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/integral/c.inc

@@ -156,7 +156,7 @@ typedef struct {
 #define memcpyesque libcesque
 #define strlenesque libcesque nosideeffect paramsnonnull()
 #define vallocesque \
-  libcesque dontdiscard returnsaligned((65536)) returnspointerwithnoaliases
+  libcesque __wur returnsaligned((65536)) returnspointerwithnoaliases
 #define reallocesque libcesque returnsaligned((16))
 #define mallocesque  reallocesque returnspointerwithnoaliases
 #define interruptfn  nocallersavedregisters forcealignargpointer
@@ -268,13 +268,13 @@ typedef struct {
 #endif /* __cplusplus */
 #endif /* forceinline */
 
-#ifndef dontdiscard
+#ifndef __wur
 #if !defined(__STRICT_ANSI__) &&                           \
     ((__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 304 || \
      __has_attribute(__warn_unused_result__))
-#define dontdiscard __attribute__((__warn_unused_result__))
+#define __wur __attribute__((__warn_unused_result__))
 #else
-#define dontdiscard
+#define __wur
 #endif
 #endif