Drop support for Windows 8

Microsoft caused some very gentle breakages for Cosmopolitan. They
removed the version information from the PEB which caused uname to
report WINDOWS 0.0.0. We should have called GetVersionExW but that
doesn't really exist anymore either. Windows policy is now to give
whatever version we used in ape/ape.S. Windows8 has been EOL since
2023-01-10 so lets avoid our modern executables being relegated to
legacy infrastructure. Requiring Windows 10+ going forward lets us
remove runtime compatibility bloat from the codebase. Further note
Cosmopolitan maintains a Windows Vista branch on GitHub, so anyone
preferring the older versions, can still have a future with Cosmo.

Another neat thing this fixes is UTF-8 support in the console. The
changes Microsoft made broke the if statement that enabled UTF8 in
terminals. This explains why bug reports had broken arrows. In the
future this should be less of an issue, since the PEB code is gone
which means we more strictly conform to only Microsoft's WIN32 API

Author: jart

ape/ape.S

@@ -1036,7 +1036,7 @@ ape_pe:	.ascin	"PE",4
 	.quad	ape_pe_base		// ImageBase
 	.long	ape_pe_sectionalignment	// SectionAlignment
 	.long	ape_pe_filealignment	// FileAlignment
-	.short	v_ntversion		// MajorOperatingSystemVersion
+	.short	10			// MajorOperatingSystemVersion
 	.short	0			// MinorOperatingSystemVersion
 	.short	0			// MajorImageVersion
 	.short	0			// MinorImageVersion

ape/ape.lds

@@ -715,7 +715,6 @@ ape_idataz = LINK_WINDOWS ? RVA(ape_idata_iat) : 0;
 ape_idata_iatsize = LINK_WINDOWS ? ape_idata_iatend - ape_idata_iat : 0;
 ape_idata = LINK_WINDOWS ? RVA(ape_idata_idt) : 0;
 ape_idata_idtsize = LINK_WINDOWS ? ape_idata_idtend - ape_idata_idt : 0;
-v_ntversion = LINK_WINDOWS ? 6 : 1;
 v_ntdllchar = LINK_WINDOWS ? 288 : 0;
 v_ntsubversion = LINK_WINDOWS ? 6 : 5;
 v_ntsubsystem = (LINK_WINDOWS

libc/calls/reboot.c

@@ -19,7 +19,6 @@
 #include "libc/calls/calls.h"
 #include "libc/calls/struct/framebuffervirtualscreeninfo.h"
 #include "libc/dce.h"
-#include "libc/nt/enum/version.h"
 #include "libc/nt/system.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/errfuns.h"
@@ -72,9 +71,7 @@ int reboot(int howto) {
       } else {
         howto |= kNtShutdownForceSelf;
         howto |= kNtShutdownForceOthers;
-        if (NtGetVersion() >= kNtVersionWindows8) {
-          howto |= kNtShutdownHybrid;
-        }
+        howto |= kNtShutdownHybrid;
         if (immediately) {
           ok = !!InitiateShutdown(0, 0, 0, howto | kNtShutdownGraceOverride, 0);
         } else {

libc/calls/tcsetattr-nt.c

@@ -25,7 +25,6 @@
 #include "libc/intrin/nomultics.internal.h"
 #include "libc/nt/console.h"
 #include "libc/nt/enum/consolemodeflags.h"
-#include "libc/nt/version.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/baud.internal.h"
 #include "libc/sysv/consts/termios.h"
@@ -96,9 +95,7 @@ textwindows int tcsetattr_nt(int fd, int opt, const struct termios *tio) {
   if (!(tio->c_oflag & ONLCR)) {
     outmode |= kNtDisableNewlineAutoReturn;
   }
-  if (IsAtLeastWindows10()) {
-    outmode |= kNtEnableVirtualTerminalProcessing;
-  }
+  outmode |= kNtEnableVirtualTerminalProcessing;
 
   // tune the win32 configuration
   unassert(SetConsoleMode(hInput, inmode));

libc/calls/uname.c

@@ -30,7 +30,6 @@
 #include "libc/log/log.h"
 #include "libc/macros.internal.h"
 #include "libc/nt/enum/computernameformat.h"
-#include "libc/nt/struct/teb.h"
 #include "libc/nt/systeminfo.h"
 #include "libc/runtime/runtime.h"
 #include "libc/str/str.h"
@@ -81,34 +80,13 @@ static textwindows void GetNtName(char *name, int kind) {
   }
 }
 
