build, util: Prevent execution for Windows versions less than Windows 7

configure.ac

@@ -413,7 +413,7 @@ case $host in
        AC_MSG_ERROR("windres not found")
      fi
 
-     CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB"
+     CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -D_WIN32_WINNT=0x0601"
      LEVELDB_TARGET_FLAGS="-DOS_WINDOWS"
      if test "x$CXXFLAGS_overridden" = "xno"; then
        CXXFLAGS="$CXXFLAGS -w"
@@ -433,6 +433,8 @@ case $host in
      archive_cmds_CXX="\$CC -shared \$libobjs \$deplibs \$compiler_flags -static -o \$output_objdir/\$soname \${wl}--enable-auto-image-base -Xlinker --out-implib -Xlinker \$lib"
      postdeps_CXX=
 
+     dnl We require Windows 7 (NT 6.1) or later
+     AX_CHECK_LINK_FLAG([[-Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1]],[LDFLAGS="$LDFLAGS -Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1"],,[[$LDFLAG_WERROR]])
      ;;
   *darwin*)
      TARGET_OS=darwin

src/compat.h

@@ -16,10 +16,6 @@
 #endif
 
 #ifdef WIN32
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0501
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
 #endif

src/init.cpp

@@ -738,17 +738,8 @@ bool AppInit2(ThreadHandlerPtr threads)
     _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
 #endif
 #ifdef WIN32
-    // Enable Data Execution Prevention (DEP)
-    // Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
-    // A failure is non-critical and needs no further attention!
-#ifndef PROCESS_DEP_ENABLE
-// We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
-// which is not correct. Can be removed, when GCCs winbase.h is fixed!
-#define PROCESS_DEP_ENABLE 0x00000001
-#endif
-    typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
-    PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
-    if (setProcDEPPol != nullptr) setProcDEPPol(PROCESS_DEP_ENABLE);
+    // Enable heap terminate-on-corruption
+    HeapSetInformation(nullptr, HeapEnableTerminationOnCorruption, nullptr, 0);
 #endif
 #ifndef WIN32
     umask(077);

src/netbase.cpp

@@ -56,11 +56,8 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign
     aiHint.ai_socktype = SOCK_STREAM;
     aiHint.ai_protocol = IPPROTO_TCP;
     aiHint.ai_family = AF_UNSPEC;
-#ifdef WIN32
-    aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
-#else
     aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
-#endif
+
     struct addrinfo* aiRes = nullptr;
     int nErr = getaddrinfo(pszName, nullptr, &aiHint, &aiRes);
     if (nErr)

src/qt/guiutil.cpp

@@ -21,10 +21,6 @@
 #include <QThread>
 
 #ifdef WIN32
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0501
 #ifdef _WIN32_IE
 #undef _WIN32_IE
 #endif

src/util/system.cpp

@@ -24,10 +24,6 @@
 #pragma warning(disable:4805)
 #pragma warning(disable:4717)
 #endif
-#ifdef _WIN32_WINNT
-#undef _WIN32_WINNT
-#endif
-#define _WIN32_WINNT 0x0501
 #ifdef _WIN32_IE
 #undef _WIN32_IE
 #endif