Comment 8 for bug 1899239

Removing "lang/sbcl/files/patch-src_runtime_x86-64-bsd-os.c" patch produced the error:

bsd-os.c:292:50: warning: incompatible function pointer types passing '__siginfohandler_t *' (aka 'void (*)(int, struct __siginfo *, void *)') to parameter of type 'interrupt_handler_t' (aka 'void (*)(int, struct __siginfo *, struc
t __ucontext *)') [-Wincompatible-function-pointer-types]
                                                 (__siginfohandler_t *)
                                                 ^~~~~~~~~~~~~~~~~~~~~~
./interrupt.h:124:64: note: passing argument to parameter 'handler' here
extern void ll_install_handler(int signal, interrupt_handler_t handler);
                                                               ^
1 warning generated.
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o x86-64-bsd-os.o x86-64-bsd-os.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o fullcgc.o fullcgc.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o gencgc.o gencgc.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o traceroot.o traceroot.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o immobile-space.o immobile-space.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o elf.o elf.c
cc -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -fno-omit-frame-pointer -I. -c -o x86-64-assem.o x86-64-assem.S
cc -g -Wl,--export-dynamic -o sbcl alloc.o backtrace.o breakpoint.o coalesce.o coreparse.o dynbind.o funcall.o gc-common.o globals.o hopscotch.o interr.o interrupt.o largefile.o main.o monitor.o murmur_hash.o os-common.o parse.o pr
int.o purify.o regnames.o runtime.o safepoint.o save.o sc-offset.o search.o thread.o time.o validate.o var-io.o vars.o wrap.o run-program.o x86-64-arch.o bsd-os.o x86-64-bsd-os.o fullcgc.o gencgc.o traceroot.o immobile-space.o elf.
o x86-64-assem.o -lutil -lthr -lm
ld: error: undefined symbol: arch_os_load_ldt
>>> referenced by thread.h:307 (./thread.h:307)
>>> alloc.o:(alloc_code_object)
>>> referenced by thread.h:307 (./thread.h:307)
>>> backtrace.o:(describe_thread_state)
>>> referenced by thread.h:307 (./thread.h:307)
>>> backtrace.o:(lisp_backtrace)
>>> referenced 62 more times
cc: error: linker command failed with exit code 1 (use -v to see invocation)