Make improvements

- Invent openatemp() API
- Invent O_UNLINK open flag
- Introduce getenv_secure() API
- Remove `git pull` from cosmocc
- Fix utimes() when path is NULL
- Fix mktemp() to never return NULL
- Fix utimensat() UTIME_OMIT on XNU
- Improve utimensat() code for RHEL5
- Turn `argv[0]` C:/ to /C/ on Windows
- Introduce tmpnam() and tmpnam_r() APIs
- Fix more const issues with internal APIs
- Permit utimes() on WIN32 in O_RDONLY mode
- Fix fdopendir() to check fd is a directory
- Fix recent crash regression in landlock make
- Fix futimens(AT_FDCWD, NULL) to return EBADF
- Use workaround so `make -j` doesn't fork bomb
- Rename dontdiscard to __wur (just like glibc)
- Fix st_size for WIN32 symlinks containing UTF-8
- Introduce stdio ext APIs needed by GNU coreutils
- Fix lstat() on WIN32 for symlinks to directories
- Move some constants from normalize.inc to limits.h
- Fix segv with memchr() and memcmp() overlapping page
- Implement POSIX fflush() behavior for reader streams
- Implement AT_SYMLINK_NOFOLLOW for utimensat() on WIN32
- Don't change read-only status of existing files on WIN32
- Correctly handle `0x[^[:xdigit:]]` case in strtol() functions

libc/intrin/ubsan.c

@@ -22,6 +22,7 @@
 #include "libc/intrin/pushpop.internal.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
+#include "libc/limits.h"
 #include "libc/log/color.internal.h"
 #include "libc/log/internal.h"
 #include "libc/log/libfatal.internal.h"
@@ -218,7 +219,7 @@ static char *__ubsan_stpcpy(char *d, const char *s) {
   }
 }
 
-dontdiscard static __ubsan_die_f *__ubsan_die(void) {
+__wur static __ubsan_die_f *__ubsan_die(void) {
   if (_weaken(__die)) {
     return _weaken(__die);
   } else {
@@ -232,8 +233,8 @@ static void __ubsan_warning(const struct UbsanSourceLocation *loc,
           loc->line, SUBTLE, description, RESET);
 }
 
-dontdiscard __ubsan_die_f *__ubsan_abort(const struct UbsanSourceLocation *loc,
-                                         const char *description) {
+__wur __ubsan_die_f *__ubsan_abort(const struct UbsanSourceLocation *loc,
+                                   const char *description) {
   kprintf("\n%s:%d: %subsan error%s: %s (tid %d)\n", loc->file, loc->line, RED2,
           RESET, description, gettid());
   return __ubsan_die();