Make improvements

- Fix unused local variable errors
- Remove yoinks from sigaction() header
- Add nox87 and aarch64 to github actions
- Fix cosmocc -fportcosmo in linking mode
- It's now possible to build `make m=llvm o/llvm/libc`

libc/runtime/clone.c

@@ -169,7 +169,7 @@ asm("XnuThreadThunk:\n\t"
     "push\t%rax\n\t"
     "jmp\tXnuThreadMain\n\t"
     ".size\tXnuThreadThunk,.-XnuThreadThunk");
-__attribute__((__used__, __no_reorder__))
+__attribute__((__used__))
 
 static wontreturn void
 XnuThreadMain(void *pthread,                    // rdi

libc/runtime/enable_tls.c

@@ -121,7 +121,7 @@ textstartup void __enable_tls(void) {
 
 #ifdef __x86_64__
 
-  siz = ROUNDUP(I(_tls_size) + sizeof(*tib), _Alignof(__static_tls));
+  siz = ROUNDUP(I(_tls_size) + sizeof(*tib), TLS_ALIGNMENT);
   if (siz <= sizeof(__static_tls)) {
     // if tls requirement is small then use the static tls block
     // which helps avoid a system call for appes with little tls

libc/runtime/ftrace-hook.S

@@ -26,7 +26,7 @@ ftrace_hook:
 //	like __errno_location which can be called from an inline asm()
 //	statement. It's nice to have the flexibility anyway.
 
-	cmp	$0,__ftrace(%rip)
+	cmpl	$0,__ftrace(%rip)
 	jle	1f
 	push	%rbp
 	mov	%rsp,%rbp

libc/runtime/inflate.c

@@ -54,8 +54,6 @@ int __inflate(void *out, size_t outsize, const void *in, size_t insize) {
       rc = 0;
     } else if (rc == Z_OK) {
       rc = Z_STREAM_END;  // coerce to nonzero
-    } else {
-      rc = rc;
     }
   } else {
     rc = _puff(out, &outsize, in, &insize);

libc/runtime/memtracknt.c

@@ -31,13 +31,9 @@ static inline noasan void *GetFrameAddr(int f) {
 }
 
 noasan void ReleaseMemoryNt(struct MemoryIntervals *mm, int l, int r) {
-  int i, ok;
-  size_t size;
-  char *addr, *last;
+  int i;
   for (i = l; i <= r; ++i) {
-    addr = GetFrameAddr(mm->p[i].x);
-    last = GetFrameAddr(mm->p[i].y);
-    UnmapViewOfFile(addr);
+    UnmapViewOfFile(GetFrameAddr(mm->p[i].x));
     CloseHandle(mm->p[i].h);
   }
 }

libc/runtime/runtime.mk

@@ -128,7 +128,8 @@ o/$(MODE)/libc/runtime/enable_threads.o			\
 o/$(MODE)/libc/runtime/morph_tls.o: private		\
 		CFLAGS +=				\
 			-ffreestanding			\
-			-fno-sanitize=all
+			-fno-sanitize=all		\
+			-fno-stack-protector
 
 # TODO(jart): We need a way to avoid WinThreadEntry() being hooked.
 o/$(MODE)/libc/runtime/clone.o: private			\

libc/runtime/stackchkfail.c

@@ -1,26 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/calls/calls.h"
-#include "libc/runtime/internal.h"
-#include "libc/runtime/runtime.h"
-
-__attribute__((__weak__)) void __stack_chk_fail(void) {
-  tinyprint(2, program_invocation_name, ": stack smashed\n", NULL);
-  __builtin_trap();
-}

libc/runtime/stackchkfaillocal.c

@@ -1,23 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/runtime/internal.h"
-
-__attribute__((__weak__)) void __stack_chk_fail_local(void) {
-  __stack_chk_fail();
-}

libc/runtime/winmain.greg.c

@@ -154,6 +154,7 @@ __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) {
                 : (DescribeNtConsoleInFlags)(inflagsbuf, kConsoleModes[i]),
               rc);
     }
+    (void)rc;
   }
   _Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, "");
   _mmi.p = _mmi.s;