +258,7 @@ func run() error {
258	258		pthreadSO = "/usr/lib/libSystem.B.dylib"
259	259		case "freebsd":
260	260		libcSO = "libc.so.7"
261		-	pthreadSO = "libpthread.so"
	261	+	pthreadSO = "libthr.so.3"
262	262		case "linux":
263	263		libcSO = "libc.so.6"
264	264		pthreadSO = "libpthread.so.0"


@@ -258,7 +258,7 @@ func run() error {
258		pthreadSO = "/usr/lib/libSystem.B.dylib"	258		pthreadSO = "/usr/lib/libSystem.B.dylib"
259		case "freebsd":	259		case "freebsd":
260		libcSO = "libc.so.7"	260		libcSO = "libc.so.7"
261	-	pthreadSO = "libpthread.so"	261	+	pthreadSO = "libthr.so.3"
262		case "linux":	262		case "linux":
263		libcSO = "libc.so.6"	263		libcSO = "libc.so.6"
264		pthreadSO = "libpthread.so.0"	264		pthreadSO = "libpthread.so.0"

M internal/fakecgo/zsymbols_freebsd.go +10 -10


@@ -16,16 +16,16 @@ import "unsafe"
16	16		//go:cgo_import_dynamic purego_sigfillset sigfillset "libc.so.7"
17	17		//go:cgo_import_dynamic purego_nanosleep nanosleep "libc.so.7"
18	18		//go:cgo_import_dynamic purego_abort abort "libc.so.7"
19		-	//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libpthread.so"
20		-	//go:cgo_import_dynamic purego_pthread_create pthread_create "libpthread.so"
21		-	//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libpthread.so"
22		-	//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libpthread.so"
23		-	//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libpthread.so"
24		-	//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libpthread.so"
25		-	//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libpthread.so"
26		-	//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libpthread.so"
27		-	//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libpthread.so"
28		-	//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libpthread.so"
	19	+	//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libthr.so.3"
	20	+	//go:cgo_import_dynamic purego_pthread_create pthread_create "libthr.so.3"
	21	+	//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libthr.so.3"
	22	+	//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libthr.so.3"
	23	+	//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libthr.so.3"
	24	+	//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libthr.so.3"
	25	+	//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libthr.so.3"
	26	+	//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libthr.so.3"
	27	+	//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libthr.so.3"
	28	+	//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libthr.so.3"
29	29
30	30		//go:nosplit
31	31		//go:norace


@@ -16,16 +16,16 @@ import "unsafe"
16		//go:cgo_import_dynamic purego_sigfillset sigfillset "libc.so.7"	16		//go:cgo_import_dynamic purego_sigfillset sigfillset "libc.so.7"
17		//go:cgo_import_dynamic purego_nanosleep nanosleep "libc.so.7"	17		//go:cgo_import_dynamic purego_nanosleep nanosleep "libc.so.7"
18		//go:cgo_import_dynamic purego_abort abort "libc.so.7"	18		//go:cgo_import_dynamic purego_abort abort "libc.so.7"
19	-	//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libpthread.so"	19	+	//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libthr.so.3"
20	-	//go:cgo_import_dynamic purego_pthread_create pthread_create "libpthread.so"	20	+	//go:cgo_import_dynamic purego_pthread_create pthread_create "libthr.so.3"
21	-	//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libpthread.so"	21	+	//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libthr.so.3"
22	-	//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libpthread.so"	22	+	//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libthr.so.3"
23	-	//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libpthread.so"	23	+	//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libthr.so.3"
24	-	//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libpthread.so"	24	+	//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libthr.so.3"
25	-	//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libpthread.so"	25	+	//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libthr.so.3"
26	-	//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libpthread.so"	26	+	//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libthr.so.3"
27	-	//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libpthread.so"	27	+	//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libthr.so.3"
28	-	//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libpthread.so"	28	+	//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libthr.so.3"
29			29
30		//go:nosplit	30		//go:nosplit
31		//go:norace	31		//go:norace