-static inline textwindows int GetNtMajorVersion(void) {
-#ifdef __x86_64__
-  return NtGetPeb()->OSMajorVersion;
-#else
-  return 0;
-#endif
-}
-
-static inline textwindows int GetNtMinorVersion(void) {
-#ifdef __x86_64__
-  return NtGetPeb()->OSMinorVersion;
-#else
-  return 0;
-#endif
-}
-
-static inline textwindows int GetNtBuildNumber(void) {
-#ifdef __x86_64__
-  return NtGetPeb()->OSBuildNumber;
-#else
-  return 0;
-#endif
-}
-
 static textwindows void GetNtVersion(char *p) {
-  p = FormatUint32(p, GetNtMajorVersion()), *p++ = '.';
-  p = FormatUint32(p, GetNtMinorVersion()), *p++ = '-';
-  p = FormatUint32(p, GetNtBuildNumber());
+  // We could ask GetVersionExW() for this information, but it'll simply
+  // report what we put in the MajorOperatingSystemVersion of the PE ape
+  // header fields. Windows doesn't want us detecting versions it seems.
+  // Chances are they bake all old versions of Windows into Windows, and
+  // run us on the intended one, like some kind of Docker container. Heh
+  strcpy(p, "10.0");
 }
 
 static const char *Str(int rc, const char *s) {

libc/intrin/asan.c

@@ -39,7 +39,6 @@
 #include "libc/mem/mem.h"
 #include "libc/nexgen32e/gc.internal.h"
 #include "libc/nexgen32e/stackframe.h"
-#include "libc/nt/enum/version.h"
 #include "libc/runtime/memtrack.internal.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/stack.h"
@@ -1500,10 +1499,6 @@ void __asan_init(int argc, char **argv, char **envp, unsigned long *auxv) {
   static bool once;
   if (!_cmpxchg(&once, false, true))
     return;
-  if (IsWindows() && NtGetVersion() < kNtVersionWindows10) {
-    __write_str("error: asan binaries require windows10\r\n");
-    _Exit(0); /* So `make MODE=dbg test` passes w/ Windows7 */
-  }
   if (_weaken(hook_malloc) || _weaken(hook_calloc) || _weaken(hook_realloc) ||
       _weaken(hook_realloc_in_place) || _weaken(hook_free) ||
       _weaken(hook_malloc_usable_size)) {

libc/intrin/isatleastwindows10.c

@@ -24,22 +24,13 @@
 #include "libc/intrin/promises.internal.h"
 #include "libc/log/libfatal.internal.h"
 #include "libc/log/log.h"
-#include "libc/nt/struct/teb.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/consts/at.h"
 #include "libc/sysv/consts/o.h"
 
 #define kBufSize 1024
 #define kPid     "TracerPid:\t"
 
-static textwindows bool IsBeingDebugged(void) {
-#ifdef __x86_64__
-  return !!NtGetPeb()->BeingDebugged;
-#else
-  return false;
-#endif
-}
-
 /**
  * Determines if gdb, strace, windbg, etc. is controlling process.
  * @return non-zero if attached, otherwise 0
@@ -54,7 +45,7 @@ bool32 IsDebuggerPresent(bool32 force) {
   if (!force && environ && __getenv(environ, "HEISENDEBUG").s)
     return 0;
   if (IsWindows())
-    return IsBeingDebugged();
+    return false;  // make virus scanners happy
   if (__isworker)
     return false;
   if (!PLEDGED(RPATH))

libc/intrin/isdebuggerpresent.c

@@ -18,7 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/dce.h"
 #include "libc/log/internal.h"
-#include "libc/nt/version.h"
 #include "libc/runtime/runtime.h"
 
 #define IsDumb(s) \
@@ -51,6 +50,5 @@ bool __nocolor;
 __attribute__((__constructor__(20))) optimizesize textstartup void
 __nocolor_init(int argc, char **argv, char **envp, intptr_t *auxv) {
   char *s;
-  __nocolor = (IsWindows() && !IsAtLeastWindows10()) ||
-              ((s = getenv("TERM")) && IsDumb(s));
+  __nocolor = IsWindows() || ((s = getenv("TERM")) && IsDumb(s));
 